immutable-js/immutable-js v4.0.0-rc.10

on GitHub

It's been a long time since the last release candidate, but quite a bit of work has happened since the last once. One step closer to a final release!

Breaking:

• Remove IteratorSequence. Do not attempt to detect iterators in Seq(). (#1589)

  Iterables can still be provided to Seq(), and most Iterators are also
  Iterables, so this change should not affect the vast majority of uses.
  For more information, see PR #1589

• Node buffers no longer considered value-equal

  This was actually broken as of v4.0.0-rc.1 (2dcf3ef)
  but was highlighted as a breaking change by (#1437)

New:

• Top level predicate functions (#1600)

  New functions are exported from the immutable module:
  isSeq(), isList(), isMap(), isOrderedMap(), isStack(), isSet(), isOrderedSet(), and isRecord().

• Support Typescript 3 (#1593)
• Support latest Flow (#1531)
• Add RecordOf<TProps> type alias for TypeScript, matching Flow (#1578)
• Improved Flow support for Record subclasses (still not advised) (#1414)
• Improve performance of toJS (#1581)

  Cursory test is >10% faster than both v3.8.2 and v4.0.0-rc.7,
  and corrects the regression since v4.0.0-rc.9.

• Added optional notSetValue in first() and last() (#1556)
• Enable flow strict (#1580)
• Make isArrayLike check more precise to avoid false positives (#1520)
• map() for List, Map, and Set returns itself for no-ops (#1455) (5726bd1)
• Hash functions as objects, allowing functions as values in collections (#1485)

Fix:

• groupBy no longer returns a mutable Map instance (#1602)
• Fix issue where refs can recursively collide, corrupting .size (#1598)
• Throw error in mergeWith() method if missing the required merger function (#1543)
• Update isPlainObj() to workaround Safari bug and allow cross-realm values (#1557)
• The mergeDeepWith merger is untypable in TS/Flow. (#1532)
• Fix missing "& T" to some methods in RecordInstance (#1464)
• Make notSetValue optional for typed Records (#1461) (a1029bb)
• Export type of RecordInstance (#1434)
• Fix Record size check in merge() (#1521)
• Fix Map#concat being not defined (#1402)