bare-module

Module support for JavaScript.

npm i bare-module

Usage

const Module = require('bare-module')

Packages

A package is directory with a package.json file.

Fields

"name"

{
  "name": "my-package"
}

The name of the package. This is used for addon resolution, self-referencing, and importing packages by name.

"version"

{
  "version": "1.2.3"
}

The current version of the package. This is used for addon resolution.

"type"

{
  "type": "module"
}

The module format used for .js files. If not defined, .js files are interpreted as CommonJS. If set to "module", .js files are instead interpreted as ES modules.

"exports"

{
  "exports": {
    ".": "./index.js"
  }
}

The entry points of the package. If defined, only the modules explicitly exported by the package may be imported when importing the package by name.

Subpath exports

A package may define more than one entry point by declaring several subpaths with the main export being ".":

{
  "exports": {
    ".": "./index.js",
    "./submodule": "./lib/submodule.js"
  }
}

When importing the package by name, require('my-package') will resolve to <modules>/my-package/index.js whereas require('my-package/submodule') will resolve to <modules>/my-package/lib/submodule.js.

Conditional exports

Conditional exports allow packages to provide different exports for different conditions, such as the module format of the importing module:

{
  "exports": {
    ".": {
      "import": "./index.mjs",
      "require": "./index.cjs"
    }
  }
}

When importing the package by name, require('my-package') will resolve to <modules>/my-package/index.cjs whereas import 'my-package' will resolve to <modules>/my-package/index.mjs.

Similarly, conditional exports can be used to provide different entry points for different runtimes:

{
  "exports": {
    ".": {
      "bare": "./bare.js",
      "node": "./node.js"
    }
  }
}

To provide a fallback for when no other conditions match, the "default" condition can be declared:

{
  "exports": {
    ".": {
      "bare": "./bare.js",
      "node": "./node.js",
      "default": "./fallback.js"
    }
  }
}

The following conditions are supported, listed in order from most specific to least specific as conditions should be defined:

Condition	Description
"bare"
"node"
"import"
"require"
"default"

Self-referencing

Within a package, exports defined in the "exports" field can be referenced by importing the package by name. For example, given the following package.json...

{
  "name": "my-package",
  "exports": {
    ".": "./index.js",
    "./submodule": "./lib/submodule.js"
  }
}

...any module within my-package may reference these entry points using either require('my-package') or require('my-package/submodule').

Exports sugar

If a package defines only a single export, ".", it may leave out the subpath entirely:

{
  "exports": "./index.js"
}

"imports"

Subpath imports

Conditional imports

Private imports

"engines"

{
  "engines": {
    "bare": ">=1.0.5"
  }
}

The engine requirements of the package. During module resolution, the versions declared by Bare.versions will be tested against the requirements declared by the package and resolution fail if they're not satisfied.

API

Module.constants

Module.constants.states

Constant	Description
EVALUATED
SYNTHESIZED
DESTROYED

Module.constants.types

Constant	Description
SCRIPT
MODULE
JSON
BUNDLE
ADDON

Module.cache

const url = Module.resolve(specifier, parentURL[, options])

Options include:

{
  referrer = null,
  protocol,
  imports,
  resolutions,
  builtins,
  conditions
}

const module = Module.load(url[, source][, options])

Options include:

{
  referrer = null,
  type,
  defaultType = constants.types.SCRIPT,
  cache,
  main,
  protocol,
  imports,
  resolutions,
  builtins,
  conditions
}

module.url

module.filename

module.dirname

module.type

module.defaultType

module.cache

module.main

module.exports

module.imports

module.resolutions

module.builtins

module.conditions

module.protocol

module.destroy()

Custom require()

const require = Module.createRequire(parentURL[, options])

Options include:

{
  referrer = null,
  type = constants.types.SCRIPT,
  defaultType = constants.types.SCRIPT,
  cache,
  main,
  protocol,
  imports,
  resolutions,
  builtins,
  conditions
}

Protocols

const protocol = new Module.Protocol(options)

Options include:

{
  preresolve,
  postresolve,
  resolve,
  exists,
  read,
  load
}

Bundles

const bundle = new Module.Bundle()

See https://github.com/holepunchto/bare-bundle.

License

Apache-2.0