config for ways to omit declarative shadow dom (lightMode) (#19)

* config for various ways to omit declarative shadow dom * non shadow dom styling * includeShadowRoots config spec * refactor out double getInnerHTML call * refactor to lightMode config * documentation * quick docs update
ProjectEvergreen · May 11, 2022 · 71cf93f · 71cf93f
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diff --git a/README.md b/README.md
@@ -23,6 +23,7 @@ In addition, WCC hopes to provide a surface area to explore patterns around [str
 ## Key Features
 
 1. Supports the following `HTMLElement` lifecycles and methods on the server side
+    - `constructor`
     - `connectedCallback`
     - `attachShadow`
     - `innerHTML`

diff --git a/build.js b/build.js
@@ -11,7 +11,9 @@ async function init() {
   const distRoot = './dist';
   const pagesRoot = './docs/pages';
   const pages = await fs.readdir(new URL(pagesRoot, import.meta.url));
-  const { html } = await renderToString(new URL('./docs/index.js', import.meta.url), false);
+  const { html } = await renderToString(new URL('./docs/index.js', import.meta.url), {
+    lightMode: true
+  });
 
   // await fs.rm(distRoot, { recursive: true, force: true });
   // await fs.mkdir('./dist', { recursive: true });
@@ -65,7 +67,7 @@ async function init() {
       <html lang="en" prefix="og:http://ogp.me/ns#">
       
         <head>
-          <title>Web Components Compiler (WCC)</title>
+          <title>WCC - Web Components Compiler</title>
           <meta property="og:title" content="Web Components Compiler (WCC)"/>
           <link rel="stylesheet" href="https://unpkg.com/simpledotcss@2.1.0/simple.min.css">
         </head>

diff --git a/docs/components/footer.js b/docs/components/footer.js
@@ -3,24 +3,20 @@ const template = document.createElement('template');
 template.innerHTML = `
   <style>
     footer {
-      bottom: 0;
-      width: 100%;
       background-color: var(--accent);
       min-height: 30px;
-      padding-top: 10px;
+      padding: 10px 0;
       grid-column: 1 / -1;
-    }
-
-    footer a {
-      color: #efefef;
-      text-decoration: none;
+      text-align: center;
     }
 
     footer h4 {
-      width: 90%;
       margin: 0 auto;
-      padding: 0;
-      text-align: center;
+    }
+
+    footer a:visited {
+      color: var(--text);
+      text-decoration: none;
     }
   </style>
 

diff --git a/docs/components/navigation.js b/docs/components/navigation.js
@@ -3,22 +3,21 @@ const template = document.createElement('template');
 
 template.innerHTML = `
   <style>
-    ul {
+    nav ul {
       list-style-type: none;
-      color: #efefef;
       overflow: auto;
       grid-column: 1 / -1;
     }
 
-    ul li {
+    nav ul li {
       float: left;
       width: 33%;
       text-align: center;
       margin: 10px 0;
     }
 
-    ul li a:visited {
-      color: #efefef;
+    nav ul li a, nav ul li a:visited {
+      color: var(--text);
     }
   </style>
 

diff --git a/docs/pages/docs.md b/docs/pages/docs.md
@@ -11,6 +11,11 @@ This function takes a `URL` to a JavaScript file that defines a custom element,
 const { html } = await renderToString(new URL('./src/index.js', import.meta.url));
 ```
 
+#### Options
+
+`renderToString` also supports a second parameter that is an object, called `options`, which supports the following configurations:
+
+- `lightMode`: For more static outcomes (e.g. no declarative shadow DOM), this option will omit all wrapping `<template shadowroot="...">` tags when rendering out custom elements.  Useful for static sites or working with global CSS libraries.
 
 ## Metadata
 
@@ -72,6 +77,7 @@ export async function getData() {
 > _See our [examples page](/examples/) for more info._
 
 ## Conventions
+
 - Make sure to define your custom elements with `customElements.define`
 - Make sure to `export default` your custom element base class
 - Avoid [touching the DOM in `constructor` methods](https://twitter.com/techytacos/status/1514029967981494280)
diff --git a/src/wcc.js b/src/wcc.js
@@ -9,14 +9,14 @@ import fs from 'node:fs/promises';
 
 let definitions;
 
-async function renderComponentRoots(tree) {
+async function renderComponentRoots(tree, includeShadowRoots = true) {
   for (const node of tree.childNodes) {
     if (node.tagName && node.tagName.indexOf('-') > 0) {
       const { tagName } = node;
       const { moduleURL } = definitions[tagName];
       const elementInstance = await initializeCustomElement(moduleURL, tagName, node.attrs);
 
-      const shadowRootHtml = elementInstance.getInnerHTML({ includeShadowRoots: true });
+      const shadowRootHtml = elementInstance.getInnerHTML({ includeShadowRoots });
       const shadowRootTree = parseFragment(shadowRootHtml);
 
       // TODO safeguard against non-declared custom elements, e.g. using <my-element></my-element>
@@ -25,12 +25,12 @@ async function renderComponentRoots(tree) {
     }
 
     if (node.childNodes && node.childNodes.length > 0) {
-      await renderComponentRoots(node);
+      await renderComponentRoots(node, includeShadowRoots);
     }
 
     // does this only apply to `<template>` tags?
     if (node.content && node.content.childNodes && node.content.childNodes.length > 0) {
-      await renderComponentRoots(node.content);
+      await renderComponentRoots(node.content, includeShadowRoots);
     }
   }
 
@@ -92,18 +92,18 @@ async function initializeCustomElement(elementURL, tagName, attrs = []) {
   return elementInstance;
 }
 
-async function renderToString(elementURL, fragment = true) {
+async function renderToString(elementURL, options = {}) {
   definitions = [];
+  const { lightMode = false } = options;
+  const includeShadowRoots = !lightMode;
 
   const elementInstance = await initializeCustomElement(elementURL);
-  const elementHtml = elementInstance.getInnerHTML({ includeShadowRoots: false });
+  const elementHtml = elementInstance.getInnerHTML({ includeShadowRoots });
   const elementTree = parseFragment(elementHtml);
-  const finalTree = await renderComponentRoots(elementTree);
-
-  elementInstance.shadowRoot.innerHTML = serialize(finalTree);
+  const finalTree = await renderComponentRoots(elementTree, includeShadowRoots);
 
   return {
-    html: elementInstance.getInnerHTML({ includeShadowRoots: fragment }),
+    html: serialize(finalTree),
     metadata: definitions
   };
 }

diff --git a/test/cases/config-light-mode/config-light-mode.spec.js b/test/cases/config-light-mode/config-light-mode.spec.js
@@ -0,0 +1,88 @@
+/*
+ * Use Case
+ * Run wcc against nested custom elements with nested declarative shadow dom and ensure no shadow is included
+ *
+ * User Result
+ * Should return the expected HTML output for all levels of element nesting.
+ *
+ * User Workspace
+ * src/
+ *   components/
+ *     navigation.js
+ *     header.js
+ *   pages/
+ *     index.js
+ * 
+ * Config
+ * {
+ *   lightMode: true
+ * }
+ */
+
+import chai from 'chai';
+import { JSDOM } from 'jsdom';
+import { renderToString } from '../../../src/wcc.js';
+
+const expect = chai.expect;
+
+describe('Run WCC For ', function() {
+  const LABEL = 'Nested Custom Element w/ no using Light Mode configuration';
+  let dom;
+
+  before(async function() {
+    const { html } = await renderToString(new URL('./src/pages/index.js', import.meta.url), {
+      lightMode: true
+    });
+
+    dom = new JSDOM(html);
+  });
+
+  describe(LABEL, function() {
+    it('should not have one top level <template> with an open shadowroot', function() {
+      expect(dom.window.document.querySelectorAll('template[shadowroot="open"]').length).to.equal(0);
+      expect(dom.window.document.querySelectorAll('template').length).to.equal(0);
+    });
+
+    describe('static page content', function() {
+      it('should have the expected static content for the page', function() {
+        expect(dom.window.document.querySelector('h1').textContent).to.equal('Home Page');
+      });
+    });
+
+    describe('custom header element with nested navigation element', function() {
+      let headerContentsDom;
+
+      before(function() {
+        headerContentsDom = new JSDOM(dom.window.document.querySelectorAll('header')[0].innerHTML);
+      });
+
+      it('should have a <header> tag within the <template> shadowroot', function() {
+        expect(dom.window.document.querySelectorAll('header').length).to.equal(1);
+      });
+
+      it('should have expected content within the <header> tag', function() {
+        const content = headerContentsDom.window.document.querySelector('a h4').textContent;
+
+        expect(content).to.contain('My Personal Blog');
+      });
+
+      describe('nested navigation element', function() {
+        let navigationContentsDom;
+
+        before(function() {
+          navigationContentsDom = new JSDOM(headerContentsDom.window.document.querySelectorAll('wcc-navigation')[0].innerHTML);
+        });
+
+        it('should have a <nav> tag within the <template> shadowroot', function() {
+          expect(navigationContentsDom.window.document.querySelectorAll('nav').length).to.equal(1);
+        });
+
+        it('should have three links within the <nav> element', function() {
+          const links = navigationContentsDom.window.document.querySelectorAll('nav ul li a');
+
+          expect(links.length).to.equal(3);
+        });
+      });
+    });
+  });
+});
diff --git a/test/cases/config-light-mode/src/components/header.js b/test/cases/config-light-mode/src/components/header.js
@@ -0,0 +1,43 @@
+// intentionally nested to test wcc nested dependency resolution logic
+import './navigation.js';
+
+class Header extends HTMLElement {
+  connectedCallback() {
+    if (!this.shadowRoot) {
+      this.attachShadow({ mode: 'open' });
+      this.shadowRoot.innerHTML = this.render();
+    }
+  }
+
+  render() {
+    return `
+      <header class="header">
+        <div class="head-wrap">
+          <div class="brand">
+            <a href="/">
+              <img src="/www/assets/greenwood-logo.jpg" alt="Greenwood logo"/>
+              <h4>My Personal Blog</h4>
+            </a>
+          </div>
+
+          <wcc-navigation></wcc-navigation>
+
+          <div class="social">
+            <a href="https://github.com/ProjectEvergreen/greenwood">
+              <img
+                src="https://img.shields.io/github/stars/ProjectEvergreen/greenwood.svg?style=social&logo=github&label=github"
+                alt="Greenwood GitHub badge"
+                class="github-badge"/>
+            </a>
+          </div>
+        </div>
+      </header>
+    `;
+  }
+}
+
+export {
+  Header
+};
+
+customElements.define('wcc-header', Header);
diff --git a/test/cases/config-light-mode/src/components/navigation.js b/test/cases/config-light-mode/src/components/navigation.js
@@ -0,0 +1,27 @@
+// intentionally nested in the assets/ directory to test wcc nested dependency resolution logic
+const template = document.createElement('template');
+
+template.innerHTML = `
+  <nav>
+    <ul>
+      <li><a href="/">Home</a></li>
+      <li><a href="/about">About</a></li>
+      <li><a href="/artists">Artists</a></li>
+    <ul>
+  </nav>
+`;
+
+class Navigation extends HTMLElement {
+  connectedCallback() {
+    if (!this.shadowRoot) {
+      this.attachShadow({ mode: 'open' });
+      this.shadowRoot.appendChild(template.content.cloneNode(true));
+    }
+  }
+}
+
+export {
+  Navigation
+};
+
+customElements.define('wcc-navigation', Navigation);
diff --git a/test/cases/config-light-mode/src/pages/index.js b/test/cases/config-light-mode/src/pages/index.js
@@ -0,0 +1,25 @@
+import '../components/header.js';
+
+export default class HomePage extends HTMLElement {
+  constructor() {
+    super();
+
+    if (this.shadowRoot) {
+      // console.debug('HomePage => shadowRoot detected!');
+    } else {
+      this.attachShadow({ mode: 'open' });
+    }
+  }
+
+  connectedCallback() {
+    this.shadowRoot.innerHTML = this.getTemplate();
+  }
+
+  getTemplate() {
+    return `
+      <wcc-header></wcc-header>
+
+      <h1>Home Page</h1>
+    `;
+  }
+}