Problem with sourcemaps

[tonygustafsson]

When I use sourcemaps in less, I get Unexpected token error in source-map-consumer.js:20.

[lukeapage]

Please can you provide more information?

[XhmikosR]

I'm not sure the current code does what it's supposed to...:

            if (sourceMap) {
                var sourceMapURL = sourceMap.getSourceMapURL();
                css += sourceMap.getCSSAppendage();
            }

sourceMapURL is assigned but never used.

[rjgotten]

I'm not sure the current code does what it's supposed to

It doesn't.

There's a lot of needlessly complicated (and partially incomplete!) manual processing where sourcemap JSON is turned back into objects and sources and sourcesContent arrays are being manually merged, when all you need to do is wrap the input map into a SourceMapConsumer and apply that to the source map generator using applySourceMap:

process : function ( css, extra ) {
  var
    options    = this.options,
    sourceMaps = extra.sourceMap,
    inputMap   = sourceMaps && sourceMaps.getExternalSourceMap(),
    output;

  options.processImport = false;

  if ( typeof options.keepSpecialComments === "undefined" ) {
    options.keepSpecialComments = "*";
  }

  if ( typeof options.rebase === "undefined" ) {
    options.rebase = false;
  }

  if ( typeof options.advanced === "undefined" ) {
    options.advanced = false;
  }

  if ( inputMap ) {
    // Strip existing source map URL, or it may end up in sourcesContent.
    css = css.replace( /\/\*\# sourceMappingURL=.*\*\/$/, "" );
  }

  var output = new CleanCSS( options ).minify( css );

  if ( inputMap ) {
    output.sourceMap.applySourceMap(
      new SourceMapConsumer( inputMap ),
      sourceMaps.getOutputFileName() || ""
    );

    sourceMaps.setExternalSourceMap( output.sourceMap.toString());
    output.styles += sourceMaps.getCSSAppendage();
  }

  return output.styles;
}

[XhmikosR]

@rjgotten: please submit a PR and ping me.

[Badestrand]

Any progress? I can't use this plugin as well as it messes with the source map path somehow (Error: ENOENT: no such file or directory, open '[root-dir]/bundle.css.map').