46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
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'use strict';
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var $TypeError = require('es-errors/type');
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var IsPropertyKey = require('./IsPropertyKey');
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var SameValue = require('./SameValue');
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var Type = require('./Type');
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// IE 9 does not throw in strict mode when writability/configurability/extensibility is violated
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var noThrowOnStrictViolation = (function () {
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try {
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delete [].length;
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return true;
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} catch (e) {
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return false;
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}
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}());
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// https://262.ecma-international.org/6.0/#sec-set-o-p-v-throw
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module.exports = function Set(O, P, V, Throw) {
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if (Type(O) !== 'Object') {
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throw new $TypeError('Assertion failed: `O` must be an Object');
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}
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if (!IsPropertyKey(P)) {
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throw new $TypeError('Assertion failed: `P` must be a Property Key');
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}
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if (typeof Throw !== 'boolean') {
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throw new $TypeError('Assertion failed: `Throw` must be a Boolean');
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}
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if (Throw) {
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O[P] = V; // eslint-disable-line no-param-reassign
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if (noThrowOnStrictViolation && !SameValue(O[P], V)) {
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throw new $TypeError('Attempted to assign to readonly property.');
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}
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return true;
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}
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try {
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O[P] = V; // eslint-disable-line no-param-reassign
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return noThrowOnStrictViolation ? SameValue(O[P], V) : true;
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} catch (e) {
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return false;
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}
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};
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