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Found the answer at https://github.com/vuejs/vue-cli/issues/5014. You need to disable the async
option in https://github.com/TypeStrong/fork-ts-checker-webpack-plugin#options
To do that I created a file vue.config.js
:
module.exports = {
chainWebpack: config => {
config.plugin('fork-ts-checker').tap(options => {
options[0].async = false
return options
})
}
}
Source:stackexchange.com