diff --git a/.changeset/nice-chairs-mix.md b/.changeset/nice-chairs-mix.md
new file mode 100644
index 00000000..ebf154ca
--- /dev/null
+++ b/.changeset/nice-chairs-mix.md
@@ -0,0 +1,5 @@
+---
+'wmr': minor
+---
+
+Adds resource fetch shim for prererendering
diff --git a/packages/wmr/src/lib/prerender.js b/packages/wmr/src/lib/prerender.js
index a5283b8b..9f5297ca 100644
--- a/packages/wmr/src/lib/prerender.js
+++ b/packages/wmr/src/lib/prerender.js
@@ -96,6 +96,12 @@ async function workerCode({ cwd, out, publicPath, customRoutes }) {
let head = { lang: '', title: '', elements: new Set() };
globalThis.wmr = { ssr: { head } };
+ // @ts-ignore
+ globalThis.fetch = async url => {
+ const text = () => fs.readFile(`${out}/${String(url).replace(/^\//, '')}`, 'utf-8');
+ return { text, json: () => text().then(JSON.parse) };
+ };
+
// Prevent Rollup from transforming `import()` here.
const $import = new Function('s', 'return import(s)');
const m = await $import('file:///' + script);
diff --git a/packages/wmr/test/fixtures/prerender-resource-fetch/content.md b/packages/wmr/test/fixtures/prerender-resource-fetch/content.md
new file mode 100644
index 00000000..2be7c65a
--- /dev/null
+++ b/packages/wmr/test/fixtures/prerender-resource-fetch/content.md
@@ -0,0 +1 @@
+# hello world
diff --git a/packages/wmr/test/fixtures/prerender-resource-fetch/index.html b/packages/wmr/test/fixtures/prerender-resource-fetch/index.html
new file mode 100644
index 00000000..d2c9fb7d
--- /dev/null
+++ b/packages/wmr/test/fixtures/prerender-resource-fetch/index.html
@@ -0,0 +1,10 @@
+
+
+
+
+ default title
+
+
+
+
+
diff --git a/packages/wmr/test/fixtures/prerender-resource-fetch/index.js b/packages/wmr/test/fixtures/prerender-resource-fetch/index.js
new file mode 100644
index 00000000..f0ec977f
--- /dev/null
+++ b/packages/wmr/test/fixtures/prerender-resource-fetch/index.js
@@ -0,0 +1,4 @@
+export async function prerender() {
+ const md = await fetch('content.md').then(res => res.text());
+ return { html: md, links: ['/'] };
+}
diff --git a/packages/wmr/test/production.test.js b/packages/wmr/test/production.test.js
index 8a0f4752..c2622628 100644
--- a/packages/wmr/test/production.test.js
+++ b/packages/wmr/test/production.test.js
@@ -878,6 +878,17 @@ describe('production', () => {
expect(instance.output.join('\n')).toMatch(/The following error was thrown during prerendering/i);
});
});
+
+ it('should support fetching resources from disk during prerender', async () => {
+ await loadFixture('prerender-resource-fetch', env);
+ instance = await runWmr(env.tmp.path, 'build', '--prerender');
+ const code = await instance.done;
+ expect(code).toBe(0);
+
+ const indexHtml = path.join(env.tmp.path, 'dist', 'index.html');
+ const index = await fs.readFile(indexHtml, 'utf8');
+ expect(index).toMatch(/# hello world/);
+ });
});
describe('Code Splitting', () => {