EC
TS2516
TypeScriptERRORNotableTypeHIGH confidence

All declarations of an abstract method must be consecutive.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2516): All declarations of an abstract method must be consecutive.. This diagnostic is emitted by the TypeScript compiler when all declarations of an abstract method must be consecutive..

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

TypeScript compiler reports TS2516 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2516
// All declarations of an abstract method must be consecutive.

expected output

error TS2516: All declarations of an abstract method must be consecutive.

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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