Check for Node’s fs and path before trying to use them#339

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GeoffreyBooth wants to merge 3 commits into

zaach:masterfrom

GeoffreyBooth:fix-commonjs-detection

Commits on Jan 21, 2017

Improve test for CommonJS environment, to not be fooled by a browser environment that happens to have `require` and `exports` defined as globals
GeoffreyBooth
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Actually, rather than test for Node, let’s specifically check that require(‘fs’) returns something before we try to use it
GeoffreyBooth
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Commits on Jan 22, 2017

Set the fallback value of source to an empty string, which is parseable, instead of null, which is not.
GeoffreyBooth
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