ts-r
  • Error
  • Reported by the type checker

TS2353

Object literal may only specify known properties, and '{0}' does not exist in type '{1}'.

An object literal has a property its target type doesn't declare (an excess property). Remove it, fix its spelling, or add it to the type.

What it means

Object literals assigned directly to a typed target are checked for extra properties. Properties the target type doesn't know about are usually typos or leftovers.

Example

index.ts
interface Options {
  verbose?: boolean;
}

export const o: Options = { colour: true };
ts-r-check -p tsconfig.json --pretty false ts-r output
index.ts(5,29): error TS2353: Object literal may only specify known properties, and 'colour' does not exist in type 'Options'.

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 remove the property. (When the name is close to a known property, the error is TS2561, which suggests it.)
  • Add the property to the type if it belongs there.