What does "Assert" mean?

[ronag]

The standard often mentions Assert {condition} but is unclear what exactly that means?

e.g. in https://fetch.spec.whatwg.org/#bodyinit-safely-extract

it says Assert: object is neither disturbed nor locked.. If the condition fails what should happen? Throw an error? What kind of error?

Refs: https://github.com/nodejs/undici/blob/main/lib/api/api-fetch.js#L324-L332

[annevk]

See https://infra.spec.whatwg.org/#assertions. I suppose we could consider cross-referencing that.

[ronag]

Thanks!