copied set implementations from MultiFlag JS

node/src/flagsets/bigint.ts

@@ -0,0 +1,54 @@
+import type { FlagSet } from '.'
+import { UnavailableFeatureError } from '../errors'
+import { ENV_BI } from '../env'
+import {
+    BigBitFlagsIterator,
+    EnumerateFlags,
+    useIterator,
+} from '../enumeration'
+
+export class BigBitFlagSet implements FlagSet<bigint, bigint> {
+    /**
+     * Creates a new empty flag set.
+     *
+     * @throws UnavailableFeatureError When this constructor is called in an
+     *         environment that does not natively support {@link BigInt}s.
+     */
+    public constructor() {
+        if (!ENV_BI.AVAILABLE) {
+            throw new UnavailableFeatureError('BigInts')
+        }
+    }
+
+    minimum(flags: bigint): bigint {
+        throw new Error('Method not implemented.')
+    }
+
+    maximum(flags: bigint): bigint {
+        throw new Error('Method not implemented.')
+    }
+
+    public none(): bigint {
+        return ENV_BI.ZERO
+    }
+
+    public union(first: bigint, second: bigint): bigint {
+        return first | second
+    }
+
+    public intersection(first: bigint, second: bigint): bigint {
+        return first & second
+    }
+
+    public difference(first: bigint, second: bigint): bigint {
+        return first & ~second
+    }
+
+    public isSuperset(first: bigint, second: bigint): boolean {
+        return (first & second) == second
+    }
+
+    public enumerate(flags: bigint): EnumerateFlags<bigint> {
+        return useIterator(flags, BigBitFlagsIterator)
+    }
+}