JSDoc equivalent to Typescript's `as const`?

Issue

I'm in an old project that is too huge to easily convert to Typescript, so I've been using JSDoc instead. The Typescript feature that I can't figure out how to replicate in JSDoc is using as const to fully type the property names and values of a static object.

// In Typescript
const anObject = {hello: 'world'} as const;
// (type shows as {hello:'world'} instead of {hello:string}

Is there any equivalent for this in JSDoc? I've been completely unable to find anything that does this (@readonly and @const don't do it), so instead I have to basically copy-paste any static object as a type to be able to properly type these cases, which certainly isn't DRY.

Solution

Since Typescript 4.5:

const foo = /** @type {const} */ ({x: 1});
const bar = /** @type {const} */ ("baz");

Note that the parentheses are required; this is cast syntax, not normal type annotation.

Answered By - ZachB