funcunit/site/node_modules/transpile/lib/source_map_filename.js

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var path = require("path");
var urix = require("urix");

module.exports = sourceMapFileName;

function sourceMapFileName(load, options){
	var baseURL = options.baseURL || process.cwd();
	var address = load.address.replace("file:", "");
	var sourcePath = path.relative(baseURL, address);
	return urix(sourcePath);
}