Validation of passed options

[kcebula]

Hello guys,

Recently I spent embarrassingly long amount of time looking for an error in my configuration (missed an 's' in 'astTransformers').
I thought that it would be fairly easy and quite helpful for people like me, to add a validation of passed options, with simple warning if any unknown option would be encountered.
I'd like to ask if you would be willing to accept PR bringing this change?

Issue :

ts-jest silently ignores unrecognized options
eg:

globals: {
    'ts-jest': {
      stringifyContentPathRegex: '\\.html$',
      tsConfig: 'tsconfig.json',
      astTransformer: [require.resolve('jest-preset-angular/InlineHtmlStripStylesTransformer')]
    },
  },

note missing 's' in 'astTransformers'

Expected behavior :

ts-lint warns when unrecognized option is entered in options

[GeeWee]

I think this is a good idea. We might have to throw errors instead of warnings though. @huafu do you know if Jest still ignores what we log to the console?

[ahnpnl]

hi @kcebula , feel free to submit a PR to help us to improve this.