Remove support for TS 4.1

Author: wooorm

lib/extract-legacy.ts

@@ -3,6 +3,26 @@
  * @typedef {import('hast').Element} Element
  */
 
+/**
+ * @template {string} SimpleSelector
+ * @template {string} DefaultTagName
+ * @typedef {(
+ *   SimpleSelector extends `#${infer Rest}`
+ *     ? DefaultTagName
+ *     : SimpleSelector extends `.${infer Rest}`
+ *     ? DefaultTagName
+ *     : SimpleSelector extends `${infer TagName}.${infer Rest}`
+ *     ? ExtractTagName<TagName, DefaultTagName>
+ *     : SimpleSelector extends `${infer TagName}#${infer Rest}`
+ *     ? TagName
+ *     : SimpleSelector extends ''
+ *     ? DefaultTagName
+ *     : SimpleSelector extends string
+ *     ? SimpleSelector
+ *     : DefaultTagName
+ * )} ExtractTagName
+ */
+
 const search = /[#.]/g
 
 /**
@@ -20,7 +40,7 @@ const search = /[#.]/g
  *   Uses the last ID if multiple IDs are found.
  * @param {DefaultTagName | null | undefined} [defaultTagName='div']
  *   Tag name to use if `selector` does not specify one (default: `'div'`).
- * @returns {Element & {tagName: import('./extract.js').ExtractTagName<Selector, DefaultTagName>}}
+ * @returns {Element & {tagName: ExtractTagName<Selector, DefaultTagName>}}
  *   Built element.
  */
 export function parseSelector(selector, defaultTagName) {

lib/extract.ts

@@ -28,13 +28,6 @@
   "type": "module",
   "main": "index.js",
   "types": "index.d.ts",
-  "typesVersions": {
-    "<=4.1": {
-      "lib/extract.d.ts": [
-        "lib/extract-legacy.d.ts"
-      ]
-    }
-  },
   "files": [
     "lib/",
     "index.d.ts",
@@ -56,7 +49,7 @@
   },
   "scripts": {
     "prepack": "npm run build && npm run format",
-    "build": "tsc --build --clean && tsc --build && type-coverage",
+    "build": "tsc --build --clean && tsc --build && type-coverage && tsd",
     "format": "remark . -qfo && prettier . -w --log-level warn && xo --fix",
     "test-api": "node --conditions development test.js",
     "test-coverage": "c8 --100 --reporter lcov npm run test-api",