What this snippet does
An immediate circular alias without any structure causes a compiler error because the type cannot be resolved.
Expected output
Compile Error: Type alias 'T' circularly references itself.
Why practise typing this
Typing type system limits 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.
More TypeScript practice
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- Exceeding tuple recursion limitsType System Limits · advanced
- Infinite conditional type distributionType System Limits · advanced