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Clarified parsing properties of tables in the presence of singleton types (#207)

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Alan Jeffrey 2021-11-16 14:48:01 -06:00 • committed by GitHub
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rfcs/syntax-singleton-types.md
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@ -48,6 +48,18 @@ type Animals = "Dog" | "Cat" | "Bird"
type TrueOrNil = true?
```
Adding constant strings as type means that it is now legal to write
`{["foo"]:T}` as a table type. This should be parsed as a property,
not an indexer. For example:
```lua
type T = {
["foo"]: number,
["$$bar"]: string,
baz: boolean,
}
```
The table type `T` is a table with three properties and no indexer.
### Semantics
You are allowed to provide a constant value to the generic primitive type.