Bug Report

🔎 Search Terms

branded, interpolation, 5.1.3

🕗 Version & Regression Information

This changed between versions 5.0.4 and 5.1.3

⏯ Playground Link

Playground link with relevant code

💻 Code

type S = `id_${string & {_brand: "ID"}}`;
//   ^? type S = `id_${string & { _brand: "ID"; }}`
declare const id: string & {_brand: "ID"};
const s = `id_${id}` as const;
//    ^? const s: `id_${string & { _brand: "ID"; }}`

🙁 Actual behavior

The intersected brand is preserved during string interpolation for variables and types!

🙂 Expected behavior

Pre 5.1.3, the intersected brand always got removed during string interpolation for variables and types.

This is part bug report and question. My question being in future versions, will this behavior be preserved? I wrote a clunky generic function and type to do this exact thing because I found it valuable, but I'd much rather rely on native behavior if this is going to stick around 👀