browser field spec for package.json

browser.md

The spec has moved to a repo: https://github.com/defunctzombie/package-browser-field-spec to facilitate collaboration.

Nice! I'd love to see this spec implemented in all bundlers 😄

Added to "Complementary Resources" section of "Front-End Package Manager Comparison":
http://git.io/_ZWfVA#complementary-resources

How would a module author provide the following:

• themod.js (authored directly, CJS style)
• themod-amd.js (generated at publish time)

Given a package.json that had a browser field, should the module author even attempt to provide both files? Should the author specify transforms, and rely on the consumer using a tool the author specified a transform for? It would be nice if the consumer could use the same identifier in both scenarios.

It is not completely related to this, but i want to extend the concept of client side (only) libraries npm. Imo the problem of client side dependencies with js, css, etc. is still not solved yet. There are tools for some parts of it but no common specification or configuration etc. What about other client side assets like css, less or images? At the moment thats completely missing in my opinion.

There is already the directories property in the CommonJS spec, but it is missing keys for static assets like css, less, images, etc. (http://wiki.commonjs.org/wiki/Packages/1.0#Optional_Fields and https://www.npmjs.org/doc/files/package.json.html#directories)

There are tons of great client side libraries on npm but every single one is different to use / consume in the frontend when it comes to css, less, sass, images, fonts, etc. How to include them? What files should be included? In which order? It would be great if package maintainers could clearly describe what additional assets, besides javascript are shipped with the npm package and how to consume them.

Lets take bootstrap as an example (original https://github.com/twbs/bootstrap/blob/master/package.json)
Why not?

{
  "name": "bootstrap",
  "description": "The most popular front-end framework for developing responsive, mobile first projects on the web.",
  "version": "3.3.0",
  "homepage": "http://getbootstrap.com",
  "author": "Twitter, Inc.",
  "scripts": {
    "test": "grunt test"
  },
  "directories": {
    "assets": {
       "css": ["dist/css/bootstrap.min.css","dist/css/bootstrap-theme.min.css"],
       "js":["dist/js/bootstrap.min.js"]
       "font":["dist/fonts/glyphicons-halflings-regular.eot","dist/fonts/glyphicons-halflings-regular.eot","dist/fonts/glyphicons-halflings-regular.svg","dist/fonts/glyphicons-halflings-regular.ttf", "dist/fonts/glyphicons-halflings-regular.woff"]
    }
  },
  "main": "./dist/js/npm",
  "repository": {
    "type": "git",
    "url": "https://github.com/twbs/bootstrap.git"
  },
  "bugs": {
    "url": "https://github.com/twbs/bootstrap/issues"
  },
  "license": {
    "type": "MIT",
    "url": "https://github.com/twbs/bootstrap/blob/master/LICENSE"
  },

  "jspm": {
    "main": "js/bootstrap",
    "directories": {
      "example": "examples",
      "lib": "dist"
    },
    "shim": {
      "js/bootstrap": {
        "imports": "jquery",
        "exports": "$"
      }
    },
    "buildConfig": {
      "uglify": true
    }
  }
}

This could be even further extended to configure which assets are already "compiled", minified or packaged for usage or which assets are optional (bootstrap-theme.min.css).

Here are some very popular packages with js, css and/or other assets on npm without any further configuration:

• https://github.com/angular-ui/bootstrap/blob/master/package.json
• https://github.com/angular/angular.js/blob/master/package.json
• https://github.com/jquery/jquery/blob/master/package.json
• https://github.com/ivaynberg/select2/blob/master/package.json
• https://github.com/jquery/jquery-ui/blob/master/package.json
• https://github.com/DataTables/DataTables/blob/master/package.json
• https://github.com/ExactTarget/fuelux/blob/master/package.json
• https://github.com/react-bootstrap/react-bootstrap/blob/master/package.json
• https://github.com/facebook/react/blob/master/package.json

Package Managers like bower, component, npm or other tools like browserify, etc. could use this information only or in addition to their separate configuration files.

What do you think?
cheers

It would be great if we could expand this spec with subarg syntax:
browserify/browserify#1046

So this currently doesn't exist in Webpack?

Nice spec.

When you write:

"browser": {
    "module-a": false,
    "./server/only.js": "./shims/server-only.js"
}

Are the relative paths in "./server/only.js": "./shims/server-only.js" relative to the location of the package.json file or to the directory of the file that calls require('./server/only.js')?

In other words, lets say root stands for the directory where the package.json is located and root/deep/file.js does require('./server/only.js'), should it resolve to:

• root/deep/shims/server-only.js
• or to root/shims/server-only.js?

A regex option would be cool, so you don't have to explicitly define each module of type to be false.

Hey @defunctzombie would it make sense to PR this into https://github.com/npm/npm/edit/master/doc/files/package.json.md ?

Is this added to anything besides browserify? Would be cool to see support in webpack and jspm.

Verified this works in webpack. The property is overloaded so you sometimes have to get creative if you have a client-only entry point and want to specify a module location.

"main": "index.js",
"browser": {
  "index.js": "bytebuffer/dist/ByteBufferAB.js",
  "Long": "bytebuffer/node_modules/long/dist/Long.js"
}

The index.js mapping is equivalent to "browser": "dist/ByteBufferAB.js"

@balupton It's already supported in JSPM: jspm/jspm-cli#1062

This use of the browser property seems to be at odds with the npm specification? It seems dangerous to me and has already caused problems with the Axios package.

https://docs.npmjs.com/cli/v7/configuring-npm/package-json#browser

It’s not at odds with it at all; they should be used in concert.

Sorry, not quite getting that. The npm docs appear to say that the browser property should contain a single string pointing to the main entry point for when the package is consumed by a browser. But this spec is using an object with a different meaning? How can that not be at odds? Am I missing something?

Having two wildly different specs on the same property makes it very much harder to use the property for anything unless you already know how a package is going to use it. Not much help when you are trying to automate things.

Both are part of the browser field spec (the npm docs are not an authority on this subject). if a string, it replaces the “main”; if an object, it provides mappings to replace anything.

OK, can you please point me to the authoritative definition for the package.json file? Thanks.

There is not one such definition, since many tools look at that file. For npm, it's https://docs.npmjs.com/cli/v7/configuring-npm/package-json/; for the "browser" field, it's https://github.com/defunctzombie/package-browser-field-spec.

Hmm, an interesting viewpoint. Not one I share I'm afraid. I see that we won't agree on this subject sadly. Having two different definitions for this field is confusing and counter-productive. As far as I am aware, npm created the package.json file and defined its schema including the browser property. If more flexibility was needed for that field, it should have been (and maybe was for all I know) raised with npm. What we have now is some scripts failing because of competing specifications for the field. Adding complexity and wasting people's time while they try to work out what is wrong.

Anyway, thanks for responding.

You’re incorrect; npm did not create or define the browser field, they merely (partially) document it. If it’s confusing for you, I’m sure we could get npm to remove that, or link to the actual spec for it.

If that is the case then it would indeed be better for the npm documentation to be updated so that it is correct.