Review suggestions

- Convert `EvoCondKey` enum to `const` object

- Use early returns in `SpeciesEvolutionCondition#description`
and `SpeciesFormEvolution#description`

- Replace `!!x.find` with `x.some`
and `y.indexOf() > -1` with `y.includes()`

- Implement `coerceArray`

- Fix Shelmet evolution condition
checking for Shelmet and not Karrablast

- Remove unnecessary type casting in `battle-scene.ts`

src/battle-scene.ts

@@ -2966,7 +2966,7 @@ export default class BattleScene extends SceneBase {
       if (
         modifier instanceof PokemonHeldItemModifier &&
         !isNullOrUndefined(modifier.getSpecies()) &&
-        !this.getPokemonById((modifier as PokemonHeldItemModifier).pokemonId)?.hasSpecies(modifier.getSpecies()!)
+        !this.getPokemonById(modifier.pokemonId)?.hasSpecies(modifier.getSpecies()!)
       ) {
         modifiers.splice(m--, 1);
       }

src/data/balance/pokemon-evolutions.ts

@@ -3,7 +3,7 @@ import { Gender, getGenderSymbol } from "#app/data/gender";
 import { PokeballType } from "#enums/pokeball";
 import type Pokemon from "#app/field/pokemon";
 import { PokemonType } from "#enums/pokemon-type";
-import { isNullOrUndefined, randSeedInt } from "#app/utils/common";
+import { coerceArray, isNullOrUndefined, randSeedInt } from "#app/utils/common";
 import { WeatherType } from "#enums/weather-type";
 import { Nature } from "#enums/nature";
 import { BiomeId } from "#enums/biome-id";
@@ -84,38 +84,37 @@ type TyrogueMove = MoveId.LOW_SWEEP | MoveId.MACH_PUNCH | MoveId.RAPID_SPIN;
  */
 export type EvolutionLevel = [species: SpeciesId, level: number];
 
-enum EvoCondKey {
+const EvoCondKey = {
-  FRIENDSHIP = 1,
+  FRIENDSHIP: 1,
-  TIME,
+  TIME: 2,
-  MOVE,
+  MOVE: 3,
-  MOVE_TYPE,
+  MOVE_TYPE: 4,
-  PARTY_TYPE,
+  PARTY_TYPE: 5,
-  WEATHER,
+  WEATHER: 6,
-  BIOME,
+  BIOME: 7,
-  TYROGUE,
+  TYROGUE: 8,
-  SHEDINJA,
+  SHEDINJA: 9,
-  EVO_TREASURE_TRACKER,
+  EVO_TREASURE_TRACKER: 10,
-  RANDOM_FORM,
+  RANDOM_FORM: 11,
-  SPECIES_CAUGHT,
+  SPECIES_CAUGHT: 12,
-  GENDER,
+  GENDER: 13,
-  NATURE,
+  NATURE: 14,
-  HELD_ITEM, // Currently checks only for species stat booster items
+  HELD_ITEM: 15, // Currently checks only for species stat booster items
-}
+} as const;
 
 type EvolutionConditionData =
-  {key: EvoCondKey.FRIENDSHIP | EvoCondKey.RANDOM_FORM | EvoCondKey.EVO_TREASURE_TRACKER, value: number} |
+  {key: typeof EvoCondKey.FRIENDSHIP | typeof EvoCondKey.RANDOM_FORM | typeof EvoCondKey.EVO_TREASURE_TRACKER, value: number} |
-  {key: EvoCondKey.MOVE, move: MoveId} |
+  {key: typeof EvoCondKey.MOVE, move: MoveId} |
-  {key: EvoCondKey.TIME, time: TimeOfDay[]} |
+  {key: typeof EvoCondKey.TIME, time: TimeOfDay[]} |
-  {key: EvoCondKey.BIOME, biome: BiomeId[]} |
+  {key: typeof EvoCondKey.BIOME, biome: BiomeId[]} |
-  {key: EvoCondKey.GENDER, gender: Gender} |
+  {key: typeof EvoCondKey.GENDER, gender: Gender} |
-  {key: EvoCondKey.MOVE_TYPE | EvoCondKey.PARTY_TYPE, pkmnType: PokemonType} |
+  {key: typeof EvoCondKey.MOVE_TYPE | typeof EvoCondKey.PARTY_TYPE, pkmnType: PokemonType} |
-  {key: EvoCondKey.SPECIES_CAUGHT, speciesCaught: SpeciesId} |
+  {key: typeof EvoCondKey.SPECIES_CAUGHT, speciesCaught: SpeciesId} |
-  {key: EvoCondKey.HELD_ITEM, itemKey: SpeciesStatBoosterItem} |
+  {key: typeof EvoCondKey.HELD_ITEM, itemKey: SpeciesStatBoosterItem} |
-  {key: EvoCondKey.NATURE, nature: Nature[]} |
+  {key: typeof EvoCondKey.NATURE, nature: Nature[]} |
-  {key: EvoCondKey.WEATHER, weather: WeatherType[]} |
+  {key: typeof EvoCondKey.WEATHER, weather: WeatherType[]} |
-  {key: EvoCondKey.TYROGUE, move: TyrogueMove} |
+  {key: typeof EvoCondKey.TYROGUE, move: TyrogueMove} |
-  {key: EvoCondKey.SHEDINJA}
+  {key: typeof EvoCondKey.SHEDINJA};
-;
 
 export class SpeciesEvolutionCondition {
   public data: EvolutionConditionData[];
@@ -126,7 +125,9 @@ export class SpeciesEvolutionCondition {
   }
 
   public get description(): string[] {
-    if (isNullOrUndefined(this.desc)) {
+    if (!isNullOrUndefined(this.desc)) {
+      return this.desc;
+    }
     this.desc = this.data.map(cond => {
       switch(cond.key) {
         case EvoCondKey.FRIENDSHIP:
@@ -158,7 +159,6 @@ export class SpeciesEvolutionCondition {
           return i18next.t(`pokemonEvolutions:heldItem.${cond.itemKey}`);
       }
     }).filter(s => !isNullOrUndefined(s)); // Filter out stringless conditions
-    }
     return this.desc;
   }
 
@@ -175,7 +175,7 @@ export class SpeciesEvolutionCondition {
         case EvoCondKey.MOVE_TYPE:
           return pokemon.moveset.some(m => m.getMove().type === cond.pkmnType);
         case EvoCondKey.PARTY_TYPE:
-          return !!globalScene.getPlayerParty().find(p => p.getTypes(false, false, true).indexOf(cond.pkmnType) > -1)
+          return globalScene.getPlayerParty().some(p => p.getTypes(false, false, true).includes(cond.pkmnType))
         case EvoCondKey.EVO_TREASURE_TRACKER:
           return pokemon.getHeldItems().some(m =>
             m.is("EvoTrackerModifier") &&
@@ -190,9 +190,7 @@ export class SpeciesEvolutionCondition {
         case EvoCondKey.WEATHER:
           return cond.weather.includes(globalScene.arena.getWeatherType());
         case EvoCondKey.TYROGUE:
-          return pokemon.getMoveset(true).find(m =>
+          return pokemon.getMoveset(true).find(m => m.moveId as TyrogueMove)?.moveId === cond.move;
-            m && m.moveId as TyrogueMove
-          )?.moveId === cond.move;
         case EvoCondKey.NATURE:
           return cond.nature.includes(pokemon.getNature());
         case EvoCondKey.RANDOM_FORM: {
@@ -230,18 +228,16 @@ export class SpeciesFormEvolution {
     this.level = level;
     this.item = item || EvolutionItem.NONE;
     if (!isNullOrUndefined(condition)) {
-      if (Array.isArray(condition)) { // Waiting on coerceArray...
+      this.condition = new SpeciesEvolutionCondition(...coerceArray(condition));
-        this.condition = new SpeciesEvolutionCondition(...condition);
-      }
-      else {
-        this.condition = new SpeciesEvolutionCondition(condition);
-      }
     }
     this.wildDelay = wildDelay ?? SpeciesWildEvolutionDelay.NONE;
   }
 
   get description(): string {
-    if (this.desc.length === 0) {
+    if (this.desc.length > 0) {
+      return this.desc;
+    }
+
     const strings: string[] = [];
     let len = 0;
     if (this.level > 1) {
@@ -274,7 +270,7 @@ export class SpeciesFormEvolution {
       })
       .join(" ")
       .replace(" \n", i18next.t("pokemonEvolutions:connector") + "\n");
-    }
+
     return this.desc;
   }
 
@@ -290,7 +286,7 @@ export class SpeciesFormEvolution {
       pokemon.level >= this.level &&
       // Check form key, using the fusion's form key if we're checking the fusion
       (isNullOrUndefined(this.preFormKey) || (forFusion ? pokemon.getFusionFormKey() : pokemon.getFormKey()) === this.preFormKey) &&
-      (isNullOrUndefined(this.condition) || this.condition?.conditionsFulfilled(pokemon)) &&
+      (isNullOrUndefined(this.condition) || this.condition.conditionsFulfilled(pokemon)) &&
       ((item ?? EvolutionItem.NONE) === (this.item ?? EvolutionItem.NONE))
     );
   }
@@ -302,7 +298,7 @@ export class SpeciesFormEvolution {
       pokemon.level >= this.level &&
       // Check form key, using the fusion's form key if we're checking the fusion
       (isNullOrUndefined(this.preFormKey) || (forFusion ? pokemon.getFormKey() : pokemon.getFusionFormKey()) === this.preFormKey) &&
-      (this.condition === null || this.condition?.conditionsFulfilled(pokemon))
+      (isNullOrUndefined(this.condition) || this.condition.conditionsFulfilled(pokemon))
     );
   }
 
@@ -1777,7 +1773,7 @@ export const pokemonEvolutions: PokemonEvolutions = {
     new SpeciesEvolution(SpeciesId.ESCAVALIER, 1, EvolutionItem.LINKING_CORD, {key: EvoCondKey.SPECIES_CAUGHT, speciesCaught: SpeciesId.SHELMET}, SpeciesWildEvolutionDelay.VERY_LONG)
   ],
   [SpeciesId.SHELMET]: [
-    new SpeciesEvolution(SpeciesId.ACCELGOR, 1, EvolutionItem.LINKING_CORD, {key: EvoCondKey.SPECIES_CAUGHT, speciesCaught: SpeciesId.SHELMET}, SpeciesWildEvolutionDelay.VERY_LONG)
+    new SpeciesEvolution(SpeciesId.ACCELGOR, 1, EvolutionItem.LINKING_CORD, {key: EvoCondKey.SPECIES_CAUGHT, speciesCaught: SpeciesId.KARRABLAST}, SpeciesWildEvolutionDelay.VERY_LONG)
   ],
   [SpeciesId.SPRITZEE]: [
     new SpeciesEvolution(SpeciesId.AROMATISSE, 1, EvolutionItem.SACHET, null, SpeciesWildEvolutionDelay.VERY_LONG)