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80 lines
2.9 KiB
JavaScript
80 lines
2.9 KiB
JavaScript
'use strict';
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// / <reference types="node" />
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var callBind = require('call-bind');
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var forEach = require('for-each');
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var gOPD = require('gopd');
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var isTypedArray = require('is-typed-array');
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var typedArrays = require('possible-typed-array-names');
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var gPO = require('reflect.getprototypeof/polyfill')();
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/** @typedef {(value: import('.').TypedArray) => number} TypedArrayLengthGetter */
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/** @typedef {{ [k in `$${import('.').TypedArrayName}` | '__proto__']: k extends '__proto__' ? null : TypedArrayLengthGetter }} Cache */
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/** @type {Cache} */
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// @ts-expect-error TS `satisfies` doesn't work in jsdoc
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var getters = { __proto__: null };
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var oDP = Object.defineProperty;
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if (gOPD) {
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var getLength = /** @type {TypedArrayLengthGetter} */ function (x) {
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return x.length;
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};
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forEach(typedArrays, /** @type {(typedArray: import('.').TypedArrayName) => void} */ function (typedArray) {
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var TA = global[typedArray];
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// In Safari 7, Typed Array constructors are typeof object
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if (typeof TA === 'function' || typeof TA === 'object') {
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var Proto = TA.prototype;
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// @ts-expect-error TS doesn't narrow types inside callbacks, which is weird
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var descriptor = gOPD(Proto, 'length');
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if (!descriptor) {
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var superProto = gPO(Proto);
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// @ts-expect-error TS doesn't narrow types inside callbacks, which is weird
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descriptor = gOPD(superProto, 'length');
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}
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// Opera 12.16 has a magic length data property on instances AND on Proto
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if (descriptor && descriptor.get) {
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// eslint-disable-next-line no-extra-parens
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getters[/** @type {`$${import('.').TypedArrayName}`} */ ('$' + typedArray)] = callBind(descriptor.get);
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} else if (oDP) {
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// this is likely an engine where instances have a magic length data property
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var arr = new global[typedArray](2);
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// @ts-expect-error TS doesn't narrow types inside callbacks, which is weird
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descriptor = gOPD(arr, 'length');
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if (descriptor && descriptor.configurable) {
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oDP(arr, 'length', { value: 3 });
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}
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if (arr.length === 2) {
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// eslint-disable-next-line no-extra-parens
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getters[/** @type {`$${import('.').TypedArrayName}`} */ ('$' + typedArray)] = getLength;
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}
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}
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}
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});
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}
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/** @type {TypedArrayLengthGetter} */
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var tryTypedArrays = function tryAllTypedArrays(value) {
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/** @type {number} */ var foundLength;
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// @ts-expect-error not sure why this won't work
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forEach(getters, /** @type {(getter: TypedArrayLengthGetter) => void} */ function (getter) {
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if (typeof foundLength !== 'number') {
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try {
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var length = getter(value);
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if (typeof length === 'number') {
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foundLength = length;
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}
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} catch (e) {}
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}
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});
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// @ts-expect-error TS can't guarantee the above callback is invoked sync
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return foundLength;
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};
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/** @type {import('.')} */
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module.exports = function typedArrayLength(value) {
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if (!isTypedArray(value)) {
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return false;
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}
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return tryTypedArrays(value);
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};
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