* Per discussion in #3075: if `sourceFiles` is unspecified, but `filename` is, use `filename`; output null instead of an empty string for `sources` or `sourceRoot`
* Update source map tests to reflect that now we return null instead of empty strings; check generated sources array
* Update source map documentation; still leave more obscure options undocumented
* Follow the TypeScript compiler’s example regarding v3SourceMap, but output empty strings instead of made-up filenames
* Have `sources` default to ‘<anonymous>’
- Inline source maps are now shorter by not using pretty-printed JSON.
- `.register()`ed files are now given more information in their inline source
maps: The name and contents of the source file.
- Some code cleanup.
If you decode the inline source map generated (when using `.register()`) for a
file test.coffee with the contents `console.log "it works!"`, here is the
output:
Before:
{
"version": 3,
"file": "",
"sourceRoot": "",
"sources": [
""
],
"names": [],
"mappings": "AAAA;EAAA,OAAO,CAAC,GAAR,CAAY,eAAZ;AAAA"
}
After:
{"version":3,"file":"","sourceRoot":"","sources":["test.coffee"],"names":[],"mappings":"AAAA;EAAA,OAAO,CAAC,GAAR,CAAY,WAAZ;AAAA","sourcesContent":["console.log \"it works!\"\n"]}
Related: #4214.
