npm scriptの互換性を修正

package.json

@@ -28,7 +28,8 @@
 		"mocha": "cd packages/backend && cross-env TS_NODE_FILES=true TS_NODE_TRANSPILE_ONLY=true TS_NODE_PROJECT=\"./test/tsconfig.json\" npx mocha",
 		"test": "npm run mocha",
 		"format": "gulp format",
-		"clean": "node ./scripts/clean.js"
+		"clean": "node ./scripts/clean.js",
+		"clean-all": "node ./scripts/clean-all.js"
 	},
 	"dependencies": {
 		"@types/gulp": "4.0.9",

scripts/clean-all.js

+const fs = require('fs');
+
+(async () => {
+	fs.rmSync(__dirname + '/../packages/backend/built', { recursive: true, force: true });
+	fs.rmSync(__dirname + '/../packages/backend/node_modules', { recursive: true, force: true });
+
+	fs.rmSync(__dirname + '/../packages/client/built', { recursive: true, force: true });
+	fs.rmSync(__dirname + '/../packages/client/node_modules', { recursive: true, force: true });
+
+	fs.rmSync(__dirname + '/../built', { recursive: true, force: true });
+	fs.rmSync(__dirname + '/../node_modules', { recursive: true, force: true });
+})();

scripts/clean.js

 const fs = require('fs');
-const execa = require('execa');
 
 (async () => {
 	fs.rmSync(__dirname + '/../packages/backend/built', { recursive: true, force: true });
-	fs.rmSync(__dirname + '/../packages/backend/node_modules', { recursive: true, force: true });
-
 	fs.rmSync(__dirname + '/../packages/client/built', { recursive: true, force: true });
-	fs.rmSync(__dirname + '/../packages/client/node_modules', { recursive: true, force: true });
-
 	fs.rmSync(__dirname + '/../built', { recursive: true, force: true });
-	fs.rmSync(__dirname + '/../node_modules', { recursive: true, force: true });
 })();