rollup-plugin-htmlparts

This helps you import HTML snippets into JavaScript variables using modules.

Suppose you want this in your index.js:

var heading = '<h1>This is the <em>heading</em></h1>'
var body = '<p>This is the <strong>body</strong>.</p>'

... but prefer to use HTML files to save HTML (for syntax-highlighting, etc.), then create a HTML file like this (called, for example, template.html):

<!-- var heading -->
  <h1>This is the <em>heading</em></h1>
<!-- end -->

<!-- var body -->
  <p>This is the <strong>body</strong>.</p>
<!-- end -->

Set up your rollup.config.js like this:

import htmlparts from 'rollup-plugin-htmlparts'

export default [
  {
    input: 'index.js',
    output: { file: "index.min.js", name: "package", format: "umd" },
    plugins: [htmlparts('template.html')]
  }
]

Now, in the index.js mentioned above, you can import variables from template.html.

import { heading, body } from './template.html'

Run node_modules/.bin/rollup -c to create the index.min.js, which will have the imported variables.

HTML structure

Anything enclosed within <!-- var <name> --> ... <!-- end --> is treated as a HTML string and assigned to the variable <name>.

The string is minified by HTML Minifier with these options:

• collapseBooleanAttributes: true
• collapseInlineTagWhitespace: true
• collapseWhitespace: true
• decodeEntities: true
• removeComments: true

Installation

npm install rollup-plugin-htmlparts

Changelog

• 1.0.0: 9 Mar 2019 - Initial release
• 1.1.1: 9 Mar 2019 - Switch to ES6 modules
• 1.1.2: 10 Mar 2019 - Works on ES6 modules and CJS
• 1.2.0: 19 Mar 2019 - Ignores whitespace in <!-- var --> and <!-- end -->
• 1.2.1: 4 Jan 2022 - Upgrade packages for security vulnerabilities
• 1.2.2: 23 Nov 2022 - Upgrade packages for security vulnerabilities

Release

# Update package.json version
# Update Changelog in README.md
npm test
git commit . -m"DOC: Release version x.x.x"
git push
# Ensure that there are no CI build errors
git tag -a vx.x.x -m"Add a one-line summary"
git push --follow-tags
npm publish     # maintainer: sanand0