22 lines
757 B
JavaScript
22 lines
757 B
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.computed = void 0;
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const tracker_1 = require("./tracker");
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const system_1 = require("./system");
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const dep_1 = require("./dep");
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function computed(getter) {
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let oldValue;
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const tracker = new tracker_1.Tracker(() => (0, system_1.trigger)(dep, 1 /* DirtyLevels.ComputedValueMaybeDirty */));
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const fn = () => {
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(0, system_1.track)(dep);
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if (tracker.dirty
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&& !Object.is(oldValue, oldValue = tracker.track(() => getter(oldValue)))) {
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(0, system_1.trigger)(dep, 2 /* DirtyLevels.ComputedValueDirty */);
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}
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return oldValue;
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};
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const dep = new dep_1.Dep(fn);
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return fn;
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}
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exports.computed = computed;
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