EC
TS2356
TypeScriptERRORNotableTypeHIGH confidence

An arithmetic operand must be of type 'any', 'number', 'bigint' or an enum type.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2356): An arithmetic operand must be of type 'any', 'number', 'bigint' or an enum type.. This diagnostic is emitted by the TypeScript compiler when an arithmetic operand must be of type 'any', 'number', 'bigint' or an enum type..

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

TypeScript compiler reports TS2356 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2356
// An arithmetic operand must be of type 'any', 'number', 'bigint' or an enum type.

expected output

error TS2356: An arithmetic operand must be of type 'any', 'number', 'bigint' or an enum type.

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.

What not to do

✕ Suppress with @ts-ignore instead of fixing the type

ts-ignore hides real type errors and makes refactoring unsafe.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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