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1823 lines (1660 loc) · 55.2 KB
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="color-scheme" content="light dark">
<meta name="description" content="Detailed API and binding specification for @node-projects/base-custom-webcomponent.">
<title>base-custom-webcomponent · Technical Specification</title>
<style>
:root {
--ink: #17211b;
--muted: #657168;
--paper: #f5f2e9;
--surface: rgba(255, 255, 255, 0.76);
--surface-solid: #fffdf7;
--line: #d9d8ca;
--green: #0b6b50;
--green-dark: #084c3a;
--mint: #dff2e8;
--amber: #b75d16;
--amber-soft: #fff0dc;
--red: #a43d36;
--red-soft: #fbe9e6;
--blue: #315f86;
--code: #14201a;
--code-ink: #e8f2e7;
--shadow: 0 24px 70px rgba(34, 45, 37, 0.12);
--radius: 18px;
--mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
--sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
--serif: Georgia, "Times New Roman", serif;
}
* {
box-sizing: border-box;
}
html {
scroll-behavior: smooth;
scroll-padding-top: 2rem;
}
body {
margin: 0;
color: var(--ink);
background:
radial-gradient(circle at 10% 0%, rgba(72, 144, 111, 0.18), transparent 30rem),
radial-gradient(circle at 95% 18%, rgba(225, 159, 87, 0.16), transparent 28rem),
var(--paper);
font: 16px/1.68 var(--sans);
}
a {
color: var(--green);
text-decoration-thickness: 0.08em;
text-underline-offset: 0.18em;
}
a:hover {
color: var(--green-dark);
}
code,
pre {
font-family: var(--mono);
}
code {
font-size: 0.9em;
color: var(--green-dark);
background: rgba(11, 107, 80, 0.08);
padding: 0.12em 0.32em;
border-radius: 0.32em;
}
.page {
width: min(1480px, 100%);
margin: 0 auto;
padding: 28px;
display: grid;
grid-template-columns: 278px minmax(0, 1fr);
gap: 42px;
}
.sidebar {
position: sticky;
top: 24px;
align-self: start;
max-height: calc(100vh - 48px);
overflow: auto;
padding: 22px;
border: 1px solid var(--line);
border-radius: var(--radius);
background: rgba(255, 253, 247, 0.78);
backdrop-filter: blur(16px);
box-shadow: 0 16px 50px rgba(34, 45, 37, 0.08);
}
.brand {
display: flex;
gap: 12px;
align-items: center;
padding-bottom: 18px;
border-bottom: 1px solid var(--line);
}
.mark {
width: 42px;
height: 42px;
flex: 0 0 auto;
border-radius: 13px;
display: grid;
place-items: center;
color: white;
background: var(--green);
box-shadow: inset 0 -8px 16px rgba(0, 0, 0, 0.12);
font: 700 15px/1 var(--mono);
}
.brand strong,
.brand small {
display: block;
}
.brand strong {
font-size: 0.9rem;
line-height: 1.2;
overflow-wrap: anywhere;
}
.brand small {
color: var(--muted);
margin-top: 4px;
font-size: 0.74rem;
letter-spacing: 0.08em;
text-transform: uppercase;
}
.sidebar h2 {
margin: 20px 0 8px;
font-size: 0.7rem;
letter-spacing: 0.14em;
text-transform: uppercase;
color: var(--muted);
}
.sidebar ol {
list-style: none;
padding: 0;
margin: 0;
}
.sidebar a {
display: block;
padding: 6px 9px;
color: var(--muted);
text-decoration: none;
border-left: 2px solid transparent;
border-radius: 0 8px 8px 0;
font-size: 0.88rem;
}
.sidebar a:hover,
.sidebar a:focus-visible {
color: var(--green-dark);
background: var(--mint);
border-left-color: var(--green);
outline: none;
}
.sidebar-meta {
margin-top: 20px;
padding-top: 16px;
border-top: 1px solid var(--line);
color: var(--muted);
font-size: 0.75rem;
}
main {
min-width: 0;
}
.hero {
position: relative;
overflow: hidden;
min-height: 560px;
padding: clamp(36px, 7vw, 92px);
border-radius: 30px;
color: #f4fbf6;
background:
linear-gradient(145deg, rgba(255, 255, 255, 0.06), transparent 35%),
var(--green-dark);
box-shadow: var(--shadow);
display: flex;
flex-direction: column;
justify-content: flex-end;
}
.hero::before,
.hero::after {
content: "";
position: absolute;
border-radius: 999px;
pointer-events: none;
}
.hero::before {
width: 440px;
height: 440px;
right: -120px;
top: -150px;
border: 1px solid rgba(255, 255, 255, 0.18);
box-shadow:
0 0 0 38px rgba(255, 255, 255, 0.035),
0 0 0 80px rgba(255, 255, 255, 0.025);
}
.hero::after {
width: 180px;
height: 180px;
right: 14%;
bottom: -90px;
background: #d28a45;
opacity: 0.8;
filter: blur(1px);
}
.eyebrow {
position: relative;
z-index: 1;
display: inline-flex;
align-items: center;
gap: 8px;
align-self: flex-start;
margin-bottom: 26px;
padding: 7px 12px;
border: 1px solid rgba(255, 255, 255, 0.2);
border-radius: 999px;
color: #d5ebdd;
background: rgba(255, 255, 255, 0.07);
font-size: 0.75rem;
letter-spacing: 0.12em;
text-transform: uppercase;
}
.eyebrow::before {
content: "";
width: 7px;
height: 7px;
border-radius: 50%;
background: #78d6a8;
box-shadow: 0 0 0 4px rgba(120, 214, 168, 0.14);
}
.hero h1 {
position: relative;
z-index: 1;
max-width: 920px;
margin: 0;
font: 400 clamp(3rem, 7.4vw, 7.4rem)/0.91 var(--serif);
letter-spacing: -0.055em;
}
.hero h1 span {
display: block;
color: #a9d8bd;
font-style: italic;
}
.hero-copy {
position: relative;
z-index: 1;
max-width: 750px;
margin: 30px 0 0;
color: #cde0d4;
font-size: clamp(1rem, 2vw, 1.25rem);
}
.hero-meta {
position: relative;
z-index: 1;
display: flex;
flex-wrap: wrap;
gap: 12px;
margin-top: 34px;
}
.hero-meta span {
padding: 8px 12px;
border-radius: 10px;
color: #e8f4eb;
background: rgba(255, 255, 255, 0.08);
font: 0.78rem/1 var(--mono);
}
section {
margin-top: 72px;
}
.section-head {
display: grid;
grid-template-columns: 120px minmax(0, 1fr);
gap: 26px;
padding-bottom: 22px;
border-bottom: 1px solid var(--line);
margin-bottom: 30px;
}
.section-no {
color: var(--green);
font: 700 0.78rem/1.4 var(--mono);
letter-spacing: 0.08em;
}
.section-head h2 {
margin: 0;
font: 400 clamp(2rem, 4vw, 3.6rem)/1 var(--serif);
letter-spacing: -0.035em;
}
.section-head p {
grid-column: 2;
max-width: 800px;
margin: 0;
color: var(--muted);
font-size: 1.04rem;
}
h3 {
margin: 40px 0 12px;
font-size: 1.24rem;
letter-spacing: -0.02em;
}
h4 {
margin: 28px 0 10px;
color: var(--green-dark);
}
p {
max-width: 82ch;
}
.lead {
max-width: 68ch;
font: 1.36rem/1.6 var(--serif);
color: #354139;
}
.grid {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 18px;
}
.grid.two {
grid-template-columns: repeat(2, minmax(0, 1fr));
}
.card {
padding: 24px;
border: 1px solid var(--line);
border-radius: var(--radius);
background: var(--surface);
box-shadow: 0 14px 40px rgba(34, 45, 37, 0.055);
}
.card h3,
.card h4 {
margin-top: 0;
}
.card p:last-child {
margin-bottom: 0;
}
.card-number {
display: block;
margin-bottom: 24px;
color: var(--green);
font: 700 0.75rem/1 var(--mono);
}
.callout {
margin: 26px 0;
padding: 22px 24px;
border: 1px solid #ebc18d;
border-left: 5px solid var(--amber);
border-radius: 4px var(--radius) var(--radius) 4px;
color: #704018;
background: var(--amber-soft);
}
.callout.danger {
border-color: #e6aaa4;
border-left-color: var(--red);
color: #742d28;
background: var(--red-soft);
}
.callout.info {
border-color: #aac8de;
border-left-color: var(--blue);
color: #284b66;
background: #eaf2f7;
}
.callout strong {
display: block;
margin-bottom: 5px;
}
.code-block {
position: relative;
margin: 20px 0 28px;
border-radius: var(--radius);
overflow: hidden;
background: var(--code);
box-shadow: 0 16px 42px rgba(20, 32, 26, 0.16);
}
.code-label {
padding: 11px 18px;
color: #9db3a3;
border-bottom: 1px solid rgba(255, 255, 255, 0.08);
font: 0.71rem/1 var(--mono);
letter-spacing: 0.08em;
text-transform: uppercase;
}
pre {
margin: 0;
padding: 22px;
overflow: auto;
color: var(--code-ink);
font-size: 0.84rem;
line-height: 1.65;
tab-size: 2;
}
pre code {
padding: 0;
color: inherit;
background: transparent;
border-radius: 0;
font-size: inherit;
}
table {
width: 100%;
margin: 24px 0 32px;
border-collapse: separate;
border-spacing: 0;
overflow: hidden;
border: 1px solid var(--line);
border-radius: 14px;
background: var(--surface-solid);
font-size: 0.91rem;
}
th,
td {
padding: 13px 15px;
text-align: left;
vertical-align: top;
border-bottom: 1px solid var(--line);
}
th {
color: var(--green-dark);
background: #ecf1e9;
font-size: 0.72rem;
letter-spacing: 0.06em;
text-transform: uppercase;
}
tr:last-child td {
border-bottom: 0;
}
tbody tr:hover {
background: rgba(223, 242, 232, 0.4);
}
.signature {
display: block;
color: var(--green-dark);
font: 700 0.9rem/1.5 var(--mono);
overflow-wrap: anywhere;
}
.steps {
display: grid;
grid-template-columns: repeat(5, minmax(0, 1fr));
gap: 2px;
margin: 28px 0;
counter-reset: step;
}
.step {
counter-increment: step;
min-height: 142px;
padding: 20px;
background: var(--surface-solid);
border: 1px solid var(--line);
}
.step:first-child {
border-radius: var(--radius) 0 0 var(--radius);
}
.step:last-child {
border-radius: 0 var(--radius) var(--radius) 0;
}
.step::before {
content: "0" counter(step);
display: block;
margin-bottom: 20px;
color: var(--green);
font: 700 0.72rem/1 var(--mono);
}
.step strong {
display: block;
line-height: 1.35;
}
.step small {
display: block;
margin-top: 8px;
color: var(--muted);
}
.pill {
display: inline-block;
padding: 3px 8px;
border-radius: 999px;
color: var(--green-dark);
background: var(--mint);
font: 700 0.7rem/1.4 var(--mono);
white-space: nowrap;
}
.pill.experimental {
color: #7c4516;
background: var(--amber-soft);
}
.pill.security {
color: #7a2d28;
background: var(--red-soft);
}
.checklist {
list-style: none;
padding: 0;
}
.checklist li {
position: relative;
padding: 8px 0 8px 30px;
border-bottom: 1px solid var(--line);
}
.checklist li::before {
content: "✓";
position: absolute;
left: 0;
top: 8px;
width: 20px;
height: 20px;
border-radius: 50%;
display: grid;
place-items: center;
color: white;
background: var(--green);
font-size: 0.7rem;
font-weight: 800;
}
.checklist li:last-child {
border-bottom: 0;
}
.foot {
margin: 90px 0 30px;
padding: 30px 0;
border-top: 1px solid var(--line);
display: flex;
justify-content: space-between;
gap: 20px;
color: var(--muted);
font-size: 0.82rem;
}
@media (max-width: 1120px) {
.page {
grid-template-columns: 1fr;
}
.sidebar {
position: relative;
top: 0;
max-height: none;
}
.sidebar nav {
columns: 3;
column-gap: 18px;
}
.sidebar h2,
.sidebar-meta {
column-span: all;
}
}
@media (max-width: 820px) {
.page {
padding: 14px;
}
.sidebar nav {
columns: 2;
}
.hero {
min-height: 500px;
padding: 34px 26px;
border-radius: 22px;
}
.grid,
.grid.two {
grid-template-columns: 1fr;
}
.steps {
grid-template-columns: 1fr;
gap: 8px;
}
.step,
.step:first-child,
.step:last-child {
min-height: 0;
border-radius: 12px;
}
.section-head {
grid-template-columns: 1fr;
gap: 8px;
}
.section-head p {
grid-column: 1;
}
table {
display: block;
overflow-x: auto;
}
}
@media (max-width: 520px) {
.sidebar nav {
columns: 1;
}
.hero h1 {
font-size: 3rem;
}
.foot {
flex-direction: column;
}
}
@media (prefers-reduced-motion: reduce) {
html {
scroll-behavior: auto;
}
}
@media print {
body {
background: white;
color: black;
font-size: 10pt;
}
.page {
display: block;
width: 100%;
padding: 0;
}
.sidebar {
display: none;
}
.hero {
min-height: 0;
padding: 30pt;
color: white;
box-shadow: none;
break-after: page;
}
section {
margin-top: 30pt;
}
.card,
table,
.code-block,
.callout {
break-inside: avoid;
box-shadow: none;
}
a {
color: inherit;
}
}
</style>
</head>
<body>
<div class="page">
<aside class="sidebar" aria-label="Specification navigation">
<div class="brand">
<span class="mark" aria-hidden="true"></></span>
<span>
<strong>base-custom-webcomponent</strong>
<small>Technical specification</small>
</span>
</div>
<nav>
<h2>Contents</h2>
<ol>
<li><a href="#scope">01 · Scope & status</a></li>
<li><a href="#architecture">02 · Architecture</a></li>
<li><a href="#authoring">03 · Component authoring</a></li>
<li><a href="#lifecycle">04 · Lifecycle variants</a></li>
<li><a href="#properties">05 · Properties & attributes</a></li>
<li><a href="#bindings">06 · Binding language</a></li>
<li><a href="#events">07 · Events</a></li>
<li><a href="#declarative">08 · Declarative elements</a></li>
<li><a href="#api">09 · API reference</a></li>
<li><a href="#hmr">10 · HMR</a></li>
<li><a href="#security">11 · Security model</a></li>
<li><a href="#compatibility">12 · Compatibility</a></li>
<li><a href="#samples">13 · Runnable samples</a></li>
<li><a href="#limitations">14 · Limits & roadmap</a></li>
</ol>
</nav>
<div class="sidebar-meta">
Package 0.46.0<br>
Specification snapshot · July 2026<br>
BSD-3-Clause
</div>
</aside>
<main>
<header class="hero">
<div class="eyebrow">Implementation-aligned reference</div>
<h1>Native components, <span>with a little glue.</span></h1>
<p class="hero-copy">
A precise guide to the component lifecycle, property conversion,
event wiring, binding grammar, declarative definitions, and trust
boundaries of <strong>@node-projects/base-custom-webcomponent</strong>.
</p>
<div class="hero-meta" aria-label="Package characteristics">
<span>ESM only</span>
<span>ES2023 target</span>
<span>0 runtime dependencies</span>
<span>open Shadow DOM</span>
</div>
</header>
<section id="scope">
<div class="section-head">
<span class="section-no">01 / SCOPE</span>
<h2>Purpose and conformance</h2>
<p>
This document describes version 0.46.0 as implemented in the
repository. It distinguishes supported behavior from experimental
features and known limitations.
</p>
</div>
<p class="lead">
The package is a compact inheritance-based layer over Custom
Elements, Shadow DOM, templates, and constructable stylesheets. It
avoids a virtual DOM and keeps advanced behavior opt-in.
</p>
<div class="grid">
<article class="card">
<span class="card-number">A / CORE</span>
<h3>Browser primitives first</h3>
<p>
Components remain ordinary <code>HTMLElement</code> subclasses.
Templates are cloned into open Shadow Roots and CSS is installed
through <code>adoptedStyleSheets</code>.
</p>
</article>
<article class="card">
<span class="card-number">B / OPT-IN</span>
<h3>Pay for features used</h3>
<p>
Attribute parsing, event assignment, and binding parsing are
explicit protected method calls. A minimal component can skip all
three.
</p>
</article>
<article class="card">
<span class="card-number">C / TRUST</span>
<h3>Application templates</h3>
<p>
The expression language runs JavaScript. Unprefixed text bindings
can insert HTML; explicit <code>text:</code> and
<code>bcw:text</code> bindings render values literally.
Templates remain trusted program source, not a sandbox for
untrusted expressions.
</p>
</article>
</div>
<div class="callout danger">
<strong>Normative security constraint</strong>
A conforming application must not construct binding expressions,
declarative component definitions, or bound HTML from untrusted
input. Expression bindings require direct evaluation and therefore
conflict with a strict CSP that omits <code>unsafe-eval</code>.
</div>
</section>
<section id="architecture">
<div class="section-head">
<span class="section-no">02 / ARCHITECTURE</span>
<h2>Runtime model</h2>
<p>
Each component owns a cloned document fragment and an open,
serializable Shadow Root. The base variant decides when that
fragment is attached and when library lifecycle hooks run.
</p>
</div>
<div class="steps" aria-label="Component construction sequence">
<div class="step">
<strong>Construct host</strong>
<small><code>HTMLElement</code> initialization</small>
</div>
<div class="step">
<strong>Attach Shadow Root</strong>
<small>Open and serializable</small>
</div>
<div class="step">
<strong>Clone template</strong>
<small><code>importNode</code> by default</small>
</div>
<div class="step">
<strong>Adopt styles</strong>
<small>Sheet, array, or promise</small>
</div>
<div class="step">
<strong>Run chosen timing</strong>
<small>Append, setup, and ready</small>
</div>
</div>
<h3>Design invariants</h3>
<ul class="checklist">
<li>There is no render loop or virtual DOM.</li>
<li>State changes do not schedule updates automatically.</li>
<li>A named <code>_bindingsRefresh(property)</code> selects direct dependencies; an unnamed refresh reevaluates all bindings.</li>
<li>Property declarations guide attribute conversion; they are not observers.</li>
<li>Static template and style members are shared by every instance of a subclass.</li>
<li><code>ready()</code> is library-defined and its timing depends on the selected base class.</li>
</ul>
</section>
<section id="authoring">
<div class="section-head">
<span class="section-no">03 / AUTHORING</span>
<h2>Defining a component</h2>
<p>
Static metadata is the most portable authoring form. Legacy
decorators remain available but are not required.
</p>
</div>
<div class="code-block">
<div class="code-label">counter-card.ts</div>
<pre><code>import {
BaseCustomWebComponentConstructorAppend,
css,
html,
} from '@node-projects/base-custom-webcomponent';
export class CounterCard extends BaseCustomWebComponentConstructorAppend {
static readonly is = 'counter-card';
static readonly properties = {
count: Number,
label: String,
disabled: Boolean,
};
static readonly template = html`
<span>[[this.label]]: [[this.count]]</span>
<button @click="increment" ?disabled="[[this.disabled]]">
Add one
</button>
`;
static readonly style = css`
:host { display: inline-flex; gap: .75rem; }
`;
count = 0;
label = 'Count';
disabled = false;
constructor() {
super();
this._restoreCachedInititalValues();
}
ready(): void {
this._parseAttributesToProperties();
this._assignEvents();
this._bindingsParse();
}
increment(): void {
this.count += 1;
this._bindingsRefresh();
}
}
customElements.define(CounterCard.is, CounterCard);</code></pre>
</div>
<div class="grid two">
<article class="card">
<h3>Template functions</h3>
<p>
<span class="signature">html(strings, ...values): HTMLTemplateElement</span>
Creates a template by assigning its source to
<code>template.innerHTML</code>.
</p>
<p>
<span class="signature">htmlFromString(value): HTMLTemplateElement</span>
Equivalent string-based form.
</p>
</article>
<article class="card">
<h3>Stylesheet functions</h3>
<p>
<span class="signature">css(strings, ...values): CSSStyleSheet</span>
Creates a constructable stylesheet and calls
<code>replaceSync()</code>.
</p>
<p>
<span class="signature">cssFromString(value): CSSStyleSheet</span>
Accepts text, a stylesheet, or a CSS-module-style default export.
</p>
</article>
</div>
<div class="callout">
<strong>Interpolation is not escaping</strong>
Values interpolated into <code>html</code> or
<code>htmlFromString</code> become template source. Use only
author-controlled values. Instance data belongs in properties and
bindings.
</div>
</section>
<section id="lifecycle">
<div class="section-head">
<span class="section-no">04 / LIFECYCLE</span>
<h2>Five timing choices</h2>
<p>
The package provides deliberately explicit trade-offs between
synchronous template availability, custom-element connection, and
deferred initialization.
</p>
</div>
<table>
<thead>
<tr>
<th>Class</th>
<th>Append timing</th>
<th><code>ready()</code></th>
<th><code>oneTimeSetup()</code></th>