Support js/jsx/cjs/mjs extensions

[mjewell]

If your tsconfig has allowJs / checkJs true then we should be able to run tsc-files against js/jsx/cjs/mjs files too. This line filters only for ts/tsx so if you run something like tsc-files a.ts b.js then you get an error error TS5042: Option 'project' cannot be mixed with source files on a command line.. because it puts a.ts into the temporary tsconfig but forwards b.js as a command line arg.

[gustavopch]

@mjewell Thanks for the details. If I understand correctly, adding the missing extensions should be enough to fix this issue, right?

[mjewell]

Yep, as far as I know