EC
TS6640
TypeScriptERRORNotableConfigHIGH confidence

Skip building downstream projects on error in upstream project.

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6640): Skip building downstream projects on error in upstream project.. This diagnostic is emitted by the TypeScript compiler when skip building downstream projects on error in upstream project..

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

TypeScript compiler reports TS6640 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6640
// Skip building downstream projects on error in upstream project.

expected output

error TS6640: Skip building downstream projects on error in upstream project.

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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