EC
TS90053
TypeScriptERRORNotableConfigHIGH confidence

Declare a private field named 'X'.

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS90053): Declare a private field named 'X'.. This diagnostic is emitted by the TypeScript compiler when declare a private field named 'X'..

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

TypeScript compiler reports TS90053 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS90053
// Declare a private field named 'X'.

expected output

error TS90053: Declare a private field named 'X'.

Fix

Fix the tsconfig.json option

WHEN When a compiler option is invalid or missing

Fix the tsconfig.json option
// tsconfig.json
{
  "compilerOptions": {
    // Review and correct the flagged option
  }
}
// Run: npx tsc --showConfig to see effective config

Why this works

TypeScript validates tsconfig.json options; check the official tsconfig reference for valid values.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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