[Kotlin] Introduce support for Kotlin Explicit API Mode for Kotlin-Client generator (resolve #16506)

.github/workflows/samples-kotlin-client.yaml

@@ -20,6 +20,7 @@ jobs:
         sample:
           # client
           - samples/client/petstore/kotlin
+          - samples/client/petstore/kotlin-explicit
           - samples/client/petstore/kotlin-gson
           - samples/client/petstore/kotlin-jackson
           - samples/client/petstore/kotlin-model-prefix-type-mappings

bin/configs/kotlin-explicit.yaml

@@ -0,0 +1,7 @@
+generatorName: kotlin
+outputDir: samples/client/petstore/kotlin-explicit
+inputSpec: modules/openapi-generator/src/test/resources/2_0/petstore.yaml
+templateDir: modules/openapi-generator/src/main/resources/kotlin-client
+additionalProperties:
+  artifactId: kotlin-petstore-explicit
+  explicitApi: "true"

docs/generators/kotlin.md

@@ -25,6 +25,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |collectionType|Option. Collection type to use|<dl><dt>**array**</dt><dd>kotlin.Array</dd><dt>**list**</dt><dd>kotlin.collections.List</dd></dl>|list|
 |dateLibrary|Option. Date library to use|<dl><dt>**threetenbp-localdatetime**</dt><dd>Threetenbp - Backport of JSR310 (jvm only, for legacy app only)</dd><dt>**kotlinx-datetime**</dt><dd>kotlinx-datetime (preferred for multiplatform)</dd><dt>**string**</dt><dd>String</dd><dt>**java8-localdatetime**</dt><dd>Java 8 native JSR310 (jvm only, for legacy app only)</dd><dt>**java8**</dt><dd>Java 8 native JSR310 (jvm only, preferred for jdk 1.8+)</dd><dt>**threetenbp**</dt><dd>Threetenbp - Backport of JSR310 (jvm only, preferred for jdk &lt; 1.8)</dd></dl>|java8|
 |enumPropertyNaming|Naming convention for enum properties: 'camelCase', 'PascalCase', 'snake_case', 'UPPERCASE', and 'original'| |original|
+|explicitApi|Generates code with explicit access modifiers to comply with Kotlin Explicit API Mode.| |false|
 |failOnUnknownProperties|Fail Jackson de-serialization on unknown properties| |false|
 |generateOneOfAnyOfWrappers|Generate oneOf, anyOf schemas as wrappers.| |false|
 |generateRoomModels|Generate Android Room database models in addition to API models (JVM Volley library only)| |false|
@@ -34,6 +35,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |mapFileBinaryToByteArray|Map File and Binary to ByteArray (default: false)| |false|
 |modelMutable|Create mutable models| |false|
 |moshiCodeGen|Whether to enable codegen with the Moshi library. Refer to the [official Moshi doc](https://github.com/square/moshi#codegen) for more info.| |false|
+|nonPublicApi|Generates code with reduced access modifiers; allows embedding elsewhere without exposing non-public API calls to consumers.| |false|
 |nullableReturnType|Nullable return type| |false|
 |omitGradlePluginVersions|Whether to declare Gradle plugin versions in build files.| |false|
 |omitGradleWrapper|Whether to omit Gradle wrapper for creating a sub project.| |false|

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/KotlinClientCodegen.java

@@ -90,6 +90,7 @@ public class KotlinClientCodegen extends AbstractKotlinCodegen {
 
     public static final String MOSHI_CODE_GEN = "moshiCodeGen";
 
+    public static final String EXPLICIT_API = "explicitApi";
     public static final String NULLABLE_RETURN_TYPE = "nullableReturnType";
 
     public static final String SUPPORT_ANDROID_API_LEVEL_25_AND_BELLOW = "supportAndroidApiLevel25AndBelow";
@@ -268,6 +269,8 @@ public KotlinClientCodegen() {
         cliOptions.add(CliOption.newBoolean(MOSHI_CODE_GEN, "Whether to enable codegen with the Moshi library. Refer to the [official Moshi doc](https://github.com/square/moshi#codegen) for more info."));
         cliOptions.add(CliOption.newBoolean(FAIL_ON_UNKNOWN_PROPERTIES, "Fail Jackson de-serialization on unknown properties", false));
 
+        cliOptions.add(CliOption.newBoolean(EXPLICIT_API, "Generates code with explicit access modifiers to comply with Kotlin Explicit API Mode."));
+        cliOptions.add(CliOption.newBoolean(CodegenConstants.NON_PUBLIC_API, CodegenConstants.NON_PUBLIC_API_DESC));
         cliOptions.add(CliOption.newBoolean(NULLABLE_RETURN_TYPE, "Nullable return type"));
 
         cliOptions.add(CliOption.newBoolean(GENERATE_ROOM_MODELS, "Generate Android Room database models in addition to API models (JVM Volley library only)", false));

modules/openapi-generator/src/main/resources/kotlin-client/anyof_class.mustache

@@ -71,7 +71,7 @@ import java.io.IOException
 @Deprecated(message = "This schema is deprecated.")
 {{/isDeprecated}}
 {{>additionalModelTypeAnnotations}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}data class {{classname}}(var actualInstance: Any? = null) {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}data class {{classname}}(var actualInstance: Any? = null) {
 
     class CustomTypeAdapterFactory : TypeAdapterFactory {
         override fun <T> create(gson: Gson, type: TypeToken<T>): TypeAdapter<T>? {

modules/openapi-generator/src/main/resources/kotlin-client/build.gradle.mustache

@@ -99,6 +99,11 @@ idea {
     }
 }
 {{/idea}}
+{{#explicitApi}}
+kotlin {
+    explicitApi()
+}
+{{/explicitApi}}
 {{#jvm-spring-webclient}}{{#useSpringBoot3}}
 kotlin {
     jvmToolchain {

modules/openapi-generator/src/main/resources/kotlin-client/data_class.mustache

@@ -77,7 +77,7 @@ import {{packageName}}.infrastructure.ITransformForStorage
 {{#vendorExtensions.x-class-extra-annotation}}
 {{{vendorExtensions.x-class-extra-annotation}}}
 {{/vendorExtensions.x-class-extra-annotation}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}{{#discriminator}}interface{{/discriminator}}{{^discriminator}}{{#hasVars}}data {{/hasVars}}class{{/discriminator}} {{classname}}{{^discriminator}} (
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}{{#discriminator}}interface{{/discriminator}}{{^discriminator}}{{#hasVars}}data {{/hasVars}}class{{/discriminator}} {{classname}}{{^discriminator}} (
 
 {{#allVars}}
 {{#required}}{{>data_class_req_var}}{{/required}}{{^required}}{{>data_class_opt_var}}{{/required}}{{^-last}},{{/-last}}
@@ -94,7 +94,7 @@ import {{packageName}}.infrastructure.ITransformForStorage
         ){{/discriminator}}
 {{/generateRoomModels}}
 {{#serializableModel}}
-    {{#nonPublicApi}}internal {{/nonPublicApi}}companion object {
+    {{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}companion object {
         private const val serialVersionUID: Long = 123
     }
 {{/serializableModel}}
@@ -120,7 +120,7 @@ import {{packageName}}.infrastructure.ITransformForStorage
     {{#multiplatform}}
     @Serializable
     {{/multiplatform}}
-    {{#nonPublicApi}}internal {{/nonPublicApi}}enum class {{{nameInPascalCase}}}(val value: {{^isContainer}}{{dataType}}{{/isContainer}}{{#isContainer}}kotlin.String{{/isContainer}}) {
+    {{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}enum class {{{nameInPascalCase}}}({{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}val value: {{^isContainer}}{{dataType}}{{/isContainer}}{{#isContainer}}kotlin.String{{/isContainer}}) {
     {{#allowableValues}}
     {{#enumVars}}
         {{^multiplatform}}

modules/openapi-generator/src/main/resources/kotlin-client/enum_class.mustache

@@ -39,7 +39,7 @@ import kotlinx.serialization.*
 @JsonClass(generateAdapter = false)
 {{/moshi}}
 {{/multiplatform}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}enum class {{classname}}(val value: {{{dataType}}}) {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}enum class {{classname}}({{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}val value: {{{dataType}}}) {
 {{#allowableValues}}{{#enumVars}}
     {{^multiplatform}}
     {{#moshi}}
@@ -79,16 +79,16 @@ import kotlinx.serialization.*
      */
     override fun toString(): kotlin.String = value{{^isString}}.toString(){{/isString}}
 
-    companion object {
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}companion object {
         /**
          * Converts the provided [data] to a [String] on success, null otherwise.
          */
-        fun encode(data: kotlin.Any?): kotlin.String? = if (data is {{classname}}) "$data" else null
+        {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun encode(data: kotlin.Any?): kotlin.String? = if (data is {{classname}}) "$data" else null
 
         /**
          * Returns a valid [{{classname}}] for [data], null otherwise.
          */
-        fun decode(data: kotlin.Any?): {{classname}}? = data?.let {
+        {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun decode(data: kotlin.Any?): {{classname}}? = data?.let {
           val normalizedData = "$it".lowercase()
           values().firstOrNull { value ->
             it == value || normalizedData == "$value".lowercase()

modules/openapi-generator/src/main/resources/kotlin-client/infrastructure/ApiAbstractions.kt.mustache

@@ -1,21 +1,21 @@
 package {{packageName}}.infrastructure
 
-{{#nonPublicApi}}internal {{/nonPublicApi}}typealias MultiValueMap = MutableMap<String,List<String>>
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}typealias MultiValueMap = MutableMap<String,List<String>>
 
-{{#nonPublicApi}}internal {{/nonPublicApi}}fun collectionDelimiter(collectionFormat: String) = when(collectionFormat) {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun collectionDelimiter(collectionFormat: String): String = when(collectionFormat) {
     "csv" -> ","
     "tsv" -> "\t"
     "pipe" -> "|"
     "space" -> " "
     else -> ""
 }
 
-{{#nonPublicApi}}internal {{/nonPublicApi}}val defaultMultiValueConverter: (item: Any?) -> String = { item -> "$item" }
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}val defaultMultiValueConverter: (item: Any?) -> String = { item -> "$item" }
 
-{{#nonPublicApi}}internal {{/nonPublicApi}}fun <T : Any?> toMultiValue(items: Array<T>, collectionFormat: String, map: (item: T) -> String = defaultMultiValueConverter)
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun <T : Any?> toMultiValue(items: Array<T>, collectionFormat: String, map: (item: T) -> String = defaultMultiValueConverter): List<String>
         = toMultiValue(items.asIterable(), collectionFormat, map)
 
-{{#nonPublicApi}}internal {{/nonPublicApi}}fun <T : Any?> toMultiValue(items: Iterable<T>, collectionFormat: String, map: (item: T) -> String = defaultMultiValueConverter): List<String> {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun <T : Any?> toMultiValue(items: Iterable<T>, collectionFormat: String, map: (item: T) -> String = defaultMultiValueConverter): List<String> {
     return when(collectionFormat) {
         "multi" -> items.map(map)
         else -> listOf(items.joinToString(separator = collectionDelimiter(collectionFormat), transform = map))

modules/openapi-generator/src/main/resources/kotlin-client/infrastructure/PartConfig.kt.mustache

@@ -5,7 +5,7 @@ package {{packageName}}.infrastructure
  * NOTE: Headers is a Map<String,String> because rfc2616 defines
  *       multi-valued headers as csv-only.
  */
-{{#nonPublicApi}}internal {{/nonPublicApi}}data class PartConfig<T>(
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}data class PartConfig<T>(
     val headers: MutableMap<String, String> = mutableMapOf(),
     val body: T? = null
 )

modules/openapi-generator/src/main/resources/kotlin-client/infrastructure/RequestConfig.kt.mustache

@@ -8,7 +8,7 @@ package {{packageName}}.infrastructure
  * NOTE: Headers is a Map<String,String> because rfc2616 defines
  *       multi-valued headers as csv-only.
  */
-{{#nonPublicApi}}internal {{/nonPublicApi}}data class RequestConfig<T>(
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}data class RequestConfig<T>(
     val method: RequestMethod,
     val path: String,
     val headers: MutableMap<String, String> = mutableMapOf(),

modules/openapi-generator/src/main/resources/kotlin-client/infrastructure/RequestMethod.kt.mustache

@@ -3,6 +3,6 @@ package {{packageName}}.infrastructure
 /**
  * Provides enumerated HTTP verbs
  */
-{{#nonPublicApi}}internal {{/nonPublicApi}}enum class RequestMethod {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}enum class RequestMethod {
     GET, DELETE, HEAD, OPTIONS, PATCH, POST, PUT
 }

modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/AtomicBooleanAdapter.kt.mustache

@@ -10,7 +10,7 @@ import kotlinx.serialization.descriptors.SerialDescriptor
 import java.util.concurrent.atomic.AtomicBoolean
 
 @Serializer(forClass = AtomicBoolean::class)
-{{#nonPublicApi}}internal {{/nonPublicApi}}object AtomicBooleanAdapter : KSerializer<AtomicBoolean> {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}object AtomicBooleanAdapter : KSerializer<AtomicBoolean> {
     override fun serialize(encoder: Encoder, value: AtomicBoolean) {
         encoder.encodeBoolean(value.get())
     }

modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/AtomicIntegerAdapter.kt.mustache

@@ -10,7 +10,7 @@ import kotlinx.serialization.descriptors.SerialDescriptor
 import java.util.concurrent.atomic.AtomicInteger
 
 @Serializer(forClass = AtomicInteger::class)
-{{#nonPublicApi}}internal {{/nonPublicApi}}object AtomicIntegerAdapter : KSerializer<AtomicInteger> {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}object AtomicIntegerAdapter : KSerializer<AtomicInteger> {
     override fun serialize(encoder: Encoder, value: AtomicInteger) {
         encoder.encodeInt(value.get())
     }

modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/AtomicLongAdapter.kt.mustache

@@ -10,7 +10,7 @@ import kotlinx.serialization.descriptors.SerialDescriptor
 import java.util.concurrent.atomic.AtomicLong
 
 @Serializer(forClass = AtomicLong::class)
-{{#nonPublicApi}}internal {{/nonPublicApi}}object AtomicLongAdapter : KSerializer<AtomicLong> {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}object AtomicLongAdapter : KSerializer<AtomicLong> {
     override fun serialize(encoder: Encoder, value: AtomicLong) {
         encoder.encodeLong(value.get())
     }

modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/BigDecimalAdapter.kt.mustache

@@ -17,21 +17,21 @@ import java.math.BigDecimal
 
 {{#kotlinx_serialization}}
 @Serializer(forClass = BigDecimal::class)
-{{#nonPublicApi}}internal {{/nonPublicApi}}object BigDecimalAdapter : KSerializer<BigDecimal> {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}object BigDecimalAdapter : KSerializer<BigDecimal> {
     override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("BigDecimal", PrimitiveKind.STRING)
     override fun deserialize(decoder: Decoder): BigDecimal = BigDecimal(decoder.decodeString())
     override fun serialize(encoder: Encoder, value: BigDecimal) = encoder.encodeString(value.toPlainString())
 }
 {{/kotlinx_serialization}}
 {{#moshi}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}class BigDecimalAdapter {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}class BigDecimalAdapter {
     @ToJson
-    fun toJson(value: BigDecimal): String {
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun toJson(value: BigDecimal): String {
         return value.toPlainString()
     }
 
     @FromJson
-    fun fromJson(value: String): BigDecimal {
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun fromJson(value: String): BigDecimal {
         return BigDecimal(value)
     }
 }

modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/BigIntegerAdapter.kt.mustache

@@ -17,7 +17,7 @@ import java.math.BigInteger
 
 {{#kotlinx_serialization}}
 @Serializer(forClass = BigInteger::class)
-{{#nonPublicApi}}internal {{/nonPublicApi}}object BigIntegerAdapter : KSerializer<BigInteger> {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}object BigIntegerAdapter : KSerializer<BigInteger> {
     override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("BigInteger", PrimitiveKind.STRING)
     override fun deserialize(decoder: Decoder): BigInteger {
         return BigInteger(decoder.decodeString())
@@ -29,14 +29,14 @@ import java.math.BigInteger
 }
 {{/kotlinx_serialization}}
 {{#moshi}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}class BigIntegerAdapter {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}class BigIntegerAdapter {
     @ToJson
-    fun toJson(value: BigInteger): String {
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun toJson(value: BigInteger): String {
         return value.toString()
     }
 
     @FromJson
-    fun fromJson(value: String): BigInteger {
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun fromJson(value: String): BigInteger {
         return BigInteger(value)
     }
 }

modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/ByteArrayAdapter.kt.mustache

@@ -13,16 +13,16 @@ import java.io.IOException
 {{/gson}}
 
 {{#moshi}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}class ByteArrayAdapter {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}class ByteArrayAdapter {
     @ToJson
-    fun toJson(data: ByteArray): String = String(data)
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun toJson(data: ByteArray): String = String(data)
 
     @FromJson
-    fun fromJson(data: String): ByteArray = data.toByteArray()
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun fromJson(data: String): ByteArray = data.toByteArray()
 }
 {{/moshi}}
 {{#gson}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}class ByteArrayAdapter : TypeAdapter<ByteArray>() {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}class ByteArrayAdapter : TypeAdapter<ByteArray>() {
     @Throws(IOException::class)
     override fun write(out: JsonWriter?, value: ByteArray?) {
         if (value == null) {

modules/openapi-generator/src/main/resources/kotlin-client/jvm-common/infrastructure/InstantAdapter.kt.mustache

@@ -14,21 +14,21 @@ import java.io.IOException
 import kotlinx.datetime.Instant
 
 {{#moshi}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}class InstantAdapter {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}class InstantAdapter {
     @ToJson
-    fun toJson(value: Instant): String {
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun toJson(value: Instant): String {
         return value.toString()
     }
 
     @FromJson
-    fun fromJson(value: String): Instant {
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}fun fromJson(value: String): Instant {
         return Instant.parse(value)
     }
 
 }
 {{/moshi}}
 {{#gson}}
-{{#nonPublicApi}}internal {{/nonPublicApi}}class InstantAdapter : TypeAdapter<Instant>() {
+{{#nonPublicApi}}internal {{/nonPublicApi}}{{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}class InstantAdapter : TypeAdapter<Instant>() {
     @Throws(IOException::class)
     override fun write(out: JsonWriter?, value: Instant?) {
         if (value == null) {