4   var maps = {};
7     all: all.bind(null, maps),
8     isTracking: isTracking.bind(null, maps),
9     originalPositionFor: originalPositionFor.bind(null, maps),
10     track: track.bind(null, maps)
14 function all(maps) {  argument
15   return maps;
18 function isTracking(maps, source) {  argument
19   return source in maps;
22 function originalPositionFor(maps, metadata, range, selectorFallbacks) {  argument
34     originalPosition = maps[source].originalPositionFor(position);
42     return originalPositionFor(maps, [line - 1, column, source], range, selectorFallbacks - 1);
54 function track(maps, source, data) {  argument
55   maps[source] = new SourceMapConsumer(data);