Babel and esbuild were never here for TypeScript. Babel carried the static
optimizing compiler and one plugin that appended extensions to esbuild's
emitted imports; source now names its own extensions and the compiler rewrites
them on emit. A sixty-line runner replaces the tool: an ESM emit with
declarations, a CommonJS emit where a manifest states a require entry, and a
native emit where a .native sibling takes its sibling's name. The compiler
packages keep Babel as their own substrate; nothing else runs over the code.
Eighteen packages still carry type errors the previous tool never checked.
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