EC
TS6239
TypeScriptERRORNotableConfigHIGH confidence

File 'X' exists according to earlier cached lookups.

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6239): File 'X' exists according to earlier cached lookups.. This diagnostic is emitted by the TypeScript compiler when file 'X' exists according to earlier cached lookups..

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

TypeScript compiler reports TS6239 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6239
// File 'X' exists according to earlier cached lookups.

expected output

error TS6239: File 'X' exists according to earlier cached lookups.

Fix

Fix the tsconfig.json option

WHEN When a compiler option is invalid or missing

Fix the tsconfig.json option
// tsconfig.json
{
  "compilerOptions": {
    // Review and correct the flagged option
  }
}
// Run: npx tsc --showConfig to see effective config

Why this works

TypeScript validates tsconfig.json options; check the official tsconfig reference for valid values.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev

← All TypeScript errors