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There were missing process related typings at first. As I was adding them it turned out that getEventArgs and getEventSource return different types depending on the actual raised event. PowerApps documentation seems incomplete for many scenarios. I've mined next details through debugging:
I left any because there is some object with methods but they aren't documented anywhere.
Also getUrl isn't member of ExecutionContext. It is on the Page.
Generic ExecutionContext with additional type parameter for getEventArgs fits nice in type definitions. At the same time it brings breaking changes. Anyway I haven't found a way to make it backwards compatible.