@modern-js/runtime-utils/dist/cjs/browser/deferreds.js

A Progressive React Framework for modern web development.

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var deferreds_exports = {};
__export(deferreds_exports, {
  AbortedDeferredError: () => AbortedDeferredError,
  DeferredData: () => DeferredData,
  activeDeferreds: () => activeDeferreds,
  invariant: () => invariant
});
module.exports = __toCommonJS(deferreds_exports);
function invariant(value, message) {
  if (value === false || value === null || typeof value === "undefined") {
    throw new Error(message);
  }
}
class AbortedDeferredError extends Error {
}
function isTrackedPromise(value) {
  return value instanceof Promise && value._tracked === true;
}
function unwrapTrackedPromise(value) {
  if (!isTrackedPromise(value)) {
    return value;
  }
  if (value._error) {
    throw value._error;
  }
  return value._data;
}
class DeferredData {
  trackPromise(key, value) {
    if (!(value instanceof Promise)) {
      return value;
    }
    this.deferredKeys.push(key);
    this.pendingKeysSet.add(key);
    const promise = Promise.race([
      value,
      this.abortPromise
    ]).then((data) => this.onSettle(promise, key, void 0, data), (error) => this.onSettle(promise, key, error));
    promise.catch(() => {
    });
    Object.defineProperty(promise, "_tracked", {
      get: () => true
    });
    return promise;
  }
  onSettle(promise, key, error, data) {
    if (this.controller.signal.aborted && error instanceof AbortedDeferredError) {
      this.unlistenAbortSignal();
      Object.defineProperty(promise, "_error", {
        get: () => error
      });
      return Promise.reject(error);
    }
    this.pendingKeysSet.delete(key);
    if (this.done) {
      this.unlistenAbortSignal();
    }
    if (error === void 0 && data === void 0) {
      const undefinedError = new Error(`Deferred data for key "${key}" resolved/rejected with \`undefined\`, you must resolve/reject with a value or \`null\`.`);
      Object.defineProperty(promise, "_error", {
        get: () => undefinedError
      });
      this.emit(false, key);
      return Promise.reject(undefinedError);
    }
    if (data === void 0) {
      Object.defineProperty(promise, "_error", {
        get: () => error
      });
      this.emit(false, key);
      return Promise.reject(error);
    }
    Object.defineProperty(promise, "_data", {
      get: () => data
    });
    this.emit(false, key);
    return data;
  }
  emit(aborted, settledKey) {
    this.subscribers.forEach((subscriber) => subscriber(aborted, settledKey));
  }
  subscribe(fn) {
    this.subscribers.add(fn);
    return () => this.subscribers.delete(fn);
  }
  cancel() {
    this.controller.abort();
    this.pendingKeysSet.forEach((v, k) => this.pendingKeysSet.delete(k));
    this.emit(true);
  }
  async resolveData(signal) {
    let aborted = false;
    if (!this.done) {
      const onAbort = () => this.cancel();
      signal.addEventListener("abort", onAbort);
      aborted = await new Promise((resolve) => {
        this.subscribe((aborted2) => {
          signal.removeEventListener("abort", onAbort);
          if (aborted2 || this.done) {
            resolve(aborted2);
          }
        });
      });
    }
    return aborted;
  }
  get done() {
    return this.pendingKeysSet.size === 0;
  }
  get unwrappedData() {
    invariant(this.data !== null && this.done, "Can only unwrap data on initialized and settled deferreds");
    return Object.entries(this.data).reduce((acc, [key, value]) => Object.assign(acc, {
      [key]: unwrapTrackedPromise(value)
    }), {});
  }
  get pendingKeys() {
    return Array.from(this.pendingKeysSet);
  }
  constructor(data, responseInit) {
    this.pendingKeysSet = /* @__PURE__ */ new Set();
    this.subscribers = /* @__PURE__ */ new Set();
    this.__modern_deferred = true;
    this.deferredKeys = [];
    invariant(data && typeof data === "object" && !Array.isArray(data), "defer() only accepts plain objects");
    let reject;
    this.abortPromise = new Promise((_, r) => reject = r);
    this.controller = new AbortController();
    const onAbort = () => reject(new AbortedDeferredError("Deferred data aborted"));
    this.unlistenAbortSignal = () => this.controller.signal.removeEventListener("abort", onAbort);
    this.controller.signal.addEventListener("abort", onAbort);
    this.data = Object.entries(data).reduce((acc, [key, value]) => Object.assign(acc, {
      [key]: this.trackPromise(key, value)
    }), {});
    if (this.done) {
      this.unlistenAbortSignal();
    }
    this.init = responseInit;
  }
}
const activeDeferreds = /* @__PURE__ */ new Map();
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  AbortedDeferredError,
  DeferredData,
  activeDeferreds,
  invariant
});