sindresorhus/gulp-esnext — pull request #2 by ckknight (2014-06-18 22:55:43+00:00)
Title: add option sourceMap: true and properly JSON.stringify map file. 0.2.1

The user cannot realistically define sourceFileName and sourceMapName on their own, as it is on a per-file basis, which doesn't fit cleanly into the gulp way of doing things. This patch solves that issue by providing the capability to use `sourceMap: true` which appends the base64'd source map to the bottom of each output JS file.