isCompilerOptionEnabled: handle emitDeclarationOnly

Author: ajafff

util/util.ts

@@ -1475,6 +1475,7 @@ export function isCompilerOptionEnabled(options: ts.CompilerOptions, option: Boo
     switch (option) {
         case 'stripInternal':
         case 'declarationMap':
+        case 'emitDeclarationOnly':
             return options[option] === true && isCompilerOptionEnabled(options, 'declaration');
         case 'declaration':
             return options.declaration || isCompilerOptionEnabled(options, 'composite');