fix: sourcemap

[cap-Bernardito]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

fixes #287 fixes #288

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #290 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #290   +/-   ##
=======================================
  Coverage   95.92%   95.92%           
=======================================
  Files           3        3           
  Lines         319      319           
  Branches      103      103           
=======================================
  Hits          306      306           
  Misses         12       12           
  Partials        1        1           

Impacted Files	Coverage Δ
src/index.js	94.59% <100.00%> (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 7d65853...ca51c00. Read the comment docs.