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Add field annotations docs #139

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Add field annotations docs #139

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19 changes: 19 additions & 0 deletions docs/src/usage/annotations.md
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Expand Up @@ -103,7 +103,26 @@ This would generate the following Kotlin code:
typealias Options = String
```

### Override Type for a Field

You can also use language-specific arguments to tell Typeshare to treat
the a field as a type in a particular output language. For example,
```rust
#[typeshare]
struct MyStruct {
#[typeshare(typescript(type = "0 | 1"))]
oneOrZero: u8,
}
```
would generate the following Typescript code:
```typescript
export interface MyStruct {
oneOrZero: 0 | 1;
}
```
The `type` argument is supported for all output languages, however Typescript
also supports the optional `readonly` argument (e.g. `typescript(readonly, type= "0 | 1")`)
to make the output property readonly.

## The `#[serde]` Attribute

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