excess-property-checking

SKILL.md

Object literals get special treatment: TypeScript flags unknown properties.

This catches typos and mistakes that structural typing would miss. But it only applies to object literals - understanding this distinction prevents confusion.

When you see "Object literal may only specify known properties", you've triggered excess property checking.

將對象文字分配給類型化變量時使用。當被“未知屬性”錯誤迷惑時使用。當在對象字面量上標記額外屬性而不是變量時使用。 來源：marius-townhouse/effective-typescript-skills。

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