/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import * as ts from 'typescript';

import {absoluteFrom, getFileSystem, getSourceFileOrError} from '../../../src/ngtsc/file_system';
import {TestFile, runInEachFileSystem} from '../../../src/ngtsc/file_system/testing';
import {ClassMemberKind, CtorParameter, InlineDeclaration, isNamedClassDeclaration, isNamedFunctionDeclaration, isNamedVariableDeclaration} from '../../../src/ngtsc/reflection';
import {getDeclaration} from '../../../src/ngtsc/testing';
import {loadFakeCore, loadTestFiles} from '../../../test/helpers';
import {CommonJsReflectionHost} from '../../src/host/commonjs_host';
import {getIifeBody} from '../../src/host/esm5_host';
import {MockLogger} from '../helpers/mock_logger';
import {getRootFiles, makeTestBundleProgram, makeTestDtsBundleProgram} from '../helpers/utils';

import {expectTypeValueReferencesForParameters} from './util';

runInEachFileSystem(() => {
  describe('CommonJsReflectionHost', () => {

    let _: typeof absoluteFrom;

    let SOME_DIRECTIVE_FILE: TestFile;
    let TOPLEVEL_DECORATORS_FILE: TestFile;
    let CTOR_DECORATORS_ARRAY_FILE: TestFile;
    let SIMPLE_ES2015_CLASS_FILE: TestFile;
    let SIMPLE_CLASS_FILE: TestFile;
    let FOO_FUNCTION_FILE: TestFile;
    let INLINE_EXPORT_FILE: TestFile;
    let INVALID_DECORATORS_FILE: TestFile;
    let INVALID_DECORATOR_ARGS_FILE: TestFile;
    let INVALID_PROP_DECORATORS_FILE: TestFile;
    let INVALID_PROP_DECORATOR_ARGS_FILE: TestFile;
    let INVALID_CTOR_DECORATORS_FILE: TestFile;
    let INVALID_CTOR_DECORATOR_ARGS_FILE: TestFile;
    let IMPORTS_FILES: TestFile[];
    let EXPORTS_FILES: TestFile[];
    let FUNCTION_BODY_FILE: TestFile;
    let DECORATED_FILES: TestFile[];
    let TYPINGS_SRC_FILES: TestFile[];
    let TYPINGS_DTS_FILES: TestFile[];
    let MODULE_WITH_PROVIDERS_PROGRAM: TestFile[];

    beforeEach(() => {
      _ = absoluteFrom;

      SOME_DIRECTIVE_FILE = {
        name: _('/some_directive.cjs.js'),
        contents: `
var core = require('@angular/core');

var INJECTED_TOKEN = new InjectionToken('injected');
var ViewContainerRef = {};
var TemplateRef = {};

var SomeDirective = (function() {
  function SomeDirective(_viewContainer, _template, injected) {
    this.instanceProperty = 'instance';
  }
  SomeDirective.prototype = {
    instanceMethod: function() {},
  };
  SomeDirective.staticMethod = function() {};
  SomeDirective.staticProperty = 'static';
  SomeDirective.decorators = [
    { type: core.Directive, args: [{ selector: '[someDirective]' },] }
  ];
  SomeDirective.ctorParameters = function() { return [
    { type: ViewContainerRef, },
    { type: TemplateRef, },
    { type: undefined, decorators: [{ type: core.Inject, args: [INJECTED_TOKEN,] },] },
  ]; };
  SomeDirective.propDecorators = {
    "input1": [{ type: core.Input },],
    "input2": [{ type: core.Input },],
  };
  return SomeDirective;
}());
exports.SomeDirective = SomeDirective;
`
      };

      TOPLEVEL_DECORATORS_FILE = {
        name: _('/toplevel_decorators.cjs.js'),
        contents: `
var core = require('@angular/core');

var INJECTED_TOKEN = new InjectionToken('injected');
var ViewContainerRef = {};
var TemplateRef = {};

var SomeDirective = (function() {
  function SomeDirective(_viewContainer, _template, injected) {}
  return SomeDirective;
}());
SomeDirective.decorators = [
  { type: core.Directive, args: [{ selector: '[someDirective]' },] }
];
SomeDirective.ctorParameters = function() { return [
  { type: ViewContainerRef, },
  { type: TemplateRef, },
  { type: undefined, decorators: [{ type: core.Inject, args: [INJECTED_TOKEN,] },] },
]; };
SomeDirective.propDecorators = {
  "input1": [{ type: core.Input },],
  "input2": [{ type: core.Input },],
};
exports.SomeDirective = SomeDirective;
`
      };

      CTOR_DECORATORS_ARRAY_FILE = {
        name: _('/ctor_decorated_as_array.js'),
        contents: `
        var core = require('@angular/core');
        var CtorDecoratedAsArray = (function() {
        function CtorDecoratedAsArray(arg1) {
          }
          CtorDecoratedAsArray.ctorParameters = [{ type: ParamType, decorators: [{ type: Inject },] }];
          return CtorDecoratedAsArray;
        }());
        exports.SomeDirective = SomeDirective;
      `,
      };

      SIMPLE_ES2015_CLASS_FILE = {
        name: _('/simple_es2015_class.d.ts'),
        contents: `
    export class EmptyClass {}
  `,
      };

      SIMPLE_CLASS_FILE = {
        name: _('/simple_class.js'),
        contents: `
var EmptyClass = (function() {
  function EmptyClass() {
  }
  return EmptyClass;
}());
var NoDecoratorConstructorClass = (function() {
  function NoDecoratorConstructorClass(foo) {
  }
  return NoDecoratorConstructorClass;
}());
exports.EmptyClass = EmptyClass;
exports.NoDecoratorConstructorClass = NoDecoratorConstructorClass;
`,
      };

      FOO_FUNCTION_FILE = {
        name: _('/foo_function.js'),
        contents: `
var core = require('@angular/core');
function foo() {}
foo.decorators = [
  { type: core.Directive, args: [{ selector: '[ignored]' },] }
];
exports.foo = foo;
`,
      };

      INLINE_EXPORT_FILE = {
        name: _('/inline_export.js'),
        contents: `
var core = require('@angular/core');
function foo() {}
foo.decorators = [
  { type: core.Directive, args: [{ selector: '[ignored]' },] }
];
exports.directives = [foo];
`,
      };

      INVALID_DECORATORS_FILE = {
        name: _('/invalid_decorators.js'),
        contents: `
var core = require('@angular/core');
var NotArrayLiteral = (function() {
  function NotArrayLiteral() {
  }
  NotArrayLiteral.decorators = () => [
    { type: core.Directive, args: [{ selector: '[ignored]' },] },
  ];
  return NotArrayLiteral;
}());

var NotObjectLiteral = (function() {
  function NotObjectLiteral() {
  }
  NotObjectLiteral.decorators = [
    "This is not an object literal",
    { type: core.Directive },
  ];
  return NotObjectLiteral;
}());

var NoTypeProperty = (function() {
  function NoTypeProperty() {
  }
  NoTypeProperty.decorators = [
    { notType: core.Directive },
    { type: core.Directive },
  ];
  return NoTypeProperty;
}());

var NotIdentifier = (function() {
  function NotIdentifier() {
  }
  NotIdentifier.decorators = [
    { type: 'StringsLiteralsAreNotIdentifiers' },
    { type: core.Directive },
  ];
  return NotIdentifier;
}());
`,
      };

      INVALID_DECORATOR_ARGS_FILE = {
        name: _('/invalid_decorator_args.js'),
        contents: `
var core = require('@angular/core');
var NoArgsProperty = (function() {
  function NoArgsProperty() {
  }
  NoArgsProperty.decorators = [
    { type: core.Directive },
  ];
  return NoArgsProperty;
}());

var args = [{ selector: '[ignored]' },];
var NoPropertyAssignment = (function() {
  function NoPropertyAssignment() {
  }
  NoPropertyAssignment.decorators = [
    { type: core.Directive, args },
  ];
  return NoPropertyAssignment;
}());

var NotArrayLiteral = (function() {
  function NotArrayLiteral() {
  }
  NotArrayLiteral.decorators = [
    { type: core.Directive, args: () => [{ selector: '[ignored]' },] },
  ];
  return NotArrayLiteral;
}());
`,
      };

      INVALID_PROP_DECORATORS_FILE = {
        name: _('/invalid_prop_decorators.js'),
        contents: `
var core = require('@angular/core');
var NotObjectLiteral = (function() {
  function NotObjectLiteral() {
  }
  NotObjectLiteral.propDecorators = () => ({
    "prop": [{ type: core.Directive },]
  });
  return NotObjectLiteral;
}());

var NotObjectLiteralProp = (function() {
  function NotObjectLiteralProp() {
  }
  NotObjectLiteralProp.propDecorators = {
    "prop": [
      "This is not an object literal",
      { type: core.Directive },
    ]
  };
  return NotObjectLiteralProp;
}());

var NoTypeProperty = (function() {
  function NoTypeProperty() {
  }
  NoTypeProperty.propDecorators = {
    "prop": [
      { notType: core.Directive },
      { type: core.Directive },
    ]
  };
  return NoTypeProperty;
}());

var NotIdentifier = (function() {
  function NotIdentifier() {
  }
  NotIdentifier.propDecorators = {
    "prop": [
      { type: 'StringsLiteralsAreNotIdentifiers' },
      { type: core.Directive },
    ]
  };
  return NotIdentifier;
}());
`,
      };

      INVALID_PROP_DECORATOR_ARGS_FILE = {
        name: _('/invalid_prop_decorator_args.js'),
        contents: `
var core = require('@angular/core');
var NoArgsProperty = (function() {
  function NoArgsProperty() {
  }
  NoArgsProperty.propDecorators = {
    "prop": [{ type: core.Input },]
  };
  return NoArgsProperty;
}());

var args = [{ selector: '[ignored]' },];
var NoPropertyAssignment = (function() {
  function NoPropertyAssignment() {
  }
  NoPropertyAssignment.propDecorators = {
    "prop": [{ type: core.Input, args },]
  };
  return NoPropertyAssignment;
}());

var NotArrayLiteral = (function() {
  function NotArrayLiteral() {
  }
  NotArrayLiteral.propDecorators = {
    "prop": [{ type: core.Input, args: () => [{ selector: '[ignored]' },] },],
  };
  return NotArrayLiteral;
}());
`,
      };

      INVALID_CTOR_DECORATORS_FILE = {
        name: _('/invalid_ctor_decorators.js'),
        contents: `
var core = require('@angular/core');
var NoParameters = (function() {
  function NoParameters() {}
  return NoParameters;
}());

var ArrowFunction = (function() {
  function ArrowFunction(arg1) {
  }
  ArrowFunction.ctorParameters = () => [
    { type: 'ParamType', decorators: [{ type: core.Inject },] }
  ];
  return ArrowFunction;
}());

var NotArrayLiteral = (function() {
  function NotArrayLiteral(arg1) {
  }
  NotArrayLiteral.ctorParameters = function() { return 'StringsAreNotArrayLiterals'; };
  return NotArrayLiteral;
}());

var NotObjectLiteral = (function() {
  function NotObjectLiteral(arg1, arg2) {
  }
  NotObjectLiteral.ctorParameters = function() { return [
    "This is not an object literal",
    { type: 'ParamType', decorators: [{ type: core.Inject },] },
  ]; };
  return NotObjectLiteral;
}());

var NoTypeProperty = (function() {
  function NoTypeProperty(arg1, arg2) {
  }
  NoTypeProperty.ctorParameters = function() { return [
    {
      type: 'ParamType',
      decorators: [
        { notType: core.Inject },
        { type: core.Inject },
      ]
    },
  ]; };
  return NoTypeProperty;
}());

var NotIdentifier = (function() {
  function NotIdentifier(arg1, arg2) {
  }
  NotIdentifier.ctorParameters = function() { return [
    {
      type: 'ParamType',
      decorators: [
        { type: 'StringsLiteralsAreNotIdentifiers' },
        { type: core.Inject },
      ]
    },
  ]; };
  return NotIdentifier;
}());
`,
      };

      INVALID_CTOR_DECORATOR_ARGS_FILE = {
        name: _('/invalid_ctor_decorator_args.js'),
        contents: `
var core = require('@angular/core');
var NoArgsProperty = (function() {
  function NoArgsProperty(arg1) {
  }
  NoArgsProperty.ctorParameters = function() { return [
    { type: 'ParamType', decorators: [{ type: core.Inject },] },
  ]; };
  return NoArgsProperty;
}());

var args = [{ selector: '[ignored]' },];
var NoPropertyAssignment = (function() {
  function NoPropertyAssignment(arg1) {
  }
  NoPropertyAssignment.ctorParameters = function() { return [
    { type: 'ParamType', decorators: [{ type: core.Inject, args },] },
  ]; };
  return NoPropertyAssignment;
}());

var NotArrayLiteral = (function() {
  function NotArrayLiteral(arg1) {
  }
  NotArrayLiteral.ctorParameters = function() { return [
    { type: 'ParamType', decorators: [{ type: core.Inject, args: () => [{ selector: '[ignored]' },] },] },
  ]; };
  return NotArrayLiteral;
}());
`,
      };

      IMPORTS_FILES = [
        {
          name: _('/index.js'),
          contents: `
          var file_a = require('./file_a');
          var file_b = require('./file_b');
          var file_c = require('./file_c');
          `
        },
        {
          name: _('/file_a.js'),
          contents: `
var a = 'a';
exports.a = a;
`,
        },
        {
          name: _('/file_b.js'),
          contents: `
var file_a = require('./file_a');
var b = file_a.a;
var c = 'c';
var d = c;
`,
        },
        {
          name: _('/file_c.js'),
          contents: `
var file_a = require('./file_a');
var c = file_a.a;
`,
        },
      ];

      EXPORTS_FILES = [
        {
          name: _('/index.js'),
          contents: `
          var a_module = require('./a_module');
          var b_module = require('./b_module');
          var xtra_module = require('./xtra_module');
          var wildcard_reexports = require('./wildcard_reexports');
          `
        },
        {
          name: _('/a_module.js'),
          contents: `
var a = 'a';
exports.a = a;
`,
        },
        {
          name: _('/b_module.js'),
          contents: `
var core = require('@angular/core');
var a_module = require('./a_module');
var b = a_module.a;
var e = 'e';
var SomeClass = (function() {
  function SomeClass() {}
  return SomeClass;
}());

exports.Directive = core.Directive;
exports.a = a_module.a;
exports.b = b;
exports.c = a_module.a;
exports.d = b;
exports.e = e;
exports.DirectiveX = core.Directive;
exports.SomeClass = SomeClass;
`,
        },
        {
          name: _('/xtra_module.js'),
          contents: `
var xtra1 = 'xtra1';
var xtra2 = 'xtra2';
exports.xtra1 = xtra1;
exports.xtra2 = xtra2;
`,
        },
        {
          name: _('/wildcard_reexports.js'),
          contents: `
    function __export(m) {
      for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];
    }
    __export(require("./b_module"));
    __export(require("./xtra_module"));
    `
        },
      ];

      FUNCTION_BODY_FILE = {
        name: _('/function_body.js'),
        contents: `
function foo(x) {
  return x;
}
function bar(x, y) {
  if (y === void 0) { y = 42; }
  return x + y;
}
function complex() {
  var x = 42;
  return 42;
}
function baz(x) {
  var y;
  if (x === void 0) { y = 42; }
  return y;
}
var y;
function qux(x) {
  if (x === void 0) { y = 42; }
  return y;
}
function moo() {
  var x;
  if (x === void 0) { x = 42; }
  return x;
}
var x;
function juu() {
  if (x === void 0) { x = 42; }
  return x;
}
`
      };

      DECORATED_FILES = [
        {
          name: _('/primary.js'),
          contents: `
var core = require('@angular/core');
var secondary = require('./secondary');
var A = (function() {
  function A() {}
  A.decorators = [
    { type: core.Directive, args: [{ selector: '[a]' }] }
  ];
  return A;
}());
  var B = (function() {
  function B() {}
  B.decorators = [
    { type: core.Directive, args: [{ selector: '[b]' }] }
  ];
  return B;
}());
  function x() {}
  function y() {}
  var C = (function() {
  function C() {}
  return C;
});
exports.A = A;
exports.x = x;
exports.C = C;
`
        },
        {
          name: _('/secondary.js'),
          contents: `
var core = require('@angular/core');
var D = (function() {
  function D() {}
  D.decorators = [
    { type: core.Directive, args: [{ selector: '[d]' }] }
  ];
  return D;
}());
exports.D = D;
    `
        }
      ];

      TYPINGS_SRC_FILES = [
        {
          name: _('/src/index.js'),
          contents: `
var internal = require('./internal');
var class1 = require('./class1');
var class2 = require('./class2');
var missing = require('./missing-class');
var flatFile = require('./flat-file');
var func1 = require('./func1');
function __export(m) {
  for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];
}
var InternalClass = internal.InternalClass;
__export(class1);
__export(class2);
`
        },
        {
          name: _('/src/class1.js'),
          contents: `
var Class1 = (function() {
  function Class1() {}
  return Class1;
}());
var MissingClass1 = (function() {
  function MissingClass1() {}
  return MissingClass1;
}());
exports.Class1 = Class1;
exports.MissingClass1 = MissingClass1;
`
        },
        {
          name: _('/src/class2.js'),
          contents: `
var Class2 = (function() {
  function Class2() {}
  return Class2;
}());
exports.Class2 = Class2;
`
        },
        {name: _('/src/func1.js'), contents: 'function mooFn() {} export {mooFn}'}, {
          name: _('/src/internal.js'),
          contents: `
var InternalClass = (function() {
  function InternalClass() {}
  return InternalClass;
}());
var Class2 = (function() {
  function Class2() {}
  return Class2;
}());
exports.InternalClass =InternalClass;
exports.Class2 = Class2;
`
        },
        {
          name: _('/src/missing-class.js'),
          contents: `
var MissingClass2 = (function() {
  function MissingClass2() {}
  return MissingClass2;
}());
exports. MissingClass2 = MissingClass2;
`
        },
        {
          name: _('/src/flat-file.js'),
          contents: `
var Class1 = (function() {
  function Class1() {}
  return Class1;
}());
var MissingClass1 = (function() {
  function MissingClass1() {}
  return MissingClass1;
}());
var MissingClass2 = (function() {
  function MissingClass2() {}
  return MissingClass2;
}());
var Class3 = (function() {
  function Class3() {}
  return Class3;
}());
exports.Class1 = Class1;
exports.xClass3 = Class3;
exports.MissingClass1 = MissingClass1;
exports.MissingClass2 = MissingClass2;
`
        }
      ];

      TYPINGS_DTS_FILES = [
        {
          name: _('/typings/index.d.ts'),
          contents: `
              import {InternalClass} from './internal';
              import {mooFn} from './func1';
              export * from './class1';
              export * from './class2';
              `
        },
        {
          name: _('/typings/class1.d.ts'),
          contents: `export declare class Class1 {}\nexport declare class OtherClass {}`
        },
        {
          name: _('/typings/class2.d.ts'),
          contents:
              `export declare class Class2 {}\nexport declare interface SomeInterface {}\nexport {Class3 as xClass3} from './class3';`
        },
        {name: _('/typings/func1.d.ts'), contents: 'export declare function mooFn(): void;'},
        {
          name: _('/typings/internal.d.ts'),
          contents: `export declare class InternalClass {}\nexport declare class Class2 {}`
        },
        {name: _('/typings/class3.d.ts'), contents: `export declare class Class3 {}`},
      ];

      MODULE_WITH_PROVIDERS_PROGRAM = [
        {
          name: _('/src/index.js'),
          contents: `
          var functions = require('./functions');
          var methods = require('./methods');
          var aliased_class = require('./aliased_class');
          `
        },
        {
          name: _('/src/functions.js'),
          contents: `
var mod = require('./module');
var SomeService = (function() {
  function SomeService() {}
  return SomeService;
}());

var InternalModule = (function() {
  function InternalModule() {}
  return InternalModule;
}());

function aNumber() { return 42; }
function aString() { return 'foo'; }
function emptyObject() { return {}; }
function ngModuleIdentifier() { return { ngModule: InternalModule }; }
function ngModuleWithEmptyProviders() { return { ngModule: InternalModule, providers: [] }; }
function ngModuleWithProviders() { return { ngModule: InternalModule, providers: [SomeService] }; }
function onlyProviders() { return { providers: [SomeService] }; }
function ngModuleNumber() { return { ngModule: 42 }; }
function ngModuleString() { return { ngModule: 'foo' }; }
function ngModuleObject() { return { ngModule: { foo: 42 } }; }
function externalNgModule() { return { ngModule: mod.ExternalModule }; }
// NOTE: We do not include the "namespaced" export tests in CommonJS as all CommonJS exports are already namespaced.
// function namespacedExternalNgModule() { return { ngModule: mod.ExternalModule }; }

exports.aNumber = aNumber;
exports.aString = aString;
exports.emptyObject = emptyObject;
exports.ngModuleIdentifier = ngModuleIdentifier;
exports.ngModuleWithEmptyProviders = ngModuleWithEmptyProviders;
exports.ngModuleWithProviders = ngModuleWithProviders;
exports.onlyProviders = onlyProviders;
exports.ngModuleNumber = ngModuleNumber;
exports.ngModuleString = ngModuleString;
exports.ngModuleObject = ngModuleObject;
exports.externalNgModule = externalNgModule;
exports.SomeService = SomeService;
exports.InternalModule = InternalModule;
`
        },
        {
          name: _('/src/methods.js'),
          contents: `
var mod = require('./module');
var SomeService = (function() {
  function SomeService() {}
  return SomeService;
}());

var InternalModule = (function() {
  function InternalModule() {}
  InternalModule.prototype = {
    instanceNgModuleIdentifier: function() { return { ngModule: InternalModule }; },
    instanceNgModuleWithEmptyProviders: function() { return { ngModule: InternalModule, providers: [] }; },
    instanceNgModuleWithProviders: function() { return { ngModule: InternalModule, providers: [SomeService] }; },
    instanceExternalNgModule: function() { return { ngModule: mod.ExternalModule }; },
  };
  InternalModule.aNumber = function() { return 42; };
  InternalModule.aString = function() { return 'foo'; };
  InternalModule.emptyObject = function() { return {}; };
  InternalModule.ngModuleIdentifier = function() { return { ngModule: InternalModule }; };
  InternalModule.ngModuleWithEmptyProviders = function() { return { ngModule: InternalModule, providers: [] }; };
  InternalModule.ngModuleWithProviders = function() { return { ngModule: InternalModule, providers: [SomeService] }; };
  InternalModule.onlyProviders = function() { return { providers: [SomeService] }; };
  InternalModule.ngModuleNumber = function() { return { ngModule: 42 }; };
  InternalModule.ngModuleString = function() { return { ngModule: 'foo' }; };
  InternalModule.ngModuleObject = function() { return { ngModule: { foo: 42 } }; };
  InternalModule.externalNgModule = function() { return { ngModule: mod.ExternalModule }; };
  return InternalModule;
}());

exports.SomeService = SomeService;
exports.InternalModule = InternalModule;
`
        },
        {
          name: _('/src/aliased_class.js'),
          contents: `
var AliasedModule = (function() {
  function AliasedModule() {}
  AliasedModule_1 = AliasedModule;
  AliasedModule.forRoot = function() { return { ngModule: AliasedModule_1 }; };
  var AliasedModule_1;
  return AliasedModule;
}());
exports.AliasedModule = AliasedModule;
`
        },
        {
          name: _('/src/module.js'),
          contents: `
var ExternalModule = (function() {
  function ExternalModule() {}
  return ExternalModule;
}());
exports.ExternalModule = ExternalModule;
`
        },
      ];
    });

    describe('CommonJsReflectionHost', () => {

      describe('getDecoratorsOfDeclaration()', () => {
        it('should find the decorators on a class', () => {
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(classNode) !;

          expect(decorators).toBeDefined();
          expect(decorators.length).toEqual(1);

          const decorator = decorators[0];
          expect(decorator.name).toEqual('Directive');
          expect(decorator.import).toEqual({name: 'Directive', from: '@angular/core'});
          expect(decorator.args !.map(arg => arg.getText())).toEqual([
            '{ selector: \'[someDirective]\' }',
          ]);
        });

        it('should find the decorators on a class at the top level', () => {
          loadTestFiles([TOPLEVEL_DECORATORS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(TOPLEVEL_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, TOPLEVEL_DECORATORS_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(classNode) !;

          expect(decorators).toBeDefined();
          expect(decorators.length).toEqual(1);

          const decorator = decorators[0];
          expect(decorator.name).toEqual('Directive');
          expect(decorator.import).toEqual({name: 'Directive', from: '@angular/core'});
          expect(decorator.args !.map(arg => arg.getText())).toEqual([
            '{ selector: \'[someDirective]\' }',
          ]);
        });

        it('should return null if the symbol is not a class', () => {
          loadTestFiles([FOO_FUNCTION_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(FOO_FUNCTION_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const functionNode =
              getDeclaration(program, FOO_FUNCTION_FILE.name, 'foo', isNamedFunctionDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(functionNode);
          expect(decorators).toBe(null);
        });

        it('should return null if there are no decorators', () => {
          loadTestFiles([SIMPLE_CLASS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SIMPLE_CLASS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SIMPLE_CLASS_FILE.name, 'EmptyClass', isNamedVariableDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(classNode);
          expect(decorators).toBe(null);
        });

        it('should ignore `decorators` if it is not an array literal', () => {
          loadTestFiles([INVALID_DECORATORS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(INVALID_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_DECORATORS_FILE.name, 'NotArrayLiteral', isNamedVariableDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(classNode);
          expect(decorators).toEqual([]);
        });

        it('should ignore decorator elements that are not object literals', () => {
          loadTestFiles([INVALID_DECORATORS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(INVALID_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_DECORATORS_FILE.name, 'NotObjectLiteral',
              isNamedVariableDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(classNode) !;

          expect(decorators.length).toBe(1);
          expect(decorators[0]).toEqual(jasmine.objectContaining({name: 'Directive'}));
        });

        it('should ignore decorator elements that have no `type` property', () => {
          loadTestFiles([INVALID_DECORATORS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(INVALID_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_DECORATORS_FILE.name, 'NoTypeProperty', isNamedVariableDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(classNode) !;

          expect(decorators.length).toBe(1);
          expect(decorators[0]).toEqual(jasmine.objectContaining({name: 'Directive'}));
        });

        it('should ignore decorator elements whose `type` value is not an identifier', () => {
          loadTestFiles([INVALID_DECORATORS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(INVALID_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_DECORATORS_FILE.name, 'NotIdentifier', isNamedVariableDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(classNode) !;

          expect(decorators.length).toBe(1);
          expect(decorators[0]).toEqual(jasmine.objectContaining({name: 'Directive'}));
        });

        describe('(returned decorators `args`)', () => {
          it('should be an empty array if decorator has no `args` property', () => {
            loadTestFiles([INVALID_DECORATOR_ARGS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_DECORATOR_ARGS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_DECORATOR_ARGS_FILE.name, 'NoArgsProperty',
                isNamedVariableDeclaration);
            const decorators = host.getDecoratorsOfDeclaration(classNode) !;

            expect(decorators.length).toBe(1);
            expect(decorators[0].name).toBe('Directive');
            expect(decorators[0].args).toEqual([]);
          });

          it('should be an empty array if decorator\'s `args` has no property assignment', () => {
            loadTestFiles([INVALID_DECORATOR_ARGS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_DECORATOR_ARGS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_DECORATOR_ARGS_FILE.name, 'NoPropertyAssignment',
                isNamedVariableDeclaration);
            const decorators = host.getDecoratorsOfDeclaration(classNode) !;

            expect(decorators.length).toBe(1);
            expect(decorators[0].name).toBe('Directive');
            expect(decorators[0].args).toEqual([]);
          });

          it('should be an empty array if `args` property value is not an array literal', () => {
            loadTestFiles([INVALID_DECORATOR_ARGS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_DECORATOR_ARGS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_DECORATOR_ARGS_FILE.name, 'NotArrayLiteral',
                isNamedVariableDeclaration);
            const decorators = host.getDecoratorsOfDeclaration(classNode) !;

            expect(decorators.length).toBe(1);
            expect(decorators[0].name).toBe('Directive');
            expect(decorators[0].args).toEqual([]);
          });
        });
      });

      describe('getMembersOfClass()', () => {
        it('should find decorated members on a class', () => {
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);

          const input1 = members.find(member => member.name === 'input1') !;
          expect(input1.kind).toEqual(ClassMemberKind.Property);
          expect(input1.isStatic).toEqual(false);
          expect(input1.decorators !.map(d => d.name)).toEqual(['Input']);

          const input2 = members.find(member => member.name === 'input2') !;
          expect(input2.kind).toEqual(ClassMemberKind.Property);
          expect(input2.isStatic).toEqual(false);
          expect(input1.decorators !.map(d => d.name)).toEqual(['Input']);
        });

        it('should find decorated members on a class at the top level', () => {
          loadTestFiles([TOPLEVEL_DECORATORS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(TOPLEVEL_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, TOPLEVEL_DECORATORS_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);

          const input1 = members.find(member => member.name === 'input1') !;
          expect(input1.kind).toEqual(ClassMemberKind.Property);
          expect(input1.isStatic).toEqual(false);
          expect(input1.decorators !.map(d => d.name)).toEqual(['Input']);

          const input2 = members.find(member => member.name === 'input2') !;
          expect(input2.kind).toEqual(ClassMemberKind.Property);
          expect(input2.isStatic).toEqual(false);
          expect(input1.decorators !.map(d => d.name)).toEqual(['Input']);
        });

        it('should find non decorated properties on a class', () => {
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);

          const instanceProperty = members.find(member => member.name === 'instanceProperty') !;
          expect(instanceProperty.kind).toEqual(ClassMemberKind.Property);
          expect(instanceProperty.isStatic).toEqual(false);
          expect(ts.isBinaryExpression(instanceProperty.implementation !)).toEqual(true);
          expect(instanceProperty.value !.getText()).toEqual(`'instance'`);
        });

        it('should find static methods on a class', () => {
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);

          const staticMethod = members.find(member => member.name === 'staticMethod') !;
          expect(staticMethod.kind).toEqual(ClassMemberKind.Method);
          expect(staticMethod.isStatic).toEqual(true);
          expect(ts.isFunctionExpression(staticMethod.implementation !)).toEqual(true);
        });

        it('should find static properties on a class', () => {
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);

          const staticProperty = members.find(member => member.name === 'staticProperty') !;
          expect(staticProperty.kind).toEqual(ClassMemberKind.Property);
          expect(staticProperty.isStatic).toEqual(true);
          expect(ts.isPropertyAccessExpression(staticProperty.implementation !)).toEqual(true);
          expect(staticProperty.value !.getText()).toEqual(`'static'`);
        });

        it('should throw if the symbol is not a class', () => {
          loadTestFiles([FOO_FUNCTION_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(FOO_FUNCTION_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const functionNode =
              getDeclaration(program, FOO_FUNCTION_FILE.name, 'foo', isNamedFunctionDeclaration);
          expect(() => {
            host.getMembersOfClass(functionNode);
          }).toThrowError(`Attempted to get members of a non-class: "function foo() {}"`);
        });

        it('should return an empty array if there are no prop decorators', () => {
          loadTestFiles([SIMPLE_CLASS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SIMPLE_CLASS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SIMPLE_CLASS_FILE.name, 'EmptyClass', isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);

          expect(members).toEqual([]);
        });

        it('should not process decorated properties in `propDecorators` if it is not an object literal',
           () => {
             loadTestFiles([INVALID_PROP_DECORATORS_FILE]);
             const {program, host: compilerHost} =
                 makeTestBundleProgram(INVALID_PROP_DECORATORS_FILE.name);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
             const classNode = getDeclaration(
                 program, INVALID_PROP_DECORATORS_FILE.name, 'NotObjectLiteral',
                 isNamedVariableDeclaration);
             const members = host.getMembersOfClass(classNode);

             expect(members.map(member => member.name)).not.toContain('prop');
           });

        it('should ignore prop decorator elements that are not object literals', () => {
          loadTestFiles([INVALID_PROP_DECORATORS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(INVALID_PROP_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_PROP_DECORATORS_FILE.name, 'NotObjectLiteralProp',
              isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);
          const prop = members.find(m => m.name === 'prop') !;
          const decorators = prop.decorators !;

          expect(decorators.length).toBe(1);
          expect(decorators[0]).toEqual(jasmine.objectContaining({name: 'Directive'}));
        });

        it('should ignore prop decorator elements that have no `type` property', () => {
          loadTestFiles([INVALID_PROP_DECORATORS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(INVALID_PROP_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_PROP_DECORATORS_FILE.name, 'NoTypeProperty',
              isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);
          const prop = members.find(m => m.name === 'prop') !;
          const decorators = prop.decorators !;

          expect(decorators.length).toBe(1);
          expect(decorators[0]).toEqual(jasmine.objectContaining({name: 'Directive'}));
        });

        it('should ignore prop decorator elements whose `type` value is not an identifier', () => {
          loadTestFiles([INVALID_PROP_DECORATORS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(INVALID_PROP_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_PROP_DECORATORS_FILE.name, 'NotIdentifier',
              isNamedVariableDeclaration);
          const members = host.getMembersOfClass(classNode);
          const prop = members.find(m => m.name === 'prop') !;
          const decorators = prop.decorators !;

          expect(decorators.length).toBe(1);
          expect(decorators[0]).toEqual(jasmine.objectContaining({name: 'Directive'}));
        });

        it('should have import information on decorators', () => {
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);

          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const decorators = host.getDecoratorsOfDeclaration(classNode) !;

          expect(decorators.length).toEqual(1);
          expect(decorators[0].import).toEqual({name: 'Directive', from: '@angular/core'});
        });

        describe('(returned prop decorators `args`)', () => {
          it('should be an empty array if prop decorator has no `args` property', () => {
            loadTestFiles([INVALID_PROP_DECORATOR_ARGS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_PROP_DECORATOR_ARGS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_PROP_DECORATOR_ARGS_FILE.name, 'NoArgsProperty',
                isNamedVariableDeclaration);
            const members = host.getMembersOfClass(classNode);
            const prop = members.find(m => m.name === 'prop') !;
            const decorators = prop.decorators !;

            expect(decorators.length).toBe(1);
            expect(decorators[0].name).toBe('Input');
            expect(decorators[0].args).toEqual([]);
          });

          it('should be an empty array if prop decorator\'s `args` has no property assignment',
             () => {
               loadTestFiles([INVALID_PROP_DECORATOR_ARGS_FILE]);
               const {program, host: compilerHost} =
                   makeTestBundleProgram(INVALID_PROP_DECORATOR_ARGS_FILE.name);
               const host =
                   new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
               const classNode = getDeclaration(
                   program, INVALID_PROP_DECORATOR_ARGS_FILE.name, 'NoPropertyAssignment',
                   isNamedVariableDeclaration);
               const members = host.getMembersOfClass(classNode);
               const prop = members.find(m => m.name === 'prop') !;
               const decorators = prop.decorators !;

               expect(decorators.length).toBe(1);
               expect(decorators[0].name).toBe('Input');
               expect(decorators[0].args).toEqual([]);
             });

          it('should be an empty array if `args` property value is not an array literal', () => {
            loadTestFiles([INVALID_PROP_DECORATOR_ARGS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_PROP_DECORATOR_ARGS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_PROP_DECORATOR_ARGS_FILE.name, 'NotArrayLiteral',
                isNamedVariableDeclaration);
            const members = host.getMembersOfClass(classNode);
            const prop = members.find(m => m.name === 'prop') !;
            const decorators = prop.decorators !;

            expect(decorators.length).toBe(1);
            expect(decorators[0].name).toBe('Input');
            expect(decorators[0].args).toEqual([]);
          });
        });
      });

      describe('getConstructorParameters', () => {
        it('should find the decorated constructor parameters', () => {
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const parameters = host.getConstructorParameters(classNode);

          expect(parameters).toBeDefined();
          expect(parameters !.map(parameter => parameter.name)).toEqual([
            '_viewContainer', '_template', 'injected'
          ]);
          expectTypeValueReferencesForParameters(parameters !, [
            'ViewContainerRef',
            'TemplateRef',
            null,
          ]);
        });

        it('should find the decorated constructor parameters at the top level', () => {
          loadTestFiles([TOPLEVEL_DECORATORS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(TOPLEVEL_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, TOPLEVEL_DECORATORS_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const parameters = host.getConstructorParameters(classNode);

          expect(parameters).toBeDefined();
          expect(parameters !.map(parameter => parameter.name)).toEqual([
            '_viewContainer', '_template', 'injected'
          ]);
          expectTypeValueReferencesForParameters(parameters !, [
            'ViewContainerRef',
            'TemplateRef',
            null,
          ]);
        });

        it('should accept `ctorParameters` as an array', () => {
          loadTestFiles([CTOR_DECORATORS_ARRAY_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(CTOR_DECORATORS_ARRAY_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, CTOR_DECORATORS_ARRAY_FILE.name, 'CtorDecoratedAsArray',
              isNamedVariableDeclaration);
          const parameters = host.getConstructorParameters(classNode) !;

          expect(parameters).toBeDefined();
          expect(parameters.map(parameter => parameter.name)).toEqual(['arg1']);
          expectTypeValueReferencesForParameters(parameters, ['ParamType']);
        });

        it('should throw if the symbol is not a class', () => {
          loadTestFiles([FOO_FUNCTION_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(FOO_FUNCTION_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const functionNode =
              getDeclaration(program, FOO_FUNCTION_FILE.name, 'foo', isNamedFunctionDeclaration);
          expect(() => { host.getConstructorParameters(functionNode); })
              .toThrowError(
                  'Attempted to get constructor parameters of a non-class: "function foo() {}"');
        });

        // In ES5 there is no such thing as a constructor-less class
        // it('should return `null` if there is no constructor', () => { });

        it('should return an array even if there are no decorators', () => {
          loadTestFiles([SIMPLE_CLASS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SIMPLE_CLASS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SIMPLE_CLASS_FILE.name, 'NoDecoratorConstructorClass',
              isNamedVariableDeclaration);
          const parameters = host.getConstructorParameters(classNode);

          expect(parameters).toEqual(jasmine.any(Array));
          expect(parameters !.length).toEqual(1);
          expect(parameters ![0].name).toEqual('foo');
          expect(parameters ![0].decorators).toBe(null);
        });

        it('should return an empty array if there are no constructor parameters', () => {
          loadTestFiles([INVALID_CTOR_DECORATORS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(INVALID_CTOR_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_CTOR_DECORATORS_FILE.name, 'NoParameters',
              isNamedVariableDeclaration);
          const parameters = host.getConstructorParameters(classNode);

          expect(parameters).toEqual([]);
        });

        // In ES5 there are no arrow functions
        // it('should ignore `ctorParameters` if it is an arrow function', () => { });

        it('should ignore `ctorParameters` if it does not return an array literal', () => {
          loadTestFiles([INVALID_CTOR_DECORATORS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(INVALID_CTOR_DECORATORS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, INVALID_CTOR_DECORATORS_FILE.name, 'NotArrayLiteral',
              isNamedVariableDeclaration);
          const parameters = host.getConstructorParameters(classNode);

          expect(parameters !.length).toBe(1);
          expect(parameters ![0]).toEqual(jasmine.objectContaining<CtorParameter>({
            name: 'arg1',
            decorators: null,
          }));
        });

        describe('(returned parameters `decorators`)', () => {
          it('should ignore param decorator elements that are not object literals', () => {
            loadTestFiles([INVALID_CTOR_DECORATORS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_CTOR_DECORATORS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_CTOR_DECORATORS_FILE.name, 'NotObjectLiteral',
                isNamedVariableDeclaration);
            const parameters = host.getConstructorParameters(classNode);

            expect(parameters !.length).toBe(2);
            expect(parameters ![0]).toEqual(jasmine.objectContaining<CtorParameter>({
              name: 'arg1',
              decorators: null,
            }));
            expect(parameters ![1]).toEqual(jasmine.objectContaining<CtorParameter>({
              name: 'arg2',
              decorators: jasmine.any(Array) as any
            }));
          });

          it('should ignore param decorator elements that have no `type` property', () => {
            loadTestFiles([INVALID_CTOR_DECORATORS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_CTOR_DECORATORS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_CTOR_DECORATORS_FILE.name, 'NoTypeProperty',
                isNamedVariableDeclaration);
            const parameters = host.getConstructorParameters(classNode);
            const decorators = parameters ![0].decorators !;

            expect(decorators.length).toBe(1);
            expect(decorators[0]).toEqual(jasmine.objectContaining({name: 'Inject'}));
          });

          it('should ignore param decorator elements whose `type` value is not an identifier',
             () => {
               loadTestFiles([INVALID_CTOR_DECORATORS_FILE]);
               const {program, host: compilerHost} =
                   makeTestBundleProgram(INVALID_CTOR_DECORATORS_FILE.name);
               const host =
                   new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
               const classNode = getDeclaration(
                   program, INVALID_CTOR_DECORATORS_FILE.name, 'NotIdentifier',
                   isNamedVariableDeclaration);
               const parameters = host.getConstructorParameters(classNode);
               const decorators = parameters ![0].decorators !;

               expect(decorators.length).toBe(1);
               expect(decorators[0]).toEqual(jasmine.objectContaining({name: 'Inject'}));
             });

          it('should have import information on decorators', () => {
            loadTestFiles([SOME_DIRECTIVE_FILE]);
            const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);

            const parameters = host.getConstructorParameters(classNode);
            const decorators = parameters ![2].decorators !;

            expect(decorators.length).toEqual(1);
            expect(decorators[0].name).toBe('Inject');
            expect(decorators[0].import).toEqual({name: 'Inject', from: '@angular/core'});
          });
        });

        describe('(returned parameters `decorators.args`)', () => {
          it('should be an empty array if param decorator has no `args` property', () => {
            loadTestFiles([INVALID_CTOR_DECORATOR_ARGS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_CTOR_DECORATOR_ARGS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_CTOR_DECORATOR_ARGS_FILE.name, 'NoArgsProperty',
                isNamedVariableDeclaration);
            const parameters = host.getConstructorParameters(classNode);
            expect(parameters !.length).toBe(1);
            const decorators = parameters ![0].decorators !;

            expect(decorators.length).toBe(1);
            expect(decorators[0].name).toBe('Inject');
            expect(decorators[0].args).toEqual([]);
          });

          it('should be an empty array if param decorator\'s `args` has no property assignment',
             () => {
               loadTestFiles([INVALID_CTOR_DECORATOR_ARGS_FILE]);
               const {program, host: compilerHost} =
                   makeTestBundleProgram(INVALID_CTOR_DECORATOR_ARGS_FILE.name);
               const host =
                   new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
               const classNode = getDeclaration(
                   program, INVALID_CTOR_DECORATOR_ARGS_FILE.name, 'NoPropertyAssignment',
                   isNamedVariableDeclaration);
               const parameters = host.getConstructorParameters(classNode);
               const decorators = parameters ![0].decorators !;

               expect(decorators.length).toBe(1);
               expect(decorators[0].name).toBe('Inject');
               expect(decorators[0].args).toEqual([]);
             });

          it('should be an empty array if `args` property value is not an array literal', () => {
            loadTestFiles([INVALID_CTOR_DECORATOR_ARGS_FILE]);
            const {program, host: compilerHost} =
                makeTestBundleProgram(INVALID_CTOR_DECORATOR_ARGS_FILE.name);
            const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
            const classNode = getDeclaration(
                program, INVALID_CTOR_DECORATOR_ARGS_FILE.name, 'NotArrayLiteral',
                isNamedVariableDeclaration);
            const parameters = host.getConstructorParameters(classNode);
            const decorators = parameters ![0].decorators !;

            expect(decorators.length).toBe(1);
            expect(decorators[0].name).toBe('Inject');
            expect(decorators[0].args).toEqual([]);
          });
        });
      });

      describe('getDefinitionOfFunction()', () => {
        it('should return an object describing the function declaration passed as an argument',
           () => {
             loadTestFiles([FUNCTION_BODY_FILE]);
             const {program, host: compilerHost} = makeTestBundleProgram(FUNCTION_BODY_FILE.name);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);

             const fooNode = getDeclaration(
                 program, FUNCTION_BODY_FILE.name, 'foo', isNamedFunctionDeclaration) !;
             const fooDef = host.getDefinitionOfFunction(fooNode) !;
             expect(fooDef.node).toBe(fooNode);
             expect(fooDef.body !.length).toEqual(1);
             expect(fooDef.body ![0].getText()).toEqual(`return x;`);
             expect(fooDef.parameters.length).toEqual(1);
             expect(fooDef.parameters[0].name).toEqual('x');
             expect(fooDef.parameters[0].initializer).toBe(null);

             const barNode = getDeclaration(
                 program, FUNCTION_BODY_FILE.name, 'bar', isNamedFunctionDeclaration) !;
             const barDef = host.getDefinitionOfFunction(barNode) !;
             expect(barDef.node).toBe(barNode);
             expect(barDef.body !.length).toEqual(1);
             expect(ts.isReturnStatement(barDef.body ![0])).toBeTruthy();
             expect(barDef.body ![0].getText()).toEqual(`return x + y;`);
             expect(barDef.parameters.length).toEqual(2);
             expect(barDef.parameters[0].name).toEqual('x');
             expect(fooDef.parameters[0].initializer).toBe(null);
             expect(barDef.parameters[1].name).toEqual('y');
             expect(barDef.parameters[1].initializer !.getText()).toEqual('42');

             const bazNode = getDeclaration(
                 program, FUNCTION_BODY_FILE.name, 'baz', isNamedFunctionDeclaration) !;
             const bazDef = host.getDefinitionOfFunction(bazNode) !;
             expect(bazDef.node).toBe(bazNode);
             expect(bazDef.body !.length).toEqual(3);
             expect(bazDef.parameters.length).toEqual(1);
             expect(bazDef.parameters[0].name).toEqual('x');
             expect(bazDef.parameters[0].initializer).toBe(null);

             const quxNode = getDeclaration(
                 program, FUNCTION_BODY_FILE.name, 'qux', isNamedFunctionDeclaration) !;
             const quxDef = host.getDefinitionOfFunction(quxNode) !;
             expect(quxDef.node).toBe(quxNode);
             expect(quxDef.body !.length).toEqual(2);
             expect(quxDef.parameters.length).toEqual(1);
             expect(quxDef.parameters[0].name).toEqual('x');
             expect(quxDef.parameters[0].initializer).toBe(null);
           });
      });

      describe('getImportOfIdentifier', () => {
        it('should find the import of an identifier', () => {
          loadTestFiles(IMPORTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/index.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const variableNode =
              getDeclaration(program, _('/file_b.js'), 'b', isNamedVariableDeclaration);
          const identifier = (variableNode.initializer &&
                              ts.isPropertyAccessExpression(variableNode.initializer)) ?
              variableNode.initializer.name :
              null;

          expect(identifier).not.toBe(null);
          const importOfIdent = host.getImportOfIdentifier(identifier !);
          expect(importOfIdent).toEqual({name: 'a', from: './file_a'});
        });

        it('should find the import of an identifier in a declaration file', () => {
          loadTestFiles([
            {
              name: _('/index.d.ts'),
              contents: `
                import {MyClass} from './myclass.d.ts';
                export declare const a: MyClass;`
            },
            {
              name: _('/myclass.d.ts'),
              contents: `export declare class MyClass {}`,
            }
          ]);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/index.d.ts'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const variableNode =
              getDeclaration(program, _('/index.d.ts'), 'a', isNamedVariableDeclaration);
          const identifier =
              ((variableNode.type as ts.TypeReferenceNode).typeName as ts.Identifier);

          const importOfIdent = host.getImportOfIdentifier(identifier !);
          expect(importOfIdent).toEqual({name: 'MyClass', from: './myclass.d.ts'});
        });

        it('should return null if the identifier was not imported', () => {
          loadTestFiles(IMPORTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/index.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const variableNode =
              getDeclaration(program, _('/file_b.js'), 'd', isNamedVariableDeclaration);
          const importOfIdent =
              host.getImportOfIdentifier(variableNode.initializer as ts.Identifier);

          expect(importOfIdent).toBeNull();
        });

        it('should handle factory functions not wrapped in parentheses', () => {
          loadTestFiles(IMPORTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/index.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const variableNode =
              getDeclaration(program, _('/file_c.js'), 'c', isNamedVariableDeclaration);
          const identifier = (variableNode.initializer &&
                              ts.isPropertyAccessExpression(variableNode.initializer)) ?
              variableNode.initializer.name :
              null;

          expect(identifier).not.toBe(null);
          const importOfIdent = host.getImportOfIdentifier(identifier !);
          expect(importOfIdent).toEqual({name: 'a', from: './file_a'});
        });
      });

      describe('getDeclarationOfIdentifier', () => {
        it('should return the declaration of a locally defined identifier', () => {
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const ctrDecorators = host.getConstructorParameters(classNode) !;
          const identifierOfViewContainerRef = (ctrDecorators[0].typeValueReference !as{
                                                 local: true,
                                                 expression: ts.Identifier,
                                                 defaultImportStatement: null,
                                               }).expression;

          const expectedDeclarationNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'ViewContainerRef', isNamedVariableDeclaration);
          const actualDeclaration = host.getDeclarationOfIdentifier(identifierOfViewContainerRef);
          expect(actualDeclaration).not.toBe(null);
          expect(actualDeclaration !.node).toBe(expectedDeclarationNode);
          expect(actualDeclaration !.viaModule).toBe(null);
        });

        it('should return the source-file of an import namespace', () => {
          loadFakeCore(getFileSystem());
          loadTestFiles([SOME_DIRECTIVE_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SOME_DIRECTIVE_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode = getDeclaration(
              program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
          const classDecorators = host.getDecoratorsOfDeclaration(classNode) !;
          const identifierOfDirective = (((classDecorators[0].node as ts.ObjectLiteralExpression)
                                              .properties[0] as ts.PropertyAssignment)
                                             .initializer as ts.PropertyAccessExpression)
                                            .expression as ts.Identifier;

          const expectedDeclarationNode =
              getSourceFileOrError(program, _('/node_modules/@angular/core/index.d.ts'));
          const actualDeclaration = host.getDeclarationOfIdentifier(identifierOfDirective);
          expect(actualDeclaration).not.toBe(null);
          expect(actualDeclaration !.node).toBe(expectedDeclarationNode);
          expect(actualDeclaration !.viaModule).toBe('@angular/core');
        });

        it('should return viaModule: null for relative imports', () => {
          loadTestFiles([
            {
              name: _('/index.js'),
              contents: `
              const a = require('./a');
              var b = a.b;
            `,
            },
            {
              name: _('/a.js'),
              contents: `
              exports.b = 1;
              `
            }
          ]);

          const {program, host: compilerHost} = makeTestBundleProgram(_('/index.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const variableNode =
              getDeclaration(program, _('/index.js'), 'b', isNamedVariableDeclaration);
          const identifier = variableNode.name as ts.Identifier;

          const importOfIdent = host.getDeclarationOfIdentifier(identifier !) !;
          expect(importOfIdent.node).not.toBeNull();
          expect(importOfIdent.viaModule).toBeNull();
        });

        it('should return a viaModule for absolute imports', () => {
          loadTestFiles([
            {
              name: _('/index.js'),
              contents: `
              var a = require('lib');
              var b = a.x;
            `,
            },
            {
              name: _('/node_modules/lib/index.d.ts'),
              contents: 'export declare const x: number;',
            },
          ]);

          const {program, host: compilerHost} = makeTestBundleProgram(_('/index.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const variableNode =
              getDeclaration(program, _('/index.js'), 'b', isNamedVariableDeclaration);
          const identifier = (variableNode.initializer !as ts.PropertyAccessExpression).name;

          const importOfIdent = host.getDeclarationOfIdentifier(identifier !) !;
          expect(importOfIdent.viaModule).toBe('lib');
        });
      });

      describe('getExportsOfModule()', () => {
        it('should return a map of all the exports from a given module', () => {
          loadFakeCore(getFileSystem());
          loadTestFiles(EXPORTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/index.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const file = getSourceFileOrError(program, _('/b_module.js'));
          const exportDeclarations = host.getExportsOfModule(file);
          expect(exportDeclarations).not.toBe(null);
          expect(Array.from(exportDeclarations !.entries())
                     .map(entry => [entry[0], entry[1].node !.getText(), entry[1].viaModule]))
              .toEqual([
                ['Directive', `Directive: FnWithArg<(clazz: any) => any>`, '@angular/core'],
                ['a', `a = 'a'`, null],
                ['b', `b = a_module.a`, null],
                ['c', `a = 'a'`, null],
                ['d', `b = a_module.a`, null],
                ['e', `e = 'e'`, null],
                ['DirectiveX', `Directive: FnWithArg<(clazz: any) => any>`, '@angular/core'],
                [
                  'SomeClass',
                  `SomeClass = (function() {\n  function SomeClass() {}\n  return SomeClass;\n}())`,
                  null
                ],
              ]);
        });

        it('should handle wildcard re-exports of other modules', () => {
          loadFakeCore(getFileSystem());
          loadTestFiles(EXPORTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/index.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const file = getSourceFileOrError(program, _('/wildcard_reexports.js'));
          const exportDeclarations = host.getExportsOfModule(file);
          expect(exportDeclarations).not.toBe(null);
          expect(Array.from(exportDeclarations !.entries())
                     .map(entry => [entry[0], entry[1].node !.getText(), entry[1].viaModule]))
              .toEqual([
                ['Directive', `Directive: FnWithArg<(clazz: any) => any>`, _('/b_module')],
                ['a', `a = 'a'`, _('/b_module')],
                ['b', `b = a_module.a`, _('/b_module')],
                ['c', `a = 'a'`, _('/b_module')],
                ['d', `b = a_module.a`, _('/b_module')],
                ['e', `e = 'e'`, _('/b_module')],
                ['DirectiveX', `Directive: FnWithArg<(clazz: any) => any>`, _('/b_module')],
                [
                  'SomeClass',
                  `SomeClass = (function() {\n  function SomeClass() {}\n  return SomeClass;\n}())`,
                  _('/b_module')
                ],
                ['xtra1', `xtra1 = 'xtra1'`, _('/xtra_module')],
                ['xtra2', `xtra2 = 'xtra2'`, _('/xtra_module')],
              ]);
        });

        it('should handle inline exports', () => {
          loadTestFiles([INLINE_EXPORT_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/inline_export.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const file = getSourceFileOrError(program, _('/inline_export.js'));
          const exportDeclarations = host.getExportsOfModule(file);
          expect(exportDeclarations).not.toBeNull();
          const decl = exportDeclarations !.get('directives') as InlineDeclaration;
          expect(decl).not.toBeUndefined();
          expect(decl.node).toBeNull();
          expect(decl.expression).toBeDefined();
        });
      });

      describe('getClassSymbol()', () => {
        it('should return the class symbol for an ES2015 class', () => {
          loadTestFiles([SIMPLE_ES2015_CLASS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(SIMPLE_ES2015_CLASS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const node = getDeclaration(
              program, SIMPLE_ES2015_CLASS_FILE.name, 'EmptyClass', isNamedClassDeclaration);
          const classSymbol = host.getClassSymbol(node);

          expect(classSymbol).toBeDefined();
          expect(classSymbol !.declaration.valueDeclaration).toBe(node);
          expect(classSymbol !.implementation.valueDeclaration).toBe(node);
        });

        it('should return the class symbol for an ES5 class (outer variable declaration)', () => {
          loadTestFiles([SIMPLE_CLASS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SIMPLE_CLASS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const outerNode = getDeclaration(
              program, SIMPLE_CLASS_FILE.name, 'EmptyClass', isNamedVariableDeclaration);
          const innerNode = getIifeBody(outerNode) !.statements.find(isNamedFunctionDeclaration) !;
          const classSymbol = host.getClassSymbol(outerNode);

          expect(classSymbol).toBeDefined();
          expect(classSymbol !.declaration.valueDeclaration).toBe(outerNode);
          expect(classSymbol !.implementation.valueDeclaration).toBe(innerNode);
        });

        it('should return the class symbol for an ES5 class (inner function declaration)', () => {
          loadTestFiles([SIMPLE_CLASS_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(SIMPLE_CLASS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const outerNode = getDeclaration(
              program, SIMPLE_CLASS_FILE.name, 'EmptyClass', isNamedVariableDeclaration);
          const innerNode = getIifeBody(outerNode) !.statements.find(isNamedFunctionDeclaration) !;
          const classSymbol = host.getClassSymbol(innerNode);

          expect(classSymbol).toBeDefined();
          expect(classSymbol !.declaration.valueDeclaration).toBe(outerNode);
          expect(classSymbol !.implementation.valueDeclaration).toBe(innerNode);
        });

        it('should return the same class symbol (of the outer declaration) for outer and inner declarations',
           () => {
             loadTestFiles([SIMPLE_CLASS_FILE]);
             const {program, host: compilerHost} = makeTestBundleProgram(SIMPLE_CLASS_FILE.name);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
             const outerNode = getDeclaration(
                 program, SIMPLE_CLASS_FILE.name, 'EmptyClass', isNamedVariableDeclaration);
             const innerNode =
                 getIifeBody(outerNode) !.statements.find(isNamedFunctionDeclaration) !;

             const innerSymbol = host.getClassSymbol(innerNode) !;
             const outerSymbol = host.getClassSymbol(outerNode) !;
             expect(innerSymbol.declaration).toBe(outerSymbol.declaration);
             expect(innerSymbol.implementation).toBe(outerSymbol.implementation);
           });

        it('should return undefined if node is not an ES5 class', () => {
          loadTestFiles([FOO_FUNCTION_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(FOO_FUNCTION_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const node =
              getDeclaration(program, FOO_FUNCTION_FILE.name, 'foo', isNamedFunctionDeclaration);
          const classSymbol = host.getClassSymbol(node);

          expect(classSymbol).toBeUndefined();
        });

        it('should return undefined if variable declaration is not initialized using an IIFE',
           () => {
             const testFile = {
               name: _('/test.js'),
               contents: `var MyClass = null;`,
             };
             loadTestFiles([testFile]);
             const {program, host: compilerHost} = makeTestBundleProgram(testFile.name);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
             const node =
                 getDeclaration(program, testFile.name, 'MyClass', isNamedVariableDeclaration);
             const classSymbol = host.getClassSymbol(node);

             expect(classSymbol).toBeUndefined();
           });
      });

      describe('isClass()', () => {
        it('should return true if a given node is a TS class declaration', () => {
          loadTestFiles([SIMPLE_ES2015_CLASS_FILE]);
          const {program, host: compilerHost} =
              makeTestBundleProgram(SIMPLE_ES2015_CLASS_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const node = getDeclaration(
              program, SIMPLE_ES2015_CLASS_FILE.name, 'EmptyClass', isNamedClassDeclaration);
          expect(host.isClass(node)).toBe(true);
        });

        it('should return true if a given node is the outer variable declaration of a class',
           () => {
             loadTestFiles([SIMPLE_CLASS_FILE]);
             const {program, host: compilerHost} = makeTestBundleProgram(SIMPLE_CLASS_FILE.name);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
             const node = getDeclaration(
                 program, SIMPLE_CLASS_FILE.name, 'EmptyClass', ts.isVariableDeclaration);
             expect(host.isClass(node)).toBe(true);
           });

        it('should return true if a given node is the inner variable declaration of a class',
           () => {
             loadTestFiles([SIMPLE_CLASS_FILE]);
             const {program, host: compilerHost} = makeTestBundleProgram(SIMPLE_CLASS_FILE.name);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
             const outerNode = getDeclaration(
                 program, SIMPLE_CLASS_FILE.name, 'EmptyClass', ts.isVariableDeclaration);
             const innerNode =
                 getIifeBody(outerNode) !.statements.find(isNamedFunctionDeclaration) !;
             expect(host.isClass(innerNode)).toBe(true);
           });

        it('should return false if a given node is a function declaration', () => {
          loadTestFiles([FOO_FUNCTION_FILE]);
          const {program, host: compilerHost} = makeTestBundleProgram(FOO_FUNCTION_FILE.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const node =
              getDeclaration(program, FOO_FUNCTION_FILE.name, 'foo', isNamedFunctionDeclaration);
          expect(host.isClass(node)).toBe(false);
        });
      });

      describe('hasBaseClass()', () => {
        function hasBaseClass(source: string) {
          const file = {
            name: _('/synthesized_constructors.js'),
            contents: source,
          };

          loadTestFiles([file]);
          const {program, host: compilerHost} = makeTestBundleProgram(file.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode =
              getDeclaration(program, file.name, 'TestClass', isNamedVariableDeclaration);
          return host.hasBaseClass(classNode);
        }

        it('should consider an IIFE with _super parameter as having a base class', () => {
          const result = hasBaseClass(`
        var TestClass = /** @class */ (function (_super) {
          __extends(TestClass, _super);
          function TestClass() {}
          return TestClass;
        }(null));`);
          expect(result).toBe(true);
        });

        it('should consider an IIFE with a unique name generated for the _super parameter as having a base class',
           () => {
             const result = hasBaseClass(`
        var TestClass = /** @class */ (function (_super_1) {
          __extends(TestClass, _super_1);
          function TestClass() {}
          return TestClass;
        }(null));`);
             expect(result).toBe(true);
           });

        it('should not consider an IIFE without parameter as having a base class', () => {
          const result = hasBaseClass(`
        var TestClass = /** @class */ (function () {
          __extends(TestClass, _super);
          function TestClass() {}
          return TestClass;
        }(null));`);
          expect(result).toBe(false);
        });
      });

      describe('getBaseClassExpression()', () => {
        function getBaseClassIdentifier(source: string): ts.Identifier|null {
          const file = {
            name: _('/synthesized_constructors.js'),
            contents: source,
          };

          loadTestFiles([file]);
          const {program, host: compilerHost} = makeTestBundleProgram(file.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode =
              getDeclaration(program, file.name, 'TestClass', isNamedVariableDeclaration);
          const expression = host.getBaseClassExpression(classNode);
          if (expression !== null && !ts.isIdentifier(expression)) {
            throw new Error(
                'Expected class to inherit via an identifier but got: ' + expression.getText());
          }
          return expression;
        }

        it('should find the base class of an IIFE with _super parameter', () => {
          const identifier = getBaseClassIdentifier(`
          var BaseClass = /** @class */ (function () {
            function BaseClass() {}
            return BaseClass;
          }());
          var TestClass = /** @class */ (function (_super) {
            __extends(TestClass, _super);
            function TestClass() {}
            return TestClass;
          }(BaseClass));`);
          expect(identifier !.text).toBe('BaseClass');
        });

        it('should find the base class of an IIFE with a unique name generated for the _super parameter',
           () => {
             const identifier = getBaseClassIdentifier(`
          var BaseClass = /** @class */ (function () {
            function BaseClass() {}
            return BaseClass;
          }());
          var TestClass = /** @class */ (function (_super_1) {
            __extends(TestClass, _super_1);
            function TestClass() {}
            return TestClass;
          }(BaseClass));`);
             expect(identifier !.text).toBe('BaseClass');
           });

        it('should not find a base class for an IIFE without parameter', () => {
          const identifier = getBaseClassIdentifier(`
          var BaseClass = /** @class */ (function () {
            function BaseClass() {}
            return BaseClass;
          }());
          var TestClass = /** @class */ (function () {
            __extends(TestClass, _super);
            function TestClass() {}
            return TestClass;
          }(BaseClass));`);
          expect(identifier).toBe(null);
        });

        it('should find a dynamic base class expression of an IIFE', () => {
          const file = {
            name: _('/synthesized_constructors.js'),
            contents: `
            var BaseClass = /** @class */ (function () {
              function BaseClass() {}
              return BaseClass;
            }());
            function foo() { return BaseClass; }
            var TestClass = /** @class */ (function (_super) {
              __extends(TestClass, _super);
              function TestClass() {}
              return TestClass;
            }(foo()));`,
          };

          loadTestFiles([file]);
          const {program, host: compilerHost} = makeTestBundleProgram(file.name);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const classNode =
              getDeclaration(program, file.name, 'TestClass', isNamedVariableDeclaration);
          const expression = host.getBaseClassExpression(classNode) !;
          expect(expression.getText()).toBe('foo()');
        });
      });

      describe('findClassSymbols()', () => {
        it('should return an array of all classes in the given source file', () => {
          loadTestFiles(DECORATED_FILES);
          const {program, host: compilerHost} =
              makeTestBundleProgram(getRootFiles(DECORATED_FILES)[0]);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const primaryFile = getSourceFileOrError(program, DECORATED_FILES[0].name);
          const secondaryFile = getSourceFileOrError(program, DECORATED_FILES[1].name);

          const classSymbolsPrimary = host.findClassSymbols(primaryFile);
          expect(classSymbolsPrimary.length).toEqual(2);
          expect(classSymbolsPrimary.map(c => c.name)).toEqual(['A', 'B']);

          const classSymbolsSecondary = host.findClassSymbols(secondaryFile);
          expect(classSymbolsSecondary.length).toEqual(1);
          expect(classSymbolsSecondary.map(c => c.name)).toEqual(['D']);
        });
      });

      describe('getDecoratorsOfSymbol()', () => {
        it('should return decorators of class symbol', () => {
          loadTestFiles(DECORATED_FILES);
          const {program, host: compilerHost} =
              makeTestBundleProgram(getRootFiles(DECORATED_FILES)[0]);
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const primaryFile = getSourceFileOrError(program, DECORATED_FILES[0].name);
          const secondaryFile = getSourceFileOrError(program, DECORATED_FILES[1].name);

          const classSymbolsPrimary = host.findClassSymbols(primaryFile);
          const classDecoratorsPrimary =
              classSymbolsPrimary.map(s => host.getDecoratorsOfSymbol(s));
          expect(classDecoratorsPrimary.length).toEqual(2);
          expect(classDecoratorsPrimary[0] !.map(d => d.name)).toEqual(['Directive']);
          expect(classDecoratorsPrimary[1] !.map(d => d.name)).toEqual(['Directive']);

          const classSymbolsSecondary = host.findClassSymbols(secondaryFile);
          const classDecoratorsSecondary =
              classSymbolsSecondary.map(s => host.getDecoratorsOfSymbol(s));
          expect(classDecoratorsSecondary.length).toEqual(1);
          expect(classDecoratorsSecondary[0] !.map(d => d.name)).toEqual(['Directive']);
        });
      });

      describe('getDtsDeclarationsOfClass()', () => {
        it('should find the dts declaration that has the same relative path to the source file',
           () => {
             loadTestFiles(TYPINGS_SRC_FILES);
             loadTestFiles(TYPINGS_DTS_FILES);
             const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
             const dts = makeTestDtsBundleProgram(_('/typings/index.d.ts'), _('/'));
             const class1 =
                 getDeclaration(program, _('/src/class1.js'), 'Class1', ts.isVariableDeclaration);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dts);

             const dtsDeclaration = host.getDtsDeclaration(class1);
             expect(dtsDeclaration !.getSourceFile().fileName).toEqual(_('/typings/class1.d.ts'));
           });

        it('should find the dts declaration for exported functions', () => {
          loadTestFiles(TYPINGS_SRC_FILES);
          loadTestFiles(TYPINGS_DTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
          const dts = makeTestDtsBundleProgram(_('/typings/index.d.ts'), _('/'));
          const mooFn =
              getDeclaration(program, _('/src/func1.js'), 'mooFn', ts.isFunctionDeclaration);
          const host =
              new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dts);
          const dtsDeclaration = host.getDtsDeclaration(mooFn);
          expect(dtsDeclaration !.getSourceFile().fileName).toEqual(_('/typings/func1.d.ts'));
        });

        it('should return null if there is no matching class in the matching dts file', () => {
          loadTestFiles(TYPINGS_SRC_FILES);
          loadTestFiles(TYPINGS_DTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
          const dts = makeTestDtsBundleProgram(_('/typings/index.d.ts'), _('/'));
          const missingClass = getDeclaration(
              program, _('/src/class1.js'), 'MissingClass1', ts.isVariableDeclaration);
          const host =
              new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dts);

          expect(host.getDtsDeclaration(missingClass)).toBe(null);
        });

        it('should return null if there is no matching dts file', () => {
          loadTestFiles(TYPINGS_SRC_FILES);
          loadTestFiles(TYPINGS_DTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
          const dts = makeTestDtsBundleProgram(_('/typings/index.d.ts'), _('/'));
          const missingClass = getDeclaration(
              program, _('/src/missing-class.js'), 'MissingClass2', ts.isVariableDeclaration);
          const host =
              new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dts);

          expect(host.getDtsDeclaration(missingClass)).toBe(null);
        });

        it('should find the dts file that contains a matching class declaration, even if the source files do not match',
           () => {
             loadTestFiles(TYPINGS_SRC_FILES);
             loadTestFiles(TYPINGS_DTS_FILES);
             const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
             const dts = makeTestDtsBundleProgram(_('/typings/index.d.ts'), _('/'));
             const class1 = getDeclaration(
                 program, _('/src/flat-file.js'), 'Class1', ts.isVariableDeclaration);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dts);

             const dtsDeclaration = host.getDtsDeclaration(class1);
             expect(dtsDeclaration !.getSourceFile().fileName).toEqual(_('/typings/class1.d.ts'));
           });

        it('should find aliased exports', () => {
          loadTestFiles(TYPINGS_SRC_FILES);
          loadTestFiles(TYPINGS_DTS_FILES);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
          const dts = makeTestDtsBundleProgram(_('/typings/index.d.ts'), _('/'));
          const class3 =
              getDeclaration(program, _('/src/flat-file.js'), 'Class3', ts.isVariableDeclaration);
          const host =
              new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dts);

          const dtsDeclaration = host.getDtsDeclaration(class3);
          expect(dtsDeclaration !.getSourceFile().fileName).toEqual(_('/typings/class3.d.ts'));
        });

        it('should find the dts file that contains a matching class declaration, even if the class is not publicly exported',
           () => {
             loadTestFiles(TYPINGS_SRC_FILES);
             loadTestFiles(TYPINGS_DTS_FILES);
             const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
             const dts = makeTestDtsBundleProgram(_('/typings/index.d.ts'), _('/'));
             const internalClass = getDeclaration(
                 program, _('/src/internal.js'), 'InternalClass', ts.isVariableDeclaration);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dts);

             const dtsDeclaration = host.getDtsDeclaration(internalClass);
             expect(dtsDeclaration !.getSourceFile().fileName).toEqual(_('/typings/internal.d.ts'));
           });

        it('should prefer the publicly exported class if there are multiple classes with the same name',
           () => {
             loadTestFiles(TYPINGS_SRC_FILES);
             loadTestFiles(TYPINGS_DTS_FILES);
             const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
             const dts = makeTestDtsBundleProgram(_('/typings/index.d.ts'), _('/'));
             const class2 =
                 getDeclaration(program, _('/src/class2.js'), 'Class2', ts.isVariableDeclaration);
             const internalClass2 =
                 getDeclaration(program, _('/src/internal.js'), 'Class2', ts.isVariableDeclaration);
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dts);

             const class2DtsDeclaration = host.getDtsDeclaration(class2);
             expect(class2DtsDeclaration !.getSourceFile().fileName)
                 .toEqual(_('/typings/class2.d.ts'));

             const internalClass2DtsDeclaration = host.getDtsDeclaration(internalClass2);
             expect(internalClass2DtsDeclaration !.getSourceFile().fileName)
                 .toEqual(_('/typings/class2.d.ts'));
           });
      });

      describe('getModuleWithProvidersFunctions', () => {
        it('should find every exported function that returns an object that looks like a ModuleWithProviders object',
           () => {
             loadTestFiles(MODULE_WITH_PROVIDERS_PROGRAM);
             const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
             const file = getSourceFileOrError(program, _('/src/functions.js'));
             const fns = host.getModuleWithProvidersFunctions(file);
             expect(fns.map(fn => [fn.declaration.name !.getText(), fn.ngModule.node.name.text]))
                 .toEqual([
                   ['ngModuleIdentifier', 'InternalModule'],
                   ['ngModuleWithEmptyProviders', 'InternalModule'],
                   ['ngModuleWithProviders', 'InternalModule'],
                   ['externalNgModule', 'ExternalModule'],
                 ]);
           });

        it('should find every static method on exported classes that return an object that looks like a ModuleWithProviders object',
           () => {
             loadTestFiles(MODULE_WITH_PROVIDERS_PROGRAM);
             const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
             const host =
                 new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
             const file = getSourceFileOrError(program, _('/src/methods.js'));
             const fn = host.getModuleWithProvidersFunctions(file);
             expect(fn.map(fn => [fn.declaration.getText(), fn.ngModule.node.name.text])).toEqual([
               [
                 'function() { return { ngModule: InternalModule }; }',
                 'InternalModule',
               ],
               [
                 'function() { return { ngModule: InternalModule, providers: [] }; }',
                 'InternalModule',
               ],
               [
                 'function() { return { ngModule: InternalModule, providers: [SomeService] }; }',
                 'InternalModule',
               ],
               [
                 'function() { return { ngModule: mod.ExternalModule }; }',
                 'ExternalModule',
               ],
             ]);
           });

        // https://github.com/angular/angular/issues/29078
        it('should resolve aliased module references to their original declaration', () => {
          loadTestFiles(MODULE_WITH_PROVIDERS_PROGRAM);
          const {program, host: compilerHost} = makeTestBundleProgram(_('/src/index.js'));
          const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
          const file = getSourceFileOrError(program, _('/src/aliased_class.js'));
          const fn = host.getModuleWithProvidersFunctions(file);
          expect(fn.map(fn => [fn.declaration.getText(), fn.ngModule.node.name.text])).toEqual([
            ['function() { return { ngModule: AliasedModule_1 }; }', 'AliasedModule'],
          ]);
        });
      });
    });
  });
});