Typescript Conditional Return Type
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Typescript Conditional Return Type
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Typescript Conditional Types YouTube
Web Feb 15 2018 nbsp 0183 32 1 Answer Typescript will not infer different return types based on type guards in the function You can however define multiple function signatures for let the compiler know the links between input parameter types and result type function ff x boolean boolean function ff x string string Implementation signature not publicly If your function uses conditional types in the return it will need to use type assertions, as typescript will not try to reason about the conditional type since it contains a free type parameter: function dependsOnParameter<B extends boolean>(x: B): B extends true ? number : string { if (x) { return 3 as any; } else { return "string"as any; } }
Type Level TypeScript Code Branching With Conditional Types
Typescript Conditional Return Type;Conditional types are defined as follows: type ConditionalType = SomeType extends OtherType ? TrueType : FalseType In plain English, the definition above would be as follows: If a given type SomeType extends another given type OtherType, then ConditionalType is TrueType, otherwise it is FalseType. Web Jun 1 2018 nbsp 0183 32 TypeScript How to write a function with conditional return type export type Name name string export type Id id number export type Value lt T gt T extends string Name Id export function create lt T extends string number gt value T Value lt T gt if typeof value quot string quot return name value return id value I am
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TypeScript Conditional Types