EC
TS2612
TypeScriptERRORNotableTypeHIGH confidence

Property 'X' will overwrite the base property in 'X'. If this is intentional,...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2612): Property 'X' will overwrite the base property in 'X'. If this is intentional, add an initializer. Otherwise, add a 'declare' modifier or remove the redundant declaration.. This diagnostic is emitted by the TypeScript compiler when property 'X' will overwrite the base property in 'X'. If this is intentional, add an initializer. Otherwise, add a 'declare' modifier or remove the redundant declaration..

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

TypeScript compiler reports TS2612 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2612
// Property 'X' will overwrite the base property in 'X'. If this is intentional, add an initializer. Otherwise, add a 'declare' modifier or remove the redundant declaration.

expected output

error TS2612: Property 'X' will overwrite the base property in 'X'. If this is intentional, add an initializer. Otherwise, add a 'declare' modifier or remove the redundant declaration.

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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