Babel 7.21.0; ESLint 8.35.0; esbuild 0.17.10; Lerna 6.5; Turborepo 1.8; Node.js 19.7.0; Deno 1.31; beyond JSON.stringify/parse; import maps

• Inline RegExp modifiers (Stage 3 proposal)
• TC39, the committee that standardizes JavaScript, recently approved some changes to the Decorators proposal based on feedback from the TypeScript team. These are now supported by Babel.
• TypeScript 5.0:
  • const modifiers for type parameters
  • export type * declarations
• Experimental support for .cts configuration files
• Source maps improvements

• ESLint’s predefined recommended and all configs are now exported from a new @eslint/js package.
• The no-constant-binary-expression rule now catches more cases involving the nullish coalescing operator (??).
• A new version of the esquery selector engine includes performance improvements covered in a blog post by Marvin Hagemeister.

• Update esbuild's handling of CSS nesting to match the latest specification changes
• Fix cross-file CSS rule deduplication involving url() tokens

• Idempotency added to the lerna publish from-git command
• lerna run can run multiple scripts in a single command
• New --include-private option added to lerna publish

Turborepo 1.8 brings better flexibility and more control to your codebase by improving turbo’s understanding of your workspaces.

• Workspace Configurations: You can now add a turbo.json configuration file in a workspace to override the root configuration in your repository.
• Automatic Workspace Scoping: Global turbo now automatically infers your current workspace so that it only runs that workspace’s tasks.
• Easier Migrations: Automatically migrate to new versions of turbo with npx @turbo/codemod migrate.

• package.json support
• Stabilization of Node-API
• Node.js compatibility layer is now part of the runtime
• npm specifiers are supported in remote modules

• cyclical references (obj.self = obj)
• repeated references ([value, value])
• undefined, Infinity, NaN, -0
• regular expressions
• dates
• Map and Set
• BigInt
• custom types via replacers, reducers and revivers