FEAT: add TypedPseudoDocument

REFACTOR: PreudoDocument
FIX: Typos Bug

module/data/pseudo-documents/base/pseudoDocument.mjs

@@ -0,0 +1,48 @@
+import BasePseudoDocument from './base.mjs';
+import SheetManagementMixin from './sheetManagementMixin.mjs';
+
+/** @extends BasePseudoDocument */
+export default class PseudoDocument extends SheetManagementMixin(BasePseudoDocument) {
+    static get TYPES() {
+        return (this._TYPES ??= Object.freeze(CONFIG.daggerheart.pseudoDocuments[this.metadata.name]));
+    }
+
+    static _TYPES;
+
+    /* -------------------------------------------- */
+
+    /**
+     * The type of this shape.
+     * @type {string}
+     */
+    static TYPE = '';
+
+    /* -------------------------------------------- */
+
+    /** @override */
+    static defineSchema() {
+        const { fields } = foundry.data;
+
+        return Object.assign(super.defineSchema(), {
+            type: new fields.StringField({
+                required: true,
+                blank: false,
+                initial: this.TYPE,
+                validate: value => value === this.TYPE,
+                validationError: `must be equal to "${this.TYPE}"`
+            })
+        });
+    }
+
+    /** @inheritdoc */
+    static async create(data = {}, { parent, ...operation } = {}) {
+        data = foundry.utils.deepClone(data);
+        if (!data.type) data.type = Object.keys(this.TYPES)[0];
+        if (!(data.type in this.TYPES)) {
+            throw new Error(
+                `The '${data.type}' type is not a valid type for a '${this.metadata.documentName}' pseudo-document!`
+            );
+        }
+        return super.create(data, { parent, ...operation });
+    }
+}