Download Latest Version 3.49.0 - 2026.03.16 source code.tar.gz (1.3 MB)
Email in envelope

Get an email when there's a new version of core-js

Home / v3.48.0
Name Modified Size InfoDownloads / Week
Parent folder
3.48.0 - 2026.01.21 source code.tar.gz 2026-01-21 1.3 MB
0
3.48.0 - 2026.01.21 source code.zip 2026-01-21 2.8 MB
0
README.md 2026-01-21 2.6 kB
0
Totals: 3 Items   4.1 MB 0
  • Changes v3.47.0...v3.48.0 (126 commits)
  • Map upsert proposal:
  • Built-ins:
    • Map.prototype.getOrInsert
    • Map.prototype.getOrInsertComputed
    • WeakMap.prototype.getOrInsert
    • WeakMap.prototype.getOrInsertComputed
  • Moved to stable ES, January 2026 TC39 meeting
  • Added es. namespace modules, /es/ and /stable/ namespaces entries
  • Use CreateDataProperty / CreateDataPropertyOrThrow in some missed cases, #1497
  • Minor fix / optimization in the RegExp constructor (NCG and dotAll) polyfill
  • Added some more workarounds for a Safari < 13 bug with silent ignore of non-writable array .length
  • Added detection of a Webkit bug: Iterator.prototype.flatMap throws on iterator without return method
  • Added detection of a V8 ~ Chromium < 144 bug: Uint8Array.prototype.setFromHex throws an error on length-tracking views over ResizableArrayBuffer
  • Compat data improvements:
  • Map upsert proposal features marked as shipped in V8 ~ Chrome 145
  • Joint iteration proposal features marked as shipped in FF148
  • Iterator.concat (github.com) marked as shipped in Bun 1.3.7
  • Added Rhino 1.9.0 compat data
  • Added Deno 2.6 compat data mapping
  • Added Opera Android 93 and 94 compat data mapping
  • Added Electron 41 compat data mapping
  • Iterator.prototype.flatMap marked as supported from Safari 26.2 and Bun 1.2.21 because of a bug: throws on iterator without return method
  • Uint8Array.prototype.setFromHex marked as supported from V8 ~ Chromium 144 because of a bug: throws an error on length-tracking views over ResizableArrayBuffer
Source: README.md, updated 2026-01-21