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2291 lines (1950 loc) · 74.5 KB
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/**
* @license
* Copyright Google LLC 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 {ErrorCode, ngErrorCode} from '../../src/ngtsc/diagnostics';
import {absoluteFrom as _, getFileSystem, getSourceFileOrError} from '../../src/ngtsc/file_system';
import {runInEachFileSystem} from '../../src/ngtsc/file_system/testing';
import {expectCompleteReuse} from '../../src/ngtsc/testing';
import {loadStandardTestFiles} from '../helpers/src/mock_file_loading';
import {NgtscTestEnvironment} from './env';
const testFiles = loadStandardTestFiles();
runInEachFileSystem(() => {
describe('ngtsc type checking', () => {
let env!: NgtscTestEnvironment;
beforeEach(() => {
env = NgtscTestEnvironment.setup(testFiles);
env.tsconfig({fullTemplateTypeCheck: true});
env.write('node_modules/@angular/common/index.d.ts', `
import * as i0 from '@angular/core';
export declare class NgForOfContext<T, U extends i0.NgIterable<T> = i0.NgIterable<T>> {
$implicit: T;
count: number;
readonly even: boolean;
readonly first: boolean;
index: number;
readonly last: boolean;
ngForOf: U;
readonly odd: boolean;
constructor($implicit: T, ngForOf: U, index: number, count: number);
}
export declare class IndexPipe {
transform<T>(value: T[], index: number): T;
static ɵpipe: i0.ɵPipeDefWithMeta<IndexPipe, 'index'>;
}
export declare class SlicePipe {
transform<T>(value: ReadonlyArray<T>, start: number, end?: number): Array<T>;
transform(value: string, start: number, end?: number): string;
transform(value: null, start: number, end?: number): null;
transform(value: undefined, start: number, end?: number): undefined;
transform(value: any, start: number, end?: number): any;
static ɵpipe: i0.ɵPipeDefWithMeta<SlicePipe, 'slice'>;
}
export declare class NgForOf<T, U extends i0.NgIterable<T> = i0.NgIterable<T>> implements DoCheck {
ngForOf: (U & i0.NgIterable<T>) | undefined | null;
ngForTemplate: TemplateRef<NgForOfContext<T, U>>;
ngForTrackBy: TrackByFunction<T>;
constructor(_viewContainer: ViewContainerRef, _template: TemplateRef<NgForOfContext<T, U>>, _differs: IterableDiffers);
ngDoCheck(): void;
static ngTemplateContextGuard<T, U extends i0.NgIterable<T>>(dir: NgForOf<T, U>, ctx: any): ctx is NgForOfContext<T, U>;
static ɵdir: i0.ɵɵDirectiveDefWithMeta<NgForOf<any>, '[ngFor][ngForOf]', never, {'ngForOf': 'ngForOf'}, {}, never>;
}
export declare class NgIf<T = unknown> {
ngIf: T;
ngIfElse: TemplateRef<NgIfContext<T>> | null;
ngIfThen: TemplateRef<NgIfContext<T>> | null;
constructor(_viewContainer: ViewContainerRef, templateRef: TemplateRef<NgIfContext<T>>);
static ngTemplateGuard_ngIf: 'binding';
static ngTemplateContextGuard<T>(dir: NgIf<T>, ctx: any): ctx is NgIfContext<Exclude<T, false | 0 | "" | null | undefined>>;
static ɵdir: i0.ɵɵDirectiveDefWithMeta<NgIf<any>, '[ngIf]', never, {'ngIf': 'ngIf'}, {}, never>;
}
export declare class NgIfContext<T = unknown> {
$implicit: T;
ngIf: T;
}
export declare class CommonModule {
static ɵmod: i0.ɵɵNgModuleDefWithMeta<CommonModule, [typeof NgIf, typeof NgForOf, typeof IndexPipe, typeof SlicePipe], never, [typeof NgIf, typeof NgForOf, typeof IndexPipe, typeof SlicePipe]>;
}
`);
env.write('node_modules/@angular/animations/index.d.ts', `
export declare class AnimationEvent {
element: any;
}
`);
});
it('should check a simple component', () => {
env.write('test.ts', `
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: 'I am a simple template with no type info',
})
class TestCmp {}
@NgModule({
declarations: [TestCmp],
})
class Module {}
`);
env.driveMain();
});
it('should check regular attributes that are directive inputs', () => {
env.tsconfig(
{fullTemplateTypeCheck: true, strictInputTypes: true, strictAttributeTypes: true});
env.write('test.ts', `
import {Component, Directive, NgModule, Input} from '@angular/core';
@Component({
selector: 'test',
template: '<div dir foo="2"></div>',
})
class TestCmp {}
@Directive({selector: '[dir]'})
class TestDir {
@Input() foo: number;
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText).toEqual(`Type 'string' is not assignable to type 'number'.`);
// The reported error code should be in the TS error space, not a -99 "NG" code.
expect(diags[0].code).toBeGreaterThan(0);
});
it('should produce diagnostics when mapping to multiple fields and bound types are incorrect',
() => {
env.tsconfig(
{fullTemplateTypeCheck: true, strictInputTypes: true, strictAttributeTypes: true});
env.write('test.ts', `
import {Component, Directive, NgModule, Input} from '@angular/core';
@Component({
selector: 'test',
template: '<div dir foo="2"></div>',
})
class TestCmp {}
@Directive({selector: '[dir]'})
class TestDir {
@Input('foo') foo1: number;
@Input('foo') foo2: number;
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText).toEqual(`Type 'string' is not assignable to type 'number'.`);
expect(diags[1].messageText).toEqual(`Type 'string' is not assignable to type 'number'.`);
});
it('should support inputs and outputs with names that are not JavaScript identifiers', () => {
env.tsconfig(
{fullTemplateTypeCheck: true, strictInputTypes: true, strictOutputEventTypes: true});
env.write('test.ts', `
import {Component, Directive, NgModule, EventEmitter} from '@angular/core';
@Component({
selector: 'test',
template: '<div dir [some-input.xs]="2" (some-output)="handleEvent($event)"></div>',
})
class TestCmp {
handleEvent(event: number): void {}
}
@Directive({
selector: '[dir]',
inputs: ['some-input.xs'],
outputs: ['some-output'],
})
class TestDir {
'some-input.xs': string;
'some-output': EventEmitter<string>;
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText).toEqual(`Type 'number' is not assignable to type 'string'.`);
expect(diags[1].messageText)
.toEqual(`Argument of type 'string' is not assignable to parameter of type 'number'.`);
});
it('should support one input property mapping to multiple fields', () => {
env.write('test.ts', `
import {Component, Directive, Input, NgModule} from '@angular/core';
@Directive({
selector: '[dir]',
})
export class Dir {
@Input('propertyName') fieldA!: string;
@Input('propertyName') fieldB!: string;
}
@Component({
selector: 'test-cmp',
template: '<div dir propertyName="test"></div>',
})
export class Cmp {}
@NgModule({declarations: [Dir, Cmp]})
export class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
it('should check event bindings', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictOutputEventTypes: true});
env.write('test.ts', `
import {Component, Directive, EventEmitter, NgModule, Output} from '@angular/core';
@Component({
selector: 'test',
template: '<div dir (update)="update($event); updated = true" (focus)="update($event); focused = true"></div>',
})
class TestCmp {
update(data: string) {}
}
@Directive({selector: '[dir]'})
class TestDir {
@Output() update = new EventEmitter<number>();
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(3);
expect(diags[0].messageText)
.toEqual(`Argument of type 'number' is not assignable to parameter of type 'string'.`);
expect(diags[1].messageText)
.toEqual(`Property 'updated' does not exist on type 'TestCmp'. Did you mean 'update'?`);
// Disabled because `checkTypeOfDomEvents` is disabled by default
// expect(diags[2].messageText)
// .toEqual(
// `Argument of type 'FocusEvent' is not assignable to parameter of type 'string'.`);
expect(diags[2].messageText).toEqual(`Property 'focused' does not exist on type 'TestCmp'.`);
});
// https://github.com/angular/angular/issues/35073
it('ngIf should narrow on output types', () => {
env.tsconfig({strictTemplates: true});
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngIf="person" (click)="handleEvent(person.name)"></div>',
})
class TestCmp {
person?: { name: string; };
handleEvent(name: string) {}
}
@NgModule({
imports: [CommonModule],
declarations: [TestCmp],
})
class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
it('ngIf should narrow on output types across multiple guards', () => {
env.tsconfig({strictTemplates: true});
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngIf="person"><div *ngIf="person.name" (click)="handleEvent(person.name)"></div></div>',
})
class TestCmp {
person?: { name?: string; };
handleEvent(name: string) {}
}
@NgModule({
imports: [CommonModule],
declarations: [TestCmp],
})
class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
it('should support a directive being used in its own input expression', () => {
env.tsconfig({strictTemplates: true});
env.write('test.ts', `
import {Component, Directive, NgModule, Input} from '@angular/core';
@Component({
selector: 'test',
template: '<target-cmp #ref [foo]="ref.bar"></target-cmp>',
})
export class TestCmp {}
@Component({template: '', selector: 'target-cmp'})
export class TargetCmp {
readonly bar = 'test';
@Input() foo: string;
}
@NgModule({
declarations: [TestCmp, TargetCmp],
})
export class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
describe('strictInputTypes', () => {
beforeEach(() => {
env.write('test.ts', `
import {Component, Directive, NgModule, Input} from '@angular/core';
@Component({
selector: 'test',
template: '<div dir [foo]="invalid && 1"></div>',
})
class TestCmp {}
@Directive({selector: '[dir]'})
class TestDir {
@Input() foo: string;
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
});
it('should check expressions and their type when enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictInputTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText).toEqual(`Type 'number' is not assignable to type 'string'.`);
expect(diags[1].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
it('should check expressions and their type when overall strictness is enabled', () => {
env.tsconfig({strictTemplates: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText).toEqual(`Type 'number' is not assignable to type 'string'.`);
expect(diags[1].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
it('should check expressions but not their type when not enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
});
describe('strictNullInputTypes', () => {
beforeEach(() => {
env.write('test.ts', `
import {Component, Directive, NgModule, Input} from '@angular/core';
@Component({
selector: 'test',
template: '<div dir [foo]="invalid && nullable"></div>',
})
class TestCmp {
nullable: string | null | undefined;
}
@Directive({selector: '[dir]'})
class TestDir {
@Input() foo: string;
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
});
it('should check expressions and their nullability when enabled', () => {
env.tsconfig(
{fullTemplateTypeCheck: true, strictInputTypes: true, strictNullInputTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect((diags[0].messageText as ts.DiagnosticMessageChain).messageText)
.toEqual(`Type 'string | null | undefined' is not assignable to type 'string'.`);
expect(diags[1].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
it('should check expressions and their nullability when overall strictness is enabled',
() => {
env.tsconfig({strictTemplates: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect((diags[0].messageText as ts.DiagnosticMessageChain).messageText)
.toEqual(`Type 'string | null | undefined' is not assignable to type 'string'.`);
expect(diags[1].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
it('should check expressions but not their nullability when not enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictInputTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
});
describe('strictSafeNavigationTypes', () => {
beforeEach(() => {
env.write('test.ts', `
import {Component, Directive, NgModule, Input} from '@angular/core';
@Component({
selector: 'test',
template: '<div dir [foo]="invalid && user?.name"></div>',
})
class TestCmp {
user?: {name: string};
}
@Directive({selector: '[dir]'})
class TestDir {
@Input() foo: string;
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
});
it('should infer result type for safe navigation expressions when enabled', () => {
env.tsconfig({
fullTemplateTypeCheck: true,
strictInputTypes: true,
strictNullInputTypes: true,
strictSafeNavigationTypes: true
});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect((diags[0].messageText as ts.DiagnosticMessageChain).messageText)
.toEqual(`Type 'string | undefined' is not assignable to type 'string'.`);
expect(diags[1].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
it('should infer result type for safe navigation expressions when overall strictness is enabled',
() => {
env.tsconfig({strictTemplates: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect((diags[0].messageText as ts.DiagnosticMessageChain).messageText)
.toEqual(`Type 'string | undefined' is not assignable to type 'string'.`);
expect(diags[1].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
it('should not infer result type for safe navigation expressions when not enabled', () => {
env.tsconfig({
fullTemplateTypeCheck: true,
strictInputTypes: true,
});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
});
describe('strictOutputEventTypes', () => {
beforeEach(() => {
env.write('test.ts', `
import {Component, Directive, EventEmitter, NgModule, Output} from '@angular/core';
@Component({
selector: 'test',
template: '<div dir (update)="invalid && update($event);"></div>',
})
class TestCmp {
update(data: string) {}
}
@Directive({selector: '[dir]'})
class TestDir {
@Output() update = new EventEmitter<number>();
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
});
it('should expressions and infer type of $event when enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictOutputEventTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
expect(diags[1].messageText)
.toEqual(`Argument of type 'number' is not assignable to parameter of type 'string'.`);
});
it('should expressions and infer type of $event when overall strictness is enabled', () => {
env.tsconfig({strictTemplates: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
expect(diags[1].messageText)
.toEqual(`Argument of type 'number' is not assignable to parameter of type 'string'.`);
});
it('should check expressions but not infer type of $event when not enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
});
describe('strictOutputEventTypes and animation event bindings', () => {
beforeEach(() => {
env.write('test.ts', `
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div (@animation.done)="invalid; update($event);"></div>',
})
class TestCmp {
update(data: string) {}
}
@NgModule({
declarations: [TestCmp],
})
class Module {}
`);
});
it('should check expressions and let $event be of type AnimationEvent when enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictOutputEventTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
expect(diags[1].messageText)
.toEqual(
`Argument of type 'AnimationEvent' is not assignable to parameter of type 'string'.`);
});
it('should check expressions and let $event be of type AnimationEvent when overall strictness is enabled',
() => {
env.tsconfig({strictTemplates: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
expect(diags[1].messageText)
.toEqual(
`Argument of type 'AnimationEvent' is not assignable to parameter of type 'string'.`);
});
it('should check expressions and let $event be of type any when not enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
});
describe('strictDomLocalRefTypes', () => {
beforeEach(() => {
env.write('test.ts', `
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<input #ref>{{ref.does_not_exist}}',
})
class TestCmp {}
@NgModule({
declarations: [TestCmp],
})
class Module {}
`);
});
it('should infer the type of DOM references when enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictDomLocalRefTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'does_not_exist' does not exist on type 'HTMLInputElement'.`);
});
it('should infer the type of DOM references when overall strictness is enabled', () => {
env.tsconfig({strictTemplates: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'does_not_exist' does not exist on type 'HTMLInputElement'.`);
});
it('should let the type of DOM references be any when not enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
});
describe('strictAttributeTypes', () => {
beforeEach(() => {
env.write('test.ts', `
import {Component, Directive, NgModule, Input} from '@angular/core';
@Component({
selector: 'test',
template: '<textarea dir disabled cols="3"></textarea>',
})
class TestCmp {}
@Directive({selector: '[dir]'})
class TestDir {
@Input() disabled: boolean;
@Input() cols: number;
}
@NgModule({
declarations: [TestCmp, TestDir],
})
class Module {}
`);
});
it('should produce an error for text attributes when enabled', () => {
env.tsconfig(
{fullTemplateTypeCheck: true, strictInputTypes: true, strictAttributeTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText).toEqual(`Type 'string' is not assignable to type 'boolean'.`);
expect(diags[1].messageText).toEqual(`Type 'string' is not assignable to type 'number'.`);
});
it('should produce an error for text attributes when overall strictness is enabled', () => {
env.tsconfig({strictTemplates: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText).toEqual(`Type 'string' is not assignable to type 'boolean'.`);
expect(diags[1].messageText).toEqual(`Type 'string' is not assignable to type 'number'.`);
});
it('should not produce an error for text attributes when not enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictInputTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
});
describe('strictDomEventTypes', () => {
beforeEach(() => {
env.write('test.ts', `
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div (focus)="invalid; update($event)"></div>',
})
class TestCmp {
update(data: string) {}
}
@NgModule({
declarations: [TestCmp],
})
class Module {}
`);
});
it('should check expressions and infer type of $event when enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictDomEventTypes: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
expect(diags[1].messageText)
.toEqual(
`Argument of type 'FocusEvent' is not assignable to parameter of type 'string'.`);
});
it('should check expressions and infer type of $event when overall strictness is enabled',
() => {
env.tsconfig({strictTemplates: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(2);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
expect(diags[1].messageText)
.toEqual(
`Argument of type 'FocusEvent' is not assignable to parameter of type 'string'.`);
});
it('should check expressions but not infer type of $event when not enabled', () => {
env.tsconfig({fullTemplateTypeCheck: true});
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'invalid' does not exist on type 'TestCmp'.`);
});
});
it('should check basic usage of NgIf', () => {
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngIf="user">{{user.name}}</div>',
})
class TestCmp {
user: {name: string}|null;
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
class Module {}
`);
env.driveMain();
});
it('should check usage of NgIf with explicit non-null guard', () => {
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngIf="user !== null">{{user.name}}</div>',
})
class TestCmp {
user: {name: string}|null;
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
class Module {}
`);
env.driveMain();
});
it('should check usage of NgIf when using "let" to capture $implicit context variable', () => {
env.tsconfig({strictTemplates: true});
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngIf="user; let u">{{u.name}}</div>',
})
class TestCmp {
user: {name: string}|null|false;
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
class Module {}
`);
env.driveMain();
});
it('should check usage of NgIf when using "as" to capture `ngIf` context variable', () => {
env.tsconfig({strictTemplates: true});
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngIf="user as u">{{u.name}}</div>',
})
class TestCmp {
user: {name: string}|null|false;
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
class Module {}
`);
env.driveMain();
});
it('should check basic usage of NgFor', () => {
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngFor="let user of users">{{user.name}}</div>',
})
class TestCmp {
users: {name: string}[];
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
class Module {}
`);
env.driveMain();
});
it('should report an error inside the NgFor template', () => {
env.tsconfig({fullTemplateTypeCheck: true, strictInputTypes: true});
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngFor="let user of users">{{user.does_not_exist}}</div>',
})
export class TestCmp {
users: {name: string}[];
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
export class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect(diags[0].messageText)
.toEqual(`Property 'does_not_exist' does not exist on type '{ name: string; }'.`);
expect(getSourceCodeForDiagnostic(diags[0])).toBe('does_not_exist');
});
it('should accept an NgFor iteration over an any-typed value', () => {
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngFor="let user of users">{{user.name}}</div>',
})
export class TestCmp {
users: any;
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
export class Module {}
`);
env.driveMain();
});
it('should accept NgFor iteration over a QueryList', () => {
env.tsconfig({strictTemplates: true});
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule, QueryList} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngFor="let user of users">{{user.name}}</div>',
})
class TestCmp {
users!: QueryList<{name: string}>;
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
class Module {}
`);
env.driveMain();
});
it('should infer the context of NgFor', () => {
env.tsconfig({strictTemplates: true});
env.write('test.ts', `
import {CommonModule} from '@angular/common';
import {Component, NgModule} from '@angular/core';
@Component({
selector: 'test',
template: '<div *ngFor="let user of users as all">{{all.length}}</div>',
})
class TestCmp {
users: {name: string}[];
}