Parcel Plugin Web Extension 2

This parcel plugin enables you to use a WebExtension manifest.json as an entry point. For more information about manifest.json, please refer to the MDN docs.

Please note that this package is a fork from parcel-plugin-web-extension

Main difference:
The concept of manifest overrides was abandoned in favor of the concept of dynamic manifest (see below).

Installation

Install via npm:

npm install --save-dev parcel-plugin-web-extension-2

or via yarn:

yarn add -D parcel-plugin-web-extension-2

Usage

Quick Start

After installing this plugin, use manifest.json as your entry point, like so:

parcel src/manifest.json

Your assets will now be resolved from the contents of your manifest file.

Assets resolved by this plugin:

• background.scripts
• background.page
• content_scripts
• browser_action.default_popup
• browser_action.default_icon
• page_action.default_popup
• page_action.default_icon
• icons
• web_accessible_resources
• chrome_url_overrides.bookmarks
• chrome_url_overrides.newtab
• chrome_url_overrides.history

Dynamic Manifest

It is possible to generate a manifest that depends of:

• the environment (development / production)
• the targeted browser
• the version
• etc...

Example

Given this manifest.json:

{
    "manifest_version": 2,
    "name": "Example",
    "version": {
        "$replaceByVariable": "npm_package_version"
    },
    "permissions": [
        "storage",
        {
            "$keepIf": "NODE_ENV is development",
            "$replaceByValue": "https://localhost/*"
        },
        {
            "$keepIf": "NODE_ENV is production",
            "$replaceByValue": "https://example.com/*"
        }
    ],
    "applications": {
        "$keepIf": "VENDOR is firefox",
        "gecko": {
            "id": "[email protected]"
        }
    }
}

If you execute this command,

VENDOR=firefox parcel src/manifest.json

...you will get this generated manifest:

{
    "manifest_version": 2,
    "name": "Example",
    "version": "1.0.0",
    "permissions": [
        "storage",
		"https://localhost/*"
    ],
    "applications": {
        "gecko": {
            "id": "[email protected]"
        }
    }
}

What happend?

• The manifest version key was replaced by the npm_package_version environment variable. It corresponds to the version stored in your package.json. Here it's 1.0.0.
• The localhost permission was kept but the example.com one was droped because you are in a development environment. Use parcel build to switch to production environment.
• The applications object was kept because we set the VENDOR environment variable to firefox. Please note that unless npm_package_version or NODE_ENV that are automatically set by NPM, the VENDOR environment variable is defined by you. You can use other variables that way if you want.

For more information please see Simple JSON Templater

Licence

Apache 2.0