It enables the optional chaining operator (a ?. b): see the TC39 proposal
Install the plugin and its dependencies :
npm i @bumped-inc/gatsby-plugin-optional-chaining @babel/core @babel/plugin-proposal-optional-chainingor
yarn add @bumped-inc/gatsby-plugin-optional-chaining @babel/core @babel/plugin-proposal-optional-chainingAdd the plugin in gatsby-config.js:
module.exports = {
plugins: [
// other plugins
'@bumped-inc/gatsby-plugin-optional-chaining',
],
}const maybeObj = null;
const result = maybeObj?.value; // result: undefined
const actualObj = { value: 5 };
const betterResult = actualObj?.value // betterResult: 5