A very fast standards-compliant ES2015 Promise library for node.
There are several fast promise implementations out there, like
bluebird, but they all add a bunch of stuff that's not in the
ES2015 Promise spec. Further, as they've added more and more
features they've grown so complex that they can't be easily audited
against the ES2015 spec (or the official
test262 test suite).
babybird library is a stripped-down "just ES2015" Promise
implementation, which passes the Promises/A+ and
suites. It is very competitive with the performance of
without having to give us standards compliance. On the doxbee
benchmark running under node 5.1.0,
babybird is 2.4 times faster
than native Promises, 4 times faster than the Promise implementation
core-js, and almost 9 times faster than the Promise
es6-shim. The performance improvement is even
greater when running under node 0.10.
babybird supports subclassing (as all ES2015 Promise
implementations ought). This means that if you'd like additional
bells and whistles on your Promises, you can add then via subclassing
and without stomping on the global Promise. In fact, the
library provides much the same feature set as
bluebird, but with a
clean separation of concerns. Further,
prfun runs on top of any
ES2015-compliant Promise implementation, so if
babybird is someday
supplanted, you can just swap out the core Promise implementation
prfun without having to update any of your uses of the
core ES2015 or extended
npm install babybird
var Promise = ;
babybird library plays very nicely with
prfun, if you'd like
a few bells and whistles with your library. I recommend creating a
new module, named (say)
promise.js, with the contents:
moduleexports = ;
and then using the wrapped promises this way:
var Promise = ;
These benchmarks are derived from the benchmarks included with
bluebird. A few of the bluebird test cases have been forked to
add "fair" versions, since bluebird obtained some of its speed by
using a faster
promisify method than that provided to other
promise implementations, and by using a few
APIs which appeared to be tuned for the benchmark.
You can reproduce these results using
npm run bench.
results for 20000 parallel executions, 1 ms per I/O op file time(ms) slowdown memory(MB) callbacks-baseline.js 819 0.48 32.99 promises-bluebird.js 1383 0.81 50.59 promises-bluebird-fair.js 1715 1.00 39.02 promises-cscott-babybird-noall.js 1870 1.09 41.19 promises-cscott-babybird.js 1925 1.12 61.81 promises-cscott-babybird-prfun.js 1991 1.16 48.60 promises-then-promise-es6.js 3084 1.80 64.54 promises-then-promise.js 3112 1.81 64.39 promises-paulmillr-es6shim.js 12475 7.27 94.20 promises-zloirock-corejs.js 18695 10.90 94.11 Platform info: Linux 4.2.0-1-amd64 ia32 Node.JS 0.10.40 V8 184.108.40.206 Intel(R) Core(TM) i7 CPU L 640 @ 2.13GHz × 4
results for 20000 parallel executions, 1 ms per I/O op file time(ms) slowdown memory(MB) callbacks-baseline.js 826 0.53 29.29 promises-bluebird-generator.js 1105 0.71 25.49 promises-bluebird-generator-fair.js 1113 0.72 28.27 promises-cscott-babybird-prfun-generator.js 1202 0.77 33.68 promises-bluebird-fair.js 1553 1.00 51.38 promises-cscott-babybird-noall.js 1623 1.05 65.25 promises-bluebird.js 1643 1.06 43.66 promises-cscott-babybird-prfun.js 1707 1.10 72.33 promises-cscott-babybird.js 1724 1.11 72.82 promises-then-promise-es6.js 2985 1.92 106.96 promises-then-promise.js 3004 1.93 106.69 promises-ecmascript6-native.js 3770 2.43 176.96 promises-zloirock-corejs.js 6298 4.06 155.89 promises-paulmillr-es6shim.js 13892 8.95 227.61 Platform info: Linux 4.2.0-1-amd64 ia32 Node.JS 5.1.0 V8 220.127.116.11 Intel(R) Core(TM) i7 CPU L 640 @ 2.13GHz × 4
Copyright (c) 2015 C. Scott Ananian
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