Function isTypeSubsetOf

test/fixtures/snapshot/typescript.js:69857–69859

(source, target)

            return source.flags & 1048576 /* TypeFlags.Union */ ? !ts.forEach(source.types, function (t) { return !ts.contains(types, t); }) : ts.contains(types, source);
        }
        function isTypeSubsetOf(source, target) {
            return source === target || target.flags & 1048576 /* TypeFlags.Union */ && isTypeSubsetOfUnion(source, target);
        }
        function isTypeSubsetOfUnion(source, target) {
            if (source.flags & 1048576 /* TypeFlags.Union */) {
                for (var _i = 0, _a = source.types; _i < _a.length; _i++) {