v0.13.3

• Support TypeScript type-only import/export specifiers (#1637)

  This release adds support for a new TypeScript syntax feature in the upcoming version 4.5 of TypeScript. This feature lets you prefix individual imports and exports with the type keyword to indicate that they are types instead of values. This helps tools such as esbuild omit them from your source code, and is necessary because esbuild compiles files one-at-a-time and doesn't know at parse time which imports/exports are types and which are values. The new syntax looks like this:

  // Input TypeScript code
  import { type Foo } from 'foo'
  export { type Bar }
  
  // Output JavaScript code (requires "importsNotUsedAsValues": "preserve" in "tsconfig.json")
  import {} from "foo";
  export {};

  See microsoft/TypeScript#45998 for full details. From what I understand this is a purely ergonomic improvement since this was already previously possible using a type-only import/export statements like this:

  // Input TypeScript code
  import type { Foo } from 'foo'
  export type { Bar }
  import 'foo'
  export {}
  
  // Output JavaScript code (requires "importsNotUsedAsValues": "preserve" in "tsconfig.json")
  import "foo";
  export {};

  This feature was contributed by @g-plane.