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## Types of changes
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## Description
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## Checklist:
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## 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.
* feat: add tests to check for changed files
Make sure that if we are building or generating only files in buildDir and generate.dir are changed. If files in another location would also be changed due to a new config option, those locations should be guarded in lib/common/options so you cant set them lower then rootDir or srcDir.
* fix running tests inBand
use simpler path comparisons
* add debug logs for ci
use process.hrtime for waitFor test
* add debug logs for ci
use process.hrtime for waitFor test
* use writeFileSync should probably help
* use forEach instead of map when not returning a value
update waitFor test to compare values with jest
* fix appeveyor
* use lower limit than delay in waitFor test
revert isAppveyor export
The SPA fallback option should always be a string, if the user configuration was specifed as boolean true it should have been replaced by the default string value (currently 404.html) in lib/common/options.js
Added test on empty string
Added missing test for spa-fallback.html
