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Updates our js transpiler code to use Babel 7.11.6 List of changes in this commit: - Updates plugins, babel plugins all have a new version which doesn't contain -es2015- anymore - Drops [transform-es2015-classes](https://babeljs.io/docs/en/babel-plugin-transform-classes) this plugin shouldn't be needed now that we don't support IE - Drops check-es2015-constants, checking constants is now part of babel and the check-constants plugin is deprecated. As a result the behavior slightly changed, and is now wrapping every const call in a readOnlyError function which would throw if assigned a new value. This explains the modified spec. - Adds [proposal-optional-chaining](https://babeljs.io/docs/en/babel-plugin-proposal-optional-chaining) ```javascript const obj = { foo: { bar: { baz: 42, }, }, }; const baz = obj?.foo?.bar?.baz; // 42 ``` - Adds [proposal-json-strings](https://babeljs.io/docs/en/babel-plugin-proposal-json-strings) ```javascript // IN const ex = "before after"; // ^ There's a U+2028 char between 'before' and 'after' // OUT const ex = "before\u2028after"; // ^ There's a U+2028 char between 'before' and 'after' ``` - Adds [proposal-nullish-coalescing-operator](https://babeljs.io/docs/en/babel-plugin-proposal-nullish-coalescing-operator) ```javascript var object = {}; var foo = object.foo ?? "default"; // default ``` - Adds [proposal-logical-assignment-operators](https://babeljs.io/docs/en/babel-plugin-proposal-logical-assignment-operators) ```javascript let a; let b = 2; a ||= b; // 2 ``` - Adds [proposal-numeric-separator](https://babeljs.io/docs/en/babel-plugin-proposal-numeric-separator) ```javascript let budget = 1_000_000_000_000; console.log(budget === 10 ** 12); // true ``` - Adds proposal-object-rest-spread https://babeljs.io/docs/en/babel-plugin-proposal-object-rest-spread ```javascript let { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 }; console.log(x); // 1 console.log(y); // 2 console.log(z); // { a: 3, b: 4 } ``` - Adds proposal-optional-catch-binding https://babeljs.io/docs/en/babel-plugin-proposal-optional-catch-binding ```javascript try { } catch { } finally { // ensures finally is available in every browsers } ``` - Adds improved regex support for firefox through (transform-dotall-regex](https://babeljs.io/docs/en/next/babel-plugin-transform-dotall-regex.html) and (proposal-unicode-property-regex](https://babeljs.io/docs/en/babel-plugin-proposal-unicode-property-regex) - Drops async/generator stuff, the browser we target should allow to use this (excepts iterable async) |
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