EC
TS1111
TypeScriptERRORNotableSyntaxHIGH confidence

Private field 'X' must be declared in an enclosing class.

Production Risk

Build will fail; resolve before shipping.

What this means

A syntax error (TS1111): Private field 'X' must be declared in an enclosing class.. This diagnostic is emitted by the TypeScript compiler when private field 'X' must be declared in an enclosing class..

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

TypeScript compiler reports TS1111 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS1111
// Private field 'X' must be declared in an enclosing class.

expected output

error TS1111: Private field 'X' must be declared in an enclosing class.

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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