The highlights of TypeScript 3.8 RC are:
- New syntax for type import/export: The import type syntax allows declarations for type annotation and declaration only, which erase before the runtime. While, the export type syntax offers an export for type contexts, which would be deleted from TypeScript output.
- “Fast and loose” incremental type checking: It reduces the build time of individual files, as the TypeScript code only checks or rebuilds the files that have been changed or imported directly.
- Top-level await: This new ECMAScript feature removes restrictions at the top of the module under certain conditions to make non-blocking operations.
- Better Directory Watching: The watchOptions field in tsconfig.json and jsconfig.json allows users to determine the file watching strategies of the language/compiler service and monitor the files and directories.
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