61 lines
2.6 KiB
JavaScript
61 lines
2.6 KiB
JavaScript
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import { BLOCKED_PAGES } from "../shared/lib/constants";
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export function isBlockedPage(page) {
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return BLOCKED_PAGES.includes(page);
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}
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export function cleanAmpPath(pathname) {
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if (pathname.match(/\?amp=(y|yes|true|1)/)) {
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pathname = pathname.replace(/\?amp=(y|yes|true|1)&?/, "?");
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}
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if (pathname.match(/&=(y|yes|true|1)/)) {
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pathname = pathname.replace(/&=(y|yes|true|1)/, "");
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}
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pathname = pathname.replace(/\?$/, "");
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return pathname;
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}
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export function debounce(fn, ms, maxWait = Infinity) {
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let timeoutId;
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// The time the debouncing function was first called during this debounce queue.
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let startTime = 0;
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// The time the debouncing function was last called.
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let lastCall = 0;
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// The arguments and this context of the last call to the debouncing function.
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let args, context;
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// A helper used to that either invokes the debounced function, or
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// reschedules the timer if a more recent call was made.
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function run() {
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const now = Date.now();
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const diff = lastCall + ms - now;
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// If the diff is non-positive, then we've waited at least `ms`
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// milliseconds since the last call. Or if we've waited for longer than the
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// max wait time, we must call the debounced function.
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if (diff <= 0 || startTime + maxWait >= now) {
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// It's important to clear the timeout id before invoking the debounced
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// function, in case the function calls the debouncing function again.
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timeoutId = undefined;
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fn.apply(context, args);
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} else {
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// Else, a new call was made after the original timer was scheduled. We
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// didn't clear the timeout (doing so is very slow), so now we need to
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// reschedule the timer for the time difference.
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timeoutId = setTimeout(run, diff);
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}
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}
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return function(...passedArgs) {
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// The arguments and this context of the most recent call are saved so the
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// debounced function can be invoked with them later.
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args = passedArgs;
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context = this;
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// Instead of constantly clearing and scheduling a timer, we record the
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// time of the last call. If a second call comes in before the timer fires,
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// then we'll reschedule in the run function. Doing this is considerably
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// faster.
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lastCall = Date.now();
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// Only schedule a new timer if we're not currently waiting.
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if (timeoutId === undefined) {
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startTime = lastCall;
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timeoutId = setTimeout(run, ms);
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}
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};
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}
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//# sourceMappingURL=utils.js.map
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