59 lines
1.3 KiB
JavaScript
59 lines
1.3 KiB
JavaScript
'use strict';
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var assert = require('assert');
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var WM = require('es6-weak-map');
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var hasNativeWeakMap = require('es6-weak-map/is-native-implemented');
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var defaultResolution = require('default-resolution');
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var runtimes = new WM();
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function isFunction(fn) {
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return (typeof fn === 'function');
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}
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function isExtensible(fn) {
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if (hasNativeWeakMap) {
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// Native weakmap doesn't care about extensible
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return true;
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}
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return Object.isExtensible(fn);
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}
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function lastRun(fn, timeResolution) {
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assert(isFunction(fn), 'Only functions can check lastRun');
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assert(isExtensible(fn), 'Only extensible functions can check lastRun');
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var time = runtimes.get(fn);
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if (time == null) {
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return;
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}
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var resolution = defaultResolution(timeResolution);
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return time - (time % resolution);
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}
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function capture(fn, timestamp) {
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assert(isFunction(fn), 'Only functions can be captured');
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assert(isExtensible(fn), 'Only extensible functions can be captured');
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timestamp = timestamp || Date.now();
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runtimes.set(fn, timestamp);
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}
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function release(fn) {
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assert(isFunction(fn), 'Only functions can be captured');
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assert(isExtensible(fn), 'Only extensible functions can be captured');
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runtimes.delete(fn);
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}
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lastRun.capture = capture;
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lastRun.release = release;
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module.exports = lastRun;
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