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

apps/mcp-app/src/logger.ts

@@ -0,0 +1,45 @@
+/**
+ * Structured logger for the tldraw MCP Durable Object.
+ *
+ * Outputs JSON lines to console.error so that
+ * Cloudflare Workers Observability can capture and query them.
+ */
+
+export class Logger {
+	constructor(
+		private prefix: string,
+		private enabled: boolean
+	) {}
+
+	info(message: string, data?: Record<string, unknown>) {
+		if (!this.enabled) return
+		console.error(
+			JSON.stringify({ level: 'info', prefix: this.prefix, message, ...data, ts: Date.now() })
+		)
+	}
+
+	error(message: string, data?: Record<string, unknown>) {
+		if (!this.enabled) return
+		console.error(
+			JSON.stringify({ level: 'error', prefix: this.prefix, message, ...data, ts: Date.now() })
+		)
+	}
+
+	debug(message: string, data?: Record<string, unknown>) {
+		if (!this.enabled) return
+		console.error(
+			JSON.stringify({ level: 'debug', prefix: this.prefix, message, ...data, ts: Date.now() })
+		)
+	}
+
+	child(prefix: string): Logger {
+		return new Logger(`${this.prefix}:${prefix}`, this.enabled)
+	}
+
+	/** Returns a log function compatible with RegisterToolsOptions.log */
+	toLogFn(): (...args: unknown[]) => void {
+		return (...args: unknown[]) => {
+			this.info(args.map(String).join(' '))
+		}
+	}
+}