add processing start / end events

apps/cli/src/shared/prefix-logger.ts

@@ -0,0 +1,26 @@
+// create a PrefixLogger class that wraps console.log with a prefix
+// and allows chaining with a parent logger
+export class PrefixLogger {
+    private prefix: string;
+    private parent: PrefixLogger | null;
+
+    constructor(prefix: string, parent: PrefixLogger | null = null) {
+        this.prefix = prefix;
+        this.parent = parent;
+    }
+
+    log(...args: any[]) {
+        const timestamp = new Date().toISOString();
+        const prefix = '[' + this.prefix + ']';
+
+        if (this.parent) {
+            this.parent.log(prefix, ...args);
+        } else {
+            console.log(timestamp, prefix, ...args);
+        }
+    }
+
+    child(childPrefix: string): PrefixLogger {
+        return new PrefixLogger(childPrefix, this);
+    }
+}