2. esbuild has support for TS (it strips the type annotations out during build), and is plenty fast (compared to webpack, rollup etc). So bundling itself should never be an issue. The other aspect is type checking. If you want TS to type check your project, then yes it takes a bit of time. But that's no different than running tests. Of course running those will take some time. Once the project is bundled, the startup time should not be affected at all, it's all JS anyways.
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2. esbuild has support for TS (it strips the type annotations out during build), and is plenty fast (compared to webpack, rollup etc). So bundling itself should never be an issue. The other aspect is type checking. If you want TS to type check your project, then yes it takes a bit of time. But that's no different than running tests. Of course running those will take some time. Once the project is bundled, the startup time should not be affected at all, it's all JS anyways.