core-dts

TypeScript will support all proposals above stage-3.
But there are always some gap between TypeScript support and proposal progress.
And sometimes we want to use proposals within stage-3 (e.g. Iterator helper) because we may use polyfill.

In this case, we have to write those declarations by our own. But with core-dts, we can use these proposal with additional declaration files.

Install

pnpm add core-dts -D

Setup

Set add core-dts into types in compiler options.

{
  "compilerOptions": {
    "types": ["core-dts"]
  }
}

Proposals

Default proposals are above stage-3. If you want to use something like stage-2 proposal.

{
  "compilerOptions": {
    "types": ["core-dts/src/proposals/stage-2"]
  }
}

Or you want to use some specific proposal.

{
  "compilerOptions": {
    "types": ["core-dts/src/proposals/stage-2/iterator-helper.d.ts"]
  }
}

Features

• [x] Finished proposals
  • [x] Array find from last
• [x] Stage 3 proposals
  • [x] Array grouping
  • [x] Change Array by copy
• [x] Stage 2 proposals
  • [x] Iterator helpers
  • [x] New Set methods
  • [x] Map.prototype.emplace
  • [x] Array.fromAsync
  • [x] Array.isTemplateObject
  • [x] Symbol.{ asyncDispose, dispose } for using statement
  • [x] Symbol.metadataKey for decorators metadata proposal
• [x] Stage 1 proposals
  • [x] Observable
  • [x] New collections methods
  • [x] .of and .from methods on collection constructors
  • [x] compositeKey and compositeSymbol
  • [x] Array filtering
  • [x] Array deduplication
  • [x] Getting last item from Array
  • [x] Number.range
  • [x] Number.fromString
  • [x] Math extensions
  • [x] Math.signbit
  • [x] String.cooked
  • [x] String.prototype.codePoints
  • [x] Symbol.matcher for pattern matching
• [x] Stage 0 proposals
  • [x] Function.prototype.unThis
  • [x] Function.{ isCallable, isConstructor }