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files >> //lib/node_modules/npm/node_modules/define-properties/index.js
'use strict'; var keys = require('object-keys'); var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol'; var toStr = Object.prototype.toString; var concat = Array.prototype.concat; var origDefineProperty = Object.defineProperty; var isFunction = function (fn) { return typeof fn === 'function' && toStr.call(fn) === '[object Function]'; }; var arePropertyDescriptorsSupported = function () { var obj = {}; try { origDefineProperty(obj, 'x', { enumerable: false, value: obj }); // eslint-disable-next-line no-unused-vars, no-restricted-syntax for (var _ in obj) { // jscs:ignore disallowUnusedVariables return false; } return obj.x === obj; } catch (e) { /* this is IE 8. */ return false; } }; var supportsDescriptors = origDefineProperty && arePropertyDescriptorsSupported(); var defineProperty = function (object, name, value, predicate) { if (name in object && (!isFunction(predicate) || !predicate())) { return; } if (supportsDescriptors) { origDefineProperty(object, name, { configurable: true, enumerable: false, value: value, writable: true }); } else { object[name] = value; } }; var defineProperties = function (object, map) { var predicates = arguments.length > 2 ? arguments[2] : {}; var props = keys(map); if (hasSymbols) { props = concat.call(props, Object.getOwnPropertySymbols(map)); } for (var i = 0; i < props.length; i += 1) { defineProperty(object, props[i], map[props[i]], predicates[props[i]]); } }; defineProperties.supportsDescriptors = !!supportsDescriptors; module.exports = defineProperties;
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