Refactor TypeScript definition to CommonJS compatible export (#15)

index.d.ts

@@ -1,26 +1,41 @@
 import {Primitive, JsonObject} from 'type-fest';
 
-export type ErrorObject = {
-	name?: string;
-	stack?: string;
-	message?: string;
-	code?: string;
-} & JsonObject;
-
-/**
-Serialize an error into a plain object.
-
-@example
-```
-import serializeError from 'serialize-error';
-
-const error = new Error('🦄');
-
-console.log(error);
-//=> [Error: 🦄]
-
-console.log(serializeError(error));
-//=> {name: 'Error', message: '🦄', stack: 'Error: 🦄\n    at Object.<anonymous> …'}
-```
-*/
-export default function serializeError<ErrorType>(error: ErrorType): ErrorType extends Primitive ? ErrorType : ErrorObject;
+declare namespace serializeError {
+	type ErrorObject = {
+		name?: string;
+		stack?: string;
+		message?: string;
+		code?: string;
+	} & JsonObject;
+}
+
+declare const serializeError: {
+	/**
+	Serialize an error into a plain object.
+
+	@example
+	```
+	import serializeError = require('serialize-error');
+
+	const error = new Error('🦄');
+
+	console.log(error);
+	//=> [Error: 🦄]
+
+	console.log(serializeError(error));
+	//=> {name: 'Error', message: '🦄', stack: 'Error: 🦄\n    at Object.<anonymous> …'}
+	```
+	*/
+	<ErrorType>(error: ErrorType): ErrorType extends Primitive
+		? ErrorType
+		: serializeError.ErrorObject;
+
+	// TODO: Remove this for the next major release, refactor the whole definition to:
+	// declare function serializeError<ErrorType>(
+	// 	error: ErrorType
+	// ): ErrorType extends Primitive ? ErrorType : ErrorObject;
+	// export = serializeError;
+	default: typeof serializeError;
+};
+
+export = serializeError;

index.js

@@ -54,4 +54,5 @@ const serializeError = value => {
 };
 
 module.exports = serializeError;
+// TODO: Remove this for the next major release
 module.exports.default = serializeError;

index.test-d.ts

@@ -1,5 +1,6 @@
-import {expectType} from 'tsd-check';
-import serializeError, {ErrorObject} from '.';
+import {expectType} from 'tsd';
+import serializeError = require('.');
+import {ErrorObject} from '.';
 
 const error = new Error('unicorn');
 

package.json

@@ -13,7 +13,7 @@
 		"node": ">=8"
 	},
 	"scripts": {
-		"test": "xo && ava && tsd-check"
+		"test": "xo && ava && tsd"
 	},
 	"files": [
 		"index.js",
@@ -32,8 +32,8 @@
 		"type-fest": "^0.3.0"
 	},
 	"devDependencies": {
-		"ava": "^1.3.1",
-		"tsd-check": "^0.5.0",
+		"ava": "^1.4.1",
+		"tsd": "^0.7.1",
 		"xo": "^0.24.0"
 	}
 }