EC
TS2807
TypeScriptERRORNotableTypeHIGH confidence

This syntax requires an imported helper named 'X' with X parameters, which is...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2807): This syntax requires an imported helper named 'X' with X parameters, which is not compatible with the one in 'X'. Consider upgrading your version of 'X'.. This diagnostic is emitted by the TypeScript compiler when this syntax requires an imported helper named 'X' with X parameters, which is not compatible with the one in 'X'. Consider upgrading your version of 'X'..

Why it happens
  1. 1The value type does not match the declared or expected type
  2. 2A type narrowing or assertion is needed
How to reproduce

TypeScript compiler reports TS2807 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2807
// This syntax requires an imported helper named 'X' with X parameters, which is not compatible with the one in 'X'. Consider upgrading your version of 'X'.

expected output

error TS2807: This syntax requires an imported helper named 'X' with X parameters, which is not compatible with the one in 'X'. Consider upgrading your version of 'X'.

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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