TypeScript Version: 3.6.3, 3.7-Beta

Search Terms:

• generic function infer return type
• generic function destructure

Code

Minimal reproducible example:

interface TestGeneric<TG> {
  f: string
  g: TG
}

const removeF = <TX>({ f, ...rest }: TestGeneric<TX>) => {
  return rest
}

const result: number = removeF<number>({ f: '', g: 3 }).g

Expected behavior:

No type errors

Actual behavior:

Type 'TX' is not assignable to type 'number'

Playground Link:
https://www.typescriptlang.org/play/index.html?ts=3.7-Beta&ssl=10&ssc=58&pln=1&pc=1#code/JYOwLgpgTgZghgYwgAgCoQM5gOIRNYBAHlWwD5kBvAWAChlkYAuZLKUAczoY5dLoC+dOggD2ILMigQAtqIBuEAGLIAvMhIANMgApKjADTIAdKemSBfTDjwFiqbQEo1FGvSkQwAVyggPWQWFaMQkwfy8AGzAWEC8ZACNoNQ85RSUiWIToXX1mZAByfKNeZABmZAFHYy5aIA

Related Issues: #33579 #28234