ts-optchain | Optional Chaining for TypeScript | Reactive Programming library
kandi X-RAY | ts-optchain Summary
kandi X-RAY | ts-optchain Summary
This project is now deprecated with Optional Chaining support included in TypeScript 3.7 and later.
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QUESTION
I am trying to write a set version of ts-optchain
. Where the functionality would attempt to return a copy of the root object with the spliced in change. Such that the original is not changed or modified in any way. Yet, for areas of the object that have not not been modified, they copied over into the shallow copy operation as references (via Object.assign(...)
).
My test that I am trying to validate for is as follows:
...ANSWER
Answered 2019-May-01 at 20:27The reason this happens is because only Proxies around functions may be called (and set the apply
trap). Your cast of {} as TSOSCType
masks the fact that what you're doing is impossible in runtime, and instructs TypeScript to trust you (wrongly).
Changing that statement to function(){} as unknown as TSOSCType
makes it work as expected.
As a general rule of thumb, whenever you get a runtime TypeError when using TypeScript, it means that TypeScript trusted you and you betrayed it. That almost always means a cast. When you get such errors, your casts should be the immediate suspects.
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