🔎 Search Terms

compiler api, template tag, jsdoc constraint

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about the compiler API

⏯ Playground Link

https://ts-ast-viewer.com/#code/PQKhCgAIUgBAXApgWwA4BsCGTIG8B2ArsgEaIBOAvpACpQwICeqiAJogGZ43U3Nv1gQA

💻 Code

/**
 * @template {number} T
 * @typedef {T} Typed
 */

🙁 Actual behavior

templateTag.typeParameters[0].constraint is undefined

🙂 Expected behavior

templateTag.typeParameters[0].constraint should be a number type, the equivalent TS type parameter works as expected:

type Typed<T extends number> = T

Additional information about the issue

I mentioned this in the TS Discord, @jakebailey confirmed it looks like a likely bug

Originally reported in: TypeStrong/typedoc#2384