TypeError when watchOptions.ignored is not an array

[mhkeller]

Issue details

Per the docs, watchOptions.ignored can be any value passed to chokidar. The example shows *.txt for instance. It seems that ignored must be an array since lib/cli/transforms/copyCLIIgnoreToWatchOptions.ts called .concat on it. Indeed, if you try something like ignored: '*.txt' you'll get the error:

/path/to/node_modules/browser-sync/dist/cli/transforms/copyCLIIgnoreToWatchOptions.js:11
        return ignored.concat(userIgnore);
                       ^

TypeError: ignored.concat is not a function

Steps to reproduce/test case

Set watchOptions.ignored to '*.txt' and try to run the server.

Please specify which version of Browsersync, node and npm you're running

• Browsersync [2.24.4]
• Node [8.9.0]
• Npm [6.0.1]

Affected platforms

• linux
• windows
• OS X
• freebsd
• solaris
• other (please specify which)

Browsersync use-case

• API
• Gulp
• Grunt
• CLI

for all other use-cases, (gulp, grunt etc), please show us exactly how you're using Browsersync

'use strict';

module.exports = {
  server: {
    baseDir: './',
    directory: true
  },
  watchOptions: {
    ignoreInitial: true,
    ignored: new RegExp('\\.map$')
  },
  port: 8000,
  ui: {
    port: 3000
  },
  ghostMode: false,
  files: 'public/**/*',
  startPath: '/public/index.html',
  reloadDebounce: 750,
  notify: false,
  open: false,
  reloadOnRestart: true,
  logLevel: 'silent'
};

var bsConfig = require('./config.js');
bs.init(bsConfig);