In this guide, you'll learn how to generate a **TypeScript SDK** for your FastAPI backend.

## Open Source SDK Generators { #open-source-sdk-generators }

A versatile option is the [OpenAPI Generator](https://openapi-generator.tech/), which supports **many programming languages** and can generate SDKs from your OpenAPI specification.

### Cachear el esquema de OpenAPI { #cache-the-openapi-schema }

Puedes usar la propiedad `.openapi_schema` como un "cache", para almacenar tu esquema generado.

De esa forma, tu aplicación no tendrá que generar el esquema cada vez que un usuario abra la documentación de tu API.

Se generará solo una vez, y luego se usará el mismo esquema cacheado para las siguientes requests.

    private final OneSizeTestContainerGenerator<BiMap<K, V>, Entry<K, V>> generator;

    public MapGenerator(
        OneSizeTestContainerGenerator<BiMap<K, V>, Entry<K, V>> oneSizeTestContainerGenerator) {
      this.generator = oneSizeTestContainerGenerator;
    }

    @Override
    public SampleElements<Entry<K, V>> samples() {
      return generator.samples();
    }

    @Override

import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * To be implemented by test generators that can produce test subjects without requiring any
 * parameters.
 *
 * @param <T> the type created by this generator.
 * @author George van den Driessche
 */
@GwtCompatible
@NullMarked
public interface TestSubjectGenerator<T extends @Nullable Object> {

                generator.saveImage(input, outputFile);
            }
            assertImageSize(outputFile, 100, 66);

            imagePath = "thumbnail/600x400.gif";
            try (ImageInputStream input = ImageIO.createImageInputStream(classLoader.getResourceAsStream(imagePath))) {
                generator.saveImage(input, outputFile);
            }
            assertImageSize(outputFile, 100, 66);

El diccionario en `openapi_extra` se combinará profundamente con el esquema de OpenAPI generado automáticamente para la *path operation*.

Por lo tanto, podrías añadir datos adicionales al esquema generado automáticamente.

    private final OneSizeTestContainerGenerator<BiMap<K, V>, Entry<K, V>> generator;

    public MapGenerator(
        OneSizeTestContainerGenerator<BiMap<K, V>, Entry<K, V>> oneSizeTestContainerGenerator) {
      this.generator = oneSizeTestContainerGenerator;
    }

    @Override
    public SampleElements<Entry<K, V>> samples() {
      return generator.samples();
    }

    @Override

  painless(project(path: ':modules:lang-painless', configuration: 'zip'))
  api "org.openjdk.jmh:jmh-core:$versions.jmh"
  annotationProcessor "org.openjdk.jmh:jmh-generator-annprocess:$versions.jmh"
  // Dependencies of JMH
  runtimeOnly 'net.sf.jopt-simple:jopt-simple:4.6'
  runtimeOnly 'org.apache.commons:commons-math3:3.2'
}

   * array of the erased type.
   */
  T create(Object... elements);

  /**
   * Helper method to create an array of the appropriate type used by this generator. The returned
   * array will contain only nulls.
   */
  E[] createArray(int length);

  /**
   * Returns the iteration ordering of elements, given the order in which they were added to the

import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * To be implemented by test generators that can produce test subjects without requiring any
 * parameters.
 *
 * @param <T> the type created by this generator.
 * @author George van den Driessche
 */
@GwtCompatible
@NullMarked
public interface TestSubjectGenerator<T extends @Nullable Object> {