EC
TS6131
TypeScriptERRORNotableConfigHIGH confidence

Cannot compile modules using option 'X' unless the '--module' flag is 'amd' o...

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6131): Cannot compile modules using option 'X' unless the '--module' flag is 'amd' or 'system'.. This diagnostic is emitted by the TypeScript compiler when cannot compile modules using option 'X' unless the '--module' flag is 'amd' or 'system'..

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

TypeScript compiler reports TS6131 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6131
// Cannot compile modules using option 'X' unless the '--module' flag is 'amd' or 'system'.

expected output

error TS6131: Cannot compile modules using option 'X' unless the '--module' flag is 'amd' or 'system'.

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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