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Add support for leading vertical bar in union types #320

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merged 3 commits into from
Jun 14, 2017
Merged

Add support for leading vertical bar in union types #320

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0057589
Add support for leading vertical bar in union types
alexandrebodin Jun 13, 2017
5e4970a
Add precisions to vertical bar usage
alexandrebodin Jun 13, 2017
e7a94e2
Change wording, Add example for unsupported trailing vertical bar
alexandrebodin Jun 14, 2017
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22 changes: 22 additions & 0 deletions spec/Section 3 -- Type System.md
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Expand Up @@ -755,6 +755,28 @@ Union types have the potential to be invalid if incorrectly defined.
Similarly, wrapping types may not be member types of a Union.
2. A Union type must define one or more unique member types.

#### Union type syntax

Union types are defined by delimiting one or more types with a single vertical bar character `|`:

```graphql
union SearchResult = Photo | Person
```

You may also use a leading vertical bar:

```graphql
union SearchResult =
| Photo
| Person
```

Trailing delimiters are not supported:

```!graphql
union SearchResult = Photo | Person |
```

### Enums

GraphQL Enums are a variant on the Scalar type, which represents one of a
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