EC
TS9006
TypeScriptERRORNotableTypeHIGH confidence

Declaration emit for this file requires using private name 'X' from module 'X...

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS9006): Declaration emit for this file requires using private name 'X' from module 'X'. An explicit type annotation may unblock declaration emit.. This diagnostic is emitted by the TypeScript compiler when declaration emit for this file requires using private name 'X' from module 'X'. An explicit type annotation may unblock declaration emit..

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

TypeScript compiler reports TS9006 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS9006
// Declaration emit for this file requires using private name 'X' from module 'X'. An explicit type annotation may unblock declaration emit.

expected output

error TS9006: Declaration emit for this file requires using private name 'X' from module 'X'. An explicit type annotation may unblock declaration emit.

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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