Refactor TypeScript definition to CommonJS compatible export (#3)

index.d.ts

@@ -1,4 +1,32 @@
-/**
- * Check if a value is an error constructor.
- */
-export default function isErrorConstructor(value: unknown): value is ErrorConstructor;
+declare const isErrorConstructor: {
+	/**
+	Check if a value is an error constructor.
+
+	@example
+	```
+	import isErrorConstructor = require('is-error-constructor');
+
+	isErrorConstructor(Error);
+	//=> true
+
+	isErrorConstructor(RangeError);
+	//=> true
+
+	function FakeError() {}
+	isErrorConstructor(FakeError);
+	//=> false
+
+	class UnicornError extends Error {}
+	isErrorConstructor(UnicornError);
+	//=> true
+	```
+	*/
+	(value: unknown): value is ErrorConstructor;
+
+	// TODO: Remove this for the next major release, refactor the whole definition to:
+	// declare function isErrorConstructor(value: unknown): value is ErrorConstructor;
+	// export = isErrorConstructor;
+	default: typeof isErrorConstructor;
+};
+
+export = isErrorConstructor;

index.js

@@ -4,4 +4,5 @@ const isErrorConstructor = constructor =>
 	constructor === Error || constructor.prototype instanceof Error;
 
 module.exports = isErrorConstructor;
+// TODO: Remove this for the next major release
 module.exports.default = isErrorConstructor;

index.test-d.ts

@@ -1,5 +1,5 @@
-import {expectType} from 'tsd-check';
-import isErrorConstructor from '.';
+import {expectType} from 'tsd';
+import isErrorConstructor = require('.');
 
 const foo = 'foo';
 

package.json

@@ -13,7 +13,7 @@
 		"node": ">=8"
 	},
 	"scripts": {
-		"test": "xo && ava && tsd-check"
+		"test": "xo && ava && tsd"
 	},
 	"files": [
 		"index.js",
@@ -29,8 +29,8 @@
 		"instanceof"
 	],
 	"devDependencies": {
-		"ava": "^1.3.1",
-		"tsd-check": "^0.3.0",
+		"ava": "^1.4.1",
+		"tsd": "^0.7.2",
 		"xo": "^0.24.0"
 	}
 }