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Who's there?
The modules that just called your code.

KnockKnock provides information about the files, functions, and packages that were responsible for calling your module.

• Install
• API
• Bugs
• Contributors
• License

Install

$ npm install --save knockknock

You'll need to have at least Node.js 4 or newer.

API

knockknock([options])

Finds all of the available information about the callers asynchronously, returning a Promise to retrieve them. The information for each caller is provided in a format similar to below:

{
  // The column number within the file responsible for calling your module.
  column: 10,
  // The file that called your module
  file: '/path/to/my-example-package/node_modules/example-server/src/start.js',
  // The line number within the file responsible for calling your module
  line: 123,
  // The name of the function within the file responsible for calling your module (or "<anonymous>" where appropriate)
  name: 'startServer',
  // The information for the package containing the file or null if none could be found
  package: {
    // The directory of the package
    directory: '/path/to/my-example-package/node_modules/example-server',
    // The file path of the "main" file for the package or null if it has none
    main: '/path/to/my-example-package/node_modules/example-server/server.js',
    // The name of the package
    name: 'example-server',
    // The version of the package
    version: '3.2.1'
  }
}

The options parameter is entirely optional and supports the following:

Option	Description	Default Value
excludes	The name(s) of packages whose calls should be ignored. Internal calls from KnockKnock and Node.js are always ignored.	[]
filterFiles	A function called to filter files based on their path. Only called for files whose containing package (if any) is also included.	N/A
filterPackages	A function called to filter files based on the package to which they belong (if any). Only called if package is not listed in excludes.	N/A
limit	The maximum number of callers to be included in the results. No limit is applied when null.	null
offset	The number of frames from call stack to be skipped initially.	0

In most cases, you may want to at least exclude your own package so that your own package-internal calls are ignored via excludes or filterPackages.

const whoIsThere = require('knockknock');

module.exports = function() {
  return whoIsThere({ excludes: 'my-example-package' })
    .then((callers) => {
      if (callers.length > 0) {
        console.log(`Called from ${callers.length} modules`);

        // ...
      } else {
        console.log('Called from unknown module');

        // ...
      }
    });
};

The limit option works great if you only want to know about the last caller:

const whoIsThere = require('knockknock');

module.exports = function() {
  return whoIsThere({ excludes: 'my-example-package', limit: 1 })
    .then((callers) => {
      if (callers.length === 1) {
        console.log(`Called from module "${callers[0].file}" in package "${callers[0].package ? callers[0].package.name : '<unknown>'}"`);

        // ...
      } else {
        console.log('Called from unknown module');

        // ...
      }
    });
};

knockknock.sync([options])

A synchronous alternative to knockknock([options]).

const whoIsThere = require('knockknock');

module.exports = function() {
  const callers = whoIsThere.sync({ excludes: 'my-example-package' });

  if (callers.length > 0) {
    console.log(`Called from ${callers.length} modules`);

    // ...
  } else {
    console.log('Called from unknown module');

    // ...
  }
};

knockknock.version

The current version of KnockKnock.

const whoIsThere = require('knockknock');

whoIsThere.version;
=> "0.3.0"

Bugs

If you have any problems with KnockKnock or would like to see changes currently in development you can do so here.

Contributors

If you want to contribute, you're a legend! Information on how you can do so can be found in CONTRIBUTING.md. We want your suggestions and pull requests!

A list of KnockKnock contributors can be found in AUTHORS.md.

License

See LICENSE.md for more information on our MIT license.