Function isTypeSubsetOfUnion

test/fixtures/snapshot/typescript.js:69860–69874

(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++) {
                    var t = _a[_i];
                    if (!containsType(target.types, t)) {
                        return false;
                    }
                }
                return true;
            }
            if (source.flags & 1024 /* TypeFlags.EnumLiteral */ && getBaseTypeOfEnumLiteralType(source) === target) {
                return true;
            }
            return containsType(target.types, source);
        }
        function forEachType(type, f) {
            return type.flags & 1048576 /* TypeFlags.Union */ ? ts.forEach(type.types, f) : f(type);
        }