pngquant options.quality error

[tuticapi]

When the command bin/build-mysite is run
It shows the error:

• Module build failed: ArgumentError: Expected options.quality to be of type array but received type string
  

The solution that I have used is:

Change in the config.js file the value of pngquant.quality to array
like this:

new code

 pngquant: {
   quality: [0.65, 0.90]
   },

old code

pngquant: {
    quality: "65-90",
 },