52 lines
2.3 KiB
JavaScript
52 lines
2.3 KiB
JavaScript
/**
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* We extend `Date` during builds and revalidates to ensure that prerenders don't observe the clock as a source of IO
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* When dynamicIO is enabled. The current time is a form of IO even though it resolves synchronously. When dyanmicIO is
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* enabled we need to ensure that clock time is excluded from prerenders unless it is cached.
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*
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* There is tension here because time is used for both output and introspection. While arbitrary we intend to reserve
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* `Date` for output use cases and `performance` for introspection use cases. If you want to measure
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* how long something takes use `performance.timeOrigin` and `performance.now()` rather than `Date.now()` for instance.
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*
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* The extensions here never error nor alter the underlying Date objects, strings, and numbers created and thus should be transparent to callers.
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*/ "use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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const _utils = require("./utils");
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function createNow(originalNow) {
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return ({
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now: function now() {
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(0, _utils.io)('`Date.now()`', 'time');
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return originalNow();
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}
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})['now'.slice()].bind(null);
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}
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function createDate(originalConstructor) {
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const properties = Object.getOwnPropertyDescriptors(originalConstructor);
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properties.now.value = createNow(originalConstructor.now);
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const apply = Reflect.apply;
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const construct = Reflect.construct;
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const newConstructor = Object.defineProperties(// Ideally this should not minify the name.
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function Date1() {
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if (new.target === undefined) {
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(0, _utils.io)('`Date()`', 'time');
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return apply(originalConstructor, undefined, arguments);
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}
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if (arguments.length === 0) {
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(0, _utils.io)('`new Date()`', 'time');
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}
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return construct(originalConstructor, arguments, new.target);
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}, properties);
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Object.defineProperty(originalConstructor.prototype, 'constructor', {
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value: newConstructor
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});
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return newConstructor;
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}
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try {
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// eslint-disable-next-line no-native-reassign
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Date = createDate(Date);
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} catch {
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console.error('Failed to install `Date` class extension. When using `experimental.dynamicIO`, APIs that read the current time will not correctly trigger dynamic behavior.');
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}
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//# sourceMappingURL=date.js.map
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