message: Ensure component index has been written before renaming
  This ensures we correctly wait for `component-index.js.tmp` to be written to
  disk before trying to rename into place. This fixes an issue where stray temp
  files were being strewn about the repos after renaming failures.
diff: const fs = require('fs');
  const path = require('path');
  const glob = require('glob');
  +const util = require('util');
  const args = require('minimist')(process.argv);
  const chokidar = require('chokidar');
  @@ -12,7 +13,7 @@ const componentJsGlob = '**/*.js';
  const componentTsGlob = '**/*.tsx';
  let prevFiles = [];
  -function reskindex() {
  +async function reskindex() {
  const jsFiles = glob.sync(componentJsGlob, {cwd: componentsDir}).sort();
  const tsFiles = glob.sync(componentTsGlob, {cwd: componentsDir}).sort();
  const files = [...tsFiles, ...jsFiles];
  @@ -51,7 +52,8 @@ function reskindex() {
  }
  strm.write("export {components};\n");
  - strm.end();
  + // Ensure the file has been fully written to disk before proceeding
  + await util.promisify(strm.end);
  fs.rename(componentIndexTmp, componentIndex, function(err) {
  if (err) {
  console.error("Error moving new index into place: " + err);
  