Optimize webpack rebuild speed

Derived from facebook#4492 (comment)
Timer · Sep 22, 2018 · 84de53e · 84de53e
1 parent 2150693
commit 84de53e
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Showing 3 changed files with 9 additions and 3 deletions.
diff --git a/packages/react-dev-utils/FileSizeReporter.js b/packages/react-dev-utils/FileSizeReporter.js
@@ -28,7 +28,7 @@ function printFileSizesAfterBuild(
  var assets = (webpackStats.stats || [webpackStats])
  .map(stats =>
  stats
- .toJson()
+ .toJson({ all: false, assets: true })
  .assets.filter(asset => /\.(js|css)$/.test(asset.name))
  .map(asset => {
  var fileContents = fs.readFileSync(path.join(root, asset.name));

diff --git a/packages/react-dev-utils/WebpackDevServerUtils.js b/packages/react-dev-utils/WebpackDevServerUtils.js
@@ -150,7 +150,11 @@ function createCompiler(webpack, config, appName, urls, useYarn) {
  // We have switched off the default Webpack output in WebpackDevServer
  // options so we are going to "massage" the warnings and errors and present
  // them in a readable focused way.
- const messages = formatWebpackMessages(stats.toJson({}, true));
+ // We only construct the warnings and errors for speed:
+ // https://github.com/facebook/create-react-app/issues/4492#issuecomment-421959548
+ const messages = formatWebpackMessages(
+ stats.toJson({ all: false, warnings: true, errors: true })
+ );
  const isSuccessful = !messages.errors.length && !messages.warnings.length;
  if (isSuccessful) {
  console.log(chalk.green('Compiled successfully!'));

diff --git a/packages/react-scripts/scripts/build.js b/packages/react-scripts/scripts/build.js
@@ -142,7 +142,9 @@ function build(previousFileSizes) {
  if (err) {
  return reject(err);
  }
- const messages = formatWebpackMessages(stats.toJson({}, true));
+ const messages = formatWebpackMessages(
+ stats.toJson({ all: false, warnings: true, errors: true })
+ );
  if (messages.errors.length) {
  // Only keep the first error. Others are often indicative
  // of the same problem, but confuse the reader with noise.