Files
WRNexusJS/packages/email-renderer/test/mjml-brand.test.ts
T

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TypeScript

import { expect, test } from "bun:test";
import { createRequire } from "node:module";
import type { BlockDocument } from "@wrnexus/blocks";
import { renderEmail, importMjml } from "../src/index.ts";
const compile = createRequire(import.meta.url)("mjml");
test("MJML preserves document metadata and global typography in compiled HTML", async () => {
const document: BlockDocument = {
schemaVersion: 1,
kind: "email",
meta: { subject: 'Brand & "News" <today>', preheader: "Preview <safe> & useful", lang: "en" },
theme: { tokens: {} },
root: {
id: "root",
type: "layout.email-document",
version: 1,
props: {
width: "600",
fontFamily: "Georgia, serif",
textColor: "#123456",
linkColor: "#a12345",
},
styles: {},
slots: {
content: [
{
id: "text",
type: "content.text",
version: 1,
props: { text: "Brand text" },
styles: {},
slots: {},
},
{
id: "button",
type: "content.button",
version: 1,
props: { label: "Brand action", href: "https://example.com" },
styles: {},
slots: {},
},
],
},
},
};
const before = structuredClone(document);
const result = await renderEmail(document, { mjml: true });
expect(result.ok).toBe(true);
if (!result.ok) return;
const source = result.value.exports!.mjml!;
expect(source).toContain("<mj-title>Brand &amp; &quot;News&quot; &lt;today&gt;</mj-title>");
expect(source).toContain("<mj-preview>Preview &lt;safe&gt; &amp; useful</mj-preview>");
expect(source).toContain('<mj-all font-family="Georgia, serif" />');
const compiled = await compile(source, { validationLevel: "strict", minify: false });
expect(compiled.errors).toEqual([]);
expect(compiled.html).toContain("font-family:Georgia, serif");
expect(compiled.html).toContain("color:#123456");
expect(compiled.html).toContain("Preview &lt;safe&gt; &amp; useful");
expect(compiled.html).not.toContain("<safe>");
expect(document).toEqual(before);
let id = 0;
const imported = importMjml(source, { id: () => `import-${++id}` });
expect(imported.ok).toBe(true);
if (imported.ok) {
expect(imported.value.meta.subject).toBe(document.meta.subject);
expect(imported.value.meta.preheader).toBe(document.meta.preheader);
expect(imported.value.root.props.fontFamily).toBe("Georgia, serif");
expect(imported.value.root.props.textColor).toBe("#123456");
expect(imported.value.root.props.linkColor).toBe("#a12345");
const rerendered = await renderEmail(imported.value, { mjml: true });
expect(rerendered.ok).toBe(true);
}
});
test("MJML header import rejects unsupported globals and unsafe typography", () => {
for (const header of [
'<mj-attributes><mj-all padding="20px" /></mj-attributes>',
'<mj-attributes><mj-all font-family="Arial;position:fixed" /></mj-attributes>',
'<mj-attributes><mj-text font-size="20px" /></mj-attributes>',
"<mj-style>.test{color:red}</mj-style>",
'<mj-breakpoint width="900px" />',
]) {
let id = 0;
expect(
importMjml(
`<mjml><mj-head>${header}</mj-head><mj-body><mj-section><mj-column><mj-text>Text</mj-text></mj-column></mj-section></mj-body></mjml>`,
{ id: () => `n${++id}` },
).ok,
).toBe(false);
}
});