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21 lines
757 B
21 lines
757 B
"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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