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Support production profiling with React Developer Tools #7737

Merged
merged 12 commits into from Oct 3, 2019
Merged

Support production profiling with React Developer Tools #7737

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ee4af55
Added the alias for profiling and output change to keep the className…
JacobMGEvans Sep 26, 2019
46cd4cd
defined isEnvProductionProfile with other isEnv checks
JacobMGEvans Sep 26, 2019
48976fd
moved the keep_classnames and keep_fnames to terserOptions scope
JacobMGEvans Sep 26, 2019
3f3c3bc
resolve merge conflict for yarn.lock.cache
JacobMGEvans Sep 26, 2019
e52c452
revert yarn.lock.cache to master yarn.lock.cache
JacobMGEvans Sep 26, 2019
56d0841
Comment and Boolean Check
JacobMGEvans Sep 26, 2019
dd71838
Replaced env with flag
JacobMGEvans Sep 28, 2019
bc08ea6
documentation in available scripts section with suggested information
JacobMGEvans Sep 30, 2019
6814e38
resolved a local git issue. Fixed documentation error.
JacobMGEvans Sep 30, 2019
0684979
moved documentation to suggested file
JacobMGEvans Oct 2, 2019
94d5839
Update production-build.md
iansu Oct 3, 2019
b2589c0
Merge branch 'master' into feature-profile-issue#7734
iansu Oct 3, 2019
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13 changes: 13 additions & 0 deletions packages/react-scripts/config/webpack.config.js
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Expand Up @@ -66,6 +66,11 @@ module.exports = function(webpackEnv) {
const isEnvDevelopment = webpackEnv === 'development';
const isEnvProduction = webpackEnv === 'production';

// Variable used for enabling profiling in Production
// passed into alias object. Uses a flag if passed into the build command
const isEnvProductionProfile =
isEnvProduction && process.argv.includes('--profile');

// Webpack uses `publicPath` to determine where the app is being served from.
// It requires a trailing slash, or the file assets will get an incorrect path.
// In development, we always serve from the root. This makes config easier.
Expand Down Expand Up @@ -234,6 +239,9 @@ module.exports = function(webpackEnv) {
mangle: {
safari10: true,
},
// Added for profiling in devtools
keep_classnames: isEnvProductionProfile,
keep_fnames: isEnvProductionProfile,
output: {
ecma: 5,
comments: false,
Expand Down Expand Up @@ -303,6 +311,11 @@ module.exports = function(webpackEnv) {
// Support React Native Web
// https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
'react-native': 'react-native-web',
// Allows for better profiling with ReactDevTools
...(isEnvProductionProfile && {
'react-dom$': 'react-dom/profiling',
'scheduler/tracing': 'scheduler/tracing-profiling',
}),
},
plugins: [
// Adds support for installing with Plug'n'Play, leading to faster installs and adding
Expand Down