EC
TS2715
TypeScriptERRORNotableTypeHIGH confidence

Abstract property 'X' in class 'X' cannot be accessed in the constructor.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2715): Abstract property 'X' in class 'X' cannot be accessed in the constructor.. This diagnostic is emitted by the TypeScript compiler when abstract property 'X' in class 'X' cannot be accessed in the constructor..

Why it happens
  1. 1A concrete class extends an abstract class but does not implement all abstract members
How to reproduce

TypeScript compiler reports TS2715 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2715
// Abstract property 'X' in class 'X' cannot be accessed in the constructor.

expected output

error TS2715: Abstract property 'X' in class 'X' cannot be accessed in the constructor.

Fix

Implement all abstract members

WHEN Extending an abstract class

Implement all abstract members
abstract class Base {
  abstract doWork(): void;
}
class Derived extends Base {
  doWork(): void { /* implementation */ }
}

Why this works

All abstract members must be implemented in concrete subclasses.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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