rollup-plugin-fast-tagged-templates

This Rollup plugin compresses tagged template literals for FAST Element templates and styles.

Supported tags

Tagged template literals:

• html
• css

Additionally, the css.partial tagged template literal and html.partial() function are supported.

Installation

npm install --save-dev rollup-plugin-fast-tagged-templates

Usage

css templates are compressed with a custom minifier, which removes whitespace and comments. html templates are compressed with html-minifier-terser. The default options are intentionally set to be conservative, with only collapseWhitespace and removeComments enabled. For both CSS and HTML, comments are preserved if they contain expressions.

Basic usage

By default, the plugin will compress both HTML and CSS tagged templates:

import { rollup } from "rollup";
import fastTaggedTemplates from "rollup-plugin-fast-tagged-templates";

rollup({
  input: "src/index.js",
  plugins: [fastTaggedTemplates()],
});

Minification examples

HTML

- html`
-   <template
-     @click="${(x, c) => x.clickHandler(c.event)}"
-   >
-     <slot ${ref("slot")}></slot>
-   </template>
- `;
+ html`<template @click="${(x,c)=>x.clickHandler(c.event)}"><slot ${ref("slot")}></slot></template>`;

CSS

- export const styles = css`
-   ${display("block")}
-   :host {
-     padding: ${paddingToken};
-   }
-
-   :host(${focusVisible}) ::slotted(*) {
-     outline: 2px solid ${focusVisible};
-   }
- `;
+ export const styles = css`${display("block")} :host{padding:${paddingToken}}:host(${focusVisible}) ::slotted(*){outline:2px solid ${focusVisible}}`;

Disabling compression

To disable compression for either type, set the html or css options to false:

import { rollup } from "rollup";
import fastTaggedTemplates from "rollup-plugin-fast-tagged-templates";

rollup({
  input: "src/index.js",
  plugins: [
    fastTaggedTemplates({
      // Disable compression for HTML templates
      html: false,
    }),
  ],
});

HTML minification options

Options for html-minifier-terser can be passed to the minifyHTMLOptions option. These will be merged with the default options.

import { rollup } from "rollup";
import fastTaggedTemplates from "rollup-plugin-fast-tagged-templates";

rollup({
  input: "src/index.js",
  plugins: [
    fastTaggedTemplates({
      minifyHTMLOptions: {
        removeAttributeQuotes: true,
      },
    }),
  ],
});

Overriding the default transformations

To override the default minification functions entirely, pass a custom function to the corresponding option. Each function should take the source string as an argument and return the compressed string.

import { rollup } from "rollup";
import fastTaggedTemplates from "rollup-plugin-fast-tagged-templates";

rollup({
  input: "src/index.js",
  plugins: [
    fastTaggedTemplates({
      html(source) {
        // Replace the default minification function for html templates
        return source;
      },

      css(source) {
        // Replace the default minification function for css templates
        return source;
      },
    }),
  ],
});

Using with TypeScript

If you're using @rollup/plugin-typescript or rollup-plugin-esbuild, make sure to use the plugin after transpiling:

import typescript from "@rollup/plugin-typescript";
import fastTaggedTemplates from "rollup-plugin-fast-tagged-templates";

rollup({
  input: "src/index.ts",
  plugins: [typescript(), fastTaggedTemplates()],
});

Additionally, minification has to be handled after the plugin transforms the source. For plugins like rollup-plugin-esbuild, the minify option should be set to false and the separate minify plugin should be used. See the rollup-plugin-esbuild README for more information.

import esbuild, { minify } from "rollup-plugin-esbuild";
import fastTaggedTemplates from "rollup-plugin-fast-tagged-templates";

rollup({
  input: "src/index.ts",
  plugins: [esbuild({ minify: false }), fastTaggedTemplates(), minify()],
});

Contributing

See CONTRIBUTING.md for more information.

License

MIT