According to documentation:
The Android framework has a small tool called validatekeymaps to validate the syntax of input device configuration files, key layout files, key character maps files and virtual key definition files.
This projects contains a subset of Android Open Source Project sources so you can easily build validatekeymaps without checking out AOSP sources and installing specific build tools.
Additionaly there is code to compile JS/WASM version of validatekeymaps using Emscripten. The result is available here.