tests/cases/compiler/isolatedModulesPlainFile-UMD.ts(1,1): error TS1208: 'isolatedModulesPlainFile-UMD.ts' cannot be compiled under '--isolatedModules' because it is considered a global script file. Add an import, export, or an empty 'export {}' statement to make it a module.


==== tests/cases/compiler/isolatedModulesPlainFile-UMD.ts (1 errors) ====
    declare function run(a: number): void;
    ~~~~~~~
!!! error TS1208: 'isolatedModulesPlainFile-UMD.ts' cannot be compiled under '--isolatedModules' because it is considered a global script file. Add an import, export, or an empty 'export {}' statement to make it a module.
    run(1);
    