EC
TS18028
TypeScriptERRORNotableTypeHIGH confidence

Private identifiers are only available when targeting ECMAScript 2015 and hig...

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS18028): Private identifiers are only available when targeting ECMAScript 2015 and higher.. This diagnostic is emitted by the TypeScript compiler when private identifiers are only available when targeting ECMAScript 2015 and higher..

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

TypeScript compiler reports TS18028 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS18028
// Private identifiers are only available when targeting ECMAScript 2015 and higher.

expected output

error TS18028: Private identifiers are only available when targeting ECMAScript 2015 and higher.

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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