Tiny Package Manager for the Web based on the WICG/import-maps spec. No lock-in.

• Depends only on two packages, acorn for AST parsing and node-fetch to request packages.
• Customize to any registry, CDN or filesystems... It's up to you
• Default to Pika and Unpkg registries
• Only retrive ES6 browser compatible assets and modules
• TypeScript definition resolution can be achieve using yarn/npm
• Easy-to-use

1. Install Heritage

yarn add -D @eliaspourquoi/heritage

2. Manage Dependencies, feels like Yarn...

# Add Dependencies
heritage add three three/examples/jsm/loaders/GLTFLoader.js vue@3.0.0-beta.10 react react-dom es-module-shims

# Remove Dependencies
heritage remove vue

# Install Dependencies
heritage       

3. Add the generated import-map.json to your index.html.

<script type="importmap" src="web_modules/import-map.json"></script>

4. Optional. For now you may need to polyfill the WICG/import-maps spec. Here a working example:

heritage add es-module-shims

<script defer src="web_modules/es-module-shims/0.4.6/es-module-shims.js"></script>
<script type="importmap-shim" src="web_modules/import-map.json"></script>
<script type="module-shim">
  import React from "react"; // If you have installed react for example...
</script>

That's all.

Heritage use package.json to register required packages under the webDependencies field, exactly like Snowpack. The lock file is the generated import-map.json used to manage imports by the browser. Default use of the the Pika CDN and fallback to Unpkg if target not found.

To have the command heritage available you need to have yarn binor npm bin in your PATH like so:

export PATH=$(yarn bin):$PATH

Otherwise you need to use this command ./node_modules/.bin/heritage from the root of your package.

Place a heritage.config.js at the root of your project using this API:

module.exports = [{
  registryName<String>,
  entrypoint<Function>: (name: String, target: String, version: String) => String,
  resolveImport<Function>: (importValue: String) => <Object {
    pkgName<String>,
    pkgTarget<String>,
    pkgVersion<String>,
  }>,
  exists<Function>: (name: String, target: String, version: String) => <Boolean>,
  version<Function>: (name: String, target: String, version: String) => <String>,
  source<Function>: (entrypoint: String) => <String>,
 },
 ...
];

You can see the Pika Registry Resolver here https://github.com/nestarz/heritage/blob/master/src/registries/pika.js