Plugin options

Option	Type	Required	Default value	Description
`outputDir`	`string`	false	regression	Working directory. Images, report, etc will be saved into this folder
`instanceFolder`	`Function`	false	undefined	Callback to create folder by specific browser. See details below
`customMatchers`	`Function[]`	false	[ ]	Add custom matchers to webdriverio
`largeImageThreshold`	`number`	false	1200	Skips pixels when the image width or height is larger than this one
`allowedMismatch`	`number`	false	0.1	Ignore failed result if mismatch percentage less than allowed

This option allow to provide custom folder name per each browser. The callback must return folder name as string. For example:

instanceFolder: info => {
  const [ version ] = info.browserVersion.split('.');
  return `${ info.browserName }_${ version }`;
}

The callback's argument contain the following properties:

interface BrowserInfo {
  browserName?: string;
  browserVersion?: string;
  platform?: string;
}

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