code: function resolveFilename(fileName, cwd = process.cwd()) {
    try {
      const parent = new Module();
  
      // eslint-disable-next-line no-underscore-dangle
      parent.paths = Module._nodeModulePaths(cwd);
  
      // eslint-disable-next-line no-underscore-dangle
      return Module._resolveFilename(fileName, parent);
    } catch (error) {
      if (error.code === "MODULE_NOT_FOUND") {
        console.warn(format("babel-plugin-direct-import: %s", error.message));
  
        return null;
      }
  
      throw error;
    }
  }
docs: Resolve module file.
  
  @param {String} fileName
  @param {String} cwd
  @returns {String|null}