error TS6504: File 'tests/cases/compiler/a.js' is a JavaScript file. Did you mean to enable the 'allowJs' option?


!!! error TS6504: File 'tests/cases/compiler/a.js' is a JavaScript file. Did you mean to enable the 'allowJs' option?
==== tests/cases/compiler/a.js (0 errors) ====
    declare var v;