EC
TS6230
TypeScriptERRORNotableConfigHIGH confidence

Option 'X' can only be specified in 'tsconfig.json' file or set to 'false' or...

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6230): Option 'X' can only be specified in 'tsconfig.json' file or set to 'false' or 'null' on command line.. This diagnostic is emitted by the TypeScript compiler when option 'X' can only be specified in 'tsconfig.json' file or set to 'false' or 'null' on command line..

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

TypeScript compiler reports TS6230 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6230
// Option 'X' can only be specified in 'tsconfig.json' file or set to 'false' or 'null' on command line.

expected output

error TS6230: Option 'X' can only be specified in 'tsconfig.json' file or set to 'false' or 'null' on command line.

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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