lib: honor util.inspect breakLength Infinity

Author: Han5991

lib/internal/util/inspect.js

@@ -2022,7 +2022,14 @@ function formatError(err, constructor, tag, ctx, keys) {
   return stack;
 }
 
+function isUnlimitedDepth(ctx) {
+  return ctx.depth === null || ctx.depth === Infinity;
+}
+
 function groupArrayElements(ctx, output, value) {
+  if (!NumberIsFinite(ctx.breakLength) && isUnlimitedDepth(ctx)) {
+    return output;
+  }
   let totalLength = 0;
   let maxLength = 0;
   let i = 0;
@@ -2640,8 +2647,10 @@ function reduceToSingleString(
       // Consolidate all entries of the local most inner depth up to
       // `ctx.compact`, as long as the properties are smaller than
       // `ctx.breakLength`.
-      if (ctx.currentDepth - recurseTimes < ctx.compact &&
-          entries === output.length) {
+      const allowInline =
+        (!NumberIsFinite(ctx.breakLength) && isUnlimitedDepth(ctx)) ||
+        ctx.currentDepth - recurseTimes < ctx.compact;
+      if (allowInline && entries === output.length) {
         // Line up all entries on a single line in case the entries do not
         // exceed `breakLength`. Add 10 as constant to start next to all other
         // factors that may reduce `breakLength`.