EC
TS5096
TypeScriptERRORNotableConfigHIGH confidence

Option 'allowImportingTsExtensions' can only be used when one of 'noEmit', 'e...

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS5096): Option 'allowImportingTsExtensions' can only be used when one of 'noEmit', 'emitDeclarationOnly', or 'rewriteRelativeImportExtensions' is set.. This diagnostic is emitted by the TypeScript compiler when option 'allowImportingTsExtensions' can only be used when one of 'noEmit', 'emitDeclarationOnly', or 'rewriteRelativeImportExtensions' is set..

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

TypeScript compiler reports TS5096 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS5096
// Option 'allowImportingTsExtensions' can only be used when one of 'noEmit', 'emitDeclarationOnly', or 'rewriteRelativeImportExtensions' is set.

expected output

error TS5096: Option 'allowImportingTsExtensions' can only be used when one of 'noEmit', 'emitDeclarationOnly', or 'rewriteRelativeImportExtensions' is set.

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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