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15 changes: 14 additions & 1 deletion website/docs/types/mapped-types.md
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Expand Up @@ -134,6 +134,19 @@ type MappedType = {[key in Union]: number};
To use mapped types, you need to upgrade your infrastructure so that it supports the syntax:

- `flow` and `flow-parser`: 0.210.0. Between v0.210.0 to v0.211.1, you need to explicitly enable it in your .flowconfig, under the `[options]` heading, add `mapped_type=true`.
- `prettier`: 3
- `prettier`: 3. Using hermes-parser via [prettier-plugin-hermes-parser](https://npmjs.com/package/prettier-plugin-hermes-parser):
```json
{
"plugins": ["prettier-plugin-hermes-parser"],
"overrides": [
{
"files": ["*.js", "*.jsx", "*.flow"],
"options": {
"parser": "hermes"
}
}
]
}
```
- `babel` with `babel-plugin-syntax-hermes-parser`. See [our Babel guide](../../tools/babel/) for setup instructions.
- `eslint` with `hermes-eslint`. See [our ESLint guide](../../tools/eslint/) for setup instructions.