Update dependencies

package.json

@@ -1,17 +1,17 @@
 {
   "name": "less-variables-to-json",
-  "version": "1.0.2",
+  "version": "1.1.0",
   "main": "src/index.js",
   "author": "Cameron Yan (Khell)",
   "repository": "https://github.com/khell/less-variables-to-json",
   "license": "MIT",
   "devDependencies": {
-    "chai": "^3.5.0",
-    "chai-as-promised": "^6.0.0",
-    "mocha": "^3.3.0"
+    "chai": "^4.2.0",
+    "chai-as-promised": "^7.1.1",
+    "mocha": "^7.0.0"
   },
   "dependencies": {
-    "less": "^2.7.2"
+    "less": "^3.10.3"
   },
   "scripts": {
     "test": "mocha"

test/test.js

@@ -43,13 +43,18 @@ describe('less-variables-to-json', function() {
     });
 
     it('should return JSON with only valid LESS transformed and invalid LESS stripped', function() {
-        let lessStr = "@myvar???:xsas 1234 @mycolor.#fff; @validvar: 60;";
+        let lessStr = "@myvar???:xsas 1234 mycolor.#fff; @validvar: 60;";
         let expectedJSON = {
             "@validvar": "60"
         };
 
         return lessVariablesToJson(lessStr).should.eventually.deep.equal(expectedJSON);
     });
+
+    it('should error if given undefined variable', function() {
+        let lessStr = "@myvar: 1234; .myclass { color: @mycolor }";
+        return lessVariablesToJson(lessStr).should.eventually.be.rejected;
+    });
 
     it('should error if given malformed LESS with no terminating semicolon', function() {
         let lessStr = "@myvar: 1234; @mycolor: #fff";