typescript-strict

Set "strict": true in the compilerOptions of your tsconfig.json, then add noUncheckedIndexedAccess and noImplicitReturns for stronger checks. Fix the resulting errors incrementally by adding type annotations and type guards.

Replace any types with specific interfaces, generics, or the unknown type combined with type guards. Use utility types like Partial, Pick, and Omit to derive precise types from existing definitions instead of falling back to any.

Utility types like Partial, Pick, and Omit transform existing types into new ones without redefining them. Use Partial for optional updates, Pick to select subsets of properties, and Omit to exclude fields when creating derived types.

Yes, strict mode enables strictNullChecks, which forces explicit handling of null and undefined values. Combined with noUncheckedIndexedAccess, it also flags potentially undefined results from array and object index access.

This flag adds undefined to the return type of index access because the compiler cannot guarantee the index exists. Handle it with explicit undefined checks, optional chaining, or type guards before using the accessed value.