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I have a quite complex build system and I'm trying to create a source map based on specific files. Those files have been concatenated previously and they also have a source map. Now this is the scenario:

Files a, b, and c are concatenated into abc.js, with abc.js.map, then closure-compiled into ABC.js, with ABC.js.map, using "source_map_input" of abc.js.map. Files d, e, and f are concatenated into def.js, with def.js.map, then closure-compiled into DEF.js, with DEF.js.map, using "source_map_input" of def.js.map.

Everything up until now works fine. If I use ABC.js on a website, I can correctly see all the sources of a, b and c.

Now I want to use closure compiler to concat & compile ABC.js and DEF.js, producing a single output sourcemap and source file ABCDEF.js (+.map) using "source_map_input" twice (once for each file of course), providing the source maps ABC.js.map and DEF.js.map. However, this doesn't seem to work at all. The generated map doesn't point to the original files (a, b, c and d, e, f), but to ABC.js.

Is this a bug in closure compiler, or is it simply not possible to provide multiple files with "source_map_input"?

Gernot Raudner
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1 Answers1

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I was able to resolve the issue. The files built by closure compiler don't contain // #sourceMappingURL=.... If I add this line to the end of ABC.js and DEF.js, the source map is correctly resolved back to the individual files.

Gernot Raudner
  • 814
  • 7
  • 21