@so1ve/leafac-html

@so1ve/html

HTML tagged template literals

Videos

Demonstration

Code Review

Installation

$ npm install @so1ve/html

Use @so1ve/html with Prettier (automatic formatting), and the Visual Studio Code extensions Prettier - Code formatter (Prettier support) and es6-string-html (syntax highlighting).

Features, Usage, and Examples

• Use tagged template literals as an HTML template engine. For example:

  import html from "@so1ve/html";
  
  console.log(html`<p>${"Leandro Facchinetti"}</p>`); // => <p>Leandro Facchinetti</p>
  

• Safe by default. For example:

  console.log(html`<p>${`<script>alert(1);</script>`}</p>`); // => <p>&#x3C;script&#x3E;alert(1);&#x3C;/script&#x3E;</p>
  

• Unsafely interpolate trusted HTML with $${...}. For example:

  console.log(html`<p>$${`<span>Leandro Facchinetti</span>`}</p>`); // => <p><span>Leandro Facchinetti</span></p>
  

• Join interpolated arrays. For example:

  console.log(html`<p>${["Leandro", " ", "Facchinetti"]}</p>`); // => <p>Leandro Facchinetti</p>
  

  Array interpolations are safe by default; if you wish to unsafely interpolate an array of trusted HTML use $${[...]}.

• @so1ve/html doesn’t encode HTML itself. It relies on he, which is much more robust than any bespoke encoding.

• @so1ve/html doesn’t try to format the output. If you need pretty HTML, you may call Prettier programmatically on the output.

• @so1ve/html generates strings. No kind of virtual DOM here. For readability, the HTML type is exported in TypeScript, and you may use it like in the following example:

  import { html, HTML } from ".";
  const name: HTML = html`<p>Leandro Facchinetti</p>`;
  console.log(name);
  

• @so1ve/html sanitizes (removes) invalid XML characters. It uses sanitize-xml-string. For example:

  console.log(html`<p>A backspace is invalid in XML: |\b|</p>`); // => <p>A backspace is invalid in XML: ||</p>
  

Related Projects

• https://npm.im/@so1ve/sqlite: better-sqlite3 with tagged template literals.
• https://npm.im/@so1ve/sqlite-migration: A lightweight migration system for @so1ve/sqlite.

Prior Art

• https://npm.im/html-template-tag:
  • Was a major inspiration for this. Its design is simple and great. In particular, I love (and stole) the idea of using $${...} to mark safe interpolation.
  • Doesn’t encode arrays by default.
  • Uses a bespoke encoding.
  • Has awkward types that require substitutions to be strings, as opposed to anys.
• https://npm.im/common-tags:
  • Doesn’t encode interpolated values by default.
  • Uses the safeHtml tag, which isn’t recognized by Prettier & the es6-string-html Visual Studio Code extension.
• https://npm.im/escape-html-template-tag:
  • Awkward API with escapeHtml.safe() and escapeHtml.join() instead of the $${} trick.
  • Uses a bespoke encoding.
• https://npm.im/lit-html, https://npm.im/nanohtml, https://npm.im/htm, and https://npm.im/viperhtml:
  • Have the notion of virtual DOM instead of simple strings.