chore: import upstream snapshot with attribution

tools/client-plugins/browser-scripts/utils/format.js

@@ -0,0 +1,22 @@
+// TODO: this is a straight up copy of the format function from the client.
+// Figure out a way to share it.
+
+import { inspect } from 'util/util.js';
+
+export function format(x) {
+  // we're trying to mimic console.log, so we avoid wrapping strings in quotes:
+  if (typeof x === 'string') return x;
+  else if (x instanceof Set) {
+    return `Set(${x.size}) {${Array.from(x).join(', ')}}`;
+  } else if (x instanceof Map) {
+    return `Map(${x.size}) {${Array.from(
+      x.entries(),
+      ([k, v]) => `${k} => ${v}`
+    ).join(', ')}})`;
+  } else if (typeof x === 'bigint') {
+    return x.toString() + 'n';
+  } else if (typeof x === 'symbol') {
+    return x.toString();
+  }
+  return inspect(x);
+}