EC
TS2742
TypeScriptERRORNotableTypeHIGH confidence

The inferred type of 'X' cannot be named without a reference to 'X'. This is ...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2742): The inferred type of 'X' cannot be named without a reference to 'X'. This is likely not portable. A type annotation is necessary.. This diagnostic is emitted by the TypeScript compiler when the inferred type of 'X' cannot be named without a reference to 'X'. This is likely not portable. A type annotation is necessary..

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

TypeScript compiler reports TS2742 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2742
// The inferred type of 'X' cannot be named without a reference to 'X'. This is likely not portable. A type annotation is necessary.

expected output

error TS2742: The inferred type of 'X' cannot be named without a reference to 'X'. This is likely not portable. A type annotation is necessary.

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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