copied set implementations from MultiFlag JS

node/src/builders/syntax.ts

@@ -0,0 +1,21 @@
+import type { BitFlagSet } from '../flagsets'
+
+export interface SelectFlagSetType {
+    useBitFlags(): DefineFlag<BitFlagSet>
+}
+
+export interface DefineFlag<T> {
+    define(name: string): SetValueOrCompose<T>
+
+    build(): T
+}
+
+export interface RequireParentsOrDefineFlag<T> extends DefineFlag<T> {
+    requires(...flags: string[]): DefineFlag<T>
+}
+
+export interface SetValueOrCompose<T> {
+    withValue(value: number): RequireParentsOrDefineFlag<T>
+
+    compose(...flags: string[]): DefineFlag<T>
+}