@commonshost/sherlock 🕵

Dependency tracing tool for HTML, CSS, and JS files. This can be used with HTTP/2 Server Push to serve websites faster.

Usage

Provide a directory path to the folder that includes HTML, CSS, and JS files.

Sherlock returns a Promise which resolves with an array of errors and dependency objects.

Each dependency object has the properties type, parent, and path.

Image dependencies may include the loading property, if set in the HTML source.

Each error object has the properties error and parent.

const sherlock = require('@commonshost/sherlock')

const dependencies = await sherlock(dir)
// [
//   {
//     type: 'application/javascript',
//     parent: '/public/app.js',
//     path:'/public/src/lib.js'
//   },
//   ...
// ]

error

An Error instance containing some information about the problem.

Example:

SyntaxError from Acorn with pos and loc properties and a meaningful message string.

type

A string containing the MIME type of the dependency. Can be a specific MIME type of a wildcard.

Examples:

• application/javascript
• image/png
• image/*
• font/*
• text/css

parent

A string containing the absolute path to the file referencing the dependency.

Examples:

• /some/where/index.html
• /some/where/app.js
• /some/where/styles.css

path

A string containing the absolute path to the referenced file, or external URL. Includes any query string (i.e. ?query) or hash fragment (i.e. #hash).

Examples:

• /some/where/images/photo.jpeg
• /some/where/assets/typeface.woff2
• /some/where/assets/typeface.woff2?query-string
• /some/where/assets/typeface.woff2#hash-fragment
• https://example.net/external-resource

loading

A string containing the value of the loading HTML attribute. Should be either lazy or eager, but the actual HTML value is provided even if it differs so the robustness principle applies.

See Also

• HTTP/2 Server Push Manifest

Colophon

Made with ❤️ by Sophie Yang and Sebastiaan Deckers for the 🐑 Commons Host project.