util: use minimal object inspection with %s specifier

This improves `util.format()` by returning more meaningful results
when using `%s` as specifier and any object as value. Besides that
`BigInt` will also be represented with an `n` at the end to indicate
that it's of type `BigInt`.

PR-URL: https://github.com/nodejs/node/pull/26927
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/lib/internal/util/inspect.js b/lib/internal/util/inspect.js
index 52924a4f70..f25c2eaca7 100644
--- a/lib/internal/util/inspect.js
+++ b/lib/internal/util/inspect.js
@@ -1446,7 +1446,20 @@ function formatWithOptions(inspectOptions, ...args) {
         if (a + 1 !== args.length) {
           switch (nextChar) {
             case 115: // 's'
-              tempStr = String(args[++a]);
+              const tempArg = args[++a];
+              if (typeof tempArg === 'object' && tempArg !== null) {
+                tempStr = inspect(tempArg, {
+                  ...inspectOptions,
+                  compact: 3,
+                  colors: false,
+                  depth: 0
+                });
+              // eslint-disable-next-line valid-typeof
+              } else if (typeof tempArg === 'bigint') {
+                tempStr = `${tempArg}n`;
+              } else {
+                tempStr = String(tempArg);
+              }
               break;
             case 106: // 'j'
               tempStr = tryStringify(args[++a]);