@angular/core
Version:
Angular - the core framework
126 lines • 20.5 kB
JavaScript
/**
* @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 { noSideEffects } from './closure';
export const ANNOTATIONS = '__annotations__';
export const PARAMETERS = '__parameters__';
export const PROP_METADATA = '__prop__metadata__';
/**
* @suppress {globalThis}
*/
export function makeDecorator(name, props, parentClass, additionalProcessing, typeFn) {
return noSideEffects(() => {
const metaCtor = makeMetadataCtor(props);
function DecoratorFactory(...args) {
if (this instanceof DecoratorFactory) {
metaCtor.call(this, ...args);
return this;
}
const annotationInstance = new DecoratorFactory(...args);
return function TypeDecorator(cls) {
if (typeFn)
typeFn(cls, ...args);
// Use of Object.defineProperty is important since it creates non-enumerable property which
// prevents the property is copied during subclassing.
const annotations = cls.hasOwnProperty(ANNOTATIONS)
? cls[ANNOTATIONS]
: Object.defineProperty(cls, ANNOTATIONS, { value: [] })[ANNOTATIONS];
annotations.push(annotationInstance);
if (additionalProcessing)
additionalProcessing(cls);
return cls;
};
}
if (parentClass) {
DecoratorFactory.prototype = Object.create(parentClass.prototype);
}
DecoratorFactory.prototype.ngMetadataName = name;
DecoratorFactory.annotationCls = DecoratorFactory;
return DecoratorFactory;
});
}
function makeMetadataCtor(props) {
return function ctor(...args) {
if (props) {
const values = props(...args);
for (const propName in values) {
this[propName] = values[propName];
}
}
};
}
export function makeParamDecorator(name, props, parentClass) {
return noSideEffects(() => {
const metaCtor = makeMetadataCtor(props);
function ParamDecoratorFactory(...args) {
if (this instanceof ParamDecoratorFactory) {
metaCtor.apply(this, args);
return this;
}
const annotationInstance = new ParamDecoratorFactory(...args);
ParamDecorator.annotation = annotationInstance;
return ParamDecorator;
function ParamDecorator(cls, unusedKey, index) {
// Use of Object.defineProperty is important since it creates non-enumerable property which
// prevents the property is copied during subclassing.
const parameters = cls.hasOwnProperty(PARAMETERS)
? cls[PARAMETERS]
: Object.defineProperty(cls, PARAMETERS, { value: [] })[PARAMETERS];
// there might be gaps if some in between parameters do not have annotations.
// we pad with nulls.
while (parameters.length <= index) {
parameters.push(null);
}
(parameters[index] = parameters[index] || []).push(annotationInstance);
return cls;
}
}
if (parentClass) {
ParamDecoratorFactory.prototype = Object.create(parentClass.prototype);
}
ParamDecoratorFactory.prototype.ngMetadataName = name;
ParamDecoratorFactory.annotationCls = ParamDecoratorFactory;
return ParamDecoratorFactory;
});
}
export function makePropDecorator(name, props, parentClass, additionalProcessing) {
return noSideEffects(() => {
const metaCtor = makeMetadataCtor(props);
function PropDecoratorFactory(...args) {
if (this instanceof PropDecoratorFactory) {
metaCtor.apply(this, args);
return this;
}
const decoratorInstance = new PropDecoratorFactory(...args);
function PropDecorator(target, name) {
// target is undefined with standard decorators. This case is not supported and will throw
// if this decorator is used in JIT mode with standard decorators.
if (target === undefined) {
throw new Error('Standard Angular field decorators are not supported in JIT mode.');
}
const constructor = target.constructor;
// Use of Object.defineProperty is important because it creates a non-enumerable property
// which prevents the property from being copied during subclassing.
const meta = constructor.hasOwnProperty(PROP_METADATA)
? constructor[PROP_METADATA]
: Object.defineProperty(constructor, PROP_METADATA, { value: {} })[PROP_METADATA];
meta[name] = (meta.hasOwnProperty(name) && meta[name]) || [];
meta[name].unshift(decoratorInstance);
if (additionalProcessing)
additionalProcessing(target, name, ...args);
}
return PropDecorator;
}
if (parentClass) {
PropDecoratorFactory.prototype = Object.create(parentClass.prototype);
}
PropDecoratorFactory.prototype.ngMetadataName = name;
PropDecoratorFactory.annotationCls = PropDecoratorFactory;
return PropDecoratorFactory;
});
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Type} from '../interface/type';\n\nimport {noSideEffects} from './closure';\n\n/**\n * An interface implemented by all Angular type decorators, which allows them to be used as\n * decorators as well as Angular syntax.\n *\n * ```\n * @ng.Component({...})\n * class MyClass {...}\n * ```\n *\n * @publicApi\n */\nexport interface TypeDecorator {\n  /**\n   * Invoke as decorator.\n   */\n  <T extends Type<any>>(type: T): T;\n\n  // Make TypeDecorator assignable to built-in ParameterDecorator type.\n  // ParameterDecorator is declared in lib.d.ts as a `declare type`\n  // so we cannot declare this interface as a subtype.\n  // see https://github.com/angular/angular/issues/3379#issuecomment-126169417\n  (target: Object, propertyKey?: string | symbol, parameterIndex?: number): void;\n  // Standard (non-experimental) Decorator signature that avoids direct usage of\n  // any TS 5.0+ specific types.\n  (target: unknown, context: unknown): void;\n}\n\nexport const ANNOTATIONS = '__annotations__';\nexport const PARAMETERS = '__parameters__';\nexport const PROP_METADATA = '__prop__metadata__';\n\n/**\n * @suppress {globalThis}\n */\nexport function makeDecorator<T>(\n  name: string,\n  props?: (...args: any[]) => any,\n  parentClass?: any,\n  additionalProcessing?: (type: Type<T>) => void,\n  typeFn?: (type: Type<T>, ...args: any[]) => void,\n): {new (...args: any[]): any; (...args: any[]): any; (...args: any[]): (cls: any) => any} {\n  return noSideEffects(() => {\n    const metaCtor = makeMetadataCtor(props);\n\n    function DecoratorFactory(\n      this: unknown | typeof DecoratorFactory,\n      ...args: any[]\n    ): (cls: Type<T>) => any {\n      if (this instanceof DecoratorFactory) {\n        metaCtor.call(this, ...args);\n        return this as typeof DecoratorFactory;\n      }\n\n      const annotationInstance = new (DecoratorFactory as any)(...args);\n      return function TypeDecorator(cls: Type<T>) {\n        if (typeFn) typeFn(cls, ...args);\n        // Use of Object.defineProperty is important since it creates non-enumerable property which\n        // prevents the property is copied during subclassing.\n        const annotations = cls.hasOwnProperty(ANNOTATIONS)\n          ? (cls as any)[ANNOTATIONS]\n          : (Object.defineProperty(cls, ANNOTATIONS, {value: []}) as any)[ANNOTATIONS];\n        annotations.push(annotationInstance);\n\n        if (additionalProcessing) additionalProcessing(cls);\n\n        return cls;\n      };\n    }\n\n    if (parentClass) {\n      DecoratorFactory.prototype = Object.create(parentClass.prototype);\n    }\n\n    DecoratorFactory.prototype.ngMetadataName = name;\n    (DecoratorFactory as any).annotationCls = DecoratorFactory;\n    return DecoratorFactory as any;\n  });\n}\n\nfunction makeMetadataCtor(props?: (...args: any[]) => any): any {\n  return function ctor(this: any, ...args: any[]) {\n    if (props) {\n      const values = props(...args);\n      for (const propName in values) {\n        this[propName] = values[propName];\n      }\n    }\n  };\n}\n\nexport function makeParamDecorator(\n  name: string,\n  props?: (...args: any[]) => any,\n  parentClass?: any,\n): any {\n  return noSideEffects(() => {\n    const metaCtor = makeMetadataCtor(props);\n    function ParamDecoratorFactory(\n      this: unknown | typeof ParamDecoratorFactory,\n      ...args: any[]\n    ): any {\n      if (this instanceof ParamDecoratorFactory) {\n        metaCtor.apply(this, args);\n        return this;\n      }\n      const annotationInstance = new (<any>ParamDecoratorFactory)(...args);\n\n      (<any>ParamDecorator).annotation = annotationInstance;\n      return ParamDecorator;\n\n      function ParamDecorator(cls: any, unusedKey: any, index: number): any {\n        // Use of Object.defineProperty is important since it creates non-enumerable property which\n        // prevents the property is copied during subclassing.\n        const parameters = cls.hasOwnProperty(PARAMETERS)\n          ? (cls as any)[PARAMETERS]\n          : Object.defineProperty(cls, PARAMETERS, {value: []})[PARAMETERS];\n\n        // there might be gaps if some in between parameters do not have annotations.\n        // we pad with nulls.\n        while (parameters.length <= index) {\n          parameters.push(null);\n        }\n\n        (parameters[index] = parameters[index] || []).push(annotationInstance);\n        return cls;\n      }\n    }\n    if (parentClass) {\n      ParamDecoratorFactory.prototype = Object.create(parentClass.prototype);\n    }\n    ParamDecoratorFactory.prototype.ngMetadataName = name;\n    (<any>ParamDecoratorFactory).annotationCls = ParamDecoratorFactory;\n    return ParamDecoratorFactory;\n  });\n}\n\nexport function makePropDecorator(\n  name: string,\n  props?: (...args: any[]) => any,\n  parentClass?: any,\n  additionalProcessing?: (target: any, name: string, ...args: any[]) => void,\n): any {\n  return noSideEffects(() => {\n    const metaCtor = makeMetadataCtor(props);\n\n    function PropDecoratorFactory(\n      this: unknown | typeof PropDecoratorFactory,\n      ...args: any[]\n    ): any {\n      if (this instanceof PropDecoratorFactory) {\n        metaCtor.apply(this, args);\n        return this;\n      }\n\n      const decoratorInstance = new (<any>PropDecoratorFactory)(...args);\n\n      function PropDecorator(target: any, name: string) {\n        // target is undefined with standard decorators. This case is not supported and will throw\n        // if this decorator is used in JIT mode with standard decorators.\n        if (target === undefined) {\n          throw new Error('Standard Angular field decorators are not supported in JIT mode.');\n        }\n\n        const constructor = target.constructor;\n        // Use of Object.defineProperty is important because it creates a non-enumerable property\n        // which prevents the property from being copied during subclassing.\n        const meta = constructor.hasOwnProperty(PROP_METADATA)\n          ? (constructor as any)[PROP_METADATA]\n          : Object.defineProperty(constructor, PROP_METADATA, {value: {}})[PROP_METADATA];\n        meta[name] = (meta.hasOwnProperty(name) && meta[name]) || [];\n        meta[name].unshift(decoratorInstance);\n\n        if (additionalProcessing) additionalProcessing(target, name, ...args);\n      }\n\n      return PropDecorator;\n    }\n\n    if (parentClass) {\n      PropDecoratorFactory.prototype = Object.create(parentClass.prototype);\n    }\n\n    PropDecoratorFactory.prototype.ngMetadataName = name;\n    (<any>PropDecoratorFactory).annotationCls = PropDecoratorFactory;\n    return PropDecoratorFactory;\n  });\n}\n"]}