require-hook - A node.js library that allows you to hook 'require', gather data about calls to 'require' and intercept/modify the results

• Features
• Getting started
• What is collected?
• API
• License
• Changelog
• Third-party libraries

Features

• Hook 'require' of node.js.
• Can gather data of 'require' calls.
• Can call an event handler on each 'require' call to possibly intercept and change the data.

Getting started

$ npm install require-hook

In your project:

var path = require("path");
var require-hook = require("require-hook");

require-hook.attach(path.resolve());
...
var result = require-hook.getData();

What is collected

require-hook will gather an array of data, each element will have the following properties

{
  require: This is the path sent to the require function
  callingFile: This is the file that the require was called from
  native: boolean indicating whether or not the required library is one of the built in native modules
  json: boolean indicating whether or not the required file was json or js
  absPath: the absolute path to the required file [this will only be defined if the required is not thirdParty]
  absPathResolvedCorrectly: if the absolute path required was resolved correctly and found [this will only be defined if the required is not thirdParty]
  testOnly: boolean indicating whether or not the required file was (most probably) for the usage or unit tests only
  thirdParty: boolean indicating whether the required file was for a library or a file
  localToProject: boolean indicating whether the require was called within the boundaries of the project involved
}

API

• config
• attach
• detach
• setEvent
• getData
• getData_localToProject
• getData_thirdParty
• getData_localThirdParty
• filterData

This is the configuration object, the same object that gets loaded from config.js file.

Properties

• testOnlySubPath - An array of substrings that identify code loaded from test related sub folders.
• alternateProjectPaths - Pass alternate projects path to identify as "localToProject"

Hook the require functionality.

Arguments

• projectPath - Target project's path

Example

var path = require("path");
require-hook.attach(path.resolve());

Remove the hook.

Set an optional event handler which will be called on each "require" call.

Arguments

• event_handler - A function that will receive two parameters: result, e.
• event_handler(result, e) - The event handler that will be called on each "require". The event handler is passed a result, the result of the require (what is exposed through module.exports). e is the information describing the require.

Returns the collected data as an array.

Returns the collected data as an array, filtered with localToProject flag only.

Returns the collected data as an array, filtered with thirdParty (non-native) flag only.

Returns the collected data as an array, filtered with localToProject and thirdParty flags only. This is useful when used with the config option alternateProjectPaths

Returns the collected data as an array, filtered with the given filter set.

Arguments

• filter - An object with flags to filter

Example

var result = require-hook.filterData({native: false, localToProject: true, thirdParty: true});

var result = require-hook.filterData({native: false, thirdParty: true});

License

require-hook is licensed under the MIT License

Changelog

• 0.1.2: minor changes

• 0.1.1: License change to MIT

• 0.1.0: Initial version

Third-party libraries

The following third-party libraries are used:

• lodash: https://lodash.com/