$ cnpm install babel-plugin-syntax-optional-chaining
Allow parsing of optional properties.
npm install --save-dev babel-plugin-syntax-optional-chaining
.babelrc (Recommended).babelrc
{
"plugins": ["syntax-optional-chaining"]
}
babel --plugins syntax-optional-chaining script.js
require("babel-core").transform("code", {
plugins: ["syntax-optional-chaining"]
});
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