EC
TS17011
TypeScriptERRORNotableTypeHIGH confidence

'super' must be called before accessing a property of 'super' in the construc...

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS17011): 'super' must be called before accessing a property of 'super' in the constructor of a derived class.. This diagnostic is emitted by the TypeScript compiler when 'super' must be called before accessing a property of 'super' in the constructor of a derived class..

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

TypeScript compiler reports TS17011 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS17011
// 'super' must be called before accessing a property of 'super' in the constructor of a derived class.

expected output

error TS17011: 'super' must be called before accessing a property of 'super' in the constructor of a derived class.

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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