vue hello world项目
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var path = require('../internals/path');
var hasOwn = require('../internals/has-own-property');
var wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');
var defineProperty = require('../internals/object-define-property').f;
module.exports = function (NAME) {
var Symbol = path.Symbol || (path.Symbol = {});
if (!hasOwn(Symbol, NAME)) defineProperty(Symbol, NAME, {
value: wrappedWellKnownSymbolModule.f(NAME)
});
};