Precompile (Manifold :: Core Runtime 2026.1.6 API)

```
@Retention(SOURCE)
@Repeatable(Precompiles.class)
@Deprecated
public @interface Precompile
```
Deprecated.
Use -Amanifold.resource.<file-ext>=[type-name-regex] javac command line arguments.
Use @Precompile to instruct Manifold to precompile classes from a specified type manifold. This is useful for cases where a type manifold produces a static API for others to use. Note you maybe provide more than one instance of @Precompile to precompile types from more than one type manifold:
```
 @Precompile(fileExtension = "json")
 @Precompile(fileExtension = "yml") 
```
This instructs the Java compiler to precompile all JSON and YAML in the enclosing module.
The default behavior:
```
 @Precompile() 
```
compiles all types from all type manifolds used in the module.

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`String`	`fileExtension`	Deprecated. A file extension name e.g., `"json"`, handled by the Type Manifold class defining the domain of types to compile.
`Class<?>`	`typeManifold`	Deprecated. The Type Manifold class defining the domain of types to compile from.
`String`	`typeNames`	Deprecated. A regular expression defining the range of types that should be compiled from `typeManifold()` or `fileExtension()` via `ITypeManifold#getAllTypeNames()`.

- Element Detail
  - typeManifold
```
Class<?> typeManifold
```
    Deprecated.
    
    The Type Manifold class defining the domain of types to compile from.
    Use fileExtension() as a convenient alternative way to specify the type manifold via a file extension it handles.
    
    Default:
    
    java.lang.Object.class
- - fileExtension
```
String fileExtension
```
    Deprecated.
    
    A file extension name e.g., "json", handled by the Type Manifold class defining the domain of types to compile. This value is an alternative to typeManifold() as a simple way to indirectly specify the ITypeManifold. If both arguments are present, typeManifold() has precedence.
    The default wildcard value "*" precompiles types from all type manifolds used in the module
    
    Default:
    
    "*"
- - typeNames
```
String typeNames
```
    Deprecated.
    
    A regular expression defining the range of types that should be compiled from typeManifold() or fileExtension() via ITypeManifold#getAllTypeNames(). The default value ".*" compiles all types originating from the specified type manifold.
    
    Default:
    
    ".*"