inferReturnType<F extends Function> function
- F fn
Enables precise type inference for function return types.
Acts as an identity function for functions, allowing the Dart analyzer to infer the specific return type of the passed function. This is particularly useful in reactive contexts where complex return types may be challenging for Dart's type system to infer accurately.
Usage
Use this function when you want to leverage Dart's type inference capabilities without explicitly declaring types, especially for complex return types.
Example:
// Without inferReturnType, type might be inferred as dynamic.
hello() => (name: "seven", age: 30);
// Without inferReturnType, violate lint rules
final hello = () => (name: "seven", age: 30);
// With inferReturnType:
final hello = inferReturnType(() => (name: "seven", age: 30));
// Specific return type is correctly inferred
By using inferReturnType, you can maintain code clarity and benefit from
precise type inference in your development environment without sacrificing
the advantages of Dart's type system.
Important
inferReturnType is effective when the return type is Record and is complex. It is not recommended for other types.
Implementation
F inferReturnType<F extends Function>(F fn) => fn;