@types/express dependency is missing in apollo-server package

[Grmiade]

When we try to generate our TS code without skipLibCheck, we have this error: Could not find a declaration file for module 'express'
The .d.ts file generated by https://github.com/apollographql/apollo-server/blob/main/packages/apollo-server/src/index.ts needs @types/express.
We should declare @types/express as dependency in the apollo-server package.

/// <reference types="node" />
import express from 'express';
import http from 'http';
import { ApolloServer as ApolloServerExpress, CorsOptions, ApolloServerExpressConfig } from 'apollo-server-express';
export * from './exports';
export interface ServerInfo {
    address: string;
    family: string;
    url: string;
    port: number | string;
    server: http.Server;
}
export declare class ApolloServer extends ApolloServerExpress {
    private cors;
    private onHealthCheck;
    private healthCheckPath;
    private httpServer;
    constructor(config: ApolloServerExpressConfig & {
        cors?: CorsOptions | boolean;
        onHealthCheck?: (req: express.Request) => Promise<any>;
        healthCheckPath?: string | null;
        stopGracePeriodMillis?: number;
    });
    private createServerInfo;
    applyMiddleware(): void;
    start(): Promise<void>;
    listen(...opts: Array<any>): Promise<ServerInfo>;
}
//# sourceMappingURL=index.d.ts.map

[glasser]

I think that's right, since express.Request is in the API. Will fix along with your other concerns.
(This stuff is all much simpler on version-4 where we don't have a zillion separate packages.)