angular-cn/packages/core/schematics/migrations/injectable-pipe/util.ts

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/**
* @license
* Copyright Google Inc. 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 * as ts from 'typescript';
/** Name of the Injectable decorator. */
export const INJECTABLE_DECORATOR_NAME = 'Injectable';
/**
* Adds an import to a named import node, if the import does not exist already.
* @param node Node to which to add the import.
* @param importName Name of the import that should be added.
*/
export function addImport(node: ts.NamedImports, importName: string) {
const elements = node.elements;
const isAlreadyImported = elements.some(element => element.name.text === importName);
if (!isAlreadyImported) {
return ts.updateNamedImports(
node, [...elements, ts.createImportSpecifier(undefined, ts.createIdentifier(importName))]);
}
return node;
}
/** Gets the named imports node from an import declaration. */
export function getNamedImports(node: ts.ImportDeclaration): ts.NamedImports|null {
const importClause = node.importClause;
const namedImports = importClause && importClause.namedBindings;
return (namedImports && ts.isNamedImports(namedImports)) ? namedImports : null;
}