Quick Note

TypeScript: The satisfies Operator

Using satisfies for better type inference while still validating types.

January 24, 20241 min read

The satisfies operator validates a type without widening it:

const config = {
  port: 3000,
  host: 'localhost'
} satisfies Record<string, string | number>;

// config.port is number, not string | number!

This gives you both validation AND precise inference.

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