Optional Chaining Operator (Stage 1) by jridgewell · Pull Request #5813 · babel/babel

Example: https://babeljs.io/repl/build/master#?babili=false&browsers=&build=&builtIns=false&code_lz=IYfgdARg3AUDqTAYzAE1vcFnnXBA2gOQREC6shEFmYAFAJRRA&debug=false&circleciRepo=&evaluate=false&lineWr...