Syntax highlighting: generic type arguments are highly affected by whitespace and other irrelevant context

このリポジトリの TypeScript TextMate grammar files から始め、Monokai Pro color scheme を使用して VS Code で Playground example を再現します。issue に示されている空白と周囲のコンテキストの各バリエーションについて、ジェネリック型引数を比較します。完了の条件は、記載された識別子、山括弧、括弧、型引数、数値引数が一貫してハイライトされることです。

🔎 Search Terms

syntax highlighting generics

🕗 Version & Regression Information

This is the behavior in every version I tried, and I reviewed the FAQ for entries about syntax highlighting and generics.

⏯ Playground Link

https://www.typescriptlang.org/play?#code/CYUwxgNghgTiAEAzArgOzAFwJYHtXygCMwAeAQQBp4AhKgYQD4AKASgC540BrVHAd1QAoQWDwBnDAWIAmeAF4ppAIxVpVAMwMR4yUTDr5ikgA0qATSoAtLaNQTFAFkN6SggJAr3a9+sE2digCszsSubqbuFu6WfsK29nBiyBAYSiHKqhrMLHEBickYsgou7p5u3m6+2bl2kvkpBsWhpvAW8NasNQkgSSlOTaTuEW5RbjHV2rUEMDCGANruLirwavCarBSLoe4em27le5Xu2XsuLW0dLKfb+8MjhzFuJ4IAul2SOIQAVoYA3u71VIcJaZNYMeAbAE9ArSYE3XY7CpHJ6QtyA9Rw0jnKzPNHQvqYsLhQ6jMbHSEAX2EAHpqfAAHSMwQYACeAAcEMZDNxeAJmeyEGZuagePwhKyOe1haK+UA

💻 Code

declare function abc<A, B, C>(): unknown

const abc2 = abc<1, 2, 3>
const abc3 = abc<X, Y, Z>
const abc4 = abc<
	1,
	2,
	3
>
const abc5 = abc<
	X,
	Y,
	Z
>

const result1 = abc<1, 2, 3>()

const result2 = abc<
	1,
	2,
	3
>()

const result3 = abc<X, Y, Z>()

const result4 = abc<
	X,
	Y,
	Z
>()

const arr = [
	abc<1, 2, 3>(),
	abc<
		1,
		2,
		3
	>(),
	abc<X, Y, Z>(),
	abc<
		X,
		Y,
		Z
	>(),
]

const obj = {
	result1: abc<1, 2, 3> (),
	result2: abc<
		1,
		2,
		3
	>(),
	result3: abc<X, Y, Z>(),
	result4: abc<
		X,
		Y,
		Z
	>(),
}

🙁 Actual behavior

Declaring a function signature with generics seems to be pretty robust to changes in whitespace and surrounding context, but passing type arguments is extremely brittle.

This is the preceding code sample in VS Code with the Monokai Pro color scheme:

🙂 Expected behavior

Consistent syntax highlighting:

• abc to be consistently green (3/16)
• <> to be consistently gray (3/16)
• () to be consistently gray (8/12)
• X, Y, Z to be consistently blue (3/8)
• 1, 2, 3 to be consistently purple (6/8)

Additional information about the issue

Original issue in monokai-pro-vscode