Use module augmentation to define missing types

This removes the need for some `@ts-expect-error` comments.

example/create-tree.js

@@ -6,13 +6,7 @@
 
 /* eslint-env browser */
 
-// @ts-expect-error: TS in VS Code doesn’t seem to infer this.
-import * as hastscript from 'https://esm.sh/hastscript@8?dev'
-
-/** @type {typeof import('hastscript').h} */
-const h = hastscript.h
-/** @type {typeof import('hastscript').s} */
-const s = hastscript.s
+import {h, s} from 'https://esm.sh/hastscript@8?dev'
 
 export function createTree() {
   return h('div', [

test/index.js

@@ -25,13 +25,16 @@ import {renderToStaticMarkup} from 'react-dom/server'
 // @ts-expect-error: ESM types are wrong.
 const Sval = sval.default
 
-/** @type {{Fragment: Fragment, jsx: Jsx, jsxs: Jsx}} */
-// @ts-expect-error: the react types are missing.
-const production = {Fragment: prod.Fragment, jsx: prod.jsx, jsxs: prod.jsxs}
+const production = /** @type {{Fragment: Fragment, jsx: Jsx, jsxs: Jsx}} */ ({
+  Fragment: prod.Fragment,
+  jsx: prod.jsx,
+  jsxs: prod.jsxs
+})
 
-/** @type {{Fragment: Fragment, jsxDEV: JsxDev}} */
-// @ts-expect-error: the react types are missing.
-const development = {Fragment: dev.Fragment, jsxDEV: dev.jsxDEV}
+const development = /** @type {{Fragment: Fragment, jsxDEV: JsxDev}} */ ({
+  Fragment: dev.Fragment,
+  jsxDEV: dev.jsxDEV
+})
 
 test('core', async function (t) {
   await t.test('should expose the public api', async function () {

tsconfig.json

@@ -11,5 +11,5 @@
     "target": "es2022"
   },
   "exclude": ["coverage/", "node_modules/"],
-  "include": ["**/**.js", "lib/components.d.ts"]
+  "include": ["**/**.js", "lib/components.d.ts", "types.d.ts"]
 }