EC
TS90007
TypeScriptERRORNotableConfigHIGH confidence

Implement inherited abstract class

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS90007): Implement inherited abstract class. This diagnostic is emitted by the TypeScript compiler when implement inherited abstract class.

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

TypeScript compiler reports TS90007 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS90007
// Implement inherited abstract class

expected output

error TS90007: Implement inherited abstract class

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

Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev

← All TypeScript errors