Init commit.

@types/node/compatibility/disposable.d.ts

@@ -0,0 +1,14 @@
+// Polyfills for the explicit resource management types added in TypeScript 5.2.
+
+interface SymbolConstructor {
+    readonly dispose: unique symbol;
+    readonly asyncDispose: unique symbol;
+}
+
+interface Disposable {
+    [Symbol.dispose](): void;
+}
+
+interface AsyncDisposable {
+    [Symbol.asyncDispose](): PromiseLike<void>;
+}

@types/node/compatibility/index.d.ts

@@ -0,0 +1,9 @@
+// Declaration files in this directory contain types relating to TypeScript library features
+// that are not included in all TypeScript versions supported by DefinitelyTyped, but
+// which can be made backwards-compatible without needing `typesVersions`.
+// If adding declarations to this directory, please specify which versions of TypeScript require them,
+// so that they can be removed when no longer needed.
+
+/// <reference path="disposable.d.ts" />
+/// <reference path="indexable.d.ts" />
+/// <reference path="iterators.d.ts" />

@types/node/compatibility/indexable.d.ts

@@ -0,0 +1,20 @@
+// Polyfill for ES2022's .at() method on string/array prototypes, added to TypeScript in 4.6.
+
+interface RelativeIndexable<T> {
+    at(index: number): T | undefined;
+}
+
+interface String extends RelativeIndexable<string> {}
+interface Array<T> extends RelativeIndexable<T> {}
+interface ReadonlyArray<T> extends RelativeIndexable<T> {}
+interface Int8Array extends RelativeIndexable<number> {}
+interface Uint8Array extends RelativeIndexable<number> {}
+interface Uint8ClampedArray extends RelativeIndexable<number> {}
+interface Int16Array extends RelativeIndexable<number> {}
+interface Uint16Array extends RelativeIndexable<number> {}
+interface Int32Array extends RelativeIndexable<number> {}
+interface Uint32Array extends RelativeIndexable<number> {}
+interface Float32Array extends RelativeIndexable<number> {}
+interface Float64Array extends RelativeIndexable<number> {}
+interface BigInt64Array extends RelativeIndexable<bigint> {}
+interface BigUint64Array extends RelativeIndexable<bigint> {}

@types/node/compatibility/iterators.d.ts

@@ -0,0 +1,20 @@
+// Backwards-compatible iterator interfaces, augmented with iterator helper methods by lib.esnext.iterator in TypeScript 5.6.
+// The IterableIterator interface does not contain these methods, which creates assignability issues in places where IteratorObjects
+// are expected (eg. DOM-compatible APIs) if lib.esnext.iterator is loaded.
+// Also ensures that iterators returned by the Node API, which inherit from Iterator.prototype, correctly expose the iterator helper methods
+// if lib.esnext.iterator is loaded.
+
+// Placeholders for TS <5.6
+interface IteratorObject<T, TReturn, TNext> {}
+interface AsyncIteratorObject<T, TReturn, TNext> {}
+
+declare namespace NodeJS {
+    // Populate iterator methods for TS <5.6
+    interface Iterator<T, TReturn, TNext> extends globalThis.Iterator<T, TReturn, TNext> {}
+    interface AsyncIterator<T, TReturn, TNext> extends globalThis.AsyncIterator<T, TReturn, TNext> {}
+
+    // Polyfill for TS 5.6's instrinsic BuiltinIteratorReturn type, required for DOM-compatible iterators
+    type BuiltinIteratorReturn = ReturnType<any[][typeof Symbol.iterator]> extends
+        globalThis.Iterator<any, infer TReturn> ? TReturn
+        : any;
+}