use bash test harness

package.json

@@ -4,7 +4,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "node node_modules/.bin/tsc && node node_modules/.bin/jest"
+    "test": "bash scripts/tests.bash"
   },
   "author": "",
   "license": "ISC",

scripts/test.bash

@@ -0,0 +1,11 @@
+#!/bin/bash
+(set -o igncr) 2>/dev/null && set -o igncr; # For Cygwin on Windows compatibility
+
+./node_modules/.bin/tsc
+if [ $? != 0 ]; then
+    printf "tsc failed\n"
+	exit 1
+fi
+
+node scripts/test
+exit $?