What this snippet does
isolatedModules enforces that each file can be transpiled independently, requiring explicit 'type' markers for type-only exports.
Expected output
ok
Why practise typing this
Typing tsconfig & compiler code builds muscle memory for the symbols and indentation TypeScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
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