resolved node version checking bug

check-version.js

@@ -1,20 +1,50 @@
 
-const exec = require('child_process').exec;
 
-exec("npm install semver",(error,stdout, stderr) => {
-    if(error){
-        console.log(error);
-    }else{
+const package = require('./package.json')
 
-        const package = require('./package.json')
-        semver = require('semver');
+const current_version = `${process.version.substr(1,process.version.length)}`,
+    expected_version = `${package.engines.node.substr(2,package.engines.node.length)}`;
 
-        const current_version = `${process.version.substr(1,process.version.length)}`,
-            expected_version = `${package.engines.node.substr(2,package.engines.node.length)}`;
+if(!compare(current_version,expected_version)){
+    console.error(`Node 8.10.0 or later is required.`);
+    process.exit(1);
+}
 
-        if(!semver.gte(current_version,expected_version)){
-            console.error(`Node 8.10.0 or later is required.`);
-            process.exit(1);
+// comparing node version
+function compare(a, b) {
+    if (a === b) {
+       return true;
+    }
+
+    var a_components = a.split(".");
+    var b_components = b.split(".");
+
+    var len = Math.min(a_components.length, b_components.length);
+
+    // loop while the components are equal
+    for (var i = 0; i < len; i++) {
+        // A bigger than B
+        if (parseInt(a_components[i]) > parseInt(b_components[i])) {
+            return true;
+        }
+
+        // B bigger than A
+        if (parseInt(a_components[i]) < parseInt(b_components[i])) {
+            return false;
         }
     }
-});
+
+    // If one's a prefix of the other, the longer one is greater.
+    if (a_components.length >= b_components.length) {
+        return true;
+    }
+
+    if (a_components.length < b_components.length) {
+        return false;
+    }
+
+    // Otherwise they are the same.
+    return true;
+}
+
+