fix(builder): watch store dir and serverMiddleware paths

[Atinux]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)

Description

Problems

Right now, when we use serverMiddleware and change them (the files linked to options.serverMiddleware), a restart happen but the file is cached, leading to a useless restart.

The other problem is when we start a nuxt app without a store/ directory, and while running nuxt dev, when we add the directory with a file in it (store/index.js), Nuxt does nothing and we have to manually restart the project (really annoying).

Solution

• Watch paths of serverMiddleware + clear cache of the file

• Watch store/ directory for full reload when this.options.store === false
  

Checklist:

• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #5681 into dev will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #5681      +/-   ##
==========================================
+ Coverage   95.57%   95.59%   +0.01%     
==========================================
  Files          81       81              
  Lines        2645     2656      +11     
  Branches      673      679       +6     
==========================================
+ Hits         2528     2539      +11     
  Misses         98       98              
  Partials       19       19

Impacted Files	Coverage Δ
packages/builder/src/builder.js	100% <100%> (ø)	⬆️
packages/utils/src/lang.js	100% <100%> (ø)	⬆️
packages/cli/src/commands/dev.js	85.18% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8588ca9...470dda0. Read the comment docs.