TS: add compatibility types for v4.7-v5.4

And change `test-node` to use mocha with tsx instead of ts-node,
since the latter has issues with esm module resolutions involving
typesVersions.

Syntax ref: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-9.html#exports-is-prioritized-over-typesversions

Author: larabr

lib/dom.d.ts renamed to lib/types/dom.d.ts

@@ -0,0 +1,29 @@
+/// <reference lib="dom" />
+
+import type { ReadableStream as NodeWebReadableStream } from 'node:stream/web';
+type DomReadableStream<R> = ReadableStream<R>;
+
+type Data = Uint8Array | string;
+
+export type WebStream<T extends Data> = DomReadableStream<T>
+export type NodeWebStream<T extends Data> = NodeWebReadableStream<T>;
+
+type Stream<T extends Data> = WebStream<T> | NodeWebStream<T>;
+type MaybeStream<T extends Data> = T | Stream<T>;
+
+export function readToEnd<T extends Data, JoinFn extends (chunks: T[]) => any = (chunks: T[]) => T>(
+  input: MaybeStream<T>,
+  join?: JoinFn
+): Promise<ReturnType<JoinFn>>;
+
+export function toStream<T extends Data, InputType extends MaybeStream<T>>(
+  input: InputType
+): InputType extends T ? Stream<InputType> : InputType;
+
+export function isStream<T extends Data>(input: MaybeStream<T>): input is Stream<T>;
+
+export function slice<T extends Data, InputType extends MaybeStream<T>>(
+  input: InputType,
+  begin: number,
+  end?: number | typeof Infinity
+): InputType; // same as 'typeof input'

lib/index.d.ts renamed to lib/types/index.d.ts

@@ -8,10 +8,14 @@
     "tsconfig.json"
   ],
   "exports": {
-    "types": "./lib/index.d.ts",
+    "types@<5.5": "./lib/types/v4.7-v5.4/index.d.ts",
+    "types": "./lib/types/index.d.ts",
     "import": "./lib/index.js"
   },
-  "types": "./lib/index.d.ts",
+  "typesVersions": {
+    ">=5.5": { ".": ["lib/types/index.d.ts"] },
+    ">=4.7": { ".": ["lib/types/v4.7-v5.4/index.d.ts"] }
+  },
   "main": "./lib/index.js",
   "engines": {
     "node": ">= 18.0.0"
@@ -66,7 +70,7 @@
     "test-type-definitions": "tsc --project test/tsconfig.json && tsx test/typescript.test.ts && npm run test-type-definitions-es5",
     "test-type-definitions-es5": "tsc --project test/tsconfig.es5.json && tsx --tsconfig test/tsconfig.es5.json test/typescript.test.ts",
     "test-browser": "karma start karma.conf.cjs",
-    "test-node": "ts-mocha -n loader=ts-node/esm ./test/node.test.ts ./test/common.test.ts",
+    "test-node": "NODE_OPTIONS='--import=tsx' mocha ./test/node.test.ts ./test/common.test.ts",
     "lint": "eslint lib test",
     "docs": "jsdoc --configure .jsdocrc.cjs --destination docs --readme README.md lib && printf '%s' 'web-stream-tools.openpgpjs.org' > docs/CNAME",
     "preversion": "rm -rf docs",