Dermot Duffy
ea251ca988
Closes #2531. ## Summary The full `nunjucks` templating engine (~226KB) plus `ha-nunjucks` (~46KB) — roughly **272KB, ~13% of the eager entry chunk** — was statically imported and downloaded by every card on initial load, even though templates only apply when a config value contains a `{{ … }}` / `{% … %}` delimiter. Most cards use no templates and never need the engine. This defers the engine behind a dynamic `import('ha-nunjucks/dist')` so it ships in a separate, on-demand chunk instead of the eager `card-*.js`. ## Approach The render path (`TemplateRenderer.renderRecursively`) is **kept synchronous** — it is called from many synchronous hot paths (condition/trigger evaluators, picture-elements rendering, actions, folder matchers), and making it async would be a large, high-risk refactor of the evaluation core. Instead: - **New `src/card-controller/templates/engine.ts`** — a module-level singleton lazy loader (`loadTemplateEngine()` / `getTemplateEngine()`) shared across all `TemplateRenderer` instances, plus a `containsTemplate()` delimiter helper. - **Delimiter gating** — strings without a delimiter never touch the engine (the overwhelming majority of renders). - **Pre-warm at config time** — because every template string originates in the config, a new mandatory `TEMPLATE_ENGINE` initialization aspect loads the engine before first render whenever the config contains a delimiter. This **guarantees no raw `{{ … }}` flash**: content/condition rendering is blocked until the engine is present for template-using cards. Cards without templates never load it. ## Result - nunjucks + ha-nunjucks move out of the eager chunk into a separate chunk fetched only when a card actually uses templates. - No change to the synchronous public render API; condition/trigger evaluation core untouched. ## Tests - New `engine.ts` loader coverage (concurrent load, cached reuse, not-loaded fallback). - The 11 existing test files that render real (delimiter-bearing) templates declare their dependency explicitly via `beforeAll(loadTemplateEngine)` — no global/implicit setup hook. - Full suite green (4764 tests), lint and ts-prune clean, per-file 100% coverage maintained for the affected directories. 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_016ykWemdkZrgywvC71pHc6c --- _Generated by [Claude Code](https://claude.ai/code/session_016ykWemdkZrgywvC71pHc6c)_
33 lines
1.2 KiB
TypeScript
33 lines
1.2 KiB
TypeScript
import { describe, expect, it, vi } from 'vitest';
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import { mock } from 'vitest-mock-extended';
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import type { TemplateRenderer } from '../../../src/card-controller/templates/index';
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import {
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getTemplateRendererViaEvent,
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type TemplateRendererGetEvent,
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} from '../../../src/card-controller/templates/renderer-via-event';
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// @vitest-environment jsdom
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describe('getTemplateRendererViaEvent', () => {
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it('should dispatch event and retrieve template renderer', () => {
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const element = document.createElement('div');
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const templateRenderer = mock<TemplateRenderer>();
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const handler = vi.fn().mockImplementation((ev: TemplateRendererGetEvent) => {
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ev.templateRenderer = templateRenderer;
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});
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element.addEventListener('advanced-camera-card:template-renderer:get', handler);
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expect(getTemplateRendererViaEvent(element)).toBe(templateRenderer);
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});
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it('should return null when no template renderer is provided', () => {
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const element = document.createElement('div');
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const handler = vi.fn();
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element.addEventListener('advanced-camera-card:template-renderer:get', handler);
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expect(getTemplateRendererViaEvent(element)).toBeNull();
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});
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});
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