NaridaL

export type KeysToTrue<T> = {
  [P in Key<T>]: true;
}

export type Key<T> = keyof T

export type Mapping<T, S> = {
  [P in Key<T>]: S
}

NaridaL

declare module 'express-session' {
    import express = require('express');
    import node = require('events');

    function session(options?: session.SessionOptions): express.RequestHandler;

    namespace session {
        export interface SessionOptions {
            secret: string;
            name?: string;

NaridaL

// A.ts
abstract class A {

    public static create(t: boolean) {
        //noinspection TsLint
        const b = new D();
        return t ? new B() : new C();
    }

    abstract foo(): string

NaridaL

// A.ts
abstract class A {

    public static create(t: boolean) {
        //noinspection TsLint
        const b = new D();
        return t ? new B() : new C();
    }

    abstract foo(): string