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Explain why a function with less arguments can be assigned to a variable declared as a function type that has more arguments

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
52/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Stale
Tech stack
typescript
Domain
documentation

Research direction

Start by comparing the TypeScript Wiki FAQ section on function assignability with the Handbook's Assignability of Functions section. Check the surrounding Handbook structure and existing links before moving the explanation. Done means the material is available in the Handbook section with the relevant function-parameter explanation preserved.

Written by the indexing model from the issue text.

Description

Page URL: https://github.com/microsoft/TypeScript/wiki/FAQ#why-are-functions-with-fewer-parameters-assignable-to-functions-that-take-more-parameters

Issue: We already have a section called "Assignability of Functions" in the handbook. I think it would be appropriate to move the wiki section there so it gets more visibility.

Dominant language
TypeScript
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Forks
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Avg merge
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Merged PRs (30d)
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