optimization.noEmitOnErrors: false → optimization.emitOnErrors: true.HashedModuleIdsPlugin → optimization.moduleIds: 'hashed'.NamedChunksPlugin → optimization.chunkIds: 'named'.NamedModulesPlugin → optimization.moduleIds: 'named'.optimization.namedModules: true → optimization.moduleIds: 'named'.optimization.namedChunks: true → optimization.chunkIds: 'named'.optimization.hashedModuleIds: true → optimization.moduleIds: 'hashed'.Update the following options to their new version (if used): Set mode to either production or development to make sure that corresponding defaults are set.

node -trace-deprecation node_modules/webpack/bin/webpack.jsĪs webpack 5 removes all deprecated features, make sure there's no webpack deprecation warnings during the build in order to proceed. You can invoke webpack this way to get stack traces for deprecation warnings to figure out which Plugins and Loaders are responsible. Keep an eye for deprecation warnings during the build. There might be new errors or warnings because of the upgraded versions of webpack, webpack-cli, Plugins and Loaders. Make sure your build has no errors or warnings In such case, it's recommended to update to the latest version that supports webpack 4. Make sure to read release notes of each individual plugin/loader when upgrading it, since latest version might only support webpack 5 and will fail in v4.

Some Plugins and Loaders might have a beta version that has to be used in order to be compatible with webpack 5. Upgrade all used Plugins and Loaders to the latest available version Upgrade webpack-cli to the latest available version (when used) If you are using webpack version less than 4 please see the webpack 4 migration guide. When using webpack >= 4, upgrading to the latest webpack 4 version should not require additional guidance. Upgrade webpack 4 to the latest available version. Upgrade webpack 4 and its plugins/loaders Webpack 5 requires at least Node.js 10.13.0 (LTS), so make sure you upgrade your Node.js if you're still running an older one.

If you are using a higher level tool to run webpack, please refer to the tool for migration instructions. This guide aims to help you migrating to webpack 5 when using webpack directly.

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