fix: generate source maps using sass with asset/resource

[cap-Bernardito]

This PR contains a:

• [x] bugfix
• [ ] new feature
• [ ] code refactor
• [x] test update
• [ ] typo fix
• [x] metadata update

Motivation / Use-Case

Fixed #962

Breaking Changes

No

Additional Info

No

[codecov[bot]]

Codecov Report

Merging #968 (ed4556b) into master (1b453fb) will increase coverage by 0.04%. The diff coverage is 97.05%.

@@            Coverage Diff             @@
##           master     #968      +/-   ##
==========================================
+ Coverage   96.12%   96.16%   +0.04%     
==========================================
  Files           4        4              
  Lines         258      287      +29     
  Branches       83       99      +16     
==========================================
+ Hits          248      276      +28     
- Misses          9       10       +1     
  Partials        1        1              

Impacted Files	Coverage Δ
src/index.js	97.43% <92.30%> (-2.57%)	:arrow_down:
src/utils.js	95.76% <100.00%> (+0.39%)	:arrow_up:

---

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 1b453fb...ed4556b. Read the comment docs.