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fix(common): reflect input type in NgForOf context (#33997) 

Fixes `NgForOf` not reflecting the type of its input in the `NgForOfContext`.

PR Close #33997
This commit is contained in:
crisbeto 2019-11-28 19:42:00 +01:00 committed by Miško Hevery
parent e6dbcd0f46
commit a6b6d74c00
5 changed files with 98 additions and 68 deletions
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41
packages/common/src/directives/ng_for_of.ts
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@ -6,15 +6,13 @@
* found in the LICENSE file at https://angular.io/license
*/
import {Directive, DoCheck, EmbeddedViewRef, Input, IterableChangeRecord, IterableChanges, IterableDiffer, IterableDiffers, NgIterable, TemplateRef, TrackByFunction, ViewContainerRef, forwardRef, isDevMode} from '@angular/core';
import {Directive, DoCheck, EmbeddedViewRef, Input, IterableChangeRecord, IterableChanges, IterableDiffer, IterableDiffers, NgIterable, TemplateRef, TrackByFunction, ViewContainerRef, isDevMode} from '@angular/core';
/**
* @publicApi
*/
export class NgForOfContext<T> {
constructor(
public $implicit: T, public ngForOf: NgIterable<T>, public index: number,
public count: number) {}
export class NgForOfContext<T, U extends NgIterable<T>> {
constructor(public $implicit: T, public ngForOf: U, public index: number, public count: number) {}
get first(): boolean { return this.index === 0; }
@ -123,13 +121,13 @@ export class NgForOfContext<T> {
* @publicApi
*/
@Directive({selector: '[ngFor][ngForOf]'})
export class NgForOf<T> implements DoCheck {
export class NgForOf<T, U extends NgIterable<T>> implements DoCheck {
/**
* The value of the iterable expression, which can be used as a
* [template input variable](guide/structural-directives#template-input-variable).
*/
@Input()
set ngForOf(ngForOf: NgIterable<T>|undefined|null) {
set ngForOf(ngForOf: U&NgIterable<T>|undefined|null) {
this._ngForOf = ngForOf;
this._ngForOfDirty = true;
}
@ -165,22 +163,22 @@ export class NgForOf<T> implements DoCheck {
get ngForTrackBy(): TrackByFunction<T> { return this._trackByFn; }
private _ngForOf: NgIterable<T>|undefined|null = null;
private _ngForOf: U|undefined|null = null;
private _ngForOfDirty: boolean = true;
private _differ: IterableDiffer<T>|null = null;
// TODO(issue/24571): remove '!'.
private _trackByFn !: TrackByFunction<T>;
constructor(
private _viewContainer: ViewContainerRef, private _template: TemplateRef<NgForOfContext<T>>,
private _differs: IterableDiffers) {}
private _viewContainer: ViewContainerRef,
private _template: TemplateRef<NgForOfContext<T, U>>, private _differs: IterableDiffers) {}
/**
* A reference to the template that is stamped out for each item in the iterable.
* @see [template reference variable](guide/template-syntax#template-reference-variables--var-)
*/
@Input()
set ngForTemplate(value: TemplateRef<NgForOfContext<T>>) {
set ngForTemplate(value: TemplateRef<NgForOfContext<T, U>>) {
// TODO(TS2.1): make TemplateRef<Partial<NgForRowOf<T>>> once we move to TS v2.1
// The current type is too restrictive; a template that just uses index, for example,
// should be acceptable.
@ -213,7 +211,7 @@ export class NgForOf<T> implements DoCheck {
}
private _applyChanges(changes: IterableChanges<T>) {
const insertTuples: RecordViewTuple<T>[] = [];
const insertTuples: RecordViewTuple<T, U>[] = [];
changes.forEachOperation(
(item: IterableChangeRecord<any>, adjustedPreviousIndex: number | null,
currentIndex: number | null) => {
@ -222,9 +220,9 @@ export class NgForOf<T> implements DoCheck {
// that a new item needs to be inserted from the iterable. This implies that
// there is an iterable value for "_ngForOf".
const view = this._viewContainer.createEmbeddedView(
this._template, new NgForOfContext<T>(null !, this._ngForOf !, -1, -1),
this._template, new NgForOfContext<T, U>(null !, this._ngForOf !, -1, -1),
currentIndex === null ? undefined : currentIndex);
const tuple = new RecordViewTuple<T>(item, view);
const tuple = new RecordViewTuple<T, U>(item, view);
insertTuples.push(tuple);
} else if (currentIndex == null) {
this._viewContainer.remove(
@ -232,7 +230,7 @@ export class NgForOf<T> implements DoCheck {
} else if (adjustedPreviousIndex !== null) {
const view = this._viewContainer.get(adjustedPreviousIndex) !;
this._viewContainer.move(view, currentIndex);
const tuple = new RecordViewTuple(item, <EmbeddedViewRef<NgForOfContext<T>>>view);
const tuple = new RecordViewTuple(item, <EmbeddedViewRef<NgForOfContext<T, U>>>view);
insertTuples.push(tuple);
}
});
@ -242,7 +240,7 @@ export class NgForOf<T> implements DoCheck {
}
for (let i = 0, ilen = this._viewContainer.length; i < ilen; i++) {
const viewRef = <EmbeddedViewRef<NgForOfContext<T>>>this._viewContainer.get(i);
const viewRef = <EmbeddedViewRef<NgForOfContext<T, U>>>this._viewContainer.get(i);
viewRef.context.index = i;
viewRef.context.count = ilen;
viewRef.context.ngForOf = this._ngForOf !;
@ -250,13 +248,13 @@ export class NgForOf<T> implements DoCheck {
changes.forEachIdentityChange((record: any) => {
const viewRef =
<EmbeddedViewRef<NgForOfContext<T>>>this._viewContainer.get(record.currentIndex);
<EmbeddedViewRef<NgForOfContext<T, U>>>this._viewContainer.get(record.currentIndex);
viewRef.context.$implicit = record.item;
});
}
private _perViewChange(
view: EmbeddedViewRef<NgForOfContext<T>>, record: IterableChangeRecord<any>) {
view: EmbeddedViewRef<NgForOfContext<T, U>>, record: IterableChangeRecord<any>) {
view.context.$implicit = record.item;
}
@ -266,13 +264,14 @@ export class NgForOf<T> implements DoCheck {
* The presence of this method is a signal to the Ivy template type-check compiler that the
* `NgForOf` structural directive renders its template with a specific context type.
*/
static ngTemplateContextGuard<T>(dir: NgForOf<T>, ctx: any): ctx is NgForOfContext<T> {
static ngTemplateContextGuard<T, U extends NgIterable<T>>(dir: NgForOf<T, U>, ctx: any):
ctx is NgForOfContext<T, U> {
return true;
}
}
class RecordViewTuple<T> {
constructor(public record: any, public view: EmbeddedViewRef<NgForOfContext<T>>) {}
class RecordViewTuple<T, U extends NgIterable<T>> {
constructor(public record: any, public view: EmbeddedViewRef<NgForOfContext<T, U>>) {}
}
function getTypeName(type: any): string {

52
packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts
View File

@ -26,15 +26,16 @@ runInEachFileSystem(() => {
env.write('node_modules/@angular/common/index.d.ts', `
import * as i0 from '@angular/core';
export declare class NgForOfContext<T> {
export declare class NgForOfContext<T, U extends NgIterable<T>> {
$implicit: T;
ngForOf: i0.NgIterable<T>;
index: number;
count: number;
readonly first: boolean;
readonly last: boolean;
readonly even: boolean;
readonly first: boolean;
index: number;
readonly last: boolean;
ngForOf: U;
readonly odd: boolean;
constructor($implicit: T, ngForOf: U, index: number, count: number);
}
export declare class IndexPipe {
@ -53,9 +54,13 @@ export declare class SlicePipe {
static ɵpipe: i0.ɵPipeDefWithMeta<SlicePipe, 'slice'>;
}
export declare class NgForOf<T> {
ngForOf: i0.NgIterable<T>;
static ngTemplateContextGuard<T>(dir: NgForOf<T>, ctx: any): ctx is NgForOfContext<T>;
export declare class NgForOf<T, U extends 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>;
}
@ -785,6 +790,31 @@ export declare class AnimationEvent {
env.driveMain();
});
it('should infer the context of NgFor', () => {
env.tsconfig({fullTemplateTypeCheck: true, 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}[];
}
@NgModule({
declarations: [TestCmp],
imports: [CommonModule],
})
class Module {}
`);
const diags = env.driveDiagnostics();
expect(diags.length).toBe(0);
});
it('should report an error with an unknown local ref target', () => {
env.write('test.ts', `
import {Component, NgModule} from '@angular/core';
@ -919,7 +949,7 @@ export declare class AnimationEvent {
@Component({
selector: 'test',
template: \`<div *ngFor="let foo of foos as foos">
{{foo.name}} of {{foos.length}}
{{foo.name}} of {{foos.nonExistingProp}}
</div>
\`,
})
@ -947,8 +977,8 @@ export declare class AnimationEvent {
const diags = env.driveDiagnostics();
expect(diags.length).toBe(1);
expect((diags[0].messageText as ts.DiagnosticMessageChain).messageText)
.toBe(`Property 'length' does not exist on type 'NgIterable<{ name: string; }>'.`);
expect(diags[0].messageText)
.toBe(`Property 'nonExistingProp' does not exist on type '{ name: string; }[]'.`);
});
});

4
packages/core/test/render3/common_with_def.ts
View File

@ -7,11 +7,11 @@
*/
import {NgForOf as NgForOfDef, NgIf as NgIfDef, NgTemplateOutlet as NgTemplateOutletDef} from '@angular/common';
import {IterableDiffers, TemplateRef, ViewContainerRef} from '@angular/core';
import {IterableDiffers, NgIterable, TemplateRef, ViewContainerRef} from '@angular/core';
import {DirectiveType, ɵɵNgOnChangesFeature, ɵɵdefineDirective, ɵɵdirectiveInject} from '../../src/render3/index';
export const NgForOf: DirectiveType<NgForOfDef<any>> = NgForOfDef as any;
export const NgForOf: DirectiveType<NgForOfDef<any, NgIterable<any>>> = NgForOfDef as any;
export const NgIf: DirectiveType<NgIfDef> = NgIfDef as any;
export const NgTemplateOutlet: DirectiveType<NgTemplateOutletDef> = NgTemplateOutletDef as any;

5
packages/core/test/render3/instructions_spec.ts
View File

@ -205,7 +205,8 @@ describe('instructions', () => {
describe('performance counters', () => {
it('should create tViews only once for each nested level', () => {
function ToDoAppComponent_NgForOf_Template_0(rf: RenderFlags, ctx0: NgForOfContext<any>) {
function ToDoAppComponent_NgForOf_Template_0(
rf: RenderFlags, ctx0: NgForOfContext<any, any>) {
if (rf & RenderFlags.Create) {
ɵɵelementStart(0, 'ul');
ɵɵtemplate(1, ToDoAppComponent_NgForOf_NgForOf_Template_1, 2, 1, 'li', 0);
@ -219,7 +220,7 @@ describe('instructions', () => {
}
function ToDoAppComponent_NgForOf_NgForOf_Template_1(
rf: RenderFlags, ctx1: NgForOfContext<any>) {
rf: RenderFlags, ctx1: NgForOfContext<any, any>) {
if (rf & RenderFlags.Create) {
ɵɵelementStart(0, 'li');
ɵɵtext(1);

16
tools/public_api_guard/common/common.d.ts vendored
View File

@ -214,25 +214,25 @@ export declare class NgComponentOutlet implements OnChanges, OnDestroy {
ngOnDestroy(): void;
}
export declare class NgForOf<T> implements DoCheck {
ngForOf: NgIterable<T> | undefined | null;
ngForTemplate: TemplateRef<NgForOfContext<T>>;
export declare class NgForOf<T, U extends NgIterable<T>> implements DoCheck {
ngForOf: (U & NgIterable<T>) | undefined | null;
ngForTemplate: TemplateRef<NgForOfContext<T, U>>;
ngForTrackBy: TrackByFunction<T>;
constructor(_viewContainer: ViewContainerRef, _template: TemplateRef<NgForOfContext<T>>, _differs: IterableDiffers);
constructor(_viewContainer: ViewContainerRef, _template: TemplateRef<NgForOfContext<T, U>>, _differs: IterableDiffers);
ngDoCheck(): void;
static ngTemplateContextGuard<T>(dir: NgForOf<T>, ctx: any): ctx is NgForOfContext<T>;
static ngTemplateContextGuard<T, U extends NgIterable<T>>(dir: NgForOf<T, U>, ctx: any): ctx is NgForOfContext<T, U>;
}
export declare class NgForOfContext<T> {
export declare class NgForOfContext<T, U extends NgIterable<T>> {
$implicit: T;
count: number;
readonly even: boolean;
readonly first: boolean;
index: number;
readonly last: boolean;
ngForOf: NgIterable<T>;
ngForOf: U;
readonly odd: boolean;
constructor($implicit: T, ngForOf: NgIterable<T>, index: number, count: number);
constructor($implicit: T, ngForOf: U, index: number, count: number);
}
export declare class NgIf {