wdio json output file reporter
npm install wdio-json-output-reportersimilar format as mocha-spec-json-output-reporter
```
const Reporter = require('wdio-json-output-reporter');
add reporter to reporters:
``
exports.config = {
reporters: [Reporter]
};
exports.config = {
reporterOptions: {
fileName: '',
filePath: '',
hierarchy: true
}
};
``