Function checkForOverwrite

src/cli/task-generate.ts:194–212

(files: readonly BoilerplateFile[], config: ValidatedConfig)

 * @param config the Config object, used here to get access to `sys.readFile`
 */
const checkForOverwrite = async (files: readonly BoilerplateFile[], config: ValidatedConfig): Promise<void> => {
  const alreadyPresent: string[] = [];

  await Promise.all(
    files.map(async ({ path }) => {
      if ((await config.sys.readFile(path)) !== undefined) {
        alreadyPresent.push(path);
      }
    }),
  );

  if (alreadyPresent.length > 0) {
    config.logger.error(
      'Generating code would overwrite the following files:',
      ...alreadyPresent.map((path) => '\t' + normalizePath(path)),
    );
    await config.sys.exit(1);
  }
};

/**
 * Check if an extension is for a test