type checking `.js` files using `d.ts` files

would it be possible to type check javascript files using d.tsd.ts files?

// add.js
/// <reference types="./add.d.ts" />
const add = (a) => a + 1

// add.js
/// <reference types="./add.d.ts" />
const add = (a) => a + 1

// add.d.ts
export declare const add: (a: number) => number

// add.d.ts
export declare const add: (a: number) => number

importing addadd from add.jsadd.js from consumer will type check but

Deno•2y ago

type checking `.js` files using `d.ts` files

would it be possible to type check javascript files using d.tsd.ts files?

// add.js
/// <reference types="./add.d.ts" />
const add = (a) => a + 1

// add.js
/// <reference types="./add.d.ts" />
const add = (a) => a + 1

// add.d.ts
export declare const add: (a: number) => number

// add.d.ts
export declare const add: (a: number) => number

importing addadd from add.jsadd.js from consumer will type check but

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