revert(BitField): ⏪ Bring back-compatibility after BitField serializa…

…tion (#5910)

src/util/BitField.js

@@ -129,9 +129,10 @@ class BitField {
   /**
    * Data that can be resolved to give a bitfield. This can be:
    * * A bit number (this can be a number literal or a value taken from {@link BitField.FLAGS})
+   * * A string bit number
    * * An instance of BitField
    * * An Array of BitFieldResolvable
-   * @typedef {number|bigint|BitField|BitFieldResolvable[]} BitFieldResolvable
+   * @typedef {number|string|bigint|BitField|BitFieldResolvable[]} BitFieldResolvable
    */
 
   /**
@@ -144,7 +145,10 @@ class BitField {
     if (typeof defaultBit === typeof bit && bit >= defaultBit) return bit;
     if (bit instanceof BitField) return bit.bitfield;
     if (Array.isArray(bit)) return bit.map(p => this.resolve(p)).reduce((prev, p) => prev | p, defaultBit);
-    if (typeof bit === 'string' && typeof this.FLAGS[bit] !== 'undefined') return this.FLAGS[bit];
+    if (typeof bit === 'string') {
+      if (typeof this.FLAGS[bit] !== 'undefined') return this.FLAGS[bit];
+      if (!isNaN(bit)) return typeof defaultBit === 'bigint' ? BigInt(bit) : Number(bit);
+    }
     throw new RangeError('BITFIELD_INVALID', bit);
   }
 }

typings/index.d.ts

@@ -365,7 +365,7 @@ declare module 'discord.js' {
     public valueOf(): N;
     public [Symbol.iterator](): IterableIterator<S>;
     public static FLAGS: unknown;
-    public static resolve(bit?: BitFieldResolvable<any, number | bigint>): number | bigint;
+    public static resolve(bit?: BitFieldResolvable<S, N>): number | bigint;
   }
 
   export class ButtonInteraction extends MessageComponentInteraction {
@@ -2874,9 +2874,10 @@ declare module 'discord.js' {
   }
 
   type BitFieldResolvable<T extends string, N extends number | bigint> =
-    | RecursiveReadonlyArray<T | N | Readonly<BitField<T, N>>>
+    | RecursiveReadonlyArray<T | N | `${bigint}` | Readonly<BitField<T, N>>>
     | T
     | N
+    | `${bigint}`
     | Readonly<BitField<T, N>>;
 
   type BufferResolvable = Buffer | string;