filter.js
function asyncProcessFileErrorWrapper(e) {
        if (typeof e !== 'object') e = new Error('' + e);
        e.file = relativePath;
        e.treeDir = srcDir;
        throw e;
      }
function asyncProcessFileErrorWrapper(e) {
        if (typeof e !== 'object') e = new Error('' + e);
        e.file = relativePath;
        e.treeDir = srcDir;
        throw e;
      }
TODO(@caitp): error wrapper is for API compat, but is not particularly useful. istanbul ignore next