@web-atoms/core/dist/view-model/Once.js

Web Atoms Core

System.register(["./baseTypes"], function (_export, _context) {
  "use strict";

  var registerInit, timerSymbol, Once;
  return {
    setters: [function (_baseTypes) {
      registerInit = _baseTypes.registerInit;
    }],
    execute: function () {
      timerSymbol = Symbol();
      Once = (timeInMS = 100) => (target, key) => {
        registerInit(target, vm => {
          const oldMethod = vm[key];
          let keyTimer = vm[timerSymbol];
          if (typeof keyTimer === "undefined") {
            keyTimer = {};
            vm[timerSymbol] = keyTimer;
          }
          let running = false;
          vm[key] = (...a) => {
            if (running) {
              return;
            }
            const pending = keyTimer[key];
            if (pending) {
              clearTimeout(pending);
            }
            keyTimer[key] = setTimeout((...b) => {
              running = true;
              delete keyTimer[key];
              const r = oldMethod.apply(vm, b);
              if (r && r.then) {
                r.then(() => {
                  running = false;
                }, e => {
                  running = false;
                  console.warn(e);
                });
              } else {
                running = false;
              }
            }, timeInMS, ...a);
          };
        });
      };
      _export("default", Once);
    }
  };
});
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