[TS] initialized static readonly fields cause compile time errors when using TS 3.0 or earlier

[dclaux]

Platform and version

• TypeScript, any version

Details

TypeScript 3.1 introduced a breaking change in the way d.ts files are generated when it comes to static readonly fields on classes. Details here: https://twitter.com/bterlson/status/1059590186550476800?lang=en

This causes compile time issues for host apps that use TS 3.0 or earlier.

🎉AdaptiveCards@v1.2.3 has been released which fixes this issue.:tada:

Handy links:

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