fs.mkdirSync on app.synth raises EEXIST that should be safely ignored (never happened before)

[chneau]

Description of the bug:

When app.synth()ing, an error is raised if the folder already exists:

this line there:

Reproduction Steps:

synth twice so the first time the folder is created.

Error Log:

        ^
EEXIST: file already exists, mkdir 'dist'
    path: "dist",
 syscall: "mkdir",
   errno: -17,
    code: "EEXIST"

      at synth (/home/c/go/src/github.com/celerumltd/TLS-v4-pipeline/node_modules/cdk8s/lib/app.js:102:12)
(elided from there)

Environment:

• Framework Version:

  "dependencies": {
  	"@types/bun": "^1.1.17",
  	"cdk8s": "^2.69.33",
  	"cdk8s-plus-31": "^2.0.13",
  	"commander": "^13.0.0",
  	"dayjs": "^1.11.13",
  	"typescript": "^5.7.3"
  }

Bun version 1.1.44
Node version v23.6.0

• OS:

No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 12 (bookworm)
Release:        12
Codename:       bookworm

Other:

I wanted to be sure it's not coming from Bun so I did a simple test file:

import fs from "node:fs";

fs.mkdirSync("dist");

and this raise the same error both on Node and Bun.

As a workaround I monkey patch like this so it just continues execution of code. It never happened before with versions back to cdk8s-plus-29

import fs from "node:fs";

const original = fs.mkdirSync;
// @ts-expect-error
fs.mkdirSync = (
	path: fs.PathLike,
	options: fs.MakeDirectoryOptions & {
		recursive: true;
	},
) => {
	try {
		original(path, options);
	} catch (error) {
		console.log(error);
	}
};

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This is 🐛 Bug Report

[jrcichra]

I hit the same bug, I think it's a bun regression: oven-sh/bun#16497