EC
TS1318
TypeScriptERRORNotableSyntaxHIGH confidence

An abstract accessor cannot have an implementation.

Production Risk

Build will fail; resolve before shipping.

What this means

A syntax error (TS1318): An abstract accessor cannot have an implementation.. This diagnostic is emitted by the TypeScript compiler when an abstract accessor cannot have an implementation..

Why it happens
  1. 1The function overload signatures do not match the implementation
How to reproduce

TypeScript compiler reports TS1318 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS1318
// An abstract accessor cannot have an implementation.

expected output

error TS1318: An abstract accessor cannot have an implementation.

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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