* feat: modern build
* refactor: use single module import for lodash
* refactor: add credit comment for modern plugin
* feat: ssr modern build
* fix: not null check for request
* fix: not null check for request.headers
* feat: add modern argument on build command
* refactor: simpilfy filenames for modern
* refactor: use packages/webpack src instead of dist in test
* test: add feature test for modern build
<!--- Provide a general summary of your changes in the title above -->
## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
- [ ] Bug fix (a non-breaking change which fixes an issue)
- [ ] New feature (a non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
## Description
<!--- Describe your changes in detail -->
<!--- Why is this change required? What problem does it solve? -->
<!--- If it resolves an open issue, please link to the issue here. For example "Resolves: #1337" -->
## Checklist:
<!--- Put an `x` in all the boxes that apply. -->
<!--- If your change requires a documentation PR, please link it appropriately -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly. (PR: #)
- [ ] I have added tests to cover my changes (if not applicable, please state why)
- [ ] All new and existing tests are passing.
## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
- [ ] Bug fix (a non-breaking change which fixes an issue)
- [x] New feature (a non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
## Description
Resolves#3920 by adding a warning during the build process and a small disclaimer into the default page component.
## Checklist:
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly. (PR: #)
- [x] I have added tests to cover my changes (if not applicable, please state why)
- [x] All new and existing tests are passing.
* fix: appveyor test failure
* ci: bring back yarn cache
* ci: turn off matrix
* refactor: use babel instead of esm in jest
* refactor: use es modules in fixtures
* feat: support `server` option in `nuxt.config.js` to set PORT and HOST
* lint
* change the conifg priority to `argv > nuxt.config.js > env.NUXT_PORT > env.PORT > package.json > default`
* check for `options.server`
