EC
TS2391
TypeScriptERRORNotableTypeHIGH confidence

Function implementation is missing or not immediately following the declaration.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2391): Function implementation is missing or not immediately following the declaration.. This diagnostic is emitted by the TypeScript compiler when function implementation is missing or not immediately following the declaration..

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

TypeScript compiler reports TS2391 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2391
// Function implementation is missing or not immediately following the declaration.

expected output

error TS2391: Function implementation is missing or not immediately following the declaration.

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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