TypeScript: fixes .toJSON() return type.

Author: endel

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@colyseus/schema",
-  "version": "2.0.16",
+  "version": "2.0.17",
   "description": "Binary state serializer with delta encoding for games",
   "bin": {
     "schema-codegen": "./bin/schema-codegen"
@@ -78,7 +78,7 @@
     "source-map-support": "^0.5.13",
     "ts-node": "^7.0.1",
     "tslib": "^2.1.0",
-    "tsx": "^3.12.7",
+    "tsx": "^3.13.0",
     "typescript": "^5.0.4"
   },
   "nyc": {

src/Schema.ts

@@ -898,15 +898,15 @@ export abstract class Schema {
         const schema = this._definition.schema;
         const deprecated = this._definition.deprecated;
 
-        const obj: ToJSON<typeof this> = {};
+        const obj: unknown = {};
         for (let field in schema) {
             if (!deprecated[field] && this[field] !== null && typeof (this[field]) !== "undefined") {
                 obj[field] = (typeof (this[field]['toJSON']) === "function")
                     ? this[field]['toJSON']()
                     : this[`_${field}`];
             }
         }
-        return obj;
+        return obj as ToJSON<typeof this>;
     }
 
     discardAllChanges() {

src/types/HelperTypes.ts

@@ -9,10 +9,10 @@ export type NonFunctionPropNames<T> = {
     [K in keyof T]: T[K] extends Function ? never : K
 }[keyof T];
 
-export type ToJSON<T> = Partial<NonFunctionProps<{
+export type ToJSON<T> = NonFunctionProps<{
     [K in keyof T]: T[K] extends MapSchema<infer U>
         ? Record<string, U>
         : T[K] extends ArraySchema<infer U>
             ? U[]
             : T[K]
-}>>;
+}>;