Is basically a file that only supports //-lines, no source. You add the source by using a //SOURCES line.

It's just a very basic implementation right now. There's no validation yet, so you could for example create a build.jbang file without a //SOURCES line and that would probably fail horribly.

Codecov Report

Merging #1384 (8b4ef83) into main (9faf9f8) will decrease coverage by 57.29%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main   #1384       +/-   ##
============================================
- Coverage     57.29%   0.00%   -57.30%     
============================================
  Files           104     105        +1     
  Lines          6323    6370       +47     
  Branches       1036    1042        +6     
============================================
- Hits           3623       0     -3623     
- Misses         2215    6370     +4155     
+ Partials        485       0      -485     

Flag	Coverage Δ
Linux	0.00% <0.00%> (-56.12%)	:arrow_down:
Windows	0.00% <0.00%> (-56.70%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/main/java/dev/jbang/cli/Alias.java	0.00% <0.00%> (-50.43%)	:arrow_down:
src/main/java/dev/jbang/cli/App.java	0.00% <0.00%> (-52.55%)	:arrow_down:
src/main/java/dev/jbang/cli/Build.java	0.00% <0.00%> (-100.00%)	:arrow_down:
src/main/java/dev/jbang/cli/Edit.java	0.00% <0.00%> (-44.13%)	:arrow_down:
src/main/java/dev/jbang/cli/Export.java	0.00% <0.00%> (-64.34%)	:arrow_down:
src/main/java/dev/jbang/cli/Info.java	0.00% <0.00%> (-60.47%)	:arrow_down:
src/main/java/dev/jbang/cli/JBang.java	0.00% <0.00%> (-61.49%)	:arrow_down:
src/main/java/dev/jbang/cli/Run.java	0.00% <0.00%> (-66.67%)	:arrow_down:
src/main/java/dev/jbang/source/Code.java	0.00% <ø> (-71.43%)	:arrow_down:
src/main/java/dev/jbang/source/Jar.java	0.00% <0.00%> (-72.55%)	:arrow_down:
... and 105 more

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should we make this feature enabled only when --preview specified as we discussed?

especially since the format of build.jbang most likely isn't going to stay at being // based.

should we make this feature enabled only when --preview specified as we discussed?

Sure, that's okay with me.

Ok, will merge this as-is and any improvements/refactorings will be made in future PRs.