@effect-ts/system/Promise/completeWith.js

Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.completeWith = completeWith;

var _core = /*#__PURE__*/require("../Effect/core.js");

var _state = /*#__PURE__*/require("./state.js");

// ets_tracing: off

/**
 * Completes the promise with the specified effect. If the promise has
 * already been completed, the method will produce false.
 *
 * Note that since the promise is completed with an effect, the effect will
 * be evaluated each time the value of the promise is retrieved through
 * combinators such as `wait`, potentially producing different results if
 * the effect produces different results on subsequent evaluations. In this
 * case te meaning of the "exactly once" guarantee of `Promise` is that the
 * promise can be completed with exactly one effect. For a version that
 * completes the promise with the result of an effect see
 * `Promise.complete`.
 */
function completeWith(io) {
  return promise => (0, _core.succeedWith)(() => {
    const state = promise.state.get;

    switch (state._tag) {
      case "Done":
        {
          return false;
        }

      case "Pending":
        {
          promise.state.set(new _state.Done(io));
          state.joiners.forEach(f => {
            f(io);
          });
          return true;
        }
    }
  });
}
//# sourceMappingURL=completeWith.js.map