Type '...' is not assignable to type '...'
Full error message
TS2322: Type 'string | undefined' is not assignable to type 'string'.
Solution
TypeScript detected a value might be undefined. 1. Narrow via guard: `if (value) { /* value is string here */ }`. 2. Default: `const x: string = value ?? ''`. 3. Non-null assertion ONLY when you're sure: `value!` (use sparingly). 4. Use Zod / io-ts to parse external input into a fully-typed value.
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