Pulumi Node.js SDK supports Bun as a runtime

Introduced 2026-03-12 · score 0.94

HOW TO USE IT

When the Pulumi CLI is v3.226.0 or later and the repository should use Bun, set `runtime: bun` in `Pulumi.yaml`; Bun runtime does not support function serialization.

WHY THIS HELPS

Run a Pulumi TypeScript or Node.js SDK program in a repository configured to use Bun.

REQUIREMENTS AND LIMITATIONS

• Version: 3.226.0
• runtime (required): Set to `bun` to select the Bun runtime.
• Prerequisite: Use Pulumi CLI 3.226.0 or later and install Bun; the v3.226.0 source implements a minimum `@pulumi/pulumi` SDK check of 3.226.0 for Bun.
• Function serialization is not supported in Bun.
• Docs conflict: Current Pulumi TypeScript docs say Bun is first-class as of Pulumi 3.227.0; the v3.226.0 release source includes Bun runtime support. The current docs describe newer-version behavior.

FIRST-PARTY EVIDENCE

• https://github.com/pulumi/pulumi/releases/tag/v3.226.0
• https://github.com/pulumi/pulumi/pull/22049
• https://github.com/pulumi/pulumi/pull/22177
• https://github.com/pulumi/pulumi/blob/v3.226.0/sdk/nodejs/cmd/pulumi-language-nodejs/testdata/published/bun/projects/l1-builtin-can/Pulumi.yaml
• https://www.pulumi.com/docs/iac/languages-sdks/javascript/
• https://github.com/pulumi/pulumi/blob/v3.226.0/sdk/nodejs/cmd/pulumi-language-nodejs/main.go

Check the installed version and the source before using it. Entry JSON

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