CONTROL FREAK

tl;dr

Add it to your project:

yarn add @hmans/controlfreak

Write a module that composes and exports your game controller, eg controller.ts:

import {
  BooleanControl,
  Controller,
  GamepadDevice,
  KeyboardDevice,
  processors,
  TouchDevice,
  VectorControl
} from "@hmans/controlfreak"

export const controller = new Controller()

const keyboard = new KeyboardDevice()
const gamepad = new GamepadDevice()
const touch = new TouchDevice()

controller.addDevice(keyboard)
controller.addDevice(gamepad)
controller.addDevice(touch)

controller
  .addControl("move", VectorControl)
  .addStep(keyboard.compositeVector("KeyW", "KeyS", "KeyA", "KeyD"))
  .addStep(gamepad.axisVector(0, 1))
  .addStep(processors.clampVector(1))

controller
  .addControl("fire", BooleanControl)
  .addStep(keyboard.whenKeyPressed(["Space", "Enter"]))
  .addStep(gamepad.whenButtonPressed(0))

controller
  .addControl("aim", VectorControl)
  .addStep(
    keyboard.compositeVector("ArrowUp", "ArrowDown", "ArrowLeft", "ArrowRight")
  )
  .addStep(gamepad.axisVector(2, 3))
  .addStep(processors.normalizeVector)

controller.onDeviceChange.add((d) => console.log("new device:", d))

Then use it in your game loop:

import { controller } from "./controller"

/* Very likely within some sort of loop...: */
controller.update()
console.log(controller.controls.move.value)