Comparison operators ("<", ">") incorrectly interpreted as type parameters
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 48/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- typescript
- Domain
- tooling
Research direction
Start with the TypeScript and JavaScript Grammar Extension and reproduce the reported snippet in VS Code using the syntax scopes shown in the issue. Trace how the comparison operators are classified in the grammar; done means < and > remain comparison operators while the surrounding type assertion and property access receive normal highlighting.
Written by the indexing model from the issue text.
Description
TS and JS Grammar Extension version: 0.0.55 / latest
Code
// Contrived because of simplification
let a = 7
let b = {}
if (a < (b as {c: number}).c || a > (b as {c: number}).c) {
}
If statement parsing:
if [keyword.control.conditional.ts, source.ts]
( [meta.brace.round.ts, source.ts]
a [entity.name.function.ts, meta.function-call.ts, source.ts]
< [punctuation.definition.typeparameters.begin.ts, meta.type.parameters.ts, source.ts]
( [meta.brace.round.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
b [entity.name.type.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
as [entity.name.type.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
{ [punctuation.definition.block.ts, meta.object.type.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
c [variable.object.property.ts, meta.definition.property.ts, meta.field.declaration.ts, meta.object.type.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
: [meta.type.annotation.ts, meta.field.declaration.ts, meta.object.type.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
number [support.type.primitive.ts, meta.type.annotation.ts, meta.field.declaration.ts, meta.object.type.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
} [punctuation.definition.block.ts, meta.object.type.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
) [meta.brace.round.ts, meta.type.paren.cover.ts, meta.type.parameters.ts, source.ts]
. [meta.type.parameters.ts, source.ts]
c [entity.name.type.ts, meta.type.parameters.ts, source.ts]
| [keyword.operator.type.ts, meta.type.parameters.ts, source.ts]
| [keyword.operator.type.ts, meta.type.parameters.ts, source.ts]
a [entity.name.type.ts, meta.type.parameters.ts, source.ts]
> [punctuation.definition.typeparameters.begin.ts, meta.type.parameters.ts, source.ts]
(rest is normal)
So like:
if ( a<type>(parameters).c ) {}
Example in vscode:

Actual code:

- Dominant language
- TypeScript
- Stars
- 471
- Forks
- 149
- PR merge metrics
- No merged PRs in 30d
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