@localnerve/web-component-build

Web Component Build

Assembles a web component from css, html, and js parts, assists user build flexibility

Assembles a web component from its parts, allows developers to author the component's parts in separate files.
The parts are processed and written to an output directory, then exposed to a calling build process.

• Why This Exists
• Processing Possibilities
• Usage
• API
• Options
• Result

Why This Exists

• Author web components in separate JS, CSS, and HTML files
• Expose CSS for the web component to builds for computing CSP hashes
• Expose HTML for the web component to builds for companion templates and/or DSD for SSR builds
• Enable/ease paying these conveniences forward in web component distribution packages

Processing Map

The following is a table of some of the possible input, processing, and output combos. See options for detailed explanations.

input	processing	output
javascript	minify javascript	javascript
css	minify css	css
html	minify html	html
css, html	minify css, prepend style tag to html, minify html	css, html
css, html, cssHref	minfy css, prepend style tag to html, prepend link tag to html, minify html	css, html
cssHref, html	prepend link tag to html, minify html	html
javascript, css	minify css, merge style tag into javascript, minify javascript	css, javascript
javascript, css, html	minify css, prepend style tag to html, minify html, merge into javascript, minify javascript	css, html, javascript
javascript, css, html, cssHref	minify css, prepend style tag to html, prepend link tag to html, minify html, merge into javascript, minify javascript	css, html, javascript
javascript, html	minify html, merge into javascript, minify javascript	html, javascript
javascript, html, cssHref	prepend link tag to html, minify html, merge into javascript, minify javascript	html, javascript
javascript, cssHref	add link tag to javascript, minify javascript	javascript

By default, html minification minifies any css found therein.

Usage

  // Sample usage, all options specified
  import {build} from '@localnerve/web-component-build';
  const outputDir = 'some/path/output';

  const result = await build(outputDir, {
    cssPath: '/some/path/file.css',
    cssLinkHref: '//some/path/file.css',
    jsPath: '/some/path/file.js',
    htmlPath: '/some/path/file.html',
    jsReplacement: '__REPLACEMENT_IN_JS__',
    terserOptions: { /* terser options */ },
    htmlminOptions: { /* html-minifier options */ },
    cleancssOptions: { /* clean-css options */ },
    minifySkip: false
  });
  // html, js, and css written to `outputDir`
  
  // Retrieve processed content
  const [js, css, html] = await Promise.all([
    result.getJs(), result.getCss(), result.getHtml()
  ]);

  // Retrieve output paths
  const [jsPath, cssPath, htmlPath] = [result.jsPath, result.cssPath, result.htmlPath];

API

This library exports a single function that takes an output directory and processing options, returns a result object.

build (outputDir, options): Result

outputDir {String}, required

Full path to the output directory where css, html, and javascript output are written.

Options {Object}, optional*

* Not really. One or more of cssPath, jsPath, and/or htmlPath must be supplied. They have no default, so if no options are supplied, this library throws an exception.

• cssPath {String} - Full path to the input css file
  If supplied:

  • css will be minified using cleancssOptions
  • css will be wrapped in a style tag
  • css will be inserted into the javascript file if jsReplacement and jsPath are supplied and no htmlPath supplied
  • css will be prepended to the html file if htmlPath is supplied

• cssLinkHref {String} - link href to a stylesheet resource to be referenced by the web component
  If supplied:

  • href will be wrapped in a link tag
  • resulting link will be prepended to the html file if htmlPath supplied
  • resulting link will be inserted into the javascript file if no htmlPath supplied and jsReplacement and jsPath supplied

• htmlPath {String} - Full path to the input html file
  If supplied:

  • css will be prepended in a style tag
  • cssLinkHref will be prepended in a link tag
  • html will be inserted into the javascript file if jsReplacement and jsPath is supplied

• jsPath {String} - Full path to the input javascript file

• jsReplacement {String|RegExp} - The replacement pattern for the css or html in the javascript file. See pattern for full documentation
  If supplied:

  • A replacement will be attempted in the javascript file, jsPath must also be supplied
  • If not supplied or falsy, No replacement will be attempted and all assets are just copied to outputDir

• terserOptions {Object} - The javascript minifier options object
  Defaults:

  {
    ecma: 2022
  }
  

• htmlminOptions {Object} - The html minifier options object
  Defaults:

  {
    minifyJS: true,
    minifyCSS: true,
    collapseWhitespace: true,
    removeAttributeQuotes: true,
    removeComments: true
  }
  

• cleancssOptions {Object} - The css minifier options object
  Defaults (same as clean-css defaults)

• minifySkip {Boolean} - True to skip all minifications, defaults to false

Result {Object}

The output of the build process. Allows access to the output paths and full output content. Format:

• cssPath {String}, The full path to the output css

• htmlPath {String}, The full path to the output html

• jsPath {String}, The full path to the output javascript

• getCss {asyncFunction}, gets the output css

• getHtml {asyncFunction}, gets the output html

• getJs {asyncFunction}, gets the output javascript

License

• BSD-3 Clasuse, Alex Grant, LocalNerve