EC
TS2550
TypeScriptERRORNotableTypeHIGH confidence

Property 'X' does not exist on type 'X'. Do you need to change your target li...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2550): Property 'X' does not exist on type 'X'. Do you need to change your target library? Try changing the 'lib' compiler option to 'X' or later.. This diagnostic is emitted by the TypeScript compiler when property 'X' does not exist on type 'X'. Do you need to change your target library? Try changing the 'lib' compiler option to 'X' or later..

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

TypeScript compiler reports TS2550 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2550
// Property 'X' does not exist on type 'X'. Do you need to change your target library? Try changing the 'lib' compiler option to 'X' or later.

expected output

error TS2550: Property 'X' does not exist on type 'X'. Do you need to change your target library? Try changing the 'lib' compiler option to 'X' or later.

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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