DevTools failed to load SourceMap

Working project, shows blank screen. where to look for debug ? :hammer_and_wrench:

in your build/webpack.config.js file try setting your devtool to ‘source-map’

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It works, but why? that was the official default config

devtool: 'source-map',
// devtool: env === 'production' ? 'source-map' : 'eval',