EC
TS90037
TypeScriptERRORNotableConfigHIGH confidence

Fix all incorrect return type of an async functions

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS90037): Fix all incorrect return type of an async functions. This diagnostic is emitted by the TypeScript compiler when fix all incorrect return type of an async functions.

Why it happens
  1. 1await used outside an async function, or async/await return type mismatch
How to reproduce

TypeScript compiler reports TS90037 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS90037
// Fix all incorrect return type of an async functions

expected output

error TS90037: Fix all incorrect return type of an async functions

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

Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev

← All TypeScript errors