Fix durable workflow imports with Yarn PnP

[wengkhing]

Problem

SST Workflow applications can fail before synthesis under Node 22 and Yarn PnP when a config imports a module that imports sst/aws/workflow.

The durable SDK ESM entrypoint statically imports named exports from the CommonJS @aws-sdk/client-lambda package. Yarn PnP exposes that package through a CommonJS loader, so Node rejects the import before SST can evaluate the config:

SyntaxError: Named export `CheckpointDurableExecutionCommand` not found

This blocks sst diff, sst deploy, and sst dev for otherwise valid durable workflow applications.

Fix

Load the durable SDK through Node createRequire() while retaining type-only imports. This selects the SDK CommonJS entrypoint, which works with Yarn PnP and preserves the existing durable SDK version and SST workflow API.

Testing

• bun run typecheck:sdk
• bun run build:sdk
• Node 22 ESM import of sst/aws/workflow