Files
react-native/packages/react-native-codegen
Rick Hanlon 6874bade43 Add parser support for number unions as Int32 enums
Summary:
## Overview

This diff adds flow parser support for number unions as Int32Enums

The following will be supported as an Int32 enum:

```
interval?: WithDefault<0 | 15 | 30 | 60, 0>,
```

## Number type issues
We assume that all number enums are ints (so far there's not been a valid use case for unions of floats).

If we think there would be a use case for float unions we would need to update this to something like:

```
// Int32
intervalInt?: WithDefault<Int32Enum<0 | 15 | 30 | 60>, 0>,

// Float
intervalInt?: WithDefault<FloatEnum<0.0 | 15.1 | 30.2 | 60.3>, 0.0>,
```

My recommendation is that we default number unions to ints and if a use case arises later for floats, we would add the Float support as:

```
// Int32
intervalInt?: WithDefault<0 | 15 | 30 | 60, 0>,

// Float
intervalInt?: WithDefault<FloatEnum<0.0 | 15.1 | 30.2 | 60.3>, 0.0>,
```

Reviewed By: JoshuaGross

Differential Revision: D17161701

fbshipit-source-id: 4b016eee45bf28bf505afd14a6c1aeea6ca8c04f
2019-09-06 05:33:08 -07:00
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