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packages/@n8n/ai-workflow-builder.ee/evaluations/harness/logger.ts

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+import pc from 'picocolors';
+
+/**
+ * Simple evaluation logger with verbose mode support.
+ *
+ * Usage:
+ *   const log = createLogger(isVerbose);
+ *   log.info('Always shown');
+ *   log.verbose('Only shown in verbose mode');
+ */
+
+export interface EvalLogger {
+	/** Always shown - important info */
+	info: (message: string) => void;
+	/** Only shown in verbose mode - debug details */
+	verbose: (message: string) => void;
+	/** Success messages (green) */
+	success: (message: string) => void;
+	/** Warning messages (yellow) */
+	warn: (message: string) => void;
+	/** Error messages (red) */
+	error: (message: string) => void;
+	/** Dimmed text for secondary info */
+	dim: (message: string) => void;
+	/** Check if verbose mode is enabled */
+	isVerbose: boolean;
+}
+
+export function createLogger(verbose: boolean = false): EvalLogger {
+	return {
+		isVerbose: verbose,
+		// Keep info plain so lifecycle can apply its own formatting without double-coloring.
+		info: (message: string) => console.log(message),
+		verbose: (message: string) => {
+			if (verbose) console.log(pc.dim(message));
+		},
+		success: (message: string) => console.log(pc.green(message)),
+		warn: (message: string) => console.warn(pc.yellow(message)),
+		error: (message: string) => console.error(pc.red(message)),
+		dim: (message: string) => console.log(pc.dim(message)),
+	};
+}