Microsoft/TypeScript

"Did you mean parent object or child property?" in error messsages

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#35 738 ouverte le 17 déc. 2019

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Domain: Error MessagesEffort: ModerateExperience EnhancementHelp WantedSuggestion

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Description

Discussed with @RyanCavanaugh from his personal dev experience.

It's common to get an error message when accidentally using an inner property of an object. Similarly, we might forget to actually fetch an inner property of an object.

// @strict: true

interface Person {
  residence: House;
}

interface House {
  isHouseOfPain: boolean;
}

declare let home: House;
declare let person: Person;

   home = person.residence.isHouseOfPain;
// ~~~~
// error: Type 'boolean' is not assignable to type 'House'.

   home = person;
// ~~~~
// error: Property 'isHouseOfPain' is missing in type 'Person' but required in type 'House'.
//   related: 'isHouseOfPain' is declared here.

It'd be nice if we could hint to the user "hey, you might have dotted too far into this object" or "hey, did you mean to grab the residence property?"

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