config/jestEsbuildTransform.js


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import { transform } from 'esbuild';

import { node } from './buildConstants.js';

export default {
  /**
   * @param {string} source
   * @param {string} filePath
   * @param {import('@jest/types').Config.GlobalConfig} jestConfig
   * @return {Promise<import('@jest/types').TransformTypes.TransformResult>}
   */
  async processAsync(source, filePath) {
    const { code } = await transform(source, {
      loader: filePath.endsWith('tsx') ? 'tsx' : 'ts',
      sourcefile: filePath,
      format: 'esm',
      target: node,
      sourcemap: 'inline',
    });
    return {
      code,
      originalCode: source,
      sourceMapPath: null,
    };
  },
};