this.program
...
            .option('-b, --list-browsers [provider]', 'output the aliases for local browsers or browsers available through the specified browser provider')
            .option('-r, --reporters <name[:outputFile][,...]>', 'specify the reporters and optionally files where reports are saved')
            .option('--reporter <name[:outputFile][,...]>', '[OBSOLETE] specify the reporter. Use --reporters instead')
            .option('-s, --screenshots <path>', 'enable screenshot capturing and specify the path to save the screenshots to')
...
async _parseReporters () {
        const reportersArg = this.opts.reporters || this.opts.reporter;

        if (!reportersArg) {
              this.opts.reporters = [];
              return;
	}

        const reporters = this.opts.reporter.split(',');