',
})
export class TestCmp {}
@NgModule({
declarations: [TestCmp],
imports: [MiddleAModule],
})
export class EntryModule {}
`);
env.write('middle-a.ts', `
import {NgModule} from '@angular/core';
import {MiddleBModule} from './middle-b';
@NgModule({
exports: [MiddleBModule],
})
export class MiddleAModule {}
`);
env.write('middle-b.ts', `
import {NgModule} from '@angular/core';
@NgModule({})
export class MiddleBModule {}
`);
env.write('dir_module.ts', `
import {NgModule} from '@angular/core';
import {Dir} from './dir';
@NgModule({
declarations: [Dir],
exports: [Dir],
})
export class DirModule {}
`);
env.write('dir.ts', `
import {Directive} from '@angular/core';
@Directive({
selector: '[dir]',
})
export class Dir {}
`);
env.driveMain();
expect(env.getContents('entry.js')).not.toContain('Dir');
env.write('middle-b.ts', `
import {NgModule} from '@angular/core';
import {DirModule} from './dir_module';
@NgModule({
exports: [DirModule],
})
export class MiddleBModule {}
`);
env.driveMain();
expect(env.getContents('entry.js')).toContain('Dir');
});
it('should rebuild a component if removed from an NgModule', () => {
// This test consists of a component with a dependency (the directive DepDir) provided via an
// NgModule. Initially this configuration is built, then the component is removed from its
// module (which removes DepDir from the component's scope) and a rebuild is performed.
// The compiler should re-emit the component without DepDir in its scope.
//
// This is a tricky scenario due to the backwards dependency arrow from a component to its
// module.
env.write('dep.ts', `
import {Directive, NgModule} from '@angular/core';
@Directive({selector: '[dep]'})
export class DepDir {}
@NgModule({
declarations: [DepDir],
exports: [DepDir],
})
export class DepModule {}
`);
env.write('cmp.ts', `
import {Component} from '@angular/core';
@Component({
selector: 'test-cmp',
template: '
',
})
export class Cmp {}
`);
env.write('module.ts', `
import {NgModule} from '@angular/core';
import {Cmp} from './cmp';
import {DepModule} from './dep';
@NgModule({
declarations: [Cmp],
imports: [DepModule],
})
export class Module {}
`);
env.driveMain();
env.flushWrittenFileTracking();
// Remove the component from the module and recompile.
env.write('module.ts', `
import {NgModule} from '@angular/core';
import {DepModule} from './dep';
@NgModule({
declarations: [],
imports: [DepModule],
})
export class Module {}
`);
env.driveMain();
// After removing the component from the module, it should have been re-emitted without DepDir
// in its scope.
expect(env.getFilesWrittenSinceLastFlush()).toContain('/cmp.js');
expect(env.getContents('cmp.js')).not.toContain('DepDir');
});
it('should rebuild only a Component (but with the correct CompilationScope) if its template has changed',
() => {
setupFooBarProgram(env);
// Make a change to the template of BarComponent.
env.write('bar_component.html', '
changed
');
env.driveMain();
const written = env.getFilesWrittenSinceLastFlush();
expect(written).not.toContain('/bar_directive.js');
expect(written).toContain('/bar_component.js');
expect(written).not.toContain('/bar_module.js');
expect(written).not.toContain('/foo_component.js');
expect(written).not.toContain('/foo_pipe.js');
expect(written).not.toContain('/foo_module.js');
// Ensure that the used directives are included in the component's generated template.
expect(env.getContents('/built/bar_component.js')).toMatch(/directives:\s*\[.+\.BarDir\]/);
});
it('should rebuild everything if a typings file changes', () => {
setupFooBarProgram(env);
// Pretend a change was made to a typings file.
env.invalidateCachedFile('foo_selector.d.ts');
env.driveMain();
const written = env.getFilesWrittenSinceLastFlush();
expect(written).toContain('/bar_directive.js');
expect(written).toContain('/bar_component.js');
expect(written).toContain('/bar_module.js');
expect(written).toContain('/foo_component.js');
expect(written).toContain('/foo_pipe.js');
expect(written).toContain('/foo_module.js');
});
it('should compile incrementally with template type-checking turned on', () => {
env.tsconfig({fullTemplateTypeCheck: true});
env.write('main.ts', `
import {Component} from '@angular/core';
@Component({template: ''})
export class MyComponent {}
`);
env.driveMain();
env.invalidateCachedFile('main.ts');
env.driveMain();
// If program reuse were configured incorrectly (as was responsible for
// https://github.com/angular/angular/issues/30079), this would have crashed.
});
// https://github.com/angular/angular/issues/38979
it('should retain ambient types provided by auto-discovered @types', () => {
// This test verifies that ambient types declared in node_modules/@types are still available
// in incremental compilations. In the below code, the usage of `require` should be valid
// in the original program and the incremental program.
env.tsconfig({fullTemplateTypeCheck: true});
env.write('node_modules/@types/node/index.d.ts', 'declare var require: any;');
env.write('main.ts', `
import {Component} from '@angular/core';
require('path');
@Component({template: ''})
export class MyComponent {}
`);
env.driveMain();
env.invalidateCachedFile('main.ts');
const diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
// https://github.com/angular/angular/pull/26036
it('should handle redirected source files', () => {
env.tsconfig({fullTemplateTypeCheck: true});
// This file structure has an identical version of "a" under the root node_modules and inside
// of "b". Because their package.json file indicates it is the exact same version of "a",
// TypeScript will transform the source file of "node_modules/b/node_modules/a/index.d.ts"
// into a redirect to "node_modules/a/index.d.ts". During incremental compilations, we must
// assure not to reintroduce "node_modules/b/node_modules/a/index.d.ts" as its redirected
// source file, but instead use its original file.
env.write('node_modules/a/index.js', `export class ServiceA {}`);
env.write('node_modules/a/index.d.ts', `export declare class ServiceA {}`);
env.write('node_modules/a/package.json', `{"name": "a", "version": "1.0"}`);
env.write('node_modules/b/node_modules/a/index.js', `export class ServiceA {}`);
env.write('node_modules/b/node_modules/a/index.d.ts', `export declare class ServiceA {}`);
env.write('node_modules/b/node_modules/a/package.json', `{"name": "a", "version": "1.0"}`);
env.write('node_modules/b/index.js', `export {ServiceA as ServiceB} from 'a';`);
env.write('node_modules/b/index.d.ts', `export {ServiceA as ServiceB} from 'a';`);
env.write('test.ts', `
import {Component} from '@angular/core';
import {ServiceA} from 'a';
import {ServiceB} from 'b';
@Component({template: ''})
export class MyComponent {}
`);
env.driveMain();
env.flushWrittenFileTracking();
// Pretend a change was made to test.ts. If redirect sources were introduced into the new
// program, this would fail due to an assertion failure in TS.
env.invalidateCachedFile('test.ts');
env.driveMain();
});
describe('template type-checking', () => {
beforeEach(() => {
env.tsconfig({strictTemplates: true});
});
it('should repeat type errors across rebuilds, even if nothing has changed', () => {
// This test verifies that when a project is rebuilt multiple times with no changes, all
// template diagnostics are produced each time. Different types of errors are checked:
// - a general type error
// - an unmatched binding
// - a DOM schema error
env.write('component.ts', `
import {Component} from '@angular/core';
@Component({
selector: 'test-cmp',
template: \`
{{notAProperty}}
\`,
})
export class TestCmp {}
`);
let diags = env.driveDiagnostics();
// Should get a diagnostic for each line in the template.
expect(diags.length).toBe(3);
// Now rebuild without any changes, and verify they're still produced.
diags = env.driveDiagnostics();
expect(diags.length).toBe(3);
// If it's worth testing, it's worth overtesting.
//
// Actually, the above only tests the transition from "initial" to "incremental"
// compilation. The next build verifies that an "incremental to incremental" transition
// preserves the diagnostics as well.
diags = env.driveDiagnostics();
expect(diags.length).toBe(3);
});
it('should pick up errors caused by changing an unrelated interface', () => {
// The premise of this test is that `iface.ts` declares an interface which is used to type
// a property of a component. The interface is then changed in a subsequent compilation in
// a way that introduces a type error in the template. The test verifies the resulting
// diagnostic is produced.
env.write('iface.ts', `
export interface SomeType {
field: string;
}
`);
env.write('component.ts', `
import {Component} from '@angular/core';
import {SomeType} from './iface';
@Component({
selector: 'test-cmp',
template: '{{ doSomething(value.field) }}',
})
export class TestCmp {
value!: SomeType;
// Takes a string value only.
doSomething(param: string): string {
return param;
}
}
`);
expect(env.driveDiagnostics().length).toBe(0);
env.flushWrittenFileTracking();
// Change the interface.
env.write('iface.ts', `
export interface SomeType {
field: number;
}
`);
expect(env.driveDiagnostics().length).toBe(1);
});
it('should retain default imports that have been converted into a value expression', () => {
// This test defines the component `TestCmp` that has a default-imported class as
// constructor parameter, and uses `TestDir` in its template. An incremental compilation
// updates `TestDir` and changes its inputs, thereby triggering re-emit of `TestCmp` without
// performing re-analysis of `TestCmp`. The output of the re-emitted file for `TestCmp`
// should continue to have retained the default import.
env.write('service.ts', `
import {Injectable} from '@angular/core';
@Injectable({ providedIn: 'root' })
export default class DefaultService {}
`);
env.write('cmp.ts', `
import {Component, Directive} from '@angular/core';
import DefaultService from './service';
@Component({
template: '
',
})
export class TestCmp {
constructor(service: DefaultService) {}
}
`);
env.write('dir.ts', `
import {Directive} from '@angular/core';
@Directive({ selector: '[dir]' })
export class TestDir {}
`);
env.write('mod.ts', `
import {NgModule} from '@angular/core';
import {TestDir} from './dir';
import {TestCmp} from './cmp';
@NgModule({ declarations: [TestDir, TestCmp] })
export class TestMod {}
`);
env.driveMain();
env.flushWrittenFileTracking();
// Update `TestDir` to change its inputs, triggering a re-emit of `TestCmp` that uses
// `TestDir`.
env.write('dir.ts', `
import {Directive} from '@angular/core';
@Directive({ selector: '[dir]', inputs: ['added'] })
export class TestDir {}
`);
env.driveMain();
// Verify that `TestCmp` was indeed re-emitted.
const written = env.getFilesWrittenSinceLastFlush();
expect(written).toContain('/dir.js');
expect(written).toContain('/cmp.js');
// Verify that the default import is still present.
const content = env.getContents('cmp.js');
expect(content).toContain(`import DefaultService from './service';`);
});
it('should recompile when a remote change happens to a scope', () => {
// The premise of this test is that the component Cmp has a template error (a binding to an
// unknown property). Cmp is in ModuleA, which imports ModuleB, which declares Dir that has
// the property. Because ModuleB doesn't export Dir, it's not visible to Cmp - hence the
// error.
// In the test, during the incremental rebuild Dir is exported from ModuleB. This is a
// change to the scope of ModuleA made by changing ModuleB (hence, a "remote change"). The
// test verifies that incremental template type-checking.
env.write('cmp.ts', `
import {Component} from '@angular/core';
@Component({
selector: 'test-cmp',
template: '
',
})
export class Cmp {}
`);
env.write('module-a.ts', `
import {NgModule} from '@angular/core';
import {Cmp} from './cmp';
import {ModuleB} from './module-b';
@NgModule({
declarations: [Cmp],
imports: [ModuleB],
})
export class ModuleA {}
`);
// Declare ModuleB and a directive Dir, but ModuleB does not yet export Dir.
env.write('module-b.ts', `
import {NgModule} from '@angular/core';
import {Dir} from './dir';
@NgModule({
declarations: [Dir],
})
export class ModuleB {}
`);
env.write('dir.ts', `
import {Directive, Input} from '@angular/core';
@Directive({selector: '[dir]'})
export class Dir {
@Input() someInput!: any;
}
`);
let diags = env.driveDiagnostics();
// Should get a diagnostic about [dir] not being a valid binding.
expect(diags.length).toBe(1);
// As a precautionary check, run the build a second time with no changes, to ensure the
// diagnostic is repeated.
diags = env.driveDiagnostics();
// Should get a diagnostic about [dir] not being a valid binding.
expect(diags.length).toBe(1);
// Modify ModuleB to now export Dir.
env.write('module-b.ts', `
import {NgModule} from '@angular/core';
import {Dir} from './dir';
@NgModule({
declarations: [Dir],
exports: [Dir],
})
export class ModuleB {}
`);
diags = env.driveDiagnostics();
// Diagnostic should be gone, as the error has been fixed.
expect(diags.length).toBe(0);
});
describe('inline operations', () => {
it('should still pick up on errors from inlined type check blocks', () => {
// In certain cases the template type-checker has to inline type checking blocks into user
// code, instead of placing it in a parallel template type-checking file. In these cases
// incremental checking cannot be used, and the type-checking code must be regenerated on
// each build. This test verifies that the above mechanism works properly, by performing
// type-checking on an unexported class (not exporting the class forces the inline
// checking de-optimization).
env.write('cmp.ts', `
import {Component} from '@angular/core';
@Component({
selector: 'test-cmp',
template: '{{test}}',
})
class Cmp {}
`);
// On the first compilation, an error should be produced.
let diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
// Next, two more builds are run, one with no changes made to the file, and the other with
// changes made that should remove the error.
// The error should still be present when rebuilding.
diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
// Now, correct the error by adding the 'test' property to the component.
env.write('cmp.ts', `
import {Component} from '@angular/core';
@Component({
selector: 'test-cmp',
template: '{{test}}',
})
class Cmp {
test!: string;
}
`);
env.driveMain();
// The error should be gone.
diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
it('should still pick up on errors caused by inlined type constructors', () => {
// In certain cases the template type-checker cannot generate a type constructor for a
// directive within the template type-checking file which requires it, but must inline the
// type constructor within its original source file. In these cases, template type
// checking cannot be performed incrementally. This test verifies that such cases still
// work correctly, by repeatedly performing diagnostics on a component which depends on a
// directive with an inlined type constructor.
env.write('dir.ts', `
import {Directive, Input} from '@angular/core';
export interface Keys {
alpha: string;
beta: string;
}
@Directive({
selector: '[dir]'
})
export class Dir
{
// The use of 'keyof' in the generic bound causes a deopt to an inline type
// constructor.
@Input() dir: T;
}
`);
env.write('cmp.ts', `
import {Component, NgModule} from '@angular/core';
import {Dir} from './dir';
@Component({
selector: 'test-cmp',
template: '',
})
export class Cmp {}
@NgModule({
declarations: [Cmp, Dir],
})
export class Module {}
`);
let diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toContain(`Type '"gamma"' is not assignable to type 'keyof Keys'.`);
// On a rebuild, the same errors should be present.
diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toContain(`Type '"gamma"' is not assignable to type 'keyof Keys'.`);
});
});
});
});
function setupFooBarProgram(env: NgtscTestEnvironment) {
env.write('foo_component.ts', `
import {Component} from '@angular/core';
import {fooSelector} from './foo_selector';
@Component({
selector: fooSelector,
template: '{{ 1 | foo }}'
})
export class FooCmp {}
`);
env.write('foo_pipe.ts', `
import {Pipe} from '@angular/core';
@Pipe({name: 'foo'})
export class FooPipe {}
`);
env.write('foo_module.ts', `
import {NgModule} from '@angular/core';
import {FooCmp} from './foo_component';
import {FooPipe} from './foo_pipe';
import {BarModule} from './bar_module';
@NgModule({
declarations: [FooCmp, FooPipe],
imports: [BarModule],
})
export class FooModule {}
`);
env.write('bar_component.ts', `
import {Component} from '@angular/core';
@Component({selector: 'bar', templateUrl: './bar_component.html'})
export class BarCmp {}
`);
env.write('bar_component.html', '');
env.write('bar_directive.ts', `
import {Directive} from '@angular/core';
@Directive({selector: '[bar]'})
export class BarDir {}
`);
env.write('bar_pipe.ts', `
import {Pipe} from '@angular/core';
@Pipe({name: 'foo'})
export class BarPipe {}
`);
env.write('bar_module.ts', `
import {NgModule} from '@angular/core';
import {BarCmp} from './bar_component';
import {BarDir} from './bar_directive';
import {BarPipe} from './bar_pipe';
@NgModule({
declarations: [BarCmp, BarDir, BarPipe],
exports: [BarCmp, BarPipe],
})
export class BarModule {}
`);
env.write('foo_selector.d.ts', `
export const fooSelector = 'foo';
`);
env.driveMain();
env.flushWrittenFileTracking();
}
});