Ts-morph: Cannot get properties of complex type

[aspirisen]

Describe the bug
I have a complex type where i can pass some "selection" to a function and this function will return subset type:
From https://stackoverflow.com/a/51968630/3021445

interface Data {
  one: string;
  two: number;
  three: {
    four: string;
    five: {
      six: Date;
    };
  };
}

declare const data: Data;

const result = select(data, { one: true, three: { five: { six: true } } }); 
// Here the "result" variable type will have all fields except "two" and "four"

I need to get "result" variable fields, but for some reason when i try to get type of "three" variable it becomes "any" type.

Version: 11.0.0

To Reproduce

I create codesandbox where you can play
https://codesandbox.io/s/goofy-diffie-owje4?file=/src/utils.ts:1470-1527

Expected behavior

I am able to get correct type object for complex types

[dsherret]

Do you get any diagnostics when calling project.getPreEmitDiagnostics()?

[aspirisen]

@dsherret i have empty array

[dsherret]

@aspirisen sorry, I didn't see the all the files in the code sandbox. I will take a look at this soon.

[dsherret]

@aspirisen ok, I'm not 100% sure what the correct way to use the typescript compiler API is, but I believe you need to use:

prop.getTypeAtLocation(declaration)

And always provide the node where the type node exists... for example do:

if (Node.isFunctionLikeDeclaration(declaration)) {
    const [param] = declaration.getParameters();
    const selection = getFieldSelection(param); // do param.getType() inside getFieldSelection
    return selection;
  }
}

...and always provide param to prop.getTypeAtLocation(param) within getFieldSelection. I have something very rough here: https://codesandbox.io/s/determined-liskov-4xk8c?file=/src/index.ts:40-115

[aspirisen]

@dsherret that's strange that what i tried didn't work correctly, it was able to get first level of type properties, but couldn't get nested properties.

Anyway, your solution works perfectly, thank you very much for help!