Added check if overriden value is primitive value like number or bool…

…ean (#508)

* Added check if overriden value is primitive value like number or boolean

* Fixed formatting

scripts/utils/rewireJestConfig.js

@@ -16,7 +16,7 @@ module.exports = (config) => {
     .forEach(key => {
       //We don't overwrite the default config, but add to each property if not a string
       if(config[key]) {
-        if(typeof overrides[key] === 'string') {
+        if(typeof overrides[key] === 'string' || typeof overrides[key] === 'number' || typeof overrides[key] === 'boolean') {
           config[key] = overrides[key];
         } else if(Array.isArray(overrides[key])) {
           config[key] = overrides[key].concat(config[key]);