EC
TS90031
TypeScriptERRORNotableConfigHIGH confidence

Replace all unused 'infer' with 'unknown'

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS90031): Replace all unused 'infer' with 'unknown'. This diagnostic is emitted by the TypeScript compiler when replace all unused 'infer' with 'unknown'.

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

TypeScript compiler reports TS90031 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS90031
// Replace all unused 'infer' with 'unknown'

expected output

error TS90031: Replace all unused 'infer' with 'unknown'

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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