/**
 * @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 {Tree} from '@angular-devkit/schematics';

/** Gets the content of a specified file from a schematic tree. */
export function getFileContent(tree: Tree, filePath: string): string {
  const contentBuffer = tree.read(filePath);

  if (!contentBuffer) {
    throw new Error(`Cannot read "${filePath}" because it does not exist.`);
  }

  return contentBuffer.toString();
}