# empty

The `CandidType` object `empty` corresponds to the Candid type empty, is inferred to be a TypeScript `never`, and has no JavaScript value at runtime.

TypeScript or JavaScript:

    import { Canister, empty, query } from 'azle';

    export default Canister({
        getEmpty: query([], empty, () => {
            throw 'Anything you want';
        }),
        // Note: It is impossible to call this function because it requires an argument
        // but there is no way to pass an "empty" value as an argument.
        printEmpty: query([empty], empty, (empty) => {
            console.log(typeof empty);
            throw 'Anything you want';
        })
    });

Candid:

    service : () -> {
        getEmpty : () -> (empty) query;
        printEmpty : (empty) -> (empty) query;
    }

dfx:

    dfx canister call candid_canister printEmpty '("You can put anything here")'
    Error: Failed to create argument blob.
    Caused by: Failed to create argument blob.
      Invalid data: Unable to serialize Candid values: type mismatch: "You can put anything here" cannot be of type empty