EC
TS2870
TypeScriptERRORNotableTypeHIGH confidence

This binary expression is never nullish. Are you missing parentheses?

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2870): This binary expression is never nullish. Are you missing parentheses?. This diagnostic is emitted by the TypeScript compiler when this binary expression is never nullish. Are you missing parentheses?.

Why it happens
  1. 1A code path that should return a value returns never instead, or vice versa
How to reproduce

TypeScript compiler reports TS2870 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2870
// This binary expression is never nullish. Are you missing parentheses?

expected output

error TS2870: This binary expression is never nullish. Are you missing parentheses?

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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