Element implicitly has an 'any' type because index expression is not of type ...
Production Risk
Build will fail; resolve before shipping.
A strict mode error (TS7015): Element implicitly has an 'any' type because index expression is not of type 'number'.. This diagnostic is emitted by the TypeScript compiler when element implicitly has an 'any' type because index expression is not of type 'number'..
- 1TypeScript cannot infer the type and defaults to 'any' with --noImplicitAny
- 2Missing type annotation or type parameter
TypeScript compiler reports TS7015 during type checking.
// Triggers TS7015 // Element implicitly has an 'any' type because index expression is not of type 'number'.
expected output
error TS7015: Element implicitly has an 'any' type because index expression is not of type 'number'.
Fix
Add an explicit type annotation
WHEN When TypeScript cannot infer the type
// Before (implicit any)
function process(value) { return value; }
// After (explicit type)
function process(value: string): string { return value; }Why this works
Adding explicit type annotations removes the implicit 'any' and enables full type checking.
✕ Suppress with @ts-ignore instead of fixing the type
ts-ignore hides real type errors and makes refactoring unsafe.
TypeScript Compiler Diagnostics
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