Support custom value callback

[devpreview]

For example:

new ScriptExtHtmlWebpackPlugin({
  custom: [
    {
      test: /\.js$/,
      attribute: 'onload',
      value: (entry) => {return 'alert("loaded ' + entry + '");'}
     }
   ]
}),

[numical]

Can you explain the use case?
When is the function called and what is passed to it?

[lili21]

I think it would be useful for things like tracking the resources which load failed.

new ScriptExtHtmlWebpackPlugin({
  custom: [
    {
      test: /\.js$/,
      attribute: 'onerror',
      value: e => { // track the resource }
     }
   ]
}),

[numical]

Sorry - still not clear on when the function wuld be called and hat data would be passed.
Happy to re-open if more clarity available - or better a spike-PR! :-)

[ykxkknd2]

@numical I need this too. For example, When the resource requested fails, and the error event is reported to the log.The callback parameter is the filename. Like this

new ScriptExtHtmlWebpackPlugin({
  custom: [
    {
      test: /\.js$/,
      attribute: 'onerror',
      value: filename => report(filename)
     }
   ]
}),