[New] add types

Author: ljharb

index.d.ts

@@ -0,0 +1,9 @@
+import whichTypedArray from 'which-typed-array';
+
+declare namespace hasTypedArrays {
+    type TypedArrayName = whichTypedArray.TypedArrayName;
+}
+
+declare function hasTypedArrays(): boolean;
+
+export = hasTypedArrays;

index.js

@@ -3,6 +3,7 @@
 var some = require('array.prototype.some');
 var whichTypedArray = require('which-typed-array');
 
+/** @type {import('.').TypedArrayName[]} */
 var typedArrays = [
 	'Float32Array',
 	'Float64Array',
@@ -18,7 +19,7 @@ var typedArrays = [
 ];
 
 module.exports = function hasTypedArrays() {
-	return some(typedArrays, function (TA) {
-		return whichTypedArray(new global[TA]());
+	return some(typedArrays, /** @param {import('.').TypedArrayName} TA */ function (TA) {
+		return !!whichTypedArray(new global[TA]());
 	});
 };

package.json

@@ -12,6 +12,7 @@
 		"prepublishOnly": "safe-publish-latest",
 		"prepublish": "not-in-publish || npm run prepublishOnly",
 		"lint": "eslint --ext=js,mjs .",
+		"postlint": "tsc && attw -P",
 		"pretest": "npm run lint",
 		"tests-only": "nyc tape 'test/**/*.js'",
 		"test:harmony": "nyc node --harmony --es-staging test",
@@ -48,15 +49,19 @@
 	},
 	"homepage": "https://github.com/inspect-js/has-typed-arrays#readme",
 	"devDependencies": {
+		"@arethetypeswrong/cli": "^0.17.1",
 		"@ljharb/eslint-config": "^21.1.1",
+		"@ljharb/tsconfig": "^0.2.2",
+		"@types/tape": "^5.6.5",
 		"auto-changelog": "^2.5.0",
 		"encoding": "^0.1.13",
 		"eslint": "=8.8.0",
 		"in-publish": "^2.0.1",
 		"npmignore": "^0.3.1",
 		"nyc": "^10.3.2",
 		"safe-publish-latest": "^2.0.0",
-		"tape": "^5.9.0"
+		"tape": "^5.9.0",
+		"typescript": "next"
 	},
 	"funding": {
 		"url": "https://github.com/sponsors/ljharb"
@@ -75,7 +80,8 @@
 	},
 	"publishConfig": {
 		"ignore": [
-			".github/workflows"
+			".github/workflows",
+			"types"
 		]
 	}
 }

test/index.js

@@ -11,7 +11,7 @@ test('export', function (t) {
 });
 
 test('Typed Arrays', function (t) {
-	var anyExist = some([
+	var anyExist = some(/** @type {import('..').TypedArrayName[]} */ [
 		'Float32Array',
 		'Float64Array',
 		'Int8Array',
@@ -23,7 +23,7 @@ test('Typed Arrays', function (t) {
 		'Uint32Array',
 		'BigInt64Array',
 		'BigUint64Array'
-	], function (TA) {
+	], /** @param {import('..').TypedArrayName} TA */ function (TA) {
 		return typeof global[TA] === 'function';
 	});
 

tsconfig.json

@@ -0,0 +1,9 @@
+{
+	"extends": "@ljharb/tsconfig",
+	"compilerOptions": {
+		"maxNodeModuleJsDepth": 0,
+	},
+	"exclude": [
+		"coverage"
+	]
+}

types/array.prototype.some/index.d.ts

@@ -0,0 +1,9 @@
+declare module 'array.prototype.some' {
+	function some<T>(
+		arr: T[],
+		callbackfn: (value: T, index?: number, array?: T[]) => boolean,
+		thisArg?: unknown,
+	): boolean;
+
+	export = some;
+}