TypeScript
TypeScript could not safely use the expression to index the target type
error TS7053: Element implicitly has an 'any' type because expression of type 'X' can't be used to index type 'Y'.
TypeScript rejected an indexed access because the key expression is not known to be valid for the target type, so the result cannot be typed safely.
Observed message
error TS7053: Element implicitly has an 'any' type because expression of type 'X' can't be used to index type 'Y'.
Why it happens
- The indexing expression is broader than the known keys of the target type.
- The target type has no compatible index signature.
- A string key is being used where TypeScript expects a narrower keyof type.
How to fix it
- Narrow the key to a valid keyof the target type.
- Add an index signature only if arbitrary keys are genuinely supported.
- Refactor the access pattern so TypeScript can prove the key is valid.
