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Function call gives bogus error about type arguments when real problem is a missing argument #25683

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mattmccutchen opened this issue Jul 16, 2018 · 1 comment
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Function call gives bogus error about type arguments when real problem is a missing argument #25683

mattmccutchen opened this issue Jul 16, 2018 · 1 comment
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@sandersn
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Bug A bug in TypeScript Domain: Error Messages The issue relates to error messaging Fixed A PR has been merged for this issue
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TypeScript 3.1

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@mattmccutchen
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TypeScript Version: master (60986ad)

Search Terms: "expected" "type arguments but got"

Code

function f<A, B = {}>(arg: number) {}
f<number>();

Expected behavior: Error: Expected 1 arguments, but got 0.

Actual behavior: Error: Expected 1-2 type arguments, but got 1.

Playground Link: link

Related Issues: #19374
@DanielRosenwasser DanielRosenwasser added the Domain: Error Messages The issue relates to error messaging label Jul 16, 2018
@DanielRosenwasser DanielRosenwasser added this to the TypeScript 3.1 milestone Jul 16, 2018
@DanielRosenwasser DanielRosenwasser added the Bug A bug in TypeScript label Jul 16, 2018
mattmccutchen added a commit to mattmccutchen/TypeScript that referenced this issue Jul 17, 2018
@mattmccutchen
Check for optional type parameters before issuing a "wrong number of
bd84179 
type arguments" error on a function call.

Fixes microsoft#25683.
@mattmccutchen mattmccutchen mentioned this issue Jul 17, 2018
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@mattmccutchen
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Easy fix up at #25733.

@mhegazy mhegazy added the Fixed A PR has been merged for this issue label Jul 17, 2018
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Bug A bug in TypeScript Domain: Error Messages The issue relates to error messaging Fixed A PR has been merged for this issue
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@sandersn @DanielRosenwasser @mhegazy @mattmccutchen