fix: Filter empty strings out of list options

[ValeriaVG]

Filters out empty strings from split list env variables, allowing TS_NODE_IGNORE= <...> to be treated as an empty array.

Closes #1301

[cspotcode]

Thanks, where does this split function get used? Is it only used to split environment variables? Just want to be sure we don't break anything else.

Any chance you can tweak the JSDoc comment a bit to describe what it does, or at least explain that it's meant for env var parsing? Looks like it does some whitespace removal too. It might be nice to further clarify its intended usage, now that it's doing even more than a string split.

[ValeriaVG]

@cspotcode Yes, it's imported only in src/index.ts and used only here:

 ignore: split(env.TS_NODE_IGNORE),
 // ...
 ignoreDiagnostics: split(env.TS_NODE_IGNORE_DIAGNOSTICS),

[codecov]

Codecov Report

Merging #1483 (9eb6fe0) into main (6e6bf63) will increase coverage by 0.08%.
The diff coverage is 100.00%.

Impacted Files	Coverage Δ
src/util.ts	93.93% <100.00%> (+3.31%)	⬆️

[cspotcode]

Approved. Pretty sure the test failures are some unrelated test flakiness that I'll address somewhere else.

[cspotcode]

@ValeriaVG thanks again!