ncat

Node CLI to concatenate multiple files, with their sourcemaps and optionally stdin, a banner and a footer.

Installation

$ npm i -g|-D ncat

Usage

$ ncat [<FILES ...>] [OPTIONS] [-o|--output <OUTPUT_FILE>]

The arguments may be a list of files:

$ ncat file_1.js file_2.js -o dist/bundle.js

or a list of globs:

$ ncat 'src/**/*.js !**/rainbow.js' src/**/{cake,unicorn}.css -o dist/bundle.js

If file is a single dash (-) ncat reads from the standard input:

$ echo 'Insert between file_1.js and file_2.js' | ncat file_1.js - file_2.js -o dist/bundle.js

If -o|--output is omitted ncat writes to the standard input:

$ ncat file_1.js file_2.js | uglifyjs > dist/bundle.min.js

Options

Name	Type	Default	Description
-o, --output	{String}	undefined	Output File
-m, --map	{Boolean}	false	Create an external sourcemap (including the sourcemaps of existing files)
-e, --map-embed	{Boolean}	false	Embed the code in the sourcemap (only apply to code without an existing sourcemap)
-b, --banner	{Boolean|String}	false	Add a banner built with the package.json file. Optionally pass the path to a .js file containing custom banner that can be called with require()
-f, --footer	{String}	undefined	The path to .js file containing custom footer that can be called with require()
-h, --help	{Boolean}	false	CLI Help
-v, --version	{Boolean}	false	CLI Version

Examples

Concatenate files and standard input

Files

---------- file_1.min.js ----------
< First part of JS code (minified) ... >

---------- file_2.js ----------
<Second part of JS code ... >

Command

$ uglifyjs file_2.js | ncat file_1.min.js - --output dist/bundle.js

Result

---------- dist/bundle.js ----------
< First part of JS code (minified) ... >

< Second part of JS code (minified) ... >

Concatenate with sourcemaps

Files

---------- file_1.js ----------
< First part of JS code ... >

/*# sourceMappingURL=file_1.js.map */

---------- file_1.js.map ----------
{"version": 3,"file": "file_1.js", ... }

---------- file_2.js ----------
< Second part of JS code ... >

/*# sourceMappingURL=file_2.js.map */

---------- file_2.js.map ----------
{"version": 3,"file": "file_2.js", ... }

Command

$ ncat file_1.js file_2.js --map --output dist/bundle.js

Result

---------- dist/bundle.js ----------
< First part of JS code ... >

< Second part of JS code ... >

/*# sourceMappingURL=bundle.map */

---------- bundle.js.map ----------
{"version": 3,"file": "bundle.js", ... }

Add a banner to a file

Files

---------- bootstrap.js ----------
< JS code ... >

Command

$ ncat bootstrap.js --banner --output dist/bundle.js

Result

---------- dist/bundle.js ----------
/*!
 * Bootstrap v4.0.0
 * https://getbootstrap.com
 *
 * Copyright 2017 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
 * Licensed under MIT license
 */

< JS code ... >

Add a custom banner and footer to a file

Files

---------- bootstrap.js ----------
< JS code ... >

---------- build/banner.js ----------
const pkg = require('read-pkg-up').sync().pkg;
module.exports =
`/*!
 * ${pkg.name} v${pkg.version} (${pkg.homepage})
 *
 * Copyright (c) 2011-${new Date().getFullYear()} ${pkg.author.name}
 * Licensed under the ${pkg.license} license */

(function () {`;

---------- build/footer.js ----------
module.exports = `
})()`

Command

$ ncat bootstrap.js --banner build/banner.js --footer build/footer.js --output dist/bundle.js

Result

---------- dist/bundle.js ----------
/*!
 * Bootstrap v4.0.0 (https://getbootstrap.com)
 *
 * Copyright (c) 2011-2017 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
 * Licensed under the MIT license */

(function () {
< JS code ... >
})()