Method addImport

packages/core/schematics/utils/change_tracker.ts:119–144

* Adds an import to a file. * @param sourceFile File to which to add the import. * @param symbolName Symbol being imported. * @param moduleName Module from which the symbol is imported. * @param alias Alias to use for the import.

(
    sourceFile: ts.SourceFile,
    symbolName: string,
    moduleName: string,
    alias?: string,
  )

   * @param alias Alias to use for the import.
   */
  addImport(
    sourceFile: ts.SourceFile,
    symbolName: string,
    moduleName: string,
    alias?: string,
  ): ts.Expression {
    if (this._importRemapper) {
      moduleName = this._importRemapper(moduleName, sourceFile.fileName);
    }

    // It's common for paths to be manipulated with Node's `path` utilties which
    // can yield a path with back slashes. Normalize them since outputting such
    // paths will also cause TS to escape the forward slashes.
    moduleName = normalizePath(moduleName);

    if (!this._changes.has(sourceFile)) {
      this._changes.set(sourceFile, []);
    }

    return this._importManager.addImport({
      requestedFile: sourceFile,
      exportSymbolName: symbolName,
      exportModuleSpecifier: moduleName,
      unsafeAliasOverride: alias,
    });
  }

  /**
   * Removes an import from a file.