Version

3.0.5

Node and OS info

Node 8.12.0 / yarn 1.10.1 / Ubuntu 18.04.1

Steps to reproduce

1. Configure package.json with new command: "watch": "vue-cli-service build --no-clean --watch"
2. Create vue.config.js file and setup the following:

module.exports = { css: { sourceMap: process.env.NODE_ENV !== 'production', }, configureWebpack: config => { config.watchOptions = { aggregateTimeout: 500, ignored: ['node_modules'], }; } }; 

3. Run yarn watch
4. Make a change to any file under node_modules

What is expected?

The watch should not try to build again because files under node_modules should be ignored

What is actually happening?

Another build is running after changing a file under node_modules