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17 KiB
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1 line
17 KiB
JSON
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{"ast":null,"code":"/* eslint-disable no-undefined,no-param-reassign,no-shadow */\n\n/**\n * Throttle execution of a function. Especially useful for rate limiting\n * execution of handlers on events like resize and scroll.\n *\n * @param {number} delay - A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher)\n * are most useful.\n * @param {Function} callback - A function to be executed after delay milliseconds. The `this` context and all arguments are passed through,\n * as-is, to `callback` when the throttled-function is executed.\n * @param {object} [options] - An object to configure options.\n * @param {boolean} [options.noTrailing] - Optional, defaults to false. If noTrailing is true, callback will only execute every `delay` milliseconds\n * while the throttled-function is being called. If noTrailing is false or unspecified, callback will be executed\n * one final time after the last throttled-function call. (After the throttled-function has not been called for\n * `delay` milliseconds, the internal counter is reset).\n * @param {boolean} [options.noLeading] - Optional, defaults to false. If noLeading is false, the first throttled-function call will execute callback\n * immediately. If noLeading is true, the first the callback execution will be skipped. It should be noted that\n * callback will never executed if both noLeading = true and noTrailing = true.\n * @param {boolean} [options.debounceMode] - If `debounceMode` is true (at begin), schedule `clear` to execute after `delay` ms. If `debounceMode` is\n * false (at end), schedule `callback` to execute after `delay` ms.\n *\n * @returns {Function} A new, throttled, function.\n */\nfunction throttle(delay, callback, options) {\n var _ref = options || {},\n _ref$noTrailing = _ref.noTrailing,\n noTrailing = _ref$noTrailing === void 0 ? false : _ref$noTrailing,\n _ref$noLeading = _ref.noLeading,\n noLeading = _ref$noLeading === void 0 ? false : _ref$noLeading,\n _ref$debounceMode = _ref.debounceMode,\n debounceMode = _ref$debounceMode === void 0 ? undefined : _ref$debounceMode;\n /*\n * After wrapper has stopped being called, this timeout ensures that\n * `callback` is executed at the proper times in `throttle` and `end`\n * debounce modes.\n */\n var timeoutID;\n var cancelled = false;\n\n // Keep track of the last time `callback` was executed.\n var lastExec = 0;\n\n // Function to clear existing timeout\n function clearExistingTimeout() {\n if (timeoutID) {\n clearTimeout(timeoutID);\n }\n }\n\n // Function to cancel next exec\n function cancel(options) {\n var _ref2 = options || {},\n _ref2$upcomingOnly = _ref2.upcomingOnly,\n upcomingOnly = _ref2$upcomingOnly === void 0 ? false : _ref2$upcomingOnly;\n clearExistingTimeout();\n cancelled = !upcomingOnly;\n }\n\n /*\n * The `wrapper` function encapsulates all of the throttling / debouncing\n * functionality and when executed will limit the rate at which `callback`\n * is executed.\n */\n function wrapper() {\n for (var _len = arguments.length, arguments_ = new Array(_len), _key = 0; _key < _len; _key++) {\n arguments_[_key] = arguments[_key];\n }\n var self = this;\n var elapsed = Date.now() - lastExec;\n if (cancelled) {\n return;\n }\n\n // Execute `callback` and update the `lastExec` timestamp.\n function exec() {\n lastExec = Date.now();\n callback.apply(self, arguments_);\n }\n\n /*\n * If `debounceMode` is true (at begin) this is used to clear the flag\n * to allow future `callback` executions.\n */\n function clear() {\n timeoutI
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