Isolated Declarations Emit

Oxc transformer supports emitting TypeScript declarations without using the TypeScript compiler for projects with isolated declarations enabled.

Example

Input:

export function foo(a: number, b: string): number {
  return a + Number(b);
}

export enum Bar {
  a,
  b,
}

Output:

export declare function foo(a: number, b: string): number;
export declare enum Bar {
  a = 0,
  b = 1,
}

Usage

import { isolatedDeclaration } from "oxc-transform";

const result = await isolatedDeclaration("lib.ts", sourceCode, {
  sourcemap: false,
  stripInternal: false,
});

console.log(result.code); // the .d.ts content
console.log(result.map); // the source map (if sourcemap is enabled)
console.log(result.errors); // parse and transformation errors

A synchronous isolatedDeclarationSync variant is also available with the same signature.