improve: UserValue API

build.gradle

@@ -31,7 +31,7 @@ task compileEnv(type: NpmTask) {
 }
 task compileTypescript(type: NpmTask) {
 	inputs.files('rollup.config.js');
-	inputs.dir('src/lib/ts');
+	inputs.dir('src/lib/transpiler');
 	outputs.files("build/js/ts.js");
 	// nom nom tasty ram
 	environment.put("NODE_OPTIONS", "--max-old-space-size=4096");

package.json

@@ -1,10 +1,17 @@
 {
 	"scripts": {
 		"build-env": "rollup -c --environment INPUT:src/lib/libs/_entry.ts,OUTPUT:build/js/index.js,POLYFILLS:src/lib/libs/polyfills",
-		"build-ts": "rollup -c --environment INPUT:src/lib/ts/_entry.ts,OUTPUT:build/js/ts.js"
+		"build-ts": "rollup -c --environment INPUT:src/lib/transpiler/_entry.ts,OUTPUT:build/js/ts.js"
 	},
 	"dependencies": {
+		"@babel/core": "^7.26.0",
 		"@babel/runtime": "^7.26.0",
+		"@babel/standalone": "^7.26.4",
+		"@rollup/plugin-json": "^6.1.0",
+		"@types/babel__preset-env": "^7.9.7",
+		"@types/babel__standalone": "^7.1.9",
+		"@types/coffeescript": "^2.5.7",
+		"coffeescript": "^2.7.0",
 		"typescript": "^5.7.2"
 	},
 	"devDependencies": {

rollup.config.js

@@ -4,6 +4,7 @@ const typescript = require("@rollup/plugin-typescript");
 const babel = require("@rollup/plugin-babel");
 const commonjs = require("@rollup/plugin-commonjs");
 const nodeResolve = require("@rollup/plugin-node-resolve");
+const json = require("@rollup/plugin-json");
 const { resolve } = require("path");
 
 const shouldMinify = () => false;
@@ -21,6 +22,7 @@ const construct = (input, output) => defineConfig({
 		},
 		commonjs(),
 		nodeResolve(),
+		json(),
 		babel({
 			extensions: [],
 			exclude: ["node_modules/**"],
@@ -107,6 +109,14 @@ const construct = (input, output) => defineConfig({
 			path: "null",
 			os: "null",
 			inspector: "null",
+			tty: "null",
+			util: "null",
+			assert: "null",
+			url: "null",
+			"@babel/preset-typescript/package.json": "null",
+			module: "null",
+			process: "null",
+			v8: "null",
 		},
 		// plugins: [babel.getBabelOutputPlugin({
 		// 	allowAllFormats: true,

src/lib/libs/_entry.ts

@@ -13,6 +13,7 @@ import { Date } from "./date.ts";
 import { Math as _Math } from "./math.ts";
 import { Set, WeakSet } from "./set.ts";
 import { JSON } from "./json.ts";
+import { console } from "./console.ts";
 import { encodeURI, encodeURIComponent } from "./url.ts";
 import { Promise } from "./promise.ts";
 
@@ -27,6 +28,8 @@ function fixup<T extends Function>(clazz: T) {
 	return clazz;
 }
 
+object.setPrototype(target, Object.prototype);
+
 object.defineField(target, "undefined", { e: false, c: false, w: false, v: void 0 });
 
 target.Symbol = fixup(Symbol);
@@ -52,6 +55,8 @@ target.Date = fixup(Date);
 target.Promise = fixup(Promise);
 target.Math = object.setPrototype(_Math, Object.prototype);
 target.JSON = object.setPrototype(JSON, Object.prototype);
+target.console = object.setPrototype(console, Object.prototype);
+target.TYPED_ARRAY_SUPPORT = false;
 
 target.parseInt = Number.parseInt;
 target.parseFloat = Number.parseFloat;

src/lib/libs/array.ts

@@ -157,6 +157,16 @@ export const Array = (() => {
 
 			return res;
 		}
+		public reduce(this: any[], cb: Function, initial: any) {
+			let i = 0;
+			if (arguments.length <= 1) initial = this[i++];
+
+			for (; i < this.length; i++) {
+				initial = cb(initial, this[i], i, this);
+			}
+
+			return initial;
+		}
 		public some(this: any[], cb: Function, self?: any) {
 			for (let i = 0; i < this.length; i++) {
 				if (i in this && func.invoke(cb, self, [this[i], i, this])) return true;
@@ -197,6 +207,13 @@ export const Array = (() => {
 
 			return -1;
 		}
+		public includes(this: any[], val: any) {
+			for (let i = 0; i < this.length; i++) {
+				if (i in this && this[i] === val) return i;
+			}
+
+			return false;
+		}
 
 		public sort(this: any[], cb?: Function) {
 			cb ||= (a: any, b: any) => {
@@ -207,6 +224,18 @@ export const Array = (() => {
 
 			return object.sort(this, cb);
 		}
+		public reverse(this: any[]) {
+			const mid = this.length >> 1;
+			const end = this.length - 1;
+
+			for (let i = 0; i < mid; i++) {
+				const tmp = this[i];
+				this[i] = this[end - i];
+				this[end - i] = tmp;
+			}
+
+			return this;
+		}
 	
 		public [symbols.iterator](this: any[]) {
 			let i = 0;

src/lib/libs/console.ts

@@ -0,0 +1,11 @@
+import { func, json, object } from "./primordials";
+
+export const console = {};
+
+function method(name: string, func: Function) {
+	object.defineField(console, name, { c: true, e: false, w: true, v: func });
+}
+
+method("log", function log() {
+	func.invoke(print, null, arguments as any);
+});

src/lib/libs/math.ts

@@ -55,3 +55,6 @@ method("ceil", function floor(val: number) {
 method("pow", function pow(a: number, b: number) {
 	return number.pow(a, b);
 });
+method("log", function log(val: number) {
+	return number.log(val);
+});

src/lib/libs/object.ts

@@ -13,9 +13,10 @@ export const Object = (() => {
 			else if (this === null) return "[object Null]";
 			else if (typeof this === "object") {
 				if (symbols.toStringTag in this) return "[object " + (this as any)[symbols.toStringTag] + "]";
+				else if (object.isArray(this)) return "[object Array]";
 				else return "[object Object]";
 			}
-			else if (typeof this === "number" || this instanceof Object) return "[object Object]";
+			else if (typeof this === "number" || this instanceof Number) return "[object Number]";
 			else if (typeof this === "symbol" || this instanceof Symbol) return "[object Symbol]";
 			else if (typeof this === "string" || this instanceof String) return "[object String]";
 			else if (typeof this === "boolean" || this instanceof Boolean) return "[object Boolean]";
@@ -46,6 +47,12 @@ export const Object = (() => {
 		public static getOwnPropertyDescriptor(obj: object, key: any) {
 			return object.getOwnMember(obj, key);
 		}
+		public static getOwnPropertyNames(obj: object): string[] {
+			return object.getOwnMembers(obj, false);
+		}
+		public static getOwnPropertySymbols(obj: object): symbol[] {
+			return object.getOwnSymbolMembers(obj, false);
+		}
 
 		public static defineProperty(obj: object, key: string | symbol, desc: PropertyDescriptor) {
 			if (obj === null || typeof obj !== "function" && typeof obj !== "object") {
@@ -84,8 +91,8 @@ export const Object = (() => {
 			return obj;
 		}
 		public static defineProperties(obj: object, desc: PropertyDescriptorMap) {
-			const keys = object.getOwnMembers(desc, false) as ((keyof typeof obj) & string)[];
-			const symbols = object.getOwnSymbolMembers(desc, false) as ((keyof typeof obj) & symbol)[];
+			const keys = object.getOwnMembers(desc, true) as ((keyof typeof obj) & string)[];
+			const symbols = object.getOwnSymbolMembers(desc, true) as ((keyof typeof obj) & symbol)[];
 
 			for (let i = 0; i < keys.length; i++) {
 				Object.defineProperty(obj, keys[i], desc[keys[i]]);
@@ -119,7 +126,6 @@ export const Object = (() => {
 			return target;
 		}
 
-
 		public static setPrototypeOf(obj: object, proto: object | null) {
 			object.setPrototype(obj, proto!);
 		}
@@ -129,8 +135,8 @@ export const Object = (() => {
 
 		public static keys(obj: any) {
 			const res: any[] = [];
-			const keys = object.getOwnMembers(obj, false);
-			const symbols = object.getOwnSymbolMembers(obj, false);
+			const keys = object.getOwnMembers(obj, true);
+			const symbols = object.getOwnSymbolMembers(obj, true);
 
 			for (let i = 0; i < keys.length; i++) {
 				res[res.length] = keys[i];
@@ -143,8 +149,8 @@ export const Object = (() => {
 		}
 		public static values(obj: any) {
 			const res: any[] = [];
-			const keys = object.getOwnMembers(obj, false);
-			const symbols = object.getOwnSymbolMembers(obj, false);
+			const keys = object.getOwnMembers(obj, true);
+			const symbols = object.getOwnSymbolMembers(obj, true);
 
 			for (let i = 0; i < keys.length; i++) {
 				res[res.length] = obj[keys[i]];
@@ -157,8 +163,8 @@ export const Object = (() => {
 		}
 		public static entries(obj: any) {
 			const res: [any, any][] = [];
-			const keys = object.getOwnMembers(obj, false);
-			const symbols = object.getOwnSymbolMembers(obj, false);
+			const keys = object.getOwnMembers(obj, true);
+			const symbols = object.getOwnSymbolMembers(obj, true);
 
 			for (let i = 0; i < keys.length; i++) {
 				res[res.length] = [keys[i], obj[keys[i]]];
@@ -172,12 +178,15 @@ export const Object = (() => {
 
 		public static preventExtensions(obj: object) {
 			object.preventExt(obj);
+			return obj;
 		}
 		public static seal(obj: object) {
 			object.seal(obj);
+			return obj;
 		}
 		public static freeze(obj: object) {
 			object.freeze(obj);
+			return obj;
 		}
 	}
 

src/lib/libs/polyfills/createClass.js

@@ -5,19 +5,28 @@ function _defineProperties(target, arr) {
 	for (var i = 0; i < arr.length; i++) {
 		var desc = arr[i];
 		var res;
+		var w, e, c;
+
+		c = desc.configurable;
+		if (c == null) c = true;
+		e = desc.enumerable;
+		if (e == null) e = false;
 
 		if ("value" in desc) {
-			res = object.defineField(target, desc.key, { w: desc.writable || true, e: desc.enumerable || true, c: desc.configurable || true, v: desc.value });
+			w = desc.writable;
+			if (w == null) w = true;
+
+			if (desc.writable == null) 
+			res = object.defineField(target, desc.key, { w: !!w, e: !!e, c: !!c, v: desc.value });
 		}
 		else {
-			res = object.defineProperty(target, desc.key, { e: desc.enumerable || true, c: desc.configurable || true, g: desc.get, s: desc.set });
+			res = object.defineProperty(target, desc.key, { e: !!e, c: !!c, g: desc.get, s: desc.set });
 		}
 
 		if (!res) throw "Couldn't set property";
 	}
 }
 
-/* __#PURE__ */
 export default function _createClass(clazz, instance, nonInstance) {
 	_defineProperties(clazz.prototype, instance);
 	_defineProperties(clazz, nonInstance);

src/lib/libs/primordials.ts

@@ -5,13 +5,17 @@ export interface SymbolPrimordials {
 	getSymbolDescription(symbol: symbol): string;
 }
 export interface NumberPrimordials {
+	NaN: number;
+	Infinity: number;
+	PI: number;
+	E: number;
+
 	parseInt(raw: string | number, radix?: number): number;
 	parseFloat(raw: string | number): number;
 	isNaN(num: number): boolean;
-	NaN: number;
-	Infinity: number;
 
 	pow(a: number, b: number): number;
+	log(val: number): number;
 }
 export interface StringPrimordials {
 	stringBuild(parts: string[]): string;
@@ -32,12 +36,13 @@ export interface ObjectPrimordials {
 	getOwnSymbolMembers(obj: object, onlyEnumerable: boolean): symbol[];
 	getPrototype(obj: object): object | undefined;
 	setPrototype(obj: object, proto?: object): object;
-	isArray(obj: any[]): boolean;
-
 	preventExt(obj: object): void;
 	seal(obj: object): void;
 	freeze(obj: object): void;
 
+	isArray(obj: any): obj is any[];
+	subarray(arr: any[], start: number, end: number): any[];
+
 	memcpy(src: any[], dst: any[], srcI: number, dstI: number, n: number): void;
 	sort(arr: any[], cb: Function): any[];
 }

src/lib/libs/string.ts

@@ -72,6 +72,13 @@ export const String = (() => {
 			return string.substring(self, 0, endI);
 		}
 
+		public trimLeft() {
+			return func.invoke(String.prototype.trimStart, this, []);
+		}
+		public trimRight() {
+			return func.invoke(String.prototype.trimEnd, this, []);
+		}
+
 		public charAt(i: number) {
 			const self = unwrapThis(this, "string", String, "String.prototype.charAt");
 			return self[i];
@@ -133,6 +140,16 @@ export const String = (() => {
 
 			return applyReplaces(self, matches, replacer, false);
 		}
+		public repeat(n: number) {
+			const self = unwrapThis(this, "string", String, "String.prototype.replaceAll");
+			const res: string[] = [];
+
+			for (let i = 0; i < n; i++) {
+				res[i] = self;
+			}
+
+			return string.stringBuild(res);
+		}
 
 		public slice(start = 0, end?: number) {
 			const self = unwrapThis(this, "string", String, "String.prototype.slice");
@@ -143,32 +160,63 @@ export const String = (() => {
 			if (end <= start) return "";
 			return string.substring(self, start, end);
 		}
-		public substring(this: string, start = 0, end = this.length) {
+		public substring(start = 0, end?: number) {
 			const self = unwrapThis(this, "string", String, "String.prototype.substring");
-			start = limitI(start, this.length);
-			end = limitI(end, this.length);
+			if (end === undefined) end = self.length;
+			start = limitI(start, self.length);
+			end = limitI(end, self.length);
 
 			if (end <= start) return "";
 			return string.substring(self, start, end);
 		}
-		public substr(this: string, start = 0, count = this.length - start) {
+		public substr(start = 0, count?: number) {
 			const self = unwrapThis(this, "string", String, "String.prototype.substr");
-			start = limitI(start, this.length);
-			count = limitI(count, this.length - start);
+			count = self.length - start;
+			start = limitI(start, self.length);
+			count = limitI(count, self.length - start);
 
 			if (count <= 0) return "";
 			return string.substring(self, start, count + start);
 		}
+		public concat() {
+			const self = unwrapThis(this, "string", String, "String.prototype.concat");
+			const parts = [self];
+			for (let i = 0; i < arguments.length; i++) {
+				parts[i + 1] = (String as any)(arguments[i]);
+			}
 
-		public toLowerCase(this: string) {
+			return string.stringBuild(parts);
+		}
+
+		public toLowerCase() {
 			const self = unwrapThis(this, "string", String, "String.prototype.toLowerCase");
 			return string.lower(self);
 		}
-		public toUpperCase(this: string) {
+		public toUpperCase() {
 			const self = unwrapThis(this, "string", String, "String.prototype.toLowerCase");
 			return string.upper(self);
 		}
 
+		public match(regex: RegExp) {
+			const self = unwrapThis(this, "string", String, "String.prototype.match");
+			if (!(regex instanceof RegExp)) throw new TypeError("Regexp expected for String.prototype.match");
+
+			if (regex.global) {
+				let matches: string[] | null = null;
+
+				while (true) {
+					const match = regex.exec(self);
+					if (match == null) break;
+
+					matches ||= [];
+					matches[matches.length] = match[0];
+				}
+
+				return matches;
+			}
+			else return regex.exec(self);
+		}
+
 		public [symbols.iterator]() {
 			var i = 0;
 			var arr: string | undefined = unwrapThis(this, "string", String, "String.prototype[Symbol.iterator]");

src/lib/transpiler/_entry.ts

@@ -0,0 +1,4 @@
+import coffeescript from "./coffeescript.ts";
+import babel from "./babel.ts";
+
+register(v => coffeescript(babel(v)));

src/lib/transpiler/babel.ts

@@ -0,0 +1,25 @@
+import { SourceMap } from "./map.ts";
+import { transform } from "@babel/standalone";
+// import presetEnv from "@babel/preset-env";
+
+export default function babel(next: Compiler): Compiler {
+	print("Loaded babel!");
+	
+	return (filename, code, prevMap) => {
+		const res = transform(code, {
+			filename,
+			sourceMaps: true,
+		});
+
+		const map = SourceMap.parse({
+			file: "babel-internal://" + filename,
+			mappings: res.map!.mappings,
+			sources: [filename],
+		});
+
+		const compiled = next("babel-internal://" + filename, res.code!, SourceMap.chain(map, prevMap));
+		registerSource(filename, code);
+		return compiled;
+	};
+}
+

src/lib/transpiler/coffeescript.ts

@@ -0,0 +1,28 @@
+import { compile } from "coffeescript";
+import { SourceMap } from "./map.ts";
+
+export default function coffee(next: Compiler): Compiler {
+	print("Loaded coffeescript!");
+	
+	return (filename, code, prevMap) => {
+		const {
+			js: result,
+			v3SourceMap: rawMap,
+		} = compile(code, {
+			filename,
+			sourceMap: true,
+			bare: true,
+		});
+
+		const map = SourceMap.parse({
+			file: "coffee-internal://" + filename,
+			mappings: JSON.parse(rawMap).mappings,
+			sources: [filename],
+		});
+
+		const compiled = next("coffee-internal://" + filename, result, SourceMap.chain(map, prevMap));
+		registerSource(filename, code);
+		return compiled;
+	};
+}
+

src/lib/transpiler/map.ts

@@ -123,13 +123,16 @@ export class VLQSourceMap {
 
 	public static parseVLQ(compiled: string, filenames: string[], raw: string): VLQSourceMap {
 		const mapping = decodeVLQ(raw);
-		const res = new Map<string, [start: number, dst: Location][][]>();
+		const file: [start: number, dst: Location][][] = [];
+		const res = new Map<string, [start: number, dst: Location][][]>([[compiled, file]]);
 
 		let originalRow = 0;
 		let originalCol = 0;
 		let originalFile = 0;
+		const lastCols = new Set<number>();
 
 		for (let compiledRow = 0; compiledRow < mapping.length; compiledRow++) {
+			const line = file[compiledRow] ??= [];
 			let compiledCol = 0;
 
 			for (const rawSeg of mapping[compiledRow]) {
@@ -138,12 +141,13 @@ export class VLQSourceMap {
 				originalRow += rawSeg.length > 2 ? rawSeg[2] : 0;
 				originalCol += rawSeg.length > 3 ? rawSeg[3] : 0;
 
-				let file = res.get(compiled);
-				if (file == null) res.set(compiled, file = []);
-
-				const line = file[compiledRow] ??= [];
+				if (!lastCols.has(compiledCol)) {
 					line[line.length] = [compiledCol, [filenames[originalFile], originalRow, originalCol]];
 				}
+				lastCols.add(compiledCol);
+			}
+
+			line.sort((a, b) => a[0] - b[0]);
 		}
 
 		return new VLQSourceMap(res);

src/lib/transpiler/types.ts

@@ -0,0 +1,10 @@
+import { type SourceMap } from "./map.ts";
+
+declare global {
+	type CompilerFactory = (next: Compiler) => Compiler;
+	type Compiler = (filename: string, src: string, mapper: SourceMap) => Function;
+
+	function print(...args: any[]): void;
+	function register(factory: CompilerFactory): void;
+	function registerSource(filename: string, src: string): void;
+}

src/lib/transpiler/typescript.ts

@@ -17,7 +17,7 @@ function resource(name: string) {
 	else return resources[name] = getResource(name);
 }
 
-register(next => {
+export default function typescript(next: Compiler): Compiler {
 	const files: Record<string, IScriptSnapshot> = {};
 	const versions: Record<string, number> = {};
 	let declI = 0;
@@ -34,6 +34,7 @@ register(next => {
 		forceConsistentCasingInFileNames: true,
 		declaration: true,
 		sourceMap: true,
+		downlevelIteration: true,
 	};
 
 	let service: LanguageService;
@@ -114,7 +115,7 @@ register(next => {
 		const result = outputs["/src.js"];
 		const declaration = outputs["/src.d.ts"];
 
-		const compiled = next("ts-internal://" + filename, result, SourceMap.chain(prevMap, map));
+		const compiled = next("ts-internal://" + filename, result, SourceMap.chain(map, prevMap));
 		registerSource(filename, code);
 
 		return function (this: any) {
@@ -123,4 +124,4 @@ register(next => {
 			return res;
 		};
 	};
-});
+}

src/main/java/me/topchetoeu/jscript/compilation/VariableDeclareNode.java

@@ -30,9 +30,22 @@ public class VariableDeclareNode extends Node {
 	}
 	@Override public void compile(CompileResult target, boolean pollute) {
 		for (var entry : values) {
+			var index = target.scope.get(entry.var.name, false);
+
 			if (entry.value != null) {
 				entry.value.compile(target, true);
-				target.add(VariableNode.toSet(target, loc(), entry.var.name, false, true)).setLocation(loc());
+			}
+
+			if (index == null) {
+				if (entry.value == null) {
+					target.add(Instruction.globDef(entry.var.name));
+				}
+				else {
+					target.add(Instruction.globSet(entry.var.name, false, true));
+				}
+			}
+			else if (entry.value != null) {
+				target.add(index.index().toSet(false));
 			}
 		}
 

src/main/java/me/topchetoeu/jscript/compilation/values/RegexNode.java

@@ -32,6 +32,7 @@ public class RegexNode extends Node {
 		var inBrackets = false;
 
 		loop: while (true) {
+			if (i + n >= src.size()) break;
 			switch (src.at(i + n)) {
 				case '[':
 					inBrackets = true;

src/main/java/me/topchetoeu/jscript/repl/debug/DebugServer.java

@@ -159,8 +159,10 @@ public class DebugServer {
 	}
 
 	public void awaitConnection() throws InterruptedException {
+		synchronized (connNotifier) {
 			connNotifier.wait();
 		}
+	}
 
 	public void run(InetSocketAddress address) {
 		try {

src/main/java/me/topchetoeu/jscript/repl/debug/SimpleDebugger.java

@@ -1032,15 +1032,20 @@ public class SimpleDebugger implements Debugger {
 		}
 		mappings.put(body, map);
 	}
+	
+	private boolean instructionLock;
+	
 	@Override public boolean onInstruction(Environment env, Frame cf, Instruction instruction, Value returnVal, EngineException error, boolean caught) {
 		if (!enabled) return false;
+		if (instructionLock) return false;
+		instructionLock = true;
 
+		try {
 			boolean isBreakpointable;
 			Location loc;
 			DebugFrame frame;
 			BreakpointType bptType;
 	
-		synchronized (this) {
 			frame = getFrame(cf);
 	
 			var map = DebugContext.get(env).getMap(frame.frame.function);
@@ -1077,6 +1082,8 @@ public class SimpleDebugger implements Debugger {
 				instruction.params.length == 1 &&
 				instruction.get(0).equals("debug")
 			) pauseDebug(env, null);
+	
+			synchronized (this) {
 			}
 	
 			while (enabled) {
@@ -1121,6 +1128,10 @@ public class SimpleDebugger implements Debugger {
 
 			return false;
 		}
+		finally {
+			instructionLock = false;
+		}
+	}
 	@Override public synchronized void onFramePush(Environment env, Frame frame) {
 		var prevFrame = currFrame;
 		updateFrames(env, 0);

src/main/java/me/topchetoeu/jscript/runtime/values/functions/Arguments.java

@@ -32,16 +32,17 @@ public class Arguments {
 	public Value self() {
 		return get(-1);
 	}
-	@SuppressWarnings("unchecked")
 	public <T> T self(Class<T> clazz) {
-		if (self instanceof UserValue user && clazz.isInstance(user.value)) return (T)user.value;
-		else return null;
+		return UserValue.unwrap(clazz, self);
 	}
 	public Value get(int i) {
 		if (i >= args.length || i < -1) return Value.UNDEFINED;
 		else if (i == -1) return self;
 		else return args[i];
 	}
+	public <T> T get(Class<T> clazz, int i) {
+		return UserValue.unwrap(clazz, get(i));
+	}
 	public Value getOrDefault(int i, Value def) {
 		if (i < -1 || i >= args.length) return def;
 		else return get(i);

src/main/java/me/topchetoeu/jscript/runtime/values/functions/FunctionValue.java

@@ -115,7 +115,7 @@ public abstract class FunctionValue extends ObjectValue {
 		this.length = length;
 		this.name = name;
 
-		prototype.defineOwnField(null, "constructor", this);
+		prototype.defineOwnField(null, "constructor", this, true, false, true);
 	}
 }
 

src/main/java/me/topchetoeu/jscript/runtime/values/primitives/UserValue.java

@@ -77,4 +77,10 @@ public final class UserValue<T> extends Value {
 	public static <T> UserValue<T> of(T value, ObjectValue prototype) {
 		return new UserValue<T>(value, prototype);
 	}
+
+	@SuppressWarnings("unchecked")
+	public static <T> T unwrap(Class<T> clazz, Value val) {
+		if (val instanceof UserValue user && clazz.isInstance(user.value)) return (T)user.value;
+		else return null;
+	}
 }