66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.pick = pick;
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exports.installTimerFunctions = installTimerFunctions;
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exports.byteLength = byteLength;
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exports.randomString = randomString;
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const globals_node_js_1 = require("./globals.node.js");
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function pick(obj, ...attr) {
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return attr.reduce((acc, k) => {
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if (obj.hasOwnProperty(k)) {
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acc[k] = obj[k];
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}
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return acc;
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}, {});
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}
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// Keep a reference to the real timeout functions so they can be used when overridden
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const NATIVE_SET_TIMEOUT = globals_node_js_1.globalThisShim.setTimeout;
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const NATIVE_CLEAR_TIMEOUT = globals_node_js_1.globalThisShim.clearTimeout;
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function installTimerFunctions(obj, opts) {
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if (opts.useNativeTimers) {
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obj.setTimeoutFn = NATIVE_SET_TIMEOUT.bind(globals_node_js_1.globalThisShim);
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obj.clearTimeoutFn = NATIVE_CLEAR_TIMEOUT.bind(globals_node_js_1.globalThisShim);
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}
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else {
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obj.setTimeoutFn = globals_node_js_1.globalThisShim.setTimeout.bind(globals_node_js_1.globalThisShim);
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obj.clearTimeoutFn = globals_node_js_1.globalThisShim.clearTimeout.bind(globals_node_js_1.globalThisShim);
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}
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}
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// base64 encoded buffers are about 33% bigger (https://en.wikipedia.org/wiki/Base64)
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const BASE64_OVERHEAD = 1.33;
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// we could also have used `new Blob([obj]).size`, but it isn't supported in IE9
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function byteLength(obj) {
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if (typeof obj === "string") {
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return utf8Length(obj);
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}
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// arraybuffer or blob
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return Math.ceil((obj.byteLength || obj.size) * BASE64_OVERHEAD);
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}
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function utf8Length(str) {
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let c = 0, length = 0;
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for (let i = 0, l = str.length; i < l; i++) {
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c = str.charCodeAt(i);
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if (c < 0x80) {
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length += 1;
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}
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else if (c < 0x800) {
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length += 2;
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}
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else if (c < 0xd800 || c >= 0xe000) {
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length += 3;
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}
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else {
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i++;
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length += 4;
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}
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}
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return length;
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}
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/**
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* Generates a random 8-characters string.
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*/
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function randomString() {
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return (Date.now().toString(36).substring(3) +
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Math.random().toString(36).substring(2, 5));
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}
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