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Add note about externals and interface files #172

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Jan 5, 2021
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Add note about externals and interface files #172

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2 changes: 2 additions & 0 deletions pages/docs/manual/latest/external.mdx
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Expand Up @@ -78,6 +78,8 @@ However, if you want to more rigidly bind to the JavaScript library you want, ke

Additionally, no extra ReScript-specific runtime is better for output readability.

> **Note:** do also use `external`s and the `@bs.blabla` attributes in the interface files. Otherwise the inlining won't happen.

## Design Decisions

ReScript takes interoperating with existing code very seriously. Our type system has very strong guarantees. However, such strong feature also means that, without a great interop system, it'd be very hard to gradually convert a codebase over to ReScript. Fortunately, our interop are comprehensive and cooperate very well with most existing JavaScript code.
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