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"Feature can only be used in a .ts file." when switching the language mode to TypeScript in a .js file #9670
Description
From Bazyli Brzóska (@niieani) on July 13, 2016 10:45
- VSCode Version: all versions, tested also on latest: 1.4.0-insider 50a0945
- OS Version: OS X 10.11
Steps to Reproduce:
- Create a TypeScript file with a
.jsextension - Change the language mode inside VSCode to "TypeScript" (defaults to JavaScript in files with a
.jsextension) - Add some TypeScript specific code, e.g.
interface ABC {}
Causes an error:
'interface declarations' can only be used in a .ts file.
Mentioned in the discussion here: #7926
Copied from original issue: microsoft/vscode#9199
Activity
dbaeumer commentedon Jul 13, 2016
This is a problem with the TSServer that infers the language mode from the extension. There are discussion to make the customizable.
Moving to TS team.
mhegazy commentedon Sep 15, 2016
There has been multiple requests around this area. I have files a new issue to consolidate all the requests along with a proposal for a fix, see #10939. Let's use #10939 to track this change.
closing in favor of #10939.