EC
TS1519
TypeScriptERRORNotableSyntaxHIGH confidence

Operators must not be mixed within a character class. Wrap it in a nested cla...

Production Risk

Build will fail; resolve before shipping.

What this means

A syntax error (TS1519): Operators must not be mixed within a character class. Wrap it in a nested class instead.. This diagnostic is emitted by the TypeScript compiler when operators must not be mixed within a character class. Wrap it in a nested class instead..

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

TypeScript compiler reports TS1519 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS1519
// Operators must not be mixed within a character class. Wrap it in a nested class instead.

expected output

error TS1519: Operators must not be mixed within a character class. Wrap it in a nested class instead.

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

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

← All TypeScript errors