/**
 * @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 {ClassMemberKind, CtorParameter, Import, isNamedClassDeclaration, isNamedFunctionDeclaration, isNamedVariableDeclaration} from '../../../src/ngtsc/reflection';
import {CommonJsReflectionHost} from '../../src/host/commonjs_host';
import {Esm2015ReflectionHost} from '../../src/host/esm2015_host';
import {getIifeBody} from '../../src/host/esm5_host';
import {MockLogger} from '../helpers/mock_logger';
import {getDeclaration, makeTestBundleProgram} from '../helpers/utils';

import {expectTypeValueReferencesForParameters} from './util';

const 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;
`
};

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

const 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;
`,
};

const 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;
`,
};

const 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;
}());
`,
};

const 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;
}());
`,
};

const 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;
}());
`,
};

const 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;
}());
`,
};

const 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;
}());
`,
};

const 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;
}());
`,
};

const IMPORTS_FILES = [
  {
    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;
`,
  },
];

const EXPORTS_FILES = [
  {
    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"));
    `
  },
];

const 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;
}
`
};

const 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;
    `
  }
];

const TYPINGS_SRC_FILES = [
  {
    name: '/src/index.js',
    contents: `
var internal = require('./internal');
var class1 = require('./class1');
var class2 = require('./class2');
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;
`
  }
];

const TYPINGS_DTS_FILES = [
  {
    name: '/typings/index.d.ts',
    contents:
        `import {InternalClass} from './internal'; 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 {}`},
];

const MODULE_WITH_PROVIDERS_PROGRAM = [
  {
    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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      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 return null if the symbol is not a class', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([FOO_FUNCTION_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SIMPLE_CLASS_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_DECORATORS_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_DECORATORS_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_DECORATORS_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_DECORATORS_FILE]);
      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'}));
    });

    it('should use `getImportOfIdentifier()` to retrieve import info', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
      const mockImportInfo: Import = {from: '@angular/core', name: 'Directive'};
      const spy = spyOn(host, 'getImportOfIdentifier').and.returnValue(mockImportInfo);

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

      expect(decorators.length).toEqual(1);
      expect(decorators[0].import).toBe(mockImportInfo);

      const typeIdentifier = spy.calls.mostRecent().args[0] as ts.Identifier;
      expect(typeIdentifier.text).toBe('Directive');
    });

    describe('(returned decorators `args`)', () => {
      it('should be an empty array if decorator has no `args` property', () => {
        const {program, host: compilerHost} = makeTestBundleProgram([INVALID_DECORATOR_ARGS_FILE]);
        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', () => {
        const {program, host: compilerHost} = makeTestBundleProgram([INVALID_DECORATOR_ARGS_FILE]);
        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', () => {
        const {program, host: compilerHost} = makeTestBundleProgram([INVALID_DECORATOR_ARGS_FILE]);
        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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      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 non decorated properties on a class', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([FOO_FUNCTION_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SIMPLE_CLASS_FILE]);
      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',
       () => {
         const {program, host: compilerHost} =
             makeTestBundleProgram([INVALID_PROP_DECORATORS_FILE]);
         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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_PROP_DECORATORS_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_PROP_DECORATORS_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_PROP_DECORATORS_FILE]);
      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 use `getImportOfIdentifier()` to retrieve import info', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
      const mockImportInfo = { name: 'mock', from: '@angular/core' } as Import;
      const spy = spyOn(host, 'getImportOfIdentifier').and.returnValue(mockImportInfo);

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

      expect(decorators.length).toEqual(1);
      expect(decorators[0].import).toBe(mockImportInfo);

      const typeIdentifier = spy.calls.mostRecent().args[0] as ts.Identifier;
      expect(typeIdentifier.text).toBe('Directive');
    });

    describe('(returned prop decorators `args`)', () => {
      it('should be an empty array if prop decorator has no `args` property', () => {
        const {program, host: compilerHost} =
            makeTestBundleProgram([INVALID_PROP_DECORATOR_ARGS_FILE]);
        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', () => {
        const {program, host: compilerHost} =
            makeTestBundleProgram([INVALID_PROP_DECORATOR_ARGS_FILE]);
        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', () => {
        const {program, host: compilerHost} =
            makeTestBundleProgram([INVALID_PROP_DECORATOR_ARGS_FILE]);
        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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      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 throw if the symbol is not a class', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([FOO_FUNCTION_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SIMPLE_CLASS_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_CTOR_DECORATORS_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([INVALID_CTOR_DECORATORS_FILE]);
      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', () => {
        const {program, host: compilerHost} = makeTestBundleProgram([INVALID_CTOR_DECORATORS_FILE]);
        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', () => {
        const {program, host: compilerHost} = makeTestBundleProgram([INVALID_CTOR_DECORATORS_FILE]);
        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', () => {
        const {program, host: compilerHost} = makeTestBundleProgram([INVALID_CTOR_DECORATORS_FILE]);
        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 use `getImportOfIdentifier()` to retrieve import info', () => {
        const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
        const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
        const classNode = getDeclaration(
            program, SOME_DIRECTIVE_FILE.name, 'SomeDirective', isNamedVariableDeclaration);
        const mockImportInfo: Import = {from: '@angular/core', name: 'Directive'};
        const spy = spyOn(CommonJsReflectionHost.prototype, 'getImportOfIdentifier')
                        .and.returnValue(mockImportInfo);

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

        expect(decorators.length).toEqual(1);
        expect(decorators[0].import).toBe(mockImportInfo);

        const typeIdentifier = spy.calls.mostRecent().args[0] as ts.Identifier;
        expect(typeIdentifier.text).toBe('Inject');
      });
    });

    describe('(returned parameters `decorators.args`)', () => {
      it('should be an empty array if param decorator has no `args` property', () => {
        const {program, host: compilerHost} =
            makeTestBundleProgram([INVALID_CTOR_DECORATOR_ARGS_FILE]);
        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', () => {
        const {program, host: compilerHost} =
            makeTestBundleProgram([INVALID_CTOR_DECORATOR_ARGS_FILE]);
        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', () => {
        const {program, host: compilerHost} =
            makeTestBundleProgram([INVALID_CTOR_DECORATOR_ARGS_FILE]);
        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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([FUNCTION_BODY_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(IMPORTS_FILES);
      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 return null if the identifier was not imported', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(IMPORTS_FILES);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(IMPORTS_FILES);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SOME_DIRECTIVE_FILE]);
      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 =
          program.getSourceFile('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');
    });
  });

  describe('getExportsOfModule()', () => {
    it('should return a map of all the exports from a given module', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(EXPORTS_FILES);
      const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
      const file = program.getSourceFile('/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'`, '/a_module'],
            ['b', `b = a_module.a`, null],
            ['c', `a = 'a'`, '/a_module'],
            ['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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(EXPORTS_FILES);
      const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
      const file = program.getSourceFile('/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'],
          ]);
    });
  });

  describe('getClassSymbol()', () => {
    it('should return the class symbol for an ES2015 class', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SIMPLE_ES2015_CLASS_FILE]);
      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 !.valueDeclaration).toBe(node);
    });

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

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

    it('should return the class symbol for an ES5 class (inner function declaration)', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([SIMPLE_CLASS_FILE]);
      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 !.valueDeclaration).toBe(outerNode);
    });

    it('should return the same class symbol (of the outer declaration) for outer and inner declarations',
       () => {
         const {program, host: compilerHost} = makeTestBundleProgram([SIMPLE_CLASS_FILE]);
         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) !;

         expect(host.getClassSymbol(innerNode)).toBe(host.getClassSymbol(outerNode));
       });

    it('should return undefined if node is not an ES5 class', () => {
      const {program, host: compilerHost} = makeTestBundleProgram([FOO_FUNCTION_FILE]);
      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();
    });
  });

  describe('isClass()', () => {
    let host: CommonJsReflectionHost;
    let mockNode: ts.Node;
    let getClassDeclarationSpy: jasmine.Spy;
    let superGetClassDeclarationSpy: jasmine.Spy;

    beforeEach(() => {
      const {program, host: compilerHost} = makeTestBundleProgram([SIMPLE_CLASS_FILE]);
      host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
      mockNode = {} as any;

      getClassDeclarationSpy = spyOn(CommonJsReflectionHost.prototype, 'getClassDeclaration');
      superGetClassDeclarationSpy = spyOn(Esm2015ReflectionHost.prototype, 'getClassDeclaration');
    });

    it('should return true if superclass returns true', () => {
      superGetClassDeclarationSpy.and.returnValue(true);
      getClassDeclarationSpy.and.callThrough();

      expect(host.isClass(mockNode)).toBe(true);
      expect(getClassDeclarationSpy).toHaveBeenCalledWith(mockNode);
      expect(superGetClassDeclarationSpy).toHaveBeenCalledWith(mockNode);
    });

    it('should return true if it can find a declaration for the class', () => {
      getClassDeclarationSpy.and.returnValue(true);

      expect(host.isClass(mockNode)).toBe(true);
      expect(getClassDeclarationSpy).toHaveBeenCalledWith(mockNode);
    });

    it('should return false if it cannot find a declaration for the class', () => {
      getClassDeclarationSpy.and.returnValue(false);

      expect(host.isClass(mockNode)).toBe(false);
      expect(getClassDeclarationSpy).toHaveBeenCalledWith(mockNode);
    });
  });

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

      const {program, host: compilerHost} = makeTestBundleProgram([file]);
      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('findClassSymbols()', () => {
    it('should return an array of all classes in the given source file', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(DECORATED_FILES);
      const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
      const primaryFile = program.getSourceFile(DECORATED_FILES[0].name) !;
      const secondaryFile = program.getSourceFile(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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(DECORATED_FILES);
      const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
      const primaryFile = program.getSourceFile(DECORATED_FILES[0].name) !;
      const secondaryFile = program.getSourceFile(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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(TYPINGS_SRC_FILES);
      const dts = makeTestBundleProgram(TYPINGS_DTS_FILES);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(TYPINGS_SRC_FILES);
      const dtsProgram = makeTestBundleProgram(TYPINGS_DTS_FILES);
      const mooFn = getDeclaration(program, '/src/func1.js', 'mooFn', ts.isFunctionDeclaration);
      const host =
          new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost, dtsProgram);

      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(TYPINGS_SRC_FILES);
      const dts = makeTestBundleProgram(TYPINGS_DTS_FILES);
      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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(TYPINGS_SRC_FILES);
      const dts = makeTestBundleProgram(TYPINGS_DTS_FILES);
      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',
       () => {
         const {program, host: compilerHost} = makeTestBundleProgram(TYPINGS_SRC_FILES);
         const dts = makeTestBundleProgram(TYPINGS_DTS_FILES);
         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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(TYPINGS_SRC_FILES);
      const dts = makeTestBundleProgram(TYPINGS_DTS_FILES);
      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',
       () => {
         const {program, host: compilerHost} = makeTestBundleProgram(TYPINGS_SRC_FILES);
         const dts = makeTestBundleProgram(TYPINGS_DTS_FILES);
         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',
       () => {
         const {program, host: compilerHost} = makeTestBundleProgram(TYPINGS_SRC_FILES);
         const dts = makeTestBundleProgram(TYPINGS_DTS_FILES);
         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',
       () => {
         const {program, host: compilerHost} = makeTestBundleProgram(MODULE_WITH_PROVIDERS_PROGRAM);
         const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
         const file = program.getSourceFile('/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',
       () => {
         const {program, host: compilerHost} = makeTestBundleProgram(MODULE_WITH_PROVIDERS_PROGRAM);
         const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
         const file = program.getSourceFile('/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', () => {
      const {program, host: compilerHost} = makeTestBundleProgram(MODULE_WITH_PROVIDERS_PROGRAM);
      const host = new CommonJsReflectionHost(new MockLogger(), false, program, compilerHost);
      const file = program.getSourceFile('/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'],
      ]);
    });
  });
});