EC
TS2337
TypeScriptERRORNotableTypeHIGH confidence

Super calls are not permitted outside constructors or in nested functions ins...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2337): Super calls are not permitted outside constructors or in nested functions inside constructors.. This diagnostic is emitted by the TypeScript compiler when super calls are not permitted outside constructors or in nested functions inside constructors..

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

TypeScript compiler reports TS2337 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2337
// Super calls are not permitted outside constructors or in nested functions inside constructors.

expected output

error TS2337: Super calls are not permitted outside constructors or in nested functions inside constructors.

Fix

Address the TypeScript diagnostic

WHEN When this error is reported by the compiler

Address the TypeScript diagnostic
// Run the TypeScript compiler for details:
npx tsc --noEmit
// Use the TypeScript playground to test your code:
// https://www.typescriptlang.org/play

Why this works

Review the full error message and location; the TypeScript handbook provides guidance on each error category.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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