browserstack-local: bs_Local.isRunning() returns undefined #80

Issue:
bs_Local.isRunning() is always returns undefined.

Details

My Code:
const browserstackLocal = require('browserstack-local');
const bs_Local = new browserstackLocal.Local();

/* Function to establish local connection */
async newBrowserLocal(browserStackConfig) {
const bsLocalArgs = { key: browserStackConfig.bsKey, forcelocal: 'true' };
await bs_Local.start(bsLocalArgs, async function () {
await console.log('Started BrowserStackLocal');
});
}
await console.log(bs_Local.isRunning());

output:
Started BrowserStackLocal
undefined