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Summary:
We are transforming the following utility types to be more consistent with typescript and better AI integration:

  • $NonMaybeType -> NonNullable
  • $ReadOnly -> Readonly
  • $ReadOnlyArray -> ReadonlyArray
  • $ReadOnlyMap -> ReadonlyMap
  • $ReadOnlySet -> ReadonlySet
  • $Keys -> keyof
  • $Values -> Values
  • mixed -> unknown

See details in https://fb.workplace.com/groups/flowlang/permalink/1837907750148213/.

drop-conflicts

Command:

js1 flow-runner codemod flow/transformUtilityType --legacy-type='$ReadOnlyArray'

Reviewed By: SamChou19815

Differential Revision: D90402950

@meta-cla meta-cla bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Jan 10, 2026
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meta-codesync bot commented Jan 10, 2026

@marcoww6 has exported this pull request. If you are a Meta employee, you can view the originating Diff in D90402950.

Summary:
Pull Request resolved: facebook#55109

We are transforming the following utility types to be more consistent with typescript and better AI integration:

* `$NonMaybeType` -> `NonNullable`
* `$ReadOnly` -> `Readonly`
* `$ReadOnlyArray` -> `ReadonlyArray`
* `$ReadOnlyMap` -> `ReadonlyMap`
* `$ReadOnlySet` -> `ReadonlySet`
* `$Keys` -> `keyof`
* `$Values` -> `Values`
* `mixed` -> `unknown`

See details in https://fb.workplace.com/groups/flowlang/permalink/1837907750148213/.

drop-conflicts

Command:

`js1 flow-runner codemod flow/transformUtilityType --legacy-type='$ReadOnlyArray'`

Reviewed By: SamChou19815

Differential Revision: D90402950
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2 participants