48 lines
1.7 KiB
TypeScript
48 lines
1.7 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 * as ts from 'typescript';
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/** Name of the Injectable decorator. */
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export const INJECTABLE_DECORATOR_NAME = 'Injectable';
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/**
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* Adds a named import to an import declaration node.
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* @param node Node to which to add the import.
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* @param importName Name of the import that should be added.
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*/
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export function addNamedImport(node: ts.ImportDeclaration, importName: string) {
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const namedImports = getNamedImports(node);
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if (namedImports && ts.isNamedImports(namedImports)) {
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const elements = namedImports.elements;
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const isAlreadyImported = elements.some(element => element.name.text === importName);
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if (!isAlreadyImported) {
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// If there are named imports, there will be an import clause as well.
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const importClause = node.importClause !;
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const newImportClause = ts.createNamedImports(
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[...elements, ts.createImportSpecifier(undefined, ts.createIdentifier(importName))]);
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return ts.updateImportDeclaration(
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node, node.decorators, node.modifiers,
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ts.updateImportClause(importClause, importClause.name, newImportClause),
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node.moduleSpecifier);
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}
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}
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return node;
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}
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/** Gets the named imports node from an import declaration. */
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export function getNamedImports(node: ts.ImportDeclaration): ts.NamedImports|null {
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const importClause = node.importClause;
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const namedImports = importClause && importClause.namedBindings;
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return (namedImports && ts.isNamedImports(namedImports)) ? namedImports : null;
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}
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