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webpack v5.0.0-rc.1 Release Notes

Release Date: 2020-09-28 // over 3 years ago

  • 💥 Breaking Changes

    • 0️⃣ uses target: "browserslist" as default when a browserslist config has been found, otherwise fallback to target: "web" as usual
      • This could have unexpected changed to the EcmaScript version of the generated code
      • In same cases this might causes builds to fail because browserslist contain web and node versions
      • In most cases we expect this to simplify migration while still allowing to generate better code
      • This partially reverts a breaking change: Instead of changing the generated code from ES5 to ES6, this now changes it from ES5 to an automatic version depending on browserslist when available

    🔋 Features

    • ➕ add support for target: "browserslist" and more advanced options
    • 🔦 expose more classes as needed by plugins
    • ➕ add Compiler.watching
    • ➕ add parser.worker for javascript files to allow to modify which syntax is special for WebWorker support
    • 👍 allow output.chunkFilename to be a function via schema
    • 👍 allow RegExp for watchOptions.ignored via schema
    • ➕ add resolve.preferRelative option, which allows to resolve module requests also as relative requests

    Migration

    • ➕ add more hints regarding breaking changes in config
    • 👌 improve deprecation layer for Array -> Set to allow accessing the first index
    • 👍 allow to use splitChunks name to move modules to an parent chunk

    🛠 Bugfixes

    • avoid some errors in dependencies when target module failed
    • when min(Remaingin)Size is violated, use only modules that are fine, instead of failing for all modules
    • 🛠 fix infinite recursion when having a circular symlink and a context containing it
    • ⚠ warning for importing an disposed module displays the correct module
    • 🛠 fix too wide hash for javascript chunks that caused unnecessary invalidation of the rendered files
    • 🛠 fix new URL("relative/file.png", import.meta.url) to resolve relative
    • ⚡️ update webpack-sources to fix crash with source "." is not in SourceMap
    • 🛠 fix stack overflow in resolving