Function getFileTransformFunction

src/util/transform.ts:115–128

* Retrieves a transform function from a file, supporting both JavaScript and Python. * @param filePath - The path to the file, including the 'file://' prefix. * @returns A Promise resolving to the requested function. * @throws Error if the file format is unsupported.

(filePath: string)

 * @throws Error if the file format is unsupported.
 */
async function getFileTransformFunction(filePath: string): Promise<Function> {
  const [actualFilePath, functionName] = parseFilePathAndFunctionName(
    filePath.slice('file://'.length),
  );

  const fullPath = safeJoin(cliState.basePath || '', actualFilePath);

  if (isJavascriptFile(fullPath)) {
    return getJavascriptTransformFunction(fullPath, functionName);
  } else if (fullPath.endsWith('.py')) {
    return getPythonTransformFunction(fullPath, functionName);
  }
  throw new Error(`Unsupported transform file format: file://${actualFilePath}`);
}

/**
 * Creates a function from inline JavaScript code.