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@newrelic/ritm
Advanced tools
Changelog
v7.2.0
new Hook(null, onrequire)
, by caching exports
in more cases. Contributed by @nwalters512.
(https://github.com/elastic/require-in-the-middle/issues/75)Readme
Hook into the Node.js require
function. This allows you to modify
modules on-the-fly as they are being required.
npm install @newrelic/ritm --save
const path = require('path')
const { Hook } = require('@newrelic/ritm')
// Hook into the express and mongodb module
new Hook(['express', 'mongodb'], function (exports, name, basedir) {
const version = require(path.join(basedir, 'package.json')).version
console.log('loading %s@%s', name, version)
// expose the module version as a property on its exports object
exports._version = version
// whatever you return will be returned by `require`
return exports
})
The @newrelic/ritm
module exposes a single function:
hook = new Hook([modules][, options], onrequire)
When called a hook
object is returned.
Arguments:
modules
<string[]> An optional array of module names to limit which modules
trigger a call of the onrequire
callback. If specified, this must be the
first argument. Both regular modules (e.g. react-dom
) and
sub-modules (e.g. react-dom/server
) can be specified in the array.options
<Object> An optional object containing fields that change when the
onrequire
callback is called. If specified, this must be the second
argument.
options.internals
<boolean> Specifies whether onrequire
should be called
when module-internal files are loaded; defaults to false
.onrequire
<Function> The function to call when a module is required.The onrequire
callback will be called the first time a module is
required. The function is called with three arguments:
exports
<Object> The value of the module.exports
property that would
normally be exposed by the required module.name
<string> The name of the module being required. If options.internals
was set to true
, the path of module-internal files that are loaded
(relative to basedir
) will be appended to the module name, separated by
path.sep
.basedir
<string> The directory where the module is located, or undefined
for core modules.Return the value you want the module to expose (normally the exports
argument).
hook.unhook()
Removes the onrequire
callback so that it will not be triggerd by
subsequent calls to require()
.
FAQs
Module to hook into the Node.js require function
We found that @newrelic/ritm demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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