Generate nightly version based on latest npm version

.github/workflows/nightly/setNightlyVersion.js

@@ -6,6 +6,7 @@
 //@ts-check
 
 const fs = require('fs');
+const cp = require('child_process');
 
 if (process.argv.length !== 3) {
 	console.error(`usage: node updateVersion.js <PATH_TO_PACKAGE_JSON_FILE>`);
@@ -13,10 +14,37 @@ if (process.argv.length !== 3) {
 }
 
 const packagejson = JSON.parse(fs.readFileSync(process.argv[2]).toString());
+const packageName = packagejson.name;
+if (packageName !== 'monaco-editor' && packageName !== 'monaco-editor-core') {
+	console.error(`expected name to be 'monaco-editor' or 'monaco-editor-core'`);
+	process.exit(1);
+}
+
+/** @type {string} */
+const latestVersion = (() => {
+	const output = cp.execSync(`npm show ${packageName} version`).toString();
+	const version = output.split(/\r\n|\r|\n/g)[0];
+	if (!/\d+\.\d+\.\d+/.test(version)) {
+		console.log('unrecognized package.json version: ' + version);
+		process.exit(1);
+	}
+	return version;
+})();
+
+if (!/^0\.(\d+)\.(\d+)$/.test(latestVersion)) {
+	console.error(`version ${latestVersion} does not match 0.x.y`);
+	process.exit(1);
+}
+
+const devVersion = (() => {
+	const pieces = latestVersion.split('.');
+	const minor = parseInt(pieces[1], 10);
+	const date = new Date();
+	const yyyy = date.getUTCFullYear();
+	const mm = String(date.getUTCMonth() + 1).padStart(2, '0');
+	const dd = String(date.getUTCDate()).padStart(2, '0');
+	return `0.${minor + 1}.0-dev.${yyyy}${mm}${dd}`;
+})();
 
-const date = new Date();
-packagejson.version += `-dev.${date.getUTCFullYear()}${String(date.getUTCMonth() + 1).padStart(
-	2,
-	'0'
-)}${String(date.getUTCDate()).padStart(2, '0')}`;
+packagejson.version = devVersion;
 fs.writeFileSync(process.argv[2], JSON.stringify(packagejson, null, '\t') + '\n');