/**
 * @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 ts from 'typescript';

import {CompilerHost, CompilerOptions} from './api';

let wrapHostForTest: ((host: ts.CompilerHost) => ts.CompilerHost)|null = null;

export function setWrapHostForTest(wrapFn: ((host: ts.CompilerHost) => ts.CompilerHost)|
                                   null): void {
  wrapHostForTest = wrapFn;
}

export function createCompilerHost(
    {options, tsHost = ts.createCompilerHost(options, true)}:
        {options: CompilerOptions, tsHost?: ts.CompilerHost}): CompilerHost {
  if (wrapHostForTest !== null) {
    tsHost = wrapHostForTest(tsHost);
  }
  return tsHost;
}