'new' expression, whose target lacks a construct signature, implicitly has an...
Production Risk
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A strict mode error (TS7009): 'new' expression, whose target lacks a construct signature, implicitly has an 'any' type.. This diagnostic is emitted by the TypeScript compiler when 'new' expression, whose target lacks a construct signature, implicitly has an 'any' type..
- 1TypeScript cannot infer the type and defaults to 'any' with --noImplicitAny
- 2Missing type annotation or type parameter
TypeScript compiler reports TS7009 during type checking.
// Triggers TS7009 // 'new' expression, whose target lacks a construct signature, implicitly has an 'any' type.
expected output
error TS7009: 'new' expression, whose target lacks a construct signature, implicitly has an 'any' type.
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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