EC
TS2684
TypeScriptERRORNotableTypeHIGH confidence

The 'this' context of type 'X' is not assignable to method's 'this' of type 'X'.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2684): The 'this' context of type 'X' is not assignable to method's 'this' of type 'X'.. This diagnostic is emitted by the TypeScript compiler when the 'this' context of type 'X' is not assignable to method's 'this' of type '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 TS2684 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2684
// The 'this' context of type 'X' is not assignable to method's 'this' of type 'X'.

expected output

error TS2684: The 'this' context of type 'X' is not assignable to method's 'this' of type 'X'.

Fix

Fix the type mismatch

WHEN When the value type does not match the target type

Fix the type mismatch
// Add a type assertion if you are certain of the type
const value = someValue as ExpectedType;
// Or fix the source type to match

Why this works

Type assertions bypass type checking; prefer fixing the underlying type mismatch.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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