mobx-keystone/src/utils/chainFns.ts

A MobX powered state management solution based on data trees with first class support for TypeScript, snapshots, patches and much more

export function chainFns<F extends Function>(...fns: (F | undefined)[]): F | undefined {
  const definedFns = fns.filter((fn) => !!fn)
  if (definedFns.length <= 0) {
    return undefined
  }

  const chainedFn = (v: any, ...args: any[]) => {
    let ret = v

    for (let i = 0; i < definedFns.length; i++) {
      ret = definedFns[i](ret, ...args)
    }

    return ret
  }

  return chainedFn as unknown as F
}