Do stuff with Node.js's native JavaScript modules

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1401.1.66 years ago13 years agoMinified + gzip package size for natives in KB


Do stuff with Node.js's native JavaScript modules


Dear Beloved User,
I feel compelled to give you a word of warning if you are considering using this module.
This module lets you do some creative things with the JavaScript code in Node.js. There are some things here that are basically a recipe for memory leaks, or at the very least, being broken with each new release of Node, since none of these API surfaces are "technically" "supported" by the team managing the Node.js project.
This module does not ship a copy of Node's internals. It does its thing by using the exposed source code that lives in Node.js itself. So, running this on different versions of Node.js will produce different results.
When your program is broken by changes to Node's internals, or when Node changes in such a way that this module becomes fundamentally broken, you will likely get little sympathy. Many people in the Node community consider this sort of behavior to be unwise and unseemly, if not outright hostile and morally wrong.
At the very least, you probably just want to run Node with the (undocumented!) --expose-internals flag, rather than go to such lengths.
Don't use unless you know what you're doing, or at least, are ok with the risks. Don't say I didn't warn you.
Eternally Yours in OSS,
Isaac Z. Schlueter


var natives = require('natives')

// get the source code
var fsCode = natives.source('fs')

// get a evaluated copy of the module
var fsCopy = natives.require('fs')

// you can pass in a whitelist to NOT shim certain things
var fsCopyWithNativeStreams = natives.require('fs', ['stream'])

// note that this is not the same as the "real" fs
assert(fsCopy !== require('fs'))

// but it does have all the same entries
fsCopy.readFileSync(__filename, 'utf8') // etc

Another Caveat

You can't use this to override require("buffer") because everything depends on Buffer.isBuffer working properly, so it's important for that one to be given a pass.