@nullvoxpopuli/ember-composable-helpers/src/helpers/call.ts

Composable helpers for Ember

/**
 * @deprecated since ember 3.25 (with polyfill) and ember 4.5, this utility is not needed as functions can be directly invoked
 *
 * Calls a function passed within a template and returns its value.
 * In order to pass arguments to the function being called, you must
 * curry the function using the `fn` helper.
 *
 ```example
    <div data-metrics={{call (fn this.myMetrics (hash item=@item))}}
  ```
 *
 * @function apply
 * @param fn The function to be called
 * @param thisArg An optional `this` context
 */
export function call<ThisArg, Fn extends (this: ThisArg) => unknown>([
  fn,
  thisArg,
]: [fn: Fn, thisArg: ThisArg]): ReturnType<Fn>;
export function call<Fn extends (this: never) => unknown>([fn]: [
  fn: Fn,
]): ReturnType<Fn>;
export function call([fn, thisArg]: [fn?: undefined, thisArg?: unknown]): void;
export function call([fn, thisArg]: [
  fn?: (() => unknown) | undefined,
  thisArg?: unknown,
]): unknown {
  if (fn) {
    if (thisArg) {
      return fn.apply(thisArg);
    } else {
      return fn();
    }
  }
}

export default function callHelper<
  ThisArg,
  Fn extends (this: ThisArg) => unknown,
>(fn: Fn, thisArg: ThisArg): ReturnType<Fn>;
export default function callHelper<Fn extends (this: never) => unknown>(
  fn: Fn,
): ReturnType<Fn>;
export default function callHelper(fn?: undefined, thisArg?: unknown): void;
export default function callHelper(fn?: () => unknown, thisArg?: unknown) {
  // @ts-expect-error -- This is fine, but TS doesn't like it with the overrides
  return call([fn, thisArg]);
}