fork.js: Reject child-process completion promise with an error. #200
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It is generally recommended to reject Promises with an error.
This becomes especially true with the move to
async/await
,as
Promise.reject(1)
essentially becomesthrow 1
in that context.Not doing so was causing a weird bug on Node 0.10.
Ref: https://travis-ci.org/sindresorhus/ava/jobs/90709377#L779