@angular/core
Version:
Angular - the core framework
283 lines • 45.2 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 { getCompilerFacade } from '../../compiler/compiler_facade';
import { resolveForwardRef } from '../../di/forward_ref';
import { getReflect, reflectDependencies } from '../../di/jit/util';
import { componentNeedsResolution, maybeQueueResolutionOfComponentResources } from '../../metadata/resource_loading';
import { ViewEncapsulation } from '../../metadata/view';
import { initNgDevMode } from '../../util/ng_dev_mode';
import { getComponentDef, getDirectiveDef } from '../definition';
import { EMPTY_ARRAY, EMPTY_OBJ } from '../empty';
import { NG_COMP_DEF, NG_DIR_DEF, NG_FACTORY_DEF } from '../fields';
import { stringifyForError } from '../util/misc_utils';
import { angularCoreEnv } from './environment';
import { getJitOptions } from './jit_options';
import { flushModuleScopingQueueAsMuchAsPossible, patchComponentDefWithScope, transitiveScopesFor } from './module';
/**
* Compile an Angular component according to its decorator metadata, and patch the resulting
* component def (ɵcmp) onto the component type.
*
* Compilation may be asynchronous (due to the need to resolve URLs for the component template or
* other resources, for example). In the event that compilation is not immediate, `compileComponent`
* will enqueue resource resolution into a global queue and will fail to return the `ɵcmp`
* until the global queue has been resolved with a call to `resolveComponentResources`.
*/
export function compileComponent(type, metadata) {
// Initialize ngDevMode. This must be the first statement in compileComponent.
// See the `initNgDevMode` docstring for more information.
(typeof ngDevMode === 'undefined' || ngDevMode) && initNgDevMode();
let ngComponentDef = null;
// Metadata may have resources which need to be resolved.
maybeQueueResolutionOfComponentResources(type, metadata);
// Note that we're using the same function as `Directive`, because that's only subset of metadata
// that we need to create the ngFactoryDef. We're avoiding using the component metadata
// because we'd have to resolve the asynchronous templates.
addDirectiveFactoryDef(type, metadata);
Object.defineProperty(type, NG_COMP_DEF, {
get: () => {
if (ngComponentDef === null) {
const compiler = getCompilerFacade();
if (componentNeedsResolution(metadata)) {
const error = [`Component '${type.name}' is not resolved:`];
if (metadata.templateUrl) {
error.push(` - templateUrl: ${metadata.templateUrl}`);
}
if (metadata.styleUrls && metadata.styleUrls.length) {
error.push(` - styleUrls: ${JSON.stringify(metadata.styleUrls)}`);
}
error.push(`Did you run and wait for 'resolveComponentResources()'?`);
throw new Error(error.join('\n'));
}
// This const was called `jitOptions` previously but had to be renamed to `options` because
// of a bug with Terser that caused optimized JIT builds to throw a `ReferenceError`.
// This bug was investigated in https://github.com/angular/angular-cli/issues/17264.
// We should not rename it back until https://github.com/terser/terser/issues/615 is fixed.
const options = getJitOptions();
let preserveWhitespaces = metadata.preserveWhitespaces;
if (preserveWhitespaces === undefined) {
if (options !== null && options.preserveWhitespaces !== undefined) {
preserveWhitespaces = options.preserveWhitespaces;
}
else {
preserveWhitespaces = false;
}
}
let encapsulation = metadata.encapsulation;
if (encapsulation === undefined) {
if (options !== null && options.defaultEncapsulation !== undefined) {
encapsulation = options.defaultEncapsulation;
}
else {
encapsulation = ViewEncapsulation.Emulated;
}
}
const templateUrl = metadata.templateUrl || `ng:///${type.name}/template.html`;
const meta = Object.assign(Object.assign({}, directiveMetadata(type, metadata)), { typeSourceSpan: compiler.createParseSourceSpan('Component', type.name, templateUrl), template: metadata.template || '', preserveWhitespaces, styles: metadata.styles || EMPTY_ARRAY, animations: metadata.animations, directives: [], changeDetection: metadata.changeDetection, pipes: new Map(), encapsulation, interpolation: metadata.interpolation, viewProviders: metadata.viewProviders || null });
if (meta.usesInheritance) {
addDirectiveDefToUndecoratedParents(type);
}
ngComponentDef = compiler.compileComponent(angularCoreEnv, templateUrl, meta);
// When NgModule decorator executed, we enqueued the module definition such that
// it would only dequeue and add itself as module scope to all of its declarations,
// but only if if all of its declarations had resolved. This call runs the check
// to see if any modules that are in the queue can be dequeued and add scope to
// their declarations.
flushModuleScopingQueueAsMuchAsPossible();
// If component compilation is async, then the @NgModule annotation which declares the
// component may execute and set an ngSelectorScope property on the component type. This
// allows the component to patch itself with directiveDefs from the module after it
// finishes compiling.
if (hasSelectorScope(type)) {
const scopes = transitiveScopesFor(type.ngSelectorScope);
patchComponentDefWithScope(ngComponentDef, scopes);
}
}
return ngComponentDef;
},
// Make the property configurable in dev mode to allow overriding in tests
configurable: !!ngDevMode,
});
}
function hasSelectorScope(component) {
return component.ngSelectorScope !== undefined;
}
/**
* Compile an Angular directive according to its decorator metadata, and patch the resulting
* directive def onto the component type.
*
* In the event that compilation is not immediate, `compileDirective` will return a `Promise` which
* will resolve when compilation completes and the directive becomes usable.
*/
export function compileDirective(type, directive) {
let ngDirectiveDef = null;
addDirectiveFactoryDef(type, directive || {});
Object.defineProperty(type, NG_DIR_DEF, {
get: () => {
if (ngDirectiveDef === null) {
// `directive` can be null in the case of abstract directives as a base class
// that use `@Directive()` with no selector. In that case, pass empty object to the
// `directiveMetadata` function instead of null.
const meta = getDirectiveMetadata(type, directive || {});
ngDirectiveDef =
getCompilerFacade().compileDirective(angularCoreEnv, meta.sourceMapUrl, meta.metadata);
}
return ngDirectiveDef;
},
// Make the property configurable in dev mode to allow overriding in tests
configurable: !!ngDevMode,
});
}
function getDirectiveMetadata(type, metadata) {
const name = type && type.name;
const sourceMapUrl = `ng:///${name}/ɵdir.js`;
const compiler = getCompilerFacade();
const facade = directiveMetadata(type, metadata);
facade.typeSourceSpan = compiler.createParseSourceSpan('Directive', name, sourceMapUrl);
if (facade.usesInheritance) {
addDirectiveDefToUndecoratedParents(type);
}
return { metadata: facade, sourceMapUrl };
}
function addDirectiveFactoryDef(type, metadata) {
let ngFactoryDef = null;
Object.defineProperty(type, NG_FACTORY_DEF, {
get: () => {
if (ngFactoryDef === null) {
const meta = getDirectiveMetadata(type, metadata);
const compiler = getCompilerFacade();
ngFactoryDef = compiler.compileFactory(angularCoreEnv, `ng:///${type.name}/ɵfac.js`, Object.assign(Object.assign({}, meta.metadata), { injectFn: 'directiveInject', target: compiler.R3FactoryTarget.Directive }));
}
return ngFactoryDef;
},
// Make the property configurable in dev mode to allow overriding in tests
configurable: !!ngDevMode,
});
}
export function extendsDirectlyFromObject(type) {
return Object.getPrototypeOf(type.prototype) === Object.prototype;
}
/**
* Extract the `R3DirectiveMetadata` for a particular directive (either a `Directive` or a
* `Component`).
*/
export function directiveMetadata(type, metadata) {
// Reflect inputs and outputs.
const reflect = getReflect();
const propMetadata = reflect.ownPropMetadata(type);
return {
name: type.name,
type: type,
typeArgumentCount: 0,
selector: metadata.selector !== undefined ? metadata.selector : null,
deps: reflectDependencies(type),
host: metadata.host || EMPTY_OBJ,
propMetadata: propMetadata,
inputs: metadata.inputs || EMPTY_ARRAY,
outputs: metadata.outputs || EMPTY_ARRAY,
queries: extractQueriesMetadata(type, propMetadata, isContentQuery),
lifecycle: { usesOnChanges: reflect.hasLifecycleHook(type, 'ngOnChanges') },
typeSourceSpan: null,
usesInheritance: !extendsDirectlyFromObject(type),
exportAs: extractExportAs(metadata.exportAs),
providers: metadata.providers || null,
viewQueries: extractQueriesMetadata(type, propMetadata, isViewQuery)
};
}
/**
* Adds a directive definition to all parent classes of a type that don't have an Angular decorator.
*/
function addDirectiveDefToUndecoratedParents(type) {
const objPrototype = Object.prototype;
let parent = Object.getPrototypeOf(type.prototype).constructor;
// Go up the prototype until we hit `Object`.
while (parent && parent !== objPrototype) {
// Since inheritance works if the class was annotated already, we only need to add
// the def if there are no annotations and the def hasn't been created already.
if (!getDirectiveDef(parent) && !getComponentDef(parent) &&
shouldAddAbstractDirective(parent)) {
compileDirective(parent, null);
}
parent = Object.getPrototypeOf(parent);
}
}
function convertToR3QueryPredicate(selector) {
return typeof selector === 'string' ? splitByComma(selector) : resolveForwardRef(selector);
}
export function convertToR3QueryMetadata(propertyName, ann) {
return {
propertyName: propertyName,
predicate: convertToR3QueryPredicate(ann.selector),
descendants: ann.descendants,
first: ann.first,
read: ann.read ? ann.read : null,
static: !!ann.static
};
}
function extractQueriesMetadata(type, propMetadata, isQueryAnn) {
const queriesMeta = [];
for (const field in propMetadata) {
if (propMetadata.hasOwnProperty(field)) {
const annotations = propMetadata[field];
annotations.forEach(ann => {
if (isQueryAnn(ann)) {
if (!ann.selector) {
throw new Error(`Can't construct a query for the property "${field}" of ` +
`"${stringifyForError(type)}" since the query selector wasn't defined.`);
}
if (annotations.some(isInputAnnotation)) {
throw new Error(`Cannot combine @Input decorators with query decorators`);
}
queriesMeta.push(convertToR3QueryMetadata(field, ann));
}
});
}
}
return queriesMeta;
}
function extractExportAs(exportAs) {
return exportAs === undefined ? null : splitByComma(exportAs);
}
function isContentQuery(value) {
const name = value.ngMetadataName;
return name === 'ContentChild' || name === 'ContentChildren';
}
function isViewQuery(value) {
const name = value.ngMetadataName;
return name === 'ViewChild' || name === 'ViewChildren';
}
function isInputAnnotation(value) {
return value.ngMetadataName === 'Input';
}
function splitByComma(value) {
return value.split(',').map(piece => piece.trim());
}
const LIFECYCLE_HOOKS = [
'ngOnChanges', 'ngOnInit', 'ngOnDestroy', 'ngDoCheck', 'ngAfterViewInit', 'ngAfterViewChecked',
'ngAfterContentInit', 'ngAfterContentChecked'
];
function shouldAddAbstractDirective(type) {
const reflect = getReflect();
if (LIFECYCLE_HOOKS.some(hookName => reflect.hasLifecycleHook(type, hookName))) {
return true;
}
const propMetadata = reflect.propMetadata(type);
for (const field in propMetadata) {
const annotations = propMetadata[field];
for (let i = 0; i < annotations.length; i++) {
const current = annotations[i];
const metadataName = current.ngMetadataName;
if (isInputAnnotation(current) || isContentQuery(current) || isViewQuery(current) ||
metadataName === 'Output' || metadataName === 'HostBinding' ||
metadataName === 'HostListener') {
return true;
}
}
}
return false;
}
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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 {getCompilerFacade, R3DirectiveMetadataFacade} from '../../compiler/compiler_facade';\nimport {R3ComponentMetadataFacade, R3QueryMetadataFacade} from '../../compiler/compiler_facade_interface';\nimport {resolveForwardRef} from '../../di/forward_ref';\nimport {getReflect, reflectDependencies} from '../../di/jit/util';\nimport {Type} from '../../interface/type';\nimport {Query} from '../../metadata/di';\nimport {Component, Directive, Input} from '../../metadata/directives';\nimport {componentNeedsResolution, maybeQueueResolutionOfComponentResources} from '../../metadata/resource_loading';\nimport {ViewEncapsulation} from '../../metadata/view';\nimport {initNgDevMode} from '../../util/ng_dev_mode';\nimport {getComponentDef, getDirectiveDef} from '../definition';\nimport {EMPTY_ARRAY, EMPTY_OBJ} from '../empty';\nimport {NG_COMP_DEF, NG_DIR_DEF, NG_FACTORY_DEF} from '../fields';\nimport {ComponentType} from '../interfaces/definition';\nimport {stringifyForError} from '../util/misc_utils';\n\nimport {angularCoreEnv} from './environment';\nimport {getJitOptions} from './jit_options';\nimport {flushModuleScopingQueueAsMuchAsPossible, patchComponentDefWithScope, transitiveScopesFor} from './module';\n\n\n\n/**\n * Compile an Angular component according to its decorator metadata, and patch the resulting\n * component def (ɵcmp) onto the component type.\n *\n * Compilation may be asynchronous (due to the need to resolve URLs for the component template or\n * other resources, for example). In the event that compilation is not immediate, `compileComponent`\n * will enqueue resource resolution into a global queue and will fail to return the `ɵcmp`\n * until the global queue has been resolved with a call to `resolveComponentResources`.\n */\nexport function compileComponent(type: Type<any>, metadata: Component): void {\n  // Initialize ngDevMode. This must be the first statement in compileComponent.\n  // See the `initNgDevMode` docstring for more information.\n  (typeof ngDevMode === 'undefined' || ngDevMode) && initNgDevMode();\n\n  let ngComponentDef: any = null;\n\n  // Metadata may have resources which need to be resolved.\n  maybeQueueResolutionOfComponentResources(type, metadata);\n\n  // Note that we're using the same function as `Directive`, because that's only subset of metadata\n  // that we need to create the ngFactoryDef. We're avoiding using the component metadata\n  // because we'd have to resolve the asynchronous templates.\n  addDirectiveFactoryDef(type, metadata);\n\n  Object.defineProperty(type, NG_COMP_DEF, {\n    get: () => {\n      if (ngComponentDef === null) {\n        const compiler = getCompilerFacade();\n\n        if (componentNeedsResolution(metadata)) {\n          const error = [`Component '${type.name}' is not resolved:`];\n          if (metadata.templateUrl) {\n            error.push(` - templateUrl: ${metadata.templateUrl}`);\n          }\n          if (metadata.styleUrls && metadata.styleUrls.length) {\n            error.push(` - styleUrls: ${JSON.stringify(metadata.styleUrls)}`);\n          }\n          error.push(`Did you run and wait for 'resolveComponentResources()'?`);\n          throw new Error(error.join('\\n'));\n        }\n\n        // This const was called `jitOptions` previously but had to be renamed to `options` because\n        // of a bug with Terser that caused optimized JIT builds to throw a `ReferenceError`.\n        // This bug was investigated in https://github.com/angular/angular-cli/issues/17264.\n        // We should not rename it back until https://github.com/terser/terser/issues/615 is fixed.\n        const options = getJitOptions();\n        let preserveWhitespaces = metadata.preserveWhitespaces;\n        if (preserveWhitespaces === undefined) {\n          if (options !== null && options.preserveWhitespaces !== undefined) {\n            preserveWhitespaces = options.preserveWhitespaces;\n          } else {\n            preserveWhitespaces = false;\n          }\n        }\n        let encapsulation = metadata.encapsulation;\n        if (encapsulation === undefined) {\n          if (options !== null && options.defaultEncapsulation !== undefined) {\n            encapsulation = options.defaultEncapsulation;\n          } else {\n            encapsulation = ViewEncapsulation.Emulated;\n          }\n        }\n\n        const templateUrl = metadata.templateUrl || `ng:///${type.name}/template.html`;\n        const meta: R3ComponentMetadataFacade = {\n          ...directiveMetadata(type, metadata),\n          typeSourceSpan: compiler.createParseSourceSpan('Component', type.name, templateUrl),\n          template: metadata.template || '',\n          preserveWhitespaces,\n          styles: metadata.styles || EMPTY_ARRAY,\n          animations: metadata.animations,\n          directives: [],\n          changeDetection: metadata.changeDetection,\n          pipes: new Map(),\n          encapsulation,\n          interpolation: metadata.interpolation,\n          viewProviders: metadata.viewProviders || null,\n        };\n        if (meta.usesInheritance) {\n          addDirectiveDefToUndecoratedParents(type);\n        }\n\n        ngComponentDef = compiler.compileComponent(angularCoreEnv, templateUrl, meta);\n\n        // When NgModule decorator executed, we enqueued the module definition such that\n        // it would only dequeue and add itself as module scope to all of its declarations,\n        // but only if  if all of its declarations had resolved. This call runs the check\n        // to see if any modules that are in the queue can be dequeued and add scope to\n        // their declarations.\n        flushModuleScopingQueueAsMuchAsPossible();\n\n        // If component compilation is async, then the @NgModule annotation which declares the\n        // component may execute and set an ngSelectorScope property on the component type. This\n        // allows the component to patch itself with directiveDefs from the module after it\n        // finishes compiling.\n        if (hasSelectorScope(type)) {\n          const scopes = transitiveScopesFor(type.ngSelectorScope);\n          patchComponentDefWithScope(ngComponentDef, scopes);\n        }\n      }\n      return ngComponentDef;\n    },\n    // Make the property configurable in dev mode to allow overriding in tests\n    configurable: !!ngDevMode,\n  });\n}\n\nfunction hasSelectorScope<T>(component: Type<T>): component is Type<T>&\n    {ngSelectorScope: Type<any>} {\n  return (component as {ngSelectorScope?: any}).ngSelectorScope !== undefined;\n}\n\n/**\n * Compile an Angular directive according to its decorator metadata, and patch the resulting\n * directive def onto the component type.\n *\n * In the event that compilation is not immediate, `compileDirective` will return a `Promise` which\n * will resolve when compilation completes and the directive becomes usable.\n */\nexport function compileDirective(type: Type<any>, directive: Directive|null): void {\n  let ngDirectiveDef: any = null;\n\n  addDirectiveFactoryDef(type, directive || {});\n\n  Object.defineProperty(type, NG_DIR_DEF, {\n    get: () => {\n      if (ngDirectiveDef === null) {\n        // `directive` can be null in the case of abstract directives as a base class\n        // that use `@Directive()` with no selector. In that case, pass empty object to the\n        // `directiveMetadata` function instead of null.\n        const meta = getDirectiveMetadata(type, directive || {});\n        ngDirectiveDef =\n            getCompilerFacade().compileDirective(angularCoreEnv, meta.sourceMapUrl, meta.metadata);\n      }\n      return ngDirectiveDef;\n    },\n    // Make the property configurable in dev mode to allow overriding in tests\n    configurable: !!ngDevMode,\n  });\n}\n\nfunction getDirectiveMetadata(type: Type<any>, metadata: Directive) {\n  const name = type && type.name;\n  const sourceMapUrl = `ng:///${name}/ɵdir.js`;\n  const compiler = getCompilerFacade();\n  const facade = directiveMetadata(type as ComponentType<any>, metadata);\n  facade.typeSourceSpan = compiler.createParseSourceSpan('Directive', name, sourceMapUrl);\n  if (facade.usesInheritance) {\n    addDirectiveDefToUndecoratedParents(type);\n  }\n  return {metadata: facade, sourceMapUrl};\n}\n\nfunction addDirectiveFactoryDef(type: Type<any>, metadata: Directive|Component) {\n  let ngFactoryDef: any = null;\n\n  Object.defineProperty(type, NG_FACTORY_DEF, {\n    get: () => {\n      if (ngFactoryDef === null) {\n        const meta = getDirectiveMetadata(type, metadata);\n        const compiler = getCompilerFacade();\n        ngFactoryDef = compiler.compileFactory(angularCoreEnv, `ng:///${type.name}/ɵfac.js`, {\n          ...meta.metadata,\n          injectFn: 'directiveInject',\n          target: compiler.R3FactoryTarget.Directive\n        });\n      }\n      return ngFactoryDef;\n    },\n    // Make the property configurable in dev mode to allow overriding in tests\n    configurable: !!ngDevMode,\n  });\n}\n\nexport function extendsDirectlyFromObject(type: Type<any>): boolean {\n  return Object.getPrototypeOf(type.prototype) === Object.prototype;\n}\n\n/**\n * Extract the `R3DirectiveMetadata` for a particular directive (either a `Directive` or a\n * `Component`).\n */\nexport function directiveMetadata(type: Type<any>, metadata: Directive): R3DirectiveMetadataFacade {\n  // Reflect inputs and outputs.\n  const reflect = getReflect();\n  const propMetadata = reflect.ownPropMetadata(type);\n\n  return {\n    name: type.name,\n    type: type,\n    typeArgumentCount: 0,\n    selector: metadata.selector !== undefined ? metadata.selector : null,\n    deps: reflectDependencies(type),\n    host: metadata.host || EMPTY_OBJ,\n    propMetadata: propMetadata,\n    inputs: metadata.inputs || EMPTY_ARRAY,\n    outputs: metadata.outputs || EMPTY_ARRAY,\n    queries: extractQueriesMetadata(type, propMetadata, isContentQuery),\n    lifecycle: {usesOnChanges: reflect.hasLifecycleHook(type, 'ngOnChanges')},\n    typeSourceSpan: null!,\n    usesInheritance: !extendsDirectlyFromObject(type),\n    exportAs: extractExportAs(metadata.exportAs),\n    providers: metadata.providers || null,\n    viewQueries: extractQueriesMetadata(type, propMetadata, isViewQuery)\n  };\n}\n\n/**\n * Adds a directive definition to all parent classes of a type that don't have an Angular decorator.\n */\nfunction addDirectiveDefToUndecoratedParents(type: Type<any>) {\n  const objPrototype = Object.prototype;\n  let parent = Object.getPrototypeOf(type.prototype).constructor;\n\n  // Go up the prototype until we hit `Object`.\n  while (parent && parent !== objPrototype) {\n    // Since inheritance works if the class was annotated already, we only need to add\n    // the def if there are no annotations and the def hasn't been created already.\n    if (!getDirectiveDef(parent) && !getComponentDef(parent) &&\n        shouldAddAbstractDirective(parent)) {\n      compileDirective(parent, null);\n    }\n    parent = Object.getPrototypeOf(parent);\n  }\n}\n\nfunction convertToR3QueryPredicate(selector: any): any|string[] {\n  return typeof selector === 'string' ? splitByComma(selector) : resolveForwardRef(selector);\n}\n\nexport function convertToR3QueryMetadata(propertyName: string, ann: Query): R3QueryMetadataFacade {\n  return {\n    propertyName: propertyName,\n    predicate: convertToR3QueryPredicate(ann.selector),\n    descendants: ann.descendants,\n    first: ann.first,\n    read: ann.read ? ann.read : null,\n    static: !!ann.static\n  };\n}\nfunction extractQueriesMetadata(\n    type: Type<any>, propMetadata: {[key: string]: any[]},\n    isQueryAnn: (ann: any) => ann is Query): R3QueryMetadataFacade[] {\n  const queriesMeta: R3QueryMetadataFacade[] = [];\n  for (const field in propMetadata) {\n    if (propMetadata.hasOwnProperty(field)) {\n      const annotations = propMetadata[field];\n      annotations.forEach(ann => {\n        if (isQueryAnn(ann)) {\n          if (!ann.selector) {\n            throw new Error(\n                `Can't construct a query for the property \"${field}\" of ` +\n                `\"${stringifyForError(type)}\" since the query selector wasn't defined.`);\n          }\n          if (annotations.some(isInputAnnotation)) {\n            throw new Error(`Cannot combine @Input decorators with query decorators`);\n          }\n          queriesMeta.push(convertToR3QueryMetadata(field, ann));\n        }\n      });\n    }\n  }\n  return queriesMeta;\n}\n\nfunction extractExportAs(exportAs: string|undefined): string[]|null {\n  return exportAs === undefined ? null : splitByComma(exportAs);\n}\n\nfunction isContentQuery(value: any): value is Query {\n  const name = value.ngMetadataName;\n  return name === 'ContentChild' || name === 'ContentChildren';\n}\n\nfunction isViewQuery(value: any): value is Query {\n  const name = value.ngMetadataName;\n  return name === 'ViewChild' || name === 'ViewChildren';\n}\n\nfunction isInputAnnotation(value: any): value is Input {\n  return value.ngMetadataName === 'Input';\n}\n\nfunction splitByComma(value: string): string[] {\n  return value.split(',').map(piece => piece.trim());\n}\n\nconst LIFECYCLE_HOOKS = [\n  'ngOnChanges', 'ngOnInit', 'ngOnDestroy', 'ngDoCheck', 'ngAfterViewInit', 'ngAfterViewChecked',\n  'ngAfterContentInit', 'ngAfterContentChecked'\n];\n\nfunction shouldAddAbstractDirective(type: Type<any>): boolean {\n  const reflect = getReflect();\n\n  if (LIFECYCLE_HOOKS.some(hookName => reflect.hasLifecycleHook(type, hookName))) {\n    return true;\n  }\n\n  const propMetadata = reflect.propMetadata(type);\n\n  for (const field in propMetadata) {\n    const annotations = propMetadata[field];\n\n    for (let i = 0; i < annotations.length; i++) {\n      const current = annotations[i];\n      const metadataName = current.ngMetadataName;\n\n      if (isInputAnnotation(current) || isContentQuery(current) || isViewQuery(current) ||\n          metadataName === 'Output' || metadataName === 'HostBinding' ||\n          metadataName === 'HostListener') {\n        return true;\n      }\n    }\n  }\n\n  return false;\n}\n"]}