ts-r
  • Error
  • Reported by the type checker

TS2339

Property '{0}' does not exist on type '{1}'.

A property is read on a type that doesn't declare it. Check the spelling, narrow a union first, or add the property to the type.

What it means

The type of the expression before the . has no member with that name. On a union, the property must exist on every member. Values typed {} or object have no properties.

Example

index.ts
const user = { name: "Ada" };

export const email = user.email;
ts-r-check -p tsconfig.json --pretty false ts-r output
index.ts(3,27): error TS2339: Property 'email' does not exist on type '{ name: string; }'.

Recorded by node scripts/verify-examples.mjs with ts-r built from commit 6deaf01. The example uses the default tsconfig: strict, target: es2022, module: esnext, moduleResolution: bundler.

How to fix

  • Fix the spelling, or add the property to the type.
  • For a union, narrow first (if ("email" in user), a discriminant check, or typeof).
  • For data from outside the program, declare its type and validate it.