lib/stringify/source-map-support.js
function mixin(compiler) {
  compiler._comment = compiler.comment;
  compiler.map = new SourceMap();
  compiler.position = { line: 1, column: 1 };
  compiler.files = {};
  for (var k in exports) compiler[k] = exports[k];
}
function mixin(compiler) {
  compiler._comment = compiler.comment;
  compiler.map = new SourceMap();
  compiler.position = { line: 1, column: 1 };
  compiler.files = {};
  for (var k in exports) compiler[k] = exports[k];
}
function mixin ( compiler ) { compiler . _comment = compiler . comment ; compiler . map = new SourceMap ( ) ; compiler . position = { line : 1 , column : 1 } ; compiler . files = { } ; for ( var k in exports ) compiler [ k ] = exports [ k ] ; }
Mixin source map support into `compiler`.

@param {Compiler} compiler
@api public
Mixin source map support into compiler .