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.

Use when assigning object literals to typed variables. Use when confused by "unknown property" errors. Use when extra properties are flagged on object literals but not variables. Source: marius-townhouse/effective-typescript-skills.

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