How call UFUNCTION (BlueprintImplementableEvent) from JS with EMSCRIPTEN and error: Module.ccall is not function?

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To work Module.ccall you need to export ccall function (add it to exported methods array) in Engine\Platforms\HTML5\Source\Programs\UnrealBuildTool\HTML5ToolChain.cs (~473 line):

Result += " -s EXPORTED_RUNTIME_METHODS=\"['stringToAscii', 'ccall']\"";