TypeScript v6 is here: A full migration guide
Blog post from LogRocket
TypeScript v6 serves as a crucial update bridging the transition to the future Go-powered TypeScript v7 and introduces several key changes aimed at aligning codebases for this shift. Among these changes are new tsconfig.json conventions, such as the defaulting of the types array to an empty array to improve build times by 20-50%, and the inclusion of DOM.Iterable and DOM.AsyncIterable types within the DOM library. Deprecations in v6 include the baseUrl option and several module and target options, pushing developers towards more modern JavaScript standards. Additionally, the strict mode is now enabled by default, and new features like #/ subpath imports and the Temporal API are supported, with ES2025 as the new default target and module options. The update also emphasizes the importance of understanding these changes for a seamless migration, especially for projects aiming to adopt TypeScript v7 in the future, while providing options like the ignoreDeprecations compiler setting for those needing a gradual transition.