1 files changed, 6 insertions, 2 deletions
diff --git a/lib/internal/util/inspect.js b/lib/internal/util/inspect.js
index 9099c33e9e..9a1a0f9f03 100644
--- a/lib/internal/util/inspect.js
+++ b/lib/internal/util/inspect.js
@@ -516,10 +516,14 @@ function formatValue(ctx, value, recurseTimes, typedArray) {
         maybeCustom !== inspect &&
         // Also filter out any prototype objects using the circular check.
         !(value.constructor && value.constructor.prototype === value)) {
+      // Remove some internal properties from the options before passing it
+      // through to the user function. This also prevents option manipulation.
+      // eslint-disable-next-line no-unused-vars
+      const { budget, seen, indentationLvl, ...plainCtx } = ctx;
       // This makes sure the recurseTimes are reported as before while using
       // a counter internally.
       const depth = ctx.depth === null ? null : ctx.depth - recurseTimes;
-      const ret = maybeCustom.call(value, depth, ctx);
+      const ret = maybeCustom.call(value, depth, plainCtx);
 
       // If the custom inspection method returned `this`, don't go into
       // infinite recursion.
@@ -527,7 +531,7 @@ function formatValue(ctx, value, recurseTimes, typedArray) {
         if (typeof ret !== 'string') {
           return formatValue(ctx, ret, recurseTimes);
         }
-        return ret;
+        return ret.replace(/\n/g, `\n${' '.repeat(ctx.indentationLvl)}`);
       }
     }
   }