Method copyFile

packages/testlab/src/test-sandbox.ts:137–158

* Copies a file from src to the TestSandbox. If copying a `.js` file which * has an accompanying `.js.map` file in the src file location, the dest file * will have its sourceMappingURL updated to point to the original file as * an absolute path so you don't need to copy the map file. *

(
    src: string,
    dest?: string,
    transform?: (content: string) => string,
  )

   * @param transform - Optional. A function to transform the file content.
   */
  async copyFile(
    src: string,
    dest?: string,
    transform?: (content: string) => string,
  ): Promise<void> {
    dest = dest
      ? resolve(this.path, dest)
      : resolve(this.path, parse(src).base);

    if (transform == null) {
      await copy(src, dest);
    } else {
      let content = await readFile(src, 'utf-8');
      content = transform(content);
      await outputFile(dest, content, {encoding: 'utf-8'});
    }

    if (parse(src).ext === '.js' && (await pathExists(src + '.map'))) {
      const srcMap = src + '.map';
      await appendFile(dest, `\n//# sourceMappingURL=${srcMap}`);
    }
  }

  /**
   * Creates a new file and writes the given data serialized as JSON.