Bun: CDK Issue Reproduction

Minimal reproduction of CDK issue in Bun introduced after Bun version 1.0.8. This issue occurs when calling any cdk command, e.g. bun cdk synth.

❗️ This has been fixed from version v1.1.20 and onwards.

• Latest known working version: 1.0.8 (curl -fsSL https://bun.sh/install | bash -s "bun-v1.0.8")
• Tested with latest release as of 6th of Jan, 2024: 1.0.21 (and all version in-between)
• Fixed in version v1.1.20 (tested with the canary from bun#8021)

First clone this repository and install dependencies:

$ git clone [email protected]:codetalkio/bun-issue-cdk-repro.git
$ cd bun-issue-cdk-repro/app
$ bun --revision
1.0.21+837cbd60d
$ bun install
...

The run bun cdk synth while still in the bun-issue-cdk-repro/app directory:

$ bun run cdk synth
cdk synth

Subprocess exited with error null
error: script "cdk" exited with code 1 (SIGHUP)

Initial Setup

We simply follow the CDK Getting Started Guide to create a new CDK project.

$ mkdir app
$ cd app
$ bunx cdk init app --language typescript

which creates our scaffold.

We now change app/cdk.json to use bun instead of npx + ts-node:

-  "app": "npx ts-node --prefer-ts-exts bin/app.ts",
+  "app": "bun bin/app.ts",

We remove package-lock.json and node_modules, and reinstall dependencies with bun:

$ rm app/package-lock.json
$ rm -r app/node_modules
$ cd app
$ bun install

Reproduction

You can now run any cdk command such as bun cdk synth and it will fail with Subprocess exited with error null:

$ cd bun-issue-cdk-repro/app
$ bun --revision
1.0.21+837cbd60d
$ bun run cdk synth
cdk synth

Subprocess exited with error null
error: script "cdk" exited with code 1 (SIGHUP)

$ echo $?
1

If you install bun version 1.0.8 and run bun cdk synth it will work as expected.

$ cd bun-issue-cdk-repro/app
$ bun --revision
1.0.8+2a405f691e80725fe0b97b93afd3b8cfed13fa5f
$ bun run cdk synth
cdk synth
Resources:
  CDKMetadata:
    Type: AWS::CDK::Metadata
    Properties:
      Analytics: v2:deflate64:H4sIAAAAAAAA/zPSMzS00DNQTCwv1k1OydbNyUzSqw4uSUzO1nFOywtKLc4vLUpOBbGd8/NSMksy8/NqdfLyU1L1sor1y4wM9ECas4ozM3WLSvNKMnNT9YIgNADUwEUzWQAAAA==
    Metadata:
      aws:cdk:path: AppStack/CDKMetadata/Default
    Condition: CDKMetadataAvailable
Conditions:
  CDKMetadataAvailable:
    Fn::Or:
      - Fn::Or:
...

$ echo $?
0