Custom Functions Metadata WebPack Plugin

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library 2.1.7 ·javascript
verified May 27, 2026

A WebPack plugin (v2.1.7) for Office Add-ins that generates the metadata JSON file required by Excel custom functions. It pairs with the Custom Functions runtime to define function names, parameters, and descriptions. This plugin is specific to the Office Add-in development lifecycle and requires WebPack 5. It is part of the Office-Addin-Scripts monorepo maintained by Microsoft. Key differentiators: it auto-generates metadata from JavaScript/TypeScript comments, integrates tightly with WebPack 5, and is the official Microsoft tool for enabling Excel custom functions in web add-ins.

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