EC
TS6705
TypeScriptERRORNotableConfigHIGH confidence

Set the JavaScript language version for emitted JavaScript and include compat...

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6705): Set the JavaScript language version for emitted JavaScript and include compatible library declarations.. This diagnostic is emitted by the TypeScript compiler when set the JavaScript language version for emitted JavaScript and include compatible library declarations..

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

TypeScript compiler reports TS6705 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6705
// Set the JavaScript language version for emitted JavaScript and include compatible library declarations.

expected output

error TS6705: Set the JavaScript language version for emitted JavaScript and include compatible library declarations.

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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