Begin working on making there be per-subtype classes for class methods

module/documents/Actor/Handler.mjs

@@ -0,0 +1,22 @@
+import { PlayerActor } from "./Player.mjs";
+
+export class ActorHandler extends Actor {
+	actorTypes = {
+		player: PlayerActor,
+	};
+
+	constructor(data, ctx) {
+		super(data, ctx);
+	};
+
+	/** @type {class|undefined} */
+	get fn() {
+		return this.actorTypes[this.type];
+	};
+
+	createCustomSpell() {
+		if (!this.fn?.createCustomSpell) return;
+		this.fn.createCustomSpell.bind(this)();
+		this.sheet.render(true);
+	};
+};

module/documents/Actor/Player.mjs

@@ -0,0 +1,10 @@
+export class PlayerActor {
+	static createCustomSpell() {
+		let customUUID = `Spell.Custom.${randomID()}`;
+		this.system.spells[customUUID] = {
+			name: ``,
+			cost: ``,
+			description: ``,
+		};
+	};
+};

module/models/PlayerData.mjs

@@ -135,11 +135,11 @@ export class PlayerData extends foundry.abstract.DataModel {
 				upkeep: new fields.NumberField({ min: 0, integer: true }),
 				info: new fields.StringField(),
 			}),
-			spells: new fields.ArrayField(
+			spells: new MappingField(
 				new fields.SchemaField({
-					name: new fields.StringField(),
-					cost: new fields.NumberField(),
-					info: new fields.StringField(),
+					name: new fields.StringField({ initial: ``, blank: true, trim: true }),
+					cost: new fields.NumberField({ initial: 0, min: 0 }),
+					info: new fields.StringField({ initial: ``, blank: true, trim: true }),
 				})
 			),
 			respawns: new fields.SchemaField({

module/sheets/PlayerSheet.mjs

@@ -19,17 +19,7 @@ export class PlayerSheet extends GenericActorSheet {
 		if (!this.isEditable) return;
 		console.debug(`.dungeon | Adding event listeners for Actor: ${this.id}`);
 
-		/*
-		Toggles the expanded state for the detail elements in the sheet.
-		*/
-	};
-
-	#syncValue() {
-		let delta = 0;
-		for (const actor of game.actors) {
-			delta += actor.system.syncDelta ?? 0;
-		};
-		return 100 + delta;
+		html.find(`.add-spell`).on(`click`, this.actor.createCustomSpell.bind(this.actor));
 	};
 
 	getData() {
@@ -40,7 +30,6 @@ export class PlayerSheet extends GenericActorSheet {
 		ctx.flags = actor.flags;
 
 		ctx.computed = {
-			syncTotal: this.#syncValue(),
 			canChangeGroup: ctx.settings.playersCanChangeGroup || ctx.isGM,
 		};
 
@@ -50,6 +39,4 @@ export class PlayerSheet extends GenericActorSheet {
 		console.groupEnd();
 		return ctx;
 	};
-
-
 };