@angular/core
Version:
Angular - the core framework
300 lines • 47.3 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
*/
(function (factory) {
if (typeof module === "object" && typeof module.exports === "object") {
var v = factory(require, exports);
if (v !== undefined) module.exports = v;
}
else if (typeof define === "function" && define.amd) {
define("@angular/core/schematics/migrations/undecorated-classes-with-decorated-fields/transform", ["require", "exports", "@angular/compiler-cli/src/ngtsc/partial_evaluator", "@angular/compiler-cli/src/ngtsc/reflection", "typescript", "@angular/core/schematics/utils/import_manager", "@angular/core/schematics/utils/ng_decorators", "@angular/core/schematics/utils/typescript/find_base_classes", "@angular/core/schematics/utils/typescript/functions", "@angular/core/schematics/utils/typescript/property_name"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.UndecoratedClassesWithDecoratedFieldsTransform = void 0;
const partial_evaluator_1 = require("@angular/compiler-cli/src/ngtsc/partial_evaluator");
const reflection_1 = require("@angular/compiler-cli/src/ngtsc/reflection");
const ts = require("typescript");
const import_manager_1 = require("@angular/core/schematics/utils/import_manager");
const ng_decorators_1 = require("@angular/core/schematics/utils/ng_decorators");
const find_base_classes_1 = require("@angular/core/schematics/utils/typescript/find_base_classes");
const functions_1 = require("@angular/core/schematics/utils/typescript/functions");
const property_name_1 = require("@angular/core/schematics/utils/typescript/property_name");
/**
* Set of known decorators that indicate that the current class needs a directive
* definition. These decorators are always specific to directives.
*/
const DIRECTIVE_FIELD_DECORATORS = new Set([
'Input', 'Output', 'ViewChild', 'ViewChildren', 'ContentChild', 'ContentChildren', 'HostBinding',
'HostListener'
]);
/**
* Set of known lifecycle hooks that indicate that the current class needs a directive
* definition. These lifecycle hooks are always specific to directives.
*/
const DIRECTIVE_LIFECYCLE_HOOKS = new Set([
'ngOnChanges', 'ngOnInit', 'ngDoCheck', 'ngAfterViewInit', 'ngAfterViewChecked',
'ngAfterContentInit', 'ngAfterContentChecked'
]);
/**
* Set of known lifecycle hooks that indicate that a given class uses Angular
* features, but it's ambiguous whether it is a directive or service.
*/
const AMBIGUOUS_LIFECYCLE_HOOKS = new Set(['ngOnDestroy']);
/** Describes how a given class is used in the context of Angular. */
var InferredKind;
(function (InferredKind) {
InferredKind[InferredKind["DIRECTIVE"] = 0] = "DIRECTIVE";
InferredKind[InferredKind["AMBIGUOUS"] = 1] = "AMBIGUOUS";
InferredKind[InferredKind["UNKNOWN"] = 2] = "UNKNOWN";
})(InferredKind || (InferredKind = {}));
/** Describes possible types of Angular declarations. */
var DeclarationType;
(function (DeclarationType) {
DeclarationType[DeclarationType["DIRECTIVE"] = 0] = "DIRECTIVE";
DeclarationType[DeclarationType["COMPONENT"] = 1] = "COMPONENT";
DeclarationType[DeclarationType["ABSTRACT_DIRECTIVE"] = 2] = "ABSTRACT_DIRECTIVE";
DeclarationType[DeclarationType["PIPE"] = 3] = "PIPE";
DeclarationType[DeclarationType["INJECTABLE"] = 4] = "INJECTABLE";
})(DeclarationType || (DeclarationType = {}));
/** TODO message that is added to ambiguous classes using Angular features. */
const AMBIGUOUS_CLASS_TODO = 'Add Angular decorator.';
class UndecoratedClassesWithDecoratedFieldsTransform {
constructor(typeChecker, getUpdateRecorder) {
this.typeChecker = typeChecker;
this.getUpdateRecorder = getUpdateRecorder;
this.printer = ts.createPrinter();
this.importManager = new import_manager_1.ImportManager(this.getUpdateRecorder, this.printer);
this.reflectionHost = new reflection_1.TypeScriptReflectionHost(this.typeChecker);
this.partialEvaluator = new partial_evaluator_1.PartialEvaluator(this.reflectionHost, this.typeChecker, null);
}
/**
* Migrates the specified source files. The transform adds the abstract `@Directive`
* decorator to undecorated classes that use Angular features. Class members which
* are decorated with any Angular decorator, or class members for lifecycle hooks are
* indicating that a given class uses Angular features. https://hackmd.io/vuQfavzfRG6KUCtU7oK_EA
*/
migrate(sourceFiles) {
const { detectedAbstractDirectives, ambiguousClasses } = this._findUndecoratedAbstractDirectives(sourceFiles);
detectedAbstractDirectives.forEach(node => {
const sourceFile = node.getSourceFile();
const recorder = this.getUpdateRecorder(sourceFile);
const directiveExpr = this.importManager.addImportToSourceFile(sourceFile, 'Directive', '@angular/core');
const decoratorExpr = ts.createDecorator(ts.createCall(directiveExpr, undefined, undefined));
recorder.addClassDecorator(node, this.printer.printNode(ts.EmitHint.Unspecified, decoratorExpr, sourceFile));
});
// Ambiguous classes clearly use Angular features, but the migration is unable to
// determine whether the class is used as directive, service or pipe. The migration
// could potentially determine the type by checking NgModule definitions or inheritance
// of other known declarations, but this is out of scope and a TODO/failure is sufficient.
return Array.from(ambiguousClasses).reduce((failures, node) => {
// If the class has been reported as ambiguous before, skip adding a TODO and
// printing an error. A class could be visited multiple times when it's part
// of multiple build targets in the CLI project.
if (this._hasBeenReportedAsAmbiguous(node)) {
return failures;
}
const sourceFile = node.getSourceFile();
const recorder = this.getUpdateRecorder(sourceFile);
// Add a TODO to the class that uses Angular features but is not decorated.
recorder.addClassTodo(node, AMBIGUOUS_CLASS_TODO);
// Add an error for the class that will be printed in the `ng update` output.
return failures.concat({
node,
message: 'Class uses Angular features but cannot be migrated automatically. Please ' +
'add an appropriate Angular decorator.'
});
}, []);
}
/** Records all changes that were made in the import manager. */
recordChanges() {
this.importManager.recordChanges();
}
/**
* Finds undecorated abstract directives in the specified source files. Also returns
* a set of undecorated classes which could not be detected as guaranteed abstract
* directives. Those are ambiguous and could be either Directive, Pipe or service.
*/
_findUndecoratedAbstractDirectives(sourceFiles) {
const ambiguousClasses = new Set();
const declarations = new WeakMap();
const detectedAbstractDirectives = new Set();
const undecoratedClasses = new Set();
const visitNode = (node) => {
node.forEachChild(visitNode);
if (!ts.isClassDeclaration(node)) {
return;
}
const { inferredKind, decoratedType } = this._analyzeClassDeclaration(node);
if (decoratedType !== null) {
declarations.set(node, decoratedType);
return;
}
if (inferredKind === InferredKind.DIRECTIVE) {
detectedAbstractDirectives.add(node);
}
else if (inferredKind === InferredKind.AMBIGUOUS) {
ambiguousClasses.add(node);
}
else {
undecoratedClasses.add(node);
}
};
sourceFiles.forEach(sourceFile => sourceFile.forEachChild(visitNode));
/**
* Checks the inheritance of the given set of classes. It removes classes from the
* detected abstract directives set when they inherit from a non-abstract Angular
* declaration. e.g. an abstract directive can never extend from a component.
*
* If a class inherits from an abstract directive though, we will migrate them too
* as derived classes also need to be decorated. This has been done for a simpler mental
* model and reduced complexity in the Angular compiler. See migration plan document.
*/
const checkInheritanceOfClasses = (classes) => {
classes.forEach(node => {
for (const { node: baseClass } of find_base_classes_1.findBaseClassDeclarations(node, this.typeChecker)) {
if (!declarations.has(baseClass)) {
continue;
}
// If the undecorated class inherits from an abstract directive, always migrate it.
// Derived undecorated classes of abstract directives are always also considered
// abstract directives and need to be decorated too. This is necessary as otherwise
// the inheritance chain cannot be resolved by the Angular compiler. e.g. when it
// flattens directive metadata for type checking. In the other case, we never want
// to migrate a class if it extends from a non-abstract Angular declaration. That
// is an unsupported pattern as of v9 and was previously handled with the
// `undecorated-classes-with-di` migration (which copied the inherited decorator).
if (declarations.get(baseClass) === DeclarationType.ABSTRACT_DIRECTIVE) {
detectedAbstractDirectives.add(node);
}
else {
detectedAbstractDirectives.delete(node);
}
ambiguousClasses.delete(node);
break;
}
});
};
// Check inheritance of any detected abstract directive. We want to remove
// classes that are not eligible abstract directives due to inheritance. i.e.
// if a class extends from a component, it cannot be a derived abstract directive.
checkInheritanceOfClasses(detectedAbstractDirectives);
// Update the class declarations to reflect the detected abstract directives. This is
// then used later when we check for undecorated classes that inherit from an abstract
// directive and need to be decorated.
detectedAbstractDirectives.forEach(n => declarations.set(n, DeclarationType.ABSTRACT_DIRECTIVE));
// Check ambiguous and undecorated classes if they inherit from an abstract directive.
// If they do, we want to migrate them too. See function definition for more details.
checkInheritanceOfClasses(ambiguousClasses);
checkInheritanceOfClasses(undecoratedClasses);
return { detectedAbstractDirectives, ambiguousClasses };
}
/**
* Analyzes the given class declaration by determining whether the class
* is a directive, is an abstract directive, or uses Angular features.
*/
_analyzeClassDeclaration(node) {
const ngDecorators = node.decorators && ng_decorators_1.getAngularDecorators(this.typeChecker, node.decorators);
const inferredKind = this._determineClassKind(node);
if (ngDecorators === undefined || ngDecorators.length === 0) {
return { decoratedType: null, inferredKind };
}
const directiveDecorator = ngDecorators.find(({ name }) => name === 'Directive');
const componentDecorator = ngDecorators.find(({ name }) => name === 'Component');
const pipeDecorator = ngDecorators.find(({ name }) => name === 'Pipe');
const injectableDecorator = ngDecorators.find(({ name }) => name === 'Injectable');
const isAbstractDirective = directiveDecorator !== undefined && this._isAbstractDirective(directiveDecorator);
let decoratedType = null;
if (isAbstractDirective) {
decoratedType = DeclarationType.ABSTRACT_DIRECTIVE;
}
else if (componentDecorator !== undefined) {
decoratedType = DeclarationType.COMPONENT;
}
else if (directiveDecorator !== undefined) {
decoratedType = DeclarationType.DIRECTIVE;
}
else if (pipeDecorator !== undefined) {
decoratedType = DeclarationType.PIPE;
}
else if (injectableDecorator !== undefined) {
decoratedType = DeclarationType.INJECTABLE;
}
return { decoratedType, inferredKind };
}
/**
* Checks whether the given decorator resolves to an abstract directive. An directive is
* considered "abstract" if there is no selector specified.
*/
_isAbstractDirective({ node }) {
const metadataArgs = node.expression.arguments;
if (metadataArgs.length === 0) {
return true;
}
const metadataExpr = functions_1.unwrapExpression(metadataArgs[0]);
if (!ts.isObjectLiteralExpression(metadataExpr)) {
return false;
}
const metadata = reflection_1.reflectObjectLiteral(metadataExpr);
if (!metadata.has('selector')) {
return false;
}
const selector = this.partialEvaluator.evaluate(metadata.get('selector'));
return selector == null;
}
/**
* Determines the kind of a given class in terms of Angular. The method checks
* whether the given class has members that indicate the use of Angular features.
* e.g. lifecycle hooks or decorated members like `@Input` or `@Output` are
* considered Angular features..
*/
_determineClassKind(node) {
let usage = InferredKind.UNKNOWN;
for (const member of node.members) {
const propertyName = member.name !== undefined ? property_name_1.getPropertyNameText(member.name) : null;
// If the class declares any of the known directive lifecycle hooks, we can
// immediately exit the loop as the class is guaranteed to be a directive.
if (propertyName !== null && DIRECTIVE_LIFECYCLE_HOOKS.has(propertyName)) {
return InferredKind.DIRECTIVE;
}
const ngDecorators = member.decorators !== undefined ?
ng_decorators_1.getAngularDecorators(this.typeChecker, member.decorators) :
[];
for (const { name } of ngDecorators) {
if (DIRECTIVE_FIELD_DECORATORS.has(name)) {
return InferredKind.DIRECTIVE;
}
}
// If the class declares any of the lifecycle hooks that do not guarantee that
// the given class is a directive, update the kind and continue looking for other
// members that would unveil a more specific kind (i.e. being a directive).
if (propertyName !== null && AMBIGUOUS_LIFECYCLE_HOOKS.has(propertyName)) {
usage = InferredKind.AMBIGUOUS;
}
}
return usage;
}
/**
* Checks whether a given class has been reported as ambiguous in previous
* migration run. e.g. when build targets are migrated first, and then test
* targets that have an overlap with build source files, the same class
* could be detected as ambiguous.
*/
_hasBeenReportedAsAmbiguous(node) {
const sourceFile = node.getSourceFile();
const leadingComments = ts.getLeadingCommentRanges(sourceFile.text, node.pos);
if (leadingComments === undefined) {
return false;
}
return leadingComments.some(({ kind, pos, end }) => kind === ts.SyntaxKind.SingleLineCommentTrivia &&
sourceFile.text.substring(pos, end).includes(`TODO: ${AMBIGUOUS_CLASS_TODO}`));
}
}
exports.UndecoratedClassesWithDecoratedFieldsTransform = UndecoratedClassesWithDecoratedFieldsTransform;
});
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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 {PartialEvaluator} from '@angular/compiler-cli/src/ngtsc/partial_evaluator';\nimport {reflectObjectLiteral, TypeScriptReflectionHost} from '@angular/compiler-cli/src/ngtsc/reflection';\nimport * as ts from 'typescript';\n\nimport {ImportManager} from '../../utils/import_manager';\nimport {getAngularDecorators, NgDecorator} from '../../utils/ng_decorators';\nimport {findBaseClassDeclarations} from '../../utils/typescript/find_base_classes';\nimport {unwrapExpression} from '../../utils/typescript/functions';\nimport {getPropertyNameText} from '../../utils/typescript/property_name';\n\nimport {UpdateRecorder} from './update_recorder';\n\n/**\n * Set of known decorators that indicate that the current class needs a directive\n * definition. These decorators are always specific to directives.\n */\nconst DIRECTIVE_FIELD_DECORATORS = new Set([\n  'Input', 'Output', 'ViewChild', 'ViewChildren', 'ContentChild', 'ContentChildren', 'HostBinding',\n  'HostListener'\n]);\n\n/**\n * Set of known lifecycle hooks that indicate that the current class needs a directive\n * definition. These lifecycle hooks are always specific to directives.\n */\nconst DIRECTIVE_LIFECYCLE_HOOKS = new Set([\n  'ngOnChanges', 'ngOnInit', 'ngDoCheck', 'ngAfterViewInit', 'ngAfterViewChecked',\n  'ngAfterContentInit', 'ngAfterContentChecked'\n]);\n\n/**\n * Set of known lifecycle hooks that indicate that a given class uses Angular\n * features, but it's ambiguous whether it is a directive or service.\n */\nconst AMBIGUOUS_LIFECYCLE_HOOKS = new Set(['ngOnDestroy']);\n\n/** Describes how a given class is used in the context of Angular. */\nenum InferredKind {\n  DIRECTIVE,\n  AMBIGUOUS,\n  UNKNOWN,\n}\n\n/** Describes possible types of Angular declarations. */\nenum DeclarationType {\n  DIRECTIVE,\n  COMPONENT,\n  ABSTRACT_DIRECTIVE,\n  PIPE,\n  INJECTABLE,\n}\n\n/** Analyzed class declaration. */\ninterface AnalyzedClass {\n  /** Type of declaration that is determined through an applied decorator. */\n  decoratedType: DeclarationType|null;\n  /** Inferred class kind in terms of Angular. */\n  inferredKind: InferredKind;\n}\n\ninterface AnalysisFailure {\n  node: ts.Node;\n  message: string;\n}\n\n/** TODO message that is added to ambiguous classes using Angular features. */\nconst AMBIGUOUS_CLASS_TODO = 'Add Angular decorator.';\n\nexport class UndecoratedClassesWithDecoratedFieldsTransform {\n  private printer = ts.createPrinter();\n  private importManager = new ImportManager(this.getUpdateRecorder, this.printer);\n  private reflectionHost = new TypeScriptReflectionHost(this.typeChecker);\n  private partialEvaluator = new PartialEvaluator(this.reflectionHost, this.typeChecker, null);\n\n  constructor(\n      private typeChecker: ts.TypeChecker,\n      private getUpdateRecorder: (sf: ts.SourceFile) => UpdateRecorder) {}\n\n  /**\n   * Migrates the specified source files. The transform adds the abstract `@Directive`\n   * decorator to undecorated classes that use Angular features. Class members which\n   * are decorated with any Angular decorator, or class members for lifecycle hooks are\n   * indicating that a given class uses Angular features. https://hackmd.io/vuQfavzfRG6KUCtU7oK_EA\n   */\n  migrate(sourceFiles: ts.SourceFile[]): AnalysisFailure[] {\n    const {detectedAbstractDirectives, ambiguousClasses} =\n        this._findUndecoratedAbstractDirectives(sourceFiles);\n\n    detectedAbstractDirectives.forEach(node => {\n      const sourceFile = node.getSourceFile();\n      const recorder = this.getUpdateRecorder(sourceFile);\n      const directiveExpr =\n          this.importManager.addImportToSourceFile(sourceFile, 'Directive', '@angular/core');\n      const decoratorExpr = ts.createDecorator(ts.createCall(directiveExpr, undefined, undefined));\n      recorder.addClassDecorator(\n          node, this.printer.printNode(ts.EmitHint.Unspecified, decoratorExpr, sourceFile));\n    });\n\n    // Ambiguous classes clearly use Angular features, but the migration is unable to\n    // determine whether the class is used as directive, service or pipe. The migration\n    // could potentially determine the type by checking NgModule definitions or inheritance\n    // of other known declarations, but this is out of scope and a TODO/failure is sufficient.\n    return Array.from(ambiguousClasses).reduce((failures, node) => {\n      // If the class has been reported as ambiguous before, skip adding a TODO and\n      // printing an error. A class could be visited multiple times when it's part\n      // of multiple build targets in the CLI project.\n      if (this._hasBeenReportedAsAmbiguous(node)) {\n        return failures;\n      }\n\n      const sourceFile = node.getSourceFile();\n      const recorder = this.getUpdateRecorder(sourceFile);\n\n      // Add a TODO to the class that uses Angular features but is not decorated.\n      recorder.addClassTodo(node, AMBIGUOUS_CLASS_TODO);\n\n      // Add an error for the class that will be printed in the `ng update` output.\n      return failures.concat({\n        node,\n        message: 'Class uses Angular features but cannot be migrated automatically. Please ' +\n            'add an appropriate Angular decorator.'\n      });\n    }, [] as AnalysisFailure[]);\n  }\n\n  /** Records all changes that were made in the import manager. */\n  recordChanges() {\n    this.importManager.recordChanges();\n  }\n\n  /**\n   * Finds undecorated abstract directives in the specified source files. Also returns\n   * a set of undecorated classes which could not be detected as guaranteed abstract\n   * directives. Those are ambiguous and could be either Directive, Pipe or service.\n   */\n  private _findUndecoratedAbstractDirectives(sourceFiles: ts.SourceFile[]) {\n    const ambiguousClasses = new Set<ts.ClassDeclaration>();\n    const declarations = new WeakMap<ts.ClassDeclaration, DeclarationType>();\n    const detectedAbstractDirectives = new Set<ts.ClassDeclaration>();\n    const undecoratedClasses = new Set<ts.ClassDeclaration>();\n\n    const visitNode = (node: ts.Node) => {\n      node.forEachChild(visitNode);\n      if (!ts.isClassDeclaration(node)) {\n        return;\n      }\n      const {inferredKind, decoratedType} = this._analyzeClassDeclaration(node);\n\n      if (decoratedType !== null) {\n        declarations.set(node, decoratedType);\n        return;\n      }\n\n      if (inferredKind === InferredKind.DIRECTIVE) {\n        detectedAbstractDirectives.add(node);\n      } else if (inferredKind === InferredKind.AMBIGUOUS) {\n        ambiguousClasses.add(node);\n      } else {\n        undecoratedClasses.add(node);\n      }\n    };\n\n    sourceFiles.forEach(sourceFile => sourceFile.forEachChild(visitNode));\n\n    /**\n     * Checks the inheritance of the given set of classes. It removes classes from the\n     * detected abstract directives set when they inherit from a non-abstract Angular\n     * declaration. e.g. an abstract directive can never extend from a component.\n     *\n     * If a class inherits from an abstract directive though, we will migrate them too\n     * as derived classes also need to be decorated. This has been done for a simpler mental\n     * model and reduced complexity in the Angular compiler. See migration plan document.\n     */\n    const checkInheritanceOfClasses = (classes: Set<ts.ClassDeclaration>) => {\n      classes.forEach(node => {\n        for (const {node: baseClass} of findBaseClassDeclarations(node, this.typeChecker)) {\n          if (!declarations.has(baseClass)) {\n            continue;\n          }\n          // If the undecorated class inherits from an abstract directive, always migrate it.\n          // Derived undecorated classes of abstract directives are always also considered\n          // abstract directives and need to be decorated too. This is necessary as otherwise\n          // the inheritance chain cannot be resolved by the Angular compiler. e.g. when it\n          // flattens directive metadata for type checking. In the other case, we never want\n          // to migrate a class if it extends from a non-abstract Angular declaration. That\n          // is an unsupported pattern as of v9 and was previously handled with the\n          // `undecorated-classes-with-di` migration (which copied the inherited decorator).\n          if (declarations.get(baseClass) === DeclarationType.ABSTRACT_DIRECTIVE) {\n            detectedAbstractDirectives.add(node);\n          } else {\n            detectedAbstractDirectives.delete(node);\n          }\n          ambiguousClasses.delete(node);\n          break;\n        }\n      });\n    };\n\n    // Check inheritance of any detected abstract directive. We want to remove\n    // classes that are not eligible abstract directives due to inheritance. i.e.\n    // if a class extends from a component, it cannot be a derived abstract directive.\n    checkInheritanceOfClasses(detectedAbstractDirectives);\n    // Update the class declarations to reflect the detected abstract directives. This is\n    // then used later when we check for undecorated classes that inherit from an abstract\n    // directive and need to be decorated.\n    detectedAbstractDirectives.forEach(\n        n => declarations.set(n, DeclarationType.ABSTRACT_DIRECTIVE));\n    // Check ambiguous and undecorated classes if they inherit from an abstract directive.\n    // If they do, we want to migrate them too. See function definition for more details.\n    checkInheritanceOfClasses(ambiguousClasses);\n    checkInheritanceOfClasses(undecoratedClasses);\n\n    return {detectedAbstractDirectives, ambiguousClasses};\n  }\n\n  /**\n   * Analyzes the given class declaration by determining whether the class\n   * is a directive, is an abstract directive, or uses Angular features.\n   */\n  private _analyzeClassDeclaration(node: ts.ClassDeclaration): AnalyzedClass {\n    const ngDecorators = node.decorators && getAngularDecorators(this.typeChecker, node.decorators);\n    const inferredKind = this._determineClassKind(node);\n    if (ngDecorators === undefined || ngDecorators.length === 0) {\n      return {decoratedType: null, inferredKind};\n    }\n    const directiveDecorator = ngDecorators.find(({name}) => name === 'Directive');\n    const componentDecorator = ngDecorators.find(({name}) => name === 'Component');\n    const pipeDecorator = ngDecorators.find(({name}) => name === 'Pipe');\n    const injectableDecorator = ngDecorators.find(({name}) => name === 'Injectable');\n    const isAbstractDirective =\n        directiveDecorator !== undefined && this._isAbstractDirective(directiveDecorator);\n\n    let decoratedType: DeclarationType|null = null;\n    if (isAbstractDirective) {\n      decoratedType = DeclarationType.ABSTRACT_DIRECTIVE;\n    } else if (componentDecorator !== undefined) {\n      decoratedType = DeclarationType.COMPONENT;\n    } else if (directiveDecorator !== undefined) {\n      decoratedType = DeclarationType.DIRECTIVE;\n    } else if (pipeDecorator !== undefined) {\n      decoratedType = DeclarationType.PIPE;\n    } else if (injectableDecorator !== undefined) {\n      decoratedType = DeclarationType.INJECTABLE;\n    }\n    return {decoratedType, inferredKind};\n  }\n\n  /**\n   * Checks whether the given decorator resolves to an abstract directive. An directive is\n   * considered \"abstract\" if there is no selector specified.\n   */\n  private _isAbstractDirective({node}: NgDecorator): boolean {\n    const metadataArgs = node.expression.arguments;\n    if (metadataArgs.length === 0) {\n      return true;\n    }\n    const metadataExpr = unwrapExpression(metadataArgs[0]);\n    if (!ts.isObjectLiteralExpression(metadataExpr)) {\n      return false;\n    }\n    const metadata = reflectObjectLiteral(metadataExpr);\n    if (!metadata.has('selector')) {\n      return false;\n    }\n    const selector = this.partialEvaluator.evaluate(metadata.get('selector')!);\n    return selector == null;\n  }\n\n  /**\n   * Determines the kind of a given class in terms of Angular. The method checks\n   * whether the given class has members that indicate the use of Angular features.\n   * e.g. lifecycle hooks or decorated members like `@Input` or `@Output` are\n   * considered Angular features..\n   */\n  private _determineClassKind(node: ts.ClassDeclaration): InferredKind {\n    let usage = InferredKind.UNKNOWN;\n\n    for (const member of node.members) {\n      const propertyName = member.name !== undefined ? getPropertyNameText(member.name) : null;\n\n      // If the class declares any of the known directive lifecycle hooks, we can\n      // immediately exit the loop as the class is guaranteed to be a directive.\n      if (propertyName !== null && DIRECTIVE_LIFECYCLE_HOOKS.has(propertyName)) {\n        return InferredKind.DIRECTIVE;\n      }\n\n      const ngDecorators = member.decorators !== undefined ?\n          getAngularDecorators(this.typeChecker, member.decorators) :\n          [];\n      for (const {name} of ngDecorators) {\n        if (DIRECTIVE_FIELD_DECORATORS.has(name)) {\n          return InferredKind.DIRECTIVE;\n        }\n      }\n\n      // If the class declares any of the lifecycle hooks that do not guarantee that\n      // the given class is a directive, update the kind and continue looking for other\n      // members that would unveil a more specific kind (i.e. being a directive).\n      if (propertyName !== null && AMBIGUOUS_LIFECYCLE_HOOKS.has(propertyName)) {\n        usage = InferredKind.AMBIGUOUS;\n      }\n    }\n\n    return usage;\n  }\n\n  /**\n   * Checks whether a given class has been reported as ambiguous in previous\n   * migration run. e.g. when build targets are migrated first, and then test\n   * targets that have an overlap with build source files, the same class\n   * could be detected as ambiguous.\n   */\n  private _hasBeenReportedAsAmbiguous(node: ts.ClassDeclaration): boolean {\n    const sourceFile = node.getSourceFile();\n    const leadingComments = ts.getLeadingCommentRanges(sourceFile.text, node.pos);\n    if (leadingComments === undefined) {\n      return false;\n    }\n    return leadingComments.some(\n        ({kind, pos, end}) => kind === ts.SyntaxKind.SingleLineCommentTrivia &&\n            sourceFile.text.substring(pos, end).includes(`TODO: ${AMBIGUOUS_CLASS_TODO}`));\n  }\n}\n"]}