| cue export schema.cue | |
| cmp stdout expect-stdout-cue | |
| -- frontmatter.toml -- | |
| title = "Definitions" | |
| description = "" | |
| -- text.md -- | |
| In CUE, schema are typically written as Definitions, | |
| using a `::` instead of `:`. | |
| This tells CUE that they are to be used for validation and should | |
| not be output as data; it is okay for them to remain unspecified. | |
| A definition also tells CUE the full set of allowed fields. | |
| In other words, definitions define "closed" structs. | |
| Including a `...` in struct keeps it open. | |
| -- schema.cue -- | |
| Conn :: { | |
| address: string | |
| port: int | |
| protocol: string | |
| // ... // uncomment this to allow any field | |
| } | |
| lossy: Conn & { | |
| address: "1.2.3.4" | |
| port: 8888 | |
| protocol: "udp" | |
| // foo: 2 // uncomment this to get an error | |
| } | |
| -- expect-stdout-cue -- | |
| { | |
| "lossy": { | |
| "address": "1.2.3.4", | |
| "port": 8888, | |
| "protocol": "udp" | |
| } | |
| } |