EC
TS2401
TypeScriptERRORNotableTypeHIGH confidence

A 'super' call must be a root-level statement within a constructor of a deriv...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2401): A 'super' call must be a root-level statement within a constructor of a derived class that contains initialized properties, parameter properties, or private identifiers.. This diagnostic is emitted by the TypeScript compiler when a 'super' call must be a root-level statement within a constructor of a derived class that contains initialized properties, parameter properties, or private identifiers..

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

TypeScript compiler reports TS2401 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2401
// A 'super' call must be a root-level statement within a constructor of a derived class that contains initialized properties, parameter properties, or private identifiers.

expected output

error TS2401: A 'super' call must be a root-level statement within a constructor of a derived class that contains initialized properties, parameter properties, or private identifiers.

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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