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@launchfort/genji

Genji

Compiles .ts/.tsx/.js/.jsx files into a bundle suitable for the browser.

Quick Start

npm install @launchfort/genji -S

To use the API:

import genji from '@launchfort/genji'

genji([ 'src/index.ts' ], 'dest/out.js', {
  minify: true,
  sourceMaps: true,
  standalone: true
})
  .then(() => console.log('done!'))
  .catch(error => console.error(error))

To use the CLI:

{
  "scripts": {
    "build:scripts": "genji -M -S --standalone -O dest/out.js src/index.ts"
  }
}

CLI

Usage: genji [options] file.ts file.js file.jsx file.tsx ...

Options:
--config          Path to JSON config file
--verbose, -V     Determines if elapsed time will be logged          [boolean]
--watch, -W       Watch the entry files for changes [boolean] [default: false]
--minify, -M      Minify the generated bundle       [boolean] [default: false]
--sourcemaps, -S  Generate source maps              [boolean] [default: false]
--outfile, -O     The bundle output file                            [required]
--standalone      Generate a UMD bundle for this export name
--project, -P     The directory containing or path to your tsconfig.json
                                                        [string] [default: "."]
--expose, -E      The exposed module identifiers for each entry file   [array]
--external, -X    External module identfiers to treat as external modules
                                                                        [array]
--help            Show help                                          [boolean]

Example:

node ./node_modules/.bin/genji -M -S -O dest/out.js src/index.jsx

Or in a package.json (installed locally):

{
  "scripts": {
    "build:scripts": "genji -M -S -O dest/out.js src/index.js"
  }
}

If --standalone is truthy then the globally exported UMD module name will be the same as the value of the name field in your ./package.json file.

genji -M -S -O dest/out.js --standalone src/index.jsx

Alternatively, --standalone can be set to a custom UMD module name as well.

genji -M -S --standalone MyModule -O dest/out.js src/index.jsx

Compiling Libraries

You can use Genji to compile code libraries by leveraging browserify's expose and external options.

genji lib/mylib.js react react-dom -E mylib react react-dom -O dest/lib.js
genji src/index.js -X mylib react react-dom -O dest/index.js

This example will compile a dest/lib.js bundle that contains lib/mylib.js, react and react-dom (exposed as module IDs mylib, react and react-dom). Then it will compile a dest/index.js bundle that externalizes the module IDs mylib, react and react-dom (i.e. they won't be included in the bundle). To load dest/index.js you will have to ensure that dest/lib.js is loaded first in the browser.

<script src="/dest/lib.js"></script>
<script src="/dest/index.js"></script>

Why do this?

There are a few benefits:

1. Reduce compilation time since bundles only ever need to be re-compiled unless their source files change. So you could compile a bundle for modules in node_modules just once.

2. Since, not all source will be changing with the same frequency, your users can cache library bundle code for much longer periods, thereby reducing the amount of bytes they have to download when code does change.

However, there is now overhead in managing this code-library relationship, ensuring that the appropirate library bundles are loaded first.

API

genji(entryFiles, outFileName, options)

Compile and bundle the entry files into a single file suitable for the browser.

Supported options:

• watch {default: false} Watch the source modules and re-compile when they change
• minify {default: false} Minify the output bundle
• sourceMaps {default: false} Generate a separate source map file
• standalone {default: ''} The name of the UMD global export
• project {default: '.'} The directory or file path to a tsconfig.json
• expose The exposed module identifiers for each entry file
• external External module identfiers to treat as external modules

NOTE: When watch is true, the promise returned will never be resolved.

Example:

import genji from '@launchfort/genji'

genji([ 'src/index.ts' ], 'dest/out.js', {
  minify: true,
  sourceMaps: true,
  standalone: 'MyModule',
  project: 'tsconfig.json'
})
  .then(() => console.log('done!'))
  .catch(error => console.error(error))

Building

To build the source

npm run build
npm run build:node

To clean all generated folders

npm run clean

Testing

Unit tests are expected to be colocated next to the module/file they are testing and have the following suffix .test.js.

To run unit tests through istanbul and mocha

npm test

Maintainence

To check what modules in node_modules is outdated

npm run audit

To update outdated modules while respecting the semver rules in the package.json

npm update

To update a module to the latest major version (replacing what you have)

npm install themodule@latest -S (if to save in dependencies)
npm install themodule@latest -D (if to save in devDependencies)