Error encountered in Typescript when handling fetch options as a variable

Why does this code compile perfectly?

fetch('someurl', {
    method: 'GET',
    credentials:"same-origin"
})

However, the following code throws a compilation error for fetch('someurl', init);

const init = {
    method: 'GET',
    credentials: "same-origin"
};

fetch('someurl', init);

What could be the reason behind this discrepancy?

Explore the code here

Answer №1

The issue stems from the type declaration.

In the initial scenario, an object of type RequestInit is being initialized. However, in the subsequent situation, a const of an unspecified type is declared:

{
    method: string;
    credentials: string;
}

This discrepancy is what is causing the problem at hand.

To rectify this, ensure that the type for initialization is set to RequestInit.

You can view the corrected version here.

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