/**
 * @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 * as ts from 'typescript';

export function parseTsconfigFile(tsconfigPath: string, basePath: string): ts.ParsedCommandLine {
  const {config} = ts.readConfigFile(tsconfigPath, ts.sys.readFile);
  const parseConfigHost = {
    useCaseSensitiveFileNames: ts.sys.useCaseSensitiveFileNames,
    fileExists: ts.sys.fileExists,
    readDirectory: ts.sys.readDirectory,
    readFile: ts.sys.readFile,
  };

  return ts.parseJsonConfigFileContent(config, parseConfigHost, basePath, {});
}