Made of little things.

import type { Body } from './physics.js';
export type ReleaseMode = 0 | 1 | 2;
export const RELEASE_NAMES=['VOLLEY','STREAM','CLUSTERS'];

/** Selects physical cargo at a cadence; never clones, deletes or limits payload. */
export class Launcher {
  mode: ReleaseMode=0;
  private cooldown=0;
  private fireWas=false;
  setMode(mode: ReleaseMode): void { this.mode=mode;this.cooldown=0; }
  clear(): void { this.cooldown=0;this.fireWas=false; }
  tick(dt: number,fire: boolean,payload: Body[]): Body[] {
    this.cooldown=Math.max(0,this.cooldown-dt);
    const trigger=fire&&(this.mode!==0||!this.fireWas);this.fireWas=fire;
    if(!payload.length)return [];
    if(!trigger||this.cooldown>0)return [];
    const count=this.mode===0?payload.length:this.mode===1?1:5;
    const shot=payload.slice(0,count);this.cooldown=this.mode===1?.075:this.mode===2?.38:0;
    return shot;
  }
}