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Prioritize ES5 (main) over ES6 (module) in webpack resolve.mainFields config [build failures are irrelevant] #5005

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Prioritize ES5 (main) over ES6 (module) in webpack resolve.mainFields config [build failures are irrelevant] #5005

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3 changes: 3 additions & 0 deletions packages/react-scripts/config/webpack.config.dev.js
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,9 @@ module.exports = {
// It is guaranteed to exist because we tweak it in `env.js`
process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
),
// Since create-react-app doesn't support all ES6 features in dependencies,
// prefer to load the ES5 instead of the ES6 if a package provides both.
mainFields: ['browser', 'main', 'module'],
// These are the reasonable defaults supported by the Node ecosystem.
// We also include JSX as a common component filename extension to support
// some tools, although we do not recommend using it, see:
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3 changes: 3 additions & 0 deletions packages/react-scripts/config/webpack.config.prod.js
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Original file line number Diff line number Diff line change
Expand Up @@ -175,6 +175,9 @@ module.exports = {
// It is guaranteed to exist because we tweak it in `env.js`
process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
),
// Since create-react-app doesn't support all ES6 features in dependencies,
// prefer to load the ES5 over the ES6 if a package provides both.
mainFields: ['browser', 'main', 'module'],
// These are the reasonable defaults supported by the Node ecosystem.
// We also include JSX as a common component filename extension to support
// some tools, although we do not recommend using it, see:
Expand Down