Typescript promise wrapper for s3.getSignedUrl with correct type definitions

getSignedUrl.ts

import { S3 } from 'aws-sdk';

const s3 = new S3();

interface GetSignedUrlExpires {
    /**
     * Number of seconds before the URL expires
     *
     * Defaults to `900`
     *
     * @type {number}
     * @memberof GetSignedUrlExpires
     */
    Expires?: number;
}
export type GetObjectParams = S3.GetObjectRequest & GetSignedUrlExpires;
export type PutObjectParams = S3.PutObjectRequest & GetSignedUrlExpires;

export async function getSignedUrl( operation: 'getObject', params: GetObjectParams ): Promise<string>;
export async function getSignedUrl( operation: 'putObject', params: PutObjectParams ): Promise<string>;
export async function getSignedUrl( operation: 'getObject' | 'putObject', params: GetObjectParams | PutObjectParams ): Promise<string> {
    return new Promise<string>( ( resolve, reject ) => {
        s3.getSignedUrl( operation, params, ( err, url ) => err ? reject( err ) : resolve( url ) );
    } );
}

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