EC
TS18043
TypeScriptERRORNotableTypeHIGH confidence

Types cannot appear in export declarations in JavaScript files.

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS18043): Types cannot appear in export declarations in JavaScript files.. This diagnostic is emitted by the TypeScript compiler when types cannot appear in export declarations in JavaScript files..

Why it happens
  1. 1Incorrect TypeScript syntax or type usage
  2. 2Type mismatch between declared and actual value
How to reproduce

TypeScript compiler reports TS18043 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS18043
// Types cannot appear in export declarations in JavaScript files.

expected output

error TS18043: Types cannot appear in export declarations in JavaScript files.

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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