feat: more mixins

src/internal.ts

@@ -9,5 +9,51 @@ export const never = undefined as never;
 
 export type Constraint<T, U extends T> = U;
 
-// eslint-disable-next-line @typescript-eslint/no-empty-object-type
-export type Empty = Constraint<Record<PropertyKey, unknown>, {}>;
+export class AssertionError extends Error {
+	public constructor(msg?: string) {
+		super(msg);
+		this.name = "AssertionError";
+	}
+}
+
+export function assert(
+	condition: unknown,
+	msg?: string,
+): asserts condition {
+	if (!Boolean(condition))
+		throw new AssertionError(
+			["Assertion error", msg]
+				.filter((v) => v !== undefined)
+				.join(": "),
+		);
+}
+
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-parameters, @typescript-eslint/no-unused-vars
+export function assertType<T>(_v: unknown): asserts _v is T {
+	/* empty */
+}
+
+// eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
+type FunctionProto = Function;
+export interface HidePrototype {
+	/** @deprecated */
+	apply: FunctionProto["apply"];
+	/** @deprecated */
+	arguments: FunctionProto["arguments"];
+	/** @deprecated */
+	bind: FunctionProto["bind"];
+	/** @deprecated */
+	call: FunctionProto["call"];
+	/** @deprecated */
+	caller: FunctionProto["caller"];
+	/** @deprecated */
+	length: FunctionProto["length"];
+	/** @deprecated */
+	name: FunctionProto["name"];
+	/** @deprecated */
+	prototype: FunctionProto["prototype"];
+	/** @deprecated */
+	toString: FunctionProto["toString"];
+	/** @deprecated */
+	Symbol: SymbolConstructor;
+}