snapshot of https://github.com/tldraw/tldraw.git (main, 2026-09-23; blobs > 131072B omitted)

packages/sync-core/setupVitest.js

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+// IndexedDB polyfill for browser storage testing
+require('fake-indexeddb/auto')
+
+// ResizeObserver polyfill for DOM observation testing
+global.ResizeObserver = require('resize-observer-polyfill')
+
+// Crypto polyfill for cryptographic operations
+global.crypto ??= new (require('@peculiar/webcrypto').Crypto)()
+
+// FontFace API polyfill for font testing
+global.FontFace = class FontFace {
+	load() {
+		return Promise.resolve()
+	}
+}
+
+// Document fonts API mock
+document.fonts = {
+	add: () => {},
+	delete: () => {},
+	forEach: () => {},
+}
+
+// jsdom ships a global WebSocket built on its bundled copy of undici. In this jsdom test
+// environment its events are created in a different realm than the Node EventTarget they're
+// dispatched on, so connecting throws "The 'event' argument must be an instance of Event". Use
+// the `ws` package's WebSocket for client connections instead, matching the WebSocketServer the
+// tests connect to.
+global.WebSocket = require('ws').WebSocket
+
+// Window.matchMedia polyfill for media queries
+Object.defineProperty(window, 'matchMedia', {
+	writable: true,
+	value: (query) => ({
+		matches: false,
+		media: query,
+		onchange: null,
+		addListener: () => {},
+		removeListener: () => {},
+		addEventListener: () => {},
+		removeEventListener: () => {},
+		dispatchEvent: () => {},
+	}),
+})