Charles Bochet
9dd097e11e
## Problem The GraphQL API playground (`/settings/playground/graphql/core`) crashes with: ``` Uncaught Error: Cannot read properties of undefined (reading 'toUrl') at FileAccessImpl.toUri (monaco-editor) at WorkerManager.getLanguageServiceWorker (graphqlMode) at DiagnosticsAdapter._doValidate (graphqlMode) ``` ## Root cause GraphiQL 5 (adopted in the React 19 migration, #21531) renders its editors with **Monaco** instead of CodeMirror. Monaco spawns web workers for GraphQL validation/autocomplete and needs a `globalThis.MonacoEnvironment.getWorker` factory. None was ever configured, so Monaco fell back to a main-thread worker whose URL resolves to `undefined` → the `toUrl` crash. ## Why not the official helper GraphiQL ships `@graphiql/react/setup-workers/vite`, but its bundled `?worker` imports are incompatible with our rolldown-based Vite setup: - **pre-bundled** (in `optimizeDeps`): esbuild's optimizer can't process `?worker` → the dep 504s and the page fails to load the chunk. - **excluded** from `optimizeDeps`: rolldown tries to load `editor.worker.js?worker` as a literal path → `UNLOADABLE_DEPENDENCY`, crashing the dev server. ## Fix - Register `MonacoEnvironment.getWorker` in **app source** (`setupGraphiqlMonacoWorkers.ts`), where Vite's worker plugin handles `?worker` reliably, and side-effect import it from `GraphQLPlayground.tsx` before GraphiQL mounts. - Align `monaco-editor` to `0.52.2` and add `monaco-graphql@1.8.0` as direct deps so the workers run on the **same deduped Monaco instance** GraphiQL uses on the main thread (a version mismatch would break the worker protocol). ## Verification Ran the playground locally against the dev server: - Editor renders, syntax highlighting works, operation name parses (GraphQL language service alive). - All three worker files (`editor`, `json`, `graphql`) load `200` and instantiate as module workers. - Console is free of `toUrl` / `Cannot read` errors and the "must define MonacoEnvironment.getWorker" warning. - `oxlint`, `oxfmt`, and `nx typecheck twenty-front` pass. <!-- This is an auto-generated description by cubic. --> <a href="https://cubic.dev/pr/twentyhq/twenty/pull/21620?utm_source=github" target="_blank" rel="noopener noreferrer" data-no-image-dialog="true"><picture><source media="(prefers-color-scheme: dark)" srcset="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://www.cubic.dev/buttons/review-in-cubic-light.svg"><img alt="Review in cubic" src="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"></picture></a> <!-- End of auto-generated description by cubic. -->
The #1 Open-Source CRM
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Why Twenty
Twenty gives technical teams the building blocks for a custom CRM that meets complex business needs and quickly adapts as the business evolves. Twenty is the CRM you build, ship, and version like the rest of your stack.
Learn more about why we built Twenty
Installation
Cloud
The fastest way to get started. Sign up at twenty.com and spin up a workspace in under a minute, with no infrastructure to manage and always up to date.
Build an app
Scaffold a new app with the Twenty CLI:
npx create-twenty-app my-app
Define objects, fields, and views as code:
import { defineObject, FieldType } from 'twenty-sdk/define';
export default defineObject({
nameSingular: 'deal',
namePlural: 'deals',
labelSingular: 'Deal',
labelPlural: 'Deals',
fields: [
{ name: 'name', label: 'Name', type: FieldType.TEXT },
{ name: 'amount', label: 'Amount', type: FieldType.CURRENCY },
{ name: 'closeDate', label: 'Close Date', type: FieldType.DATE_TIME },
],
});
Then ship it to your workspace:
npx twenty app:publish --private
See the app development guide for objects, views, agents, and logic functions.
Self-hosting
Run Twenty on your own infrastructure with Docker Compose, or contribute locally via the local setup guide.
Everything you need
Twenty gives you the building blocks of a modern CRM (objects, views, workflows, and agents) and lets you extend them as code. Here's a tour of what's in the box.
Want to go deeper? Read the 
User Guide for product walkthroughs, or the Documentation for developer reference.
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Stack
TypeScript
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NestJS, with BullMQ, 
PostgreSQL, 
Redis
React, with Jotai, Linaria and Lingui
Thanks
Thanks to these amazing services that we use and recommend for code review (Greptile), catching bugs (Sentry) and translating (Crowdin).
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