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Filename : transform.js
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const babel = require("@babel/core");
const {
  promisify
} = require("util");
const LoaderError = require("./Error");
const transform = promisify(babel.transform);
module.exports = async function (source, options) {
  let result;
  try {
    result = await transform(source, options);
  } catch (err) {
    throw err.message && err.codeFrame ? new LoaderError(err) : err;
  }
  if (!result) return null;

  // We don't return the full result here because some entries are not
  // really serializable. For a full list of properties see here:
  // https://github.com/babel/babel/blob/main/packages/babel-core/src/transformation/index.js
  // For discussion on this topic see here:
  // https://github.com/babel/babel-loader/pull/629
  const {
    ast,
    code,
    map,
    metadata,
    sourceType,
    externalDependencies
  } = result;
  if (map && (!map.sourcesContent || !map.sourcesContent.length)) {
    map.sourcesContent = [source];
  }
  return {
    ast,
    code,
    map,
    metadata,
    sourceType,
    // Convert it from a Set to an Array to make it JSON-serializable.
    externalDependencies: Array.from(externalDependencies || [])
  };
};
module.exports.version = babel.version;