55 lines
2.0 KiB
TypeScript
55 lines
2.0 KiB
TypeScript
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Type} from '../type';
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interface TypeWithMetadata extends Type<any> {
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decorators?: any[];
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ctorParameters?: any[];
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propDecorators?: {[field: string]: any};
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}
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/**
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* Adds decorator, constructor, and property metadata to a given type via static metadata fields
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* on the type.
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*
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* These metadata fields can later be read with Angular's `ReflectionCapabilities` API.
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*
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* Calls to `setClassMetadata` can be marked as pure, resulting in the metadata assignments being
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* tree-shaken away during production builds.
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*/
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export function setClassMetadata(
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type: Type<any>, decorators: any[] | null, ctorParameters: any[] | null,
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propDecorators: {[field: string]: any} | null): void {
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const clazz = type as TypeWithMetadata;
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if (decorators !== null) {
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if (clazz.decorators !== undefined) {
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clazz.decorators.push(...decorators);
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} else {
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clazz.decorators = decorators;
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}
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}
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if (ctorParameters !== null) {
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// Rather than merging, clobber the existing parameters. If other projects exist which use
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// tsickle-style annotations and reflect over them in the same way, this could cause issues,
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// but that is vanishingly unlikely.
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clazz.ctorParameters = ctorParameters;
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}
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if (propDecorators !== null) {
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// The property decorator objects are merged as it is possible different fields have different
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// decorator types. Decorators on individual fields are not merged, as it's also incredibly
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// unlikely that a field will be decorated both with an Angular decorator and a non-Angular
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// decorator that's also been downleveled.
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if (clazz.propDecorators !== undefined) {
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clazz.propDecorators = {...clazz.propDecorators, ...propDecorators};
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} else {
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clazz.propDecorators = propDecorators;
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}
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}
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}
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