Explaining the functionality of reserved words like 'delete' within a d.ts file is essential for understanding their

I am currently in the process of generating a d.ts file for codebooks.io, where I need to define the function delete as an exported top-level function.

This is what my codebooks-js.d.ts file looks like at the moment:

declare module "codehooks-js" {
    export type Method = 'GET' | 'HEAD' | 'POST' | 'PUT' | 'DELETE' | 'CONNECT' | 'OPTIONS' | 'TRACE' | 'PATCH' 

    export type RequestObject = {
        headers: Object,
        query: Object,
        params: Object,
        body: any,
        path: string,
        apipath: string,
        originalUrl: string,
        method: Method,
        hostname: string,
    }

    export type ResponseObject = {
        set: (header: string, value: string) => void,
        headers: (object: Object) => void,
        status: (httpStatusCode: number) => void,
        json: (object: Object) => void,
        write: (data: string | unknown) => void,
        send: (data: string) => void,
        end: () => void,
    }

    export type Next = () => void

    export type Callback = (request: RequestObject, response: ResponseObject, next: Next) => void

    export function init(): void
    export function use(callback: Callback): void
    export function get(route: string): void
    export function get(route: string, callback: Callback): void
    export function post(route: string, callback: Callback): void
    export function put(route: string, callback: Callback): void
    export function patch(route: string, callback: Callback): void

    // encountering a problem here
    export function delete(route: string, callback: Callback): void
}

An error from TypeScript has occurred:

Identifier expected. 'delete' is a reserved word that cannot be used here.ts(1359)

I tried using @ts-expect-error, but it does not seem to have any effect in a d.ts file. What should I do to resolve this issue?

Answer №1

To change the name of exports in a TypeScript module using an export statement, you can do so like this:

export { internalName as externalName }
. The good news is that you can use `delete` for renaming without any issues, as it is not considered a reserved keyword in this case.

function _delete(route: string, callback: Callback): void;
export { _delete as delete } // no error

Check out this Playground link to code

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