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

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