Types
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package ir
Array type.
Array type.
Class (or interface) type.
Class (or interface) type.
Record type.
Record type. Used by the optimizer to inline classes as records with multiple fields. They are desugared as several local variables by JSDesugaring. Record types cannot cross method boundaries, so they cannot appear as the type of fields or parameters, nor as result types of methods. The compiler itself never generates record types.
Type of a term (expression or statement) in the IR.
Type of a term (expression or statement) in the IR.
There is a many-to-one relationship from TypeRefs to Types,
because java.lang.Object and raw JS types all collapse to AnyType.
In fact, there are two Types that do not have any real equivalent in
type refs: StringType and UndefType, as they refer to the
non-null variants of java.lang.String and scala.runtime.BoxedUnit,
respectively.
Type reference (allowed for classOf[], is/asInstanceOf[]).
Type reference (allowed for classOf[], is/asInstanceOf[]).
A TypeRef has exactly the same level of precision as a JVM type.
There is a one-to-one relationship between a TypeRef and an instance of
java.lang.Class at run-time. This means that:
TypeRef (including scala.Byte and
scala.Short), and they are different from their boxed versions.any A TypeRef therefore uniquely identifies a classOf[T]. It is also the
type refs that are used in method signatures, and which therefore dictate
JVM/IR overloading.
Any type (the top type of this type system).
Any type (the top type of this type system).
A variable of this type can contain any value, including undefined
and null and any raw JS value. This type supports a very limited set
of Scala operations, the ones common to all values. Basically only
reference equality tests and instance tests. It also supports all
JavaScript operations, since all Scala objects are also genuine
JavaScript objects.
The type java.lang.Object in the back-end maps to AnyType because it
can hold raw JS values (not only instances of Scala.js classes).
Boolean type.
Boolean type.
It does not accept null nor undefined.
8-bit signed integer type.
8-bit signed integer type.
It does not accept null nor undefined.
Char type, a 16-bit UTF-16 code unit.
Char type, a 16-bit UTF-16 code unit.
It does not accept null nor undefined.
Double type (64-bit).
Double type (64-bit).
It does not accept null nor undefined.
Float type (32-bit).
Float type (32-bit).
It does not accept null nor undefined.
32-bit signed integer type.
32-bit signed integer type.
It does not accept null nor undefined.
64-bit signed integer type.
64-bit signed integer type.
It does not accept null nor undefined.
No type.
Nothing type (the bottom type of this type system).
Nothing type (the bottom type of this type system).
Expressions from which one can never come back are typed as Nothing.
For example, throw and return.
The type of null.
The type of null.
It does not accept undefined.
The null type is a subtype of all class types and array types.
16-bit signed integer type.
16-bit signed integer type.
It does not accept null nor undefined.
String type.
String type.
It does not accept null nor undefined.
The type of undefined.
Tests whether a type lhs is a subtype of rhs (or equal).
Tests whether a type lhs is a subtype of rhs (or equal).
NoType is never a subtype or supertype of anything (including
itself). All other types are subtypes of themselves.
A function testing whether a class/interface is a subclass of another class/interface.
Generates a literal zero of the given type.