@babel/runtime-corejs2

Various bug fixes and additions.

And thanks to @benmosher, @ryanwmarsh, @Cyp, @vvyomjjain, @byronluk, @everdimension for their first PRs!

:eyeglasses: Spec Compliancy

• babel-parser, babylon

  • Fix await in function name and parameters. (@nicolo-ribaudo)

:rocket: New Feature

• babel-parser

  • Typescript: Validate tuple type element positions. (@Retsam)

  • [flow] Add support for parsing _ as implicit instantiation in call/new. (@jbrown215)

• babel-core, babel-generator, babel-parser, babel-plugin-syntax-typescript, babel-traverse

  • Remove Babylon plugins for features already merged to the ECMAScript spec. (@nicolo-ribaudo)

• babel-parser, babel-types

  • [flow] Explicit inexact objects with .... (@jbrown215)

• babel-preset-env

  • Update preset-env data. (@existentialism)

:bug: Bug Fix

• babel-parser

  • Do not allow TypeCastExpressions w/o parens . (@danez)

  • Allow function types in type params within arrow return types. (@danez)

  • Closes #8865. (@byronluk)

• babel-core

  • Resolve babel.config.js 'babelrcRoots' values relative to the config file.. (@loganfsmyth)

  • Fix message when plugin of a wrong type is passed. (@everdimension)

• babel-plugin-transform-block-scoping

  • rename colliding let bindings with for loop init. (@byronluk)

  • Treat break inside block inside loop. (@thiagoarrais)

• babel-preset-env

  • preset-env: Edge support for arrow param destructuring. (@benmosher)

• babel-generator

  • fix single-arg async arrows when retainLines=true. (@ryanwmarsh)

• babel-traverse

  • fix: Expression x === 'y' && '' should not evaluate to undefined.. (@Cyp)