BigInt in JavaScript

What this snippet does

BigInt allows arbitrary-precision integers — you can't mix BigInt and Number in the same operation without explicit conversion.

Expected output

9007199254740993n
bigint
9007199254740992n
Cannot mix BigInt and other types, use explicit conversions

Why practise typing this

Typing bigint code builds muscle memory for the symbols and indentation JavaScript 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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