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"Feature can only be used in a .ts file." when switching the language mode to TypeScript in a .js file #9199
Description
- 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: microsoft/TypeScript#7926
Activity
[-]"can only be used in a .ts file."[/-][+]"Feature can only be used in a .ts file." when switching the language mode to TypeScript in a .js file[/+]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.
dbaeumer commentedon Jul 13, 2016
This issue was moved to microsoft/TypeScript#9670