Build: Make the release script an ES module

This is now required by the latest chalk versions.

Closes gh-459

Author: mgol

.eslintrc.json

@@ -1,5 +1,14 @@
 {
 	"root": true,
 
-	"extends": "./.eslintrc-node.json"
+	"extends": "./.eslintrc-node.json",
+
+	"overrides": [
+		{
+			"files": ["**/*.mjs"],
+			"parserOptions": {
+				"sourceType": "module"
+			}
+		}
+	]
 }

build/release.js build/release.mjs

@@ -9,17 +9,19 @@
 var	dryrun = false,
 	skipRemote = false;
 
-var fs = require( "fs" ),
-	child = require( "child_process" ),
-	path = require( "path" ),
-	chalk = require( "chalk" ),
-	{ prompt } = require( "enquirer" );
+import fs from "fs";
+import child from "child_process";
+import path from "path";
+import chalk from "chalk";
+import enquirer from "enquirer";
 
 var releaseVersion,
 	nextVersion,
 	isBeta,
 	pkg,
 
+	prompt = enquirer.prompt,
+
 	repoURL = "git@github.com:jquery/jquery-migrate.git",
 	branch = "main",