Why does the code snippet below not result in a type error being thrown?
const fn1 = (arg1: { key: number }) => {
console.log(arg1);
}
// This call works as expected
fn1({ key: 1 });
// However, this call does not produce a type error
fn1({ key: 1, a: 1 });
I've spent some time going through the TypeScript documentation and searching on Google but I'm still puzzled by this behavior!
In Typescript, errors are not thrown when the input type is a minimum requirement rather than a precise one. For instance, if you provide an object like { key: 1, a: 1 }, there will be no error because it includes the necessary key property.
However, if you omit the key property as in { a: 1 }, an error will be triggered since it does not meet the minimum requirement.
To enforce strict checking and trigger errors in such cases, consider using classes or interfaces instead.
class ExampleClass {
constructor(readonly key: number) {}
}
interface ExampleInterface {
key: number;
}
const fn1 = (arg1: ExampleClass | ExampleInterface) => {
console.log(arg1);
}
// This will now result in a TypeScript error
fn1({ key: 1, a: 1 });
// But these examples won't trigger any errors
fn1(new ExampleClass(1));
fn1({ key: 1 });
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