all: change approach to extensions on imports #716
Merged
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It's currently not possible to run ./build.js under node-22, which is a shame, because we'll want to be able to do that soon (due to upcoming TypeScript support, which will let us stop using tsx and its bundled copy of esbuild, simplifying builds on arm64).
Reading the developments on the addition of TypeScript support to Node, it seems to be the case that TypeScript is somewhat isolated in their opinion on the correct approach for handling extensions on import statements. Indeed, node-22 will outright break if we don't use extensions correctly.
Add back the extensions that we removed from the files in our build process. Change our use of the eslint rule to require extensions, rather than forbid them, and update our code accordingly. Updating our bundled code is not strictly necessary (and we could just drop the eslint rule entirely) but let's be consistent.
Add an option to our tsconfig to tell TypeScript that we want to do things node's way.