sourcecred/config/jest/fileTransform.js

// @flow
const path = require("path");

// This is a custom Jest transformer turning file imports into filenames.
// http://facebook.github.io/jest/docs/en/webpack.html

module.exports = {
  process(src /*: string */, filename /*: string */) {
    return `module.exports = ${JSON.stringify(path.basename(filename))};`;
  },
};