message: Clarify type in test-polymer.ts
diff: @@ -18,6 +18,7 @@ import * as fs from 'mz/fs';
  import * as path from 'path';
  import {configureAnalyzer, configureConverter} from '../convert-package';
  +import {ConvertedDocumentUrl} from '../url-converter';
  // Install source map support for stack traces, etc.
  require('source-map-support').install();
  @@ -69,9 +70,9 @@ function rework(line: string) {
  const converter = configureConverter(analysis, options);
  const results = await converter.convert();
  const resultPaths = results.keys();
  - const expectedPaths = [
  - ...walkDir(expectedDir)
  - ].map((f) => `./${f}`).filter((f) => f !== './package.json');
  + const expectedPaths = [...walkDir(expectedDir)]
  + .map((f) => `./${f}` as ConvertedDocumentUrl)
  + .filter((f) => f !== './package.json');
  const allPathsUnsorted = new Set([...resultPaths, ...expectedPaths]);
  const allPaths = [...allPathsUnsorted].sort((a, b) => a.localeCompare(b));
  for (const outPath of allPaths) {
  