ng-track-by/esm2015/lib/track-by.directive.js

trackBy and trackById directives which provide TrackByFunction to ngForTrackBy

import { CommonModule } from "@angular/common";
import { Input, NgModule } from "@angular/core";
import { Directive } from "@angular/core";
import { not } from "logical-not";
import { changeTrackBy } from "./tools/change-track-by";
import { marked } from "./tools/marker";
import * as i0 from "@angular/core";
import * as i1 from "@angular/common";
export class TrackByDirective {
    constructor(ngForOf) {
        this.ngForOf = ngForOf;
    }
    ngOnInit() {
        if (not(marked(this.ngForOf)))
            changeTrackBy(this.ngForOf, this.createTrackByFn(), this.trackBy);
    }
    createTrackByFn() {
        const key = this.trackBy;
        return function (_, item) {
            return item[key];
        };
    }
}
TrackByDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByDirective, deps: [{ token: i1.NgForOf }], target: i0.ɵɵFactoryTarget.Directive });
TrackByDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "12.2.0", type: TrackByDirective, selector: "[trackBy]", inputs: { trackBy: "trackBy" }, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByDirective, decorators: [{
            type: Directive,
            args: [{
                    selector: "[trackBy]",
                }]
        }], ctorParameters: function () { return [{ type: i1.NgForOf }]; }, propDecorators: { trackBy: [{
                type: Input
            }] } });
export class TrackByModule {
}
TrackByModule.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
TrackByModule.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByModule, declarations: [TrackByDirective], imports: [CommonModule], exports: [TrackByDirective] });
TrackByModule.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByModule, imports: [[CommonModule]] });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByModule, decorators: [{
            type: NgModule,
            args: [{
                    imports: [CommonModule],
                    exports: [TrackByDirective],
                    declarations: [TrackByDirective],
                }]
        }] });
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