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TS2551: Property 'X' does not exist on type 'Y'. Did you mean 'Z'?

You accessed a property that doesn't exist on the type, but TypeScript found a similarly-named property and is suggesting you may have made a typo. This is TS2339 with a helpful spelling suggestion attached.

Common causes

A typo in the property name — swapped letters, wrong case, or a missing/extra character
Using camelCase when the actual property is snake_case, or vice versa
Remembering a library API property name slightly wrong
A property was renamed in a newer version of the library

How to fix it

Fix the typo to match the suggested property name
Use IDE autocomplete to avoid misspellings — TypeScript's language server provides completions
If you intentionally want a different name, add it to the type definition
Check the library's changelog if this worked before — the API may have been renamed

Example

const arr = [1, 2, 3];
console.log(arr.lenght);
// error TS2551: Property 'lenght' does not exist on type 'number[]'. Did you mean 'length'?

Typo in the array property name — lenght instead of length

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