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TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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[Ts parser bugs] Type casting statement parser error #27183

Closed xieguigang closed 6 years ago

xieguigang commented 6 years ago

TypeScript Version: 3.1.0-dev.201xxxxx

Microsoft Visual Studio Community 2017 Preview Version 15.9.0 Preview 2.0 VisualStudio.15.Preview/15.9.0-pre.2.0+28107.0 Microsoft .NET Framework Version 4.7.03056

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Search Terms:

Type casting statement parser error

Code

return (IEnumerator<Map<string, string>>headers).ToArray();

The type casting statement show above should works, but parser thinks the code is a kind of numeric expression:

ts_parser_error

Expected behavior:

TypeScript parser parse the <type>variable as the type casting expression.

Actual behavior:

The latest typescript parser think it is a numeric math expression

Playground Link:

https://github.com/GCModeller-Cloud/data.ts/blame/3a78b978a32ce32a4a407ee26cd4bd2fed9f1b47/Linq.ts/Linq/DOM/Document.ts#L97

dhruvrajvanshi commented 6 years ago

You aren't using correct syntax for type casting. You did this.

IEnumerator<Map<string, string>>headers // typeheaders

You need to do this

<IEnumerator<Map<string, string>>>headers // <type>headers
xieguigang commented 6 years ago

Oh,yes, many thank for point out my problem.