Add enumValueToKey utility function

src/phases/move-phase.ts

@@ -29,7 +29,7 @@ import { MoveResult } from "#enums/move-result";
 import { getPokemonNameWithAffix } from "#app/messages";
 import Overrides from "#app/overrides";
 import { BattlePhase } from "#app/phases/battle-phase";
-import { NumberHolder } from "#app/utils/common";
+import { enumValueToKey, NumberHolder } from "#app/utils/common";
 import { AbilityId } from "#enums/ability-id";
 import { ArenaTagType } from "#enums/arena-tag-type";
 import { BattlerTagType } from "#enums/battler-tag-type";
@@ -129,7 +129,7 @@ export class MovePhase extends BattlePhase {
   public start(): void {
     super.start();
 
-    console.log(MoveId[this.move.moveId], MoveUseMode[this.useMode]);
+    console.log(MoveId[this.move.moveId], enumValueToKey(MoveUseMode, this.useMode));
 
     // Check if move is unusable (e.g. running out of PP due to a mid-turn Spite
     // or the user no longer being on field), ending the phase early if not.

src/utils/common.ts

@@ -611,3 +611,25 @@ export function getShinyDescriptor(variant: Variant): string {
       return i18next.t("common:commonShiny");
   }
 }
+
+/**
+ * Returns the name of the key that matches the enum [object] value.
+ * @param input - The enum [object] to check
+ * @param val - The value to get the key of
+ * @returns The name of the key with the specified value
+ * @example
+ * const thing = {
+ *   one: 1,
+ *   two: 2,
+ * } as const;
+ * console.log(enumValueToKey(thing, thing.two)); // output: "two"
+ * @throws An `Error` if an invalid enum value is passed to the function
+ */
+export function enumValueToKey<T extends Record<string, string | number>>(input: T, val: T[keyof T]): keyof T {
+  for (const [key, value] of Object.entries(input)) {
+    if (val === value) {
+      return key as keyof T;
+    }
+  }
+  throw new Error(`Invalid value passed to \`enumValueToKey\`! Value: ${val}`);
+}