keywordEnabled=trueでMeCabがインストールされていない場合は起動前に異常終了する

package.json

@@ -2,7 +2,7 @@
 	"_v": "1.5.0",
 	"main": "./built/index.js",
 	"scripts": {
-		"start": "node ./built",
+		"start": "./start.sh",
 		"build": "tsc",
 		"test": "jest"
 	},

start.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+if (! which mecab) && (grep keywordEnabled config.json | grep -q true); then
+  echo "You must install MeCab if keywordEnabled is true."
+  exit 1
+fi
+
+node ./built