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JSDoc tuple typedef with optional elements became null #38747

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@chancancode

Description

@chancancode

TypeScript Version: 3.7.x-dev.201xxxxx

Search Terms:
JSDoc tuple optional

Code

In JavaScript:

/**
 * @typedef {[number, number?]} Args
 * 
 * @type {Args}
 */
let args;

In TypeScript:

let args: [number, number?];

Expected behavior:

The args variable should have the same type in both cases.

Actual behavior:

  • In JavaScript: [number, number | null]
  • In TypeScript: [number, (number | undefined)?]

Playground Link:

Related Issues: None

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