EC
TS7012
TypeScriptERRORNotableStrictHIGH confidence

This overload implicitly returns the type 'X' because it lacks a return type ...

Production Risk

Build will fail; resolve before shipping.

What this means

A strict mode error (TS7012): This overload implicitly returns the type 'X' because it lacks a return type annotation.. This diagnostic is emitted by the TypeScript compiler when this overload implicitly returns the type 'X' because it lacks a return type annotation..

Why it happens
  1. 1The function overload signatures do not match the implementation
How to reproduce

TypeScript compiler reports TS7012 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS7012
// This overload implicitly returns the type 'X' because it lacks a return type annotation.

expected output

error TS7012: This overload implicitly returns the type 'X' because it lacks a return type annotation.

Fix

Address the TypeScript diagnostic

WHEN When this error is reported by the compiler

Address the TypeScript diagnostic
// Run the TypeScript compiler for details:
npx tsc --noEmit
// Use the TypeScript playground to test your code:
// https://www.typescriptlang.org/play

Why this works

Review the full error message and location; the TypeScript handbook provides guidance on each error category.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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