startVitest + browser mode crashing with Vitest received --browser flag, but no project had a browser configuration. #9801
Description
Describe the bug
Running browser mode via Node API without projects crashes. Adding projects fixes it.
import { startVitest } from "vitest/node";
import { playwright } from "@vitest/browser-playwright";
const vitest = await startVitest("test", [], {
browser: {
enabled: true,
headless: true,
provider: playwright(),
instances: [{ browser: "chromium" }],
},
});
await vitest.close();$ node index.mjs
file:///x/repros/vitest-browser-name/node_modules/.pnpm/vitest@4.0.18_@vitest+browser-playwright@4.0.18/node_modules/vitest/dist/chunks/cli-api.B7PN_QUv.js:12238
if (!this.projects.filter((p) => p.config.browser.enabled).length) throw new Error(`Vitest received --browser flag, but no project had a browser configuration.`);
^
Error: Vitest received --browser flag, but no project had a browser configuration.
at Vitest._setServer (file:///x/repros/vitest-browser-name/node_modules/.pnpm/vitest@4.0.18_@vitest+browser-playwright@4.0.18/node_modules/vitest/dist/chunks/cli-api.B7PN_QUv.js:12238:77)
at BasicMinimalPluginContext.handler (file:///x/repros/vitest-browser-name/node_modules/.pnpm/vitest@4.0.18_@vitest+browser-playwright@4.0.18/node_modules/vitest/dist/chunks/cli-api.B7PN_QUv.js:13158:6)
at _createServer (file:///x/repros/vitest-browser-name/node_modules/.pnpm/vite@7.3.1/node_modules/vite/dist/node/chunks/config.js:25603:86)
at createViteServer (file:///x/repros/vitest-browser-name/node_modules/.pnpm/vitest@4.0.18_@vitest+browser-playwright@4.0.18/node_modules/vitest/dist/chunks/cli-api.B7PN_QUv.js:9870:17)
at createVitest (file:///x/repros/vitest-browser-name/node_modules/.pnpm/vitest@4.0.18_@vitest+browser-playwright@4.0.18/node_modules/vitest/dist/chunks/cli-api.B7PN_QUv.js:13186:17)
at prepareVitest (file:///x/repros/vitest-browser-name/node_modules/.pnpm/vitest@4.0.18_@vitest+browser-playwright@4.0.18/node_modules/vitest/dist/chunks/cli-api.B7PN_QUv.js:13548:14)
at startVitest (file:///x/repros/vitest-browser-name/node_modules/.pnpm/vitest@4.0.18_@vitest+browser-playwright@4.0.18/node_modules/vitest/dist/chunks/cli-api.B7PN_QUv.js:13494:14)
at file:///x/repros/vitest-browser-name/index.mjs:4:16
Node.js v22.22.0Reproduction
https://stackblitz.com/~/edit/vitest-dev-vitest-pohf9wmu?file=index.mjs&initialPath=/__vitest__/
System Info
StackblitzUsed Package Manager
pnpm
Validations
- Follow our Code of Conduct
- Read the Contributing Guidelines.
- Read the docs.
- Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
- Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
- The provided reproduction is a minimal reproducible example of the bug.