Specifies if and how to generate source maps.
"none"- No source maps are generated"linked"- A separate*.ext.mapfile is generated alongside each*.extfile. A//# sourceMappingURLcomment is added to the output file to link the two. Requiresoutdirto be set."inline"- an inline source map is appended to the output file."external"- Generate a separate source map file for each input file. No//# sourceMappingURLcomment is added to the output file.
true and false are aliases for "inline" and "none", respectively.