All Travis builds fail with error TS7033

[NGL321]

🐛 Bug Report

What is the problem?

All builds fail on a random typescript example (the first to build) with this error:

node_modules/@aws-cdk/core/lib/stack.d.ts:425:17 - error TS7033: Property 'assetParameters' implicitly has type 'any', because its get accessor lacks a return type annotation.

425     private get assetParameters();
                    ~~~~~~~~~~~~~~~

RELATED TO: cdk#5497

Reproduction Steps

Attempt to build any current example in repo with latest CDK version.

Verbose Log

Environment

• CDK CLI Version:
• Example:
• Example Version:
• OS:
• Language:

Other information