microsoft / microsoft/TypeScript
Flow type helpers
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Description
Flow offer some nice type helpers in his recent versions, while some of them are already addressed by typescript, some could perhaps be helpful.
Here are extracted comments from flow source just for inspiration.
- $Either<...T> is the union of types ...T
- $All<...T> is the intersection of types ...T
- $Supertype acts as any over supertypes of T
- $Subtype acts as any over subtypes of T
- $Shape matches the shape of T
- $Diff<T,S>
- $Enum is the set of keys of T
- $Record is the type of objects whose keys are those of T
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
No source file, test, or entry point is named. Start by comparing the listed Flow helpers with TypeScript's existing type-system features and the issue discussion; done requires an agreed helper scope, specified behavior, and corresponding implementation and tests.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100