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musix-oss/node_modules/core-js/internals/to-primitive.js

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2020-03-03 20:30:50 +00:00
var isObject = require('../internals/is-object');
// `ToPrimitive` abstract operation
// https://tc39.github.io/ecma262/#sec-toprimitive
// instead of the ES6 spec version, we didn't implement @@toPrimitive case
// and the second argument - flag - preferred type is a string
module.exports = function (input, PREFERRED_STRING) {
if (!isObject(input)) return input;
var fn, val;
if (PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
if (typeof (fn = input.valueOf) == 'function' && !isObject(val = fn.call(input))) return val;
if (!PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
throw TypeError("Can't convert object to primitive value");
};