EC
TS6191
TypeScriptERRORNotableConfigHIGH confidence

Whether to keep outdated console output in watch mode instead of clearing the...

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6191): Whether to keep outdated console output in watch mode instead of clearing the screen.. This diagnostic is emitted by the TypeScript compiler when whether to keep outdated console output in watch mode instead of clearing the screen..

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

TypeScript compiler reports TS6191 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6191
// Whether to keep outdated console output in watch mode instead of clearing the screen.

expected output

error TS6191: Whether to keep outdated console output in watch mode instead of clearing the screen.

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

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