[types] improve types

Author: ljharb

Diff for: index.d.ts

@@ -1,17 +1,14 @@
-type TypedArray =
-	| Int8Array
-	| Uint8Array
-	| Uint8ClampedArray
-	| Int16Array
-	| Uint16Array
-	| Int32Array
-	| Uint32Array
-	| Float32Array
-	| Float64Array
-	| BigInt64Array
-	| BigUint64Array;
+import TypedArrayNames from 'possible-typed-array-names';
 
-declare function typedArrayByteOffset(value: TypedArray): number;
+declare namespace typedArrayByteOffset {
+    export type TypedArrayName = typeof TypedArrayNames[number];
+
+	export type TypedArrayConstructor = typeof globalThis[TypedArrayName];
+
+	export type TypedArray = TypedArrayConstructor['prototype'];
+}
+
+declare function typedArrayByteOffset(value: typedArrayByteOffset.TypedArray): number;
 declare function typedArrayByteOffset(value: unknown): false;
 
 export = typedArrayByteOffset;

Diff for: index.js

@@ -6,11 +6,13 @@ var gPO = require('reflect.getprototypeof/polyfill')();
 
 var typedArrays = require('available-typed-arrays')();
 
-/** @typedef {Int8Array | Uint8Array | Uint8ClampedArray | Int16Array | Uint16Array | Int32Array | Uint32Array | Float32Array | Float64Array | BigInt64Array | BigUint64Array} TypedArray */
-/** @typedef {(x: TypedArray) => number} ByteOffsetGetter */
+/** @typedef {(x: import('.').TypedArray) => number} ByteOffsetGetter */
 
-/** @type {Object.<typeof typedArrays, ByteOffsetGetter>} */
-var getters = {};
+/** @type {Record<import('.').TypedArrayName, ByteOffsetGetter>} */
+var getters = {
+	// @ts-expect-error TS can't handle __proto__ or `satisfies` in jsdoc
+	__proto__: null
+};
 
 var gOPD = require('gopd');
 var oDP = Object.defineProperty;