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Add more information about class-string

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Matthew Brown 2019-06-09 15:22:26 -04:00
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docs/annotating_code/type_syntax/scalar_types.md
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@ -31,6 +31,8 @@ function takesClassName(string $s) : void {}
`takesClassName("A");` would trigger a `TypeCoercion` issue (or a `PossiblyInvalidArgument` issue if [`allowCoercionFromStringToClassConst`](../running_psalm/configuration.md#coding-style) was set to `false` in your config), whereas `takesClassName(A::class)` is fine.
You can also parameterize `class-string` with an object name e.g. [`class-string<Foo>`](value_types.md#regular-class-constants). This tells Psalm that any matching type must either be a class string of `Foo` or one of its descendants.
### trait-string
Psalm also supports a `trait-string` annotation denote a trait that exists.