Add inline reified version of encodeToString as a Json member to to s…

…treamline experience for newcomers. (#2853)

decodeFromString was already there for @FormatLanguage reasons.

Fixes #2850

formats/json/api/kotlinx-serialization-json.klib.api

@@ -308,6 +308,7 @@ sealed class kotlinx.serialization.json/Json : kotlinx.serialization/StringForma
     final fun <#A1: kotlin/Any?> encodeToString(kotlinx.serialization/SerializationStrategy<#A1>, #A1): kotlin/String // kotlinx.serialization.json/Json.encodeToString|encodeToString(kotlinx.serialization.SerializationStrategy<0:0>;0:0){0§<kotlin.Any?>}[0]
     final fun parseToJsonElement(kotlin/String): kotlinx.serialization.json/JsonElement // kotlinx.serialization.json/Json.parseToJsonElement|parseToJsonElement(kotlin.String){}[0]
     final inline fun <#A1: reified kotlin/Any?> decodeFromString(kotlin/String): #A1 // kotlinx.serialization.json/Json.decodeFromString|decodeFromString(kotlin.String){0§<kotlin.Any?>}[0]
+    final inline fun <#A1: reified kotlin/Any?> encodeToString(#A1): kotlin/String // kotlinx.serialization.json/Json.encodeToString|encodeToString(0:0){0§<kotlin.Any?>}[0]
 
     final object Default : kotlinx.serialization.json/Json // kotlinx.serialization.json/Json.Default|null[0]
 }

formats/json/commonMain/src/kotlinx/serialization/json/Json.kt

@@ -129,22 +129,6 @@ public sealed class Json(
         }
     }
 
-    /**
-     * Decodes and deserializes the given JSON [string] to the value of type [T] using deserializer
-     * retrieved from the reified type parameter.
-     * Example:
-     * ```
-     * @Serializable
-     * data class Project(val name: String, val language: String)
-     * //  Project(name=kotlinx.serialization, language=Kotlin)
-     * println(Json.decodeFromString<Project>("""{"name":"kotlinx.serialization","language":"Kotlin"}"""))
-     * ```
-     *
-     * @throws SerializationException in case of any decoding-specific error
-     * @throws IllegalArgumentException if the decoded input is not a valid instance of [T]
-     */
-    public inline fun <reified T> decodeFromString(@FormatLanguage("json", "", "") string: String): T =
-            decodeFromString(serializersModule.serializer(), string)
 
     /**
      * Deserializes the given JSON [string] into a value of type [T] using the given [deserializer].
@@ -194,6 +178,48 @@ public sealed class Json(
     public fun parseToJsonElement(@FormatLanguage("json", "", "") string: String): JsonElement {
         return decodeFromString(JsonElementSerializer, string)
     }
+
+    /**
+     * Following functions are copied from extensions on StringFormat
+     * to streamline experience for newcomers, since IDE does not star-import kotlinx.serialization.* automatically
+     */
+
+    /**
+     * Serializes the [value] of type [T] into an equivalent JSON using serializer
+     * retrieved from the reified type parameter.
+     *
+     * Example of usage:
+     * ```
+     * @Serializable
+     * class Project(val name: String, val language: String)
+     *
+     * val data = Project("kotlinx.serialization", "Kotlin")
+     *
+     * // Prints {"name":"kotlinx.serialization","language":"Kotlin"}
+     * println(Json.encodeToString(data))
+     * ```
+     *
+     * @throws [SerializationException] if the given value cannot be serialized to JSON.
+     */
+    public inline fun <reified T> encodeToString(value: T): String =
+        encodeToString(serializersModule.serializer(), value)
+
+    /**
+     * Decodes and deserializes the given JSON [string] to the value of type [T] using deserializer
+     * retrieved from the reified type parameter.
+     * Example:
+     * ```
+     * @Serializable
+     * data class Project(val name: String, val language: String)
+     * //  Project(name=kotlinx.serialization, language=Kotlin)
+     * println(Json.decodeFromString<Project>("""{"name":"kotlinx.serialization","language":"Kotlin"}"""))
+     * ```
+     *
+     * @throws SerializationException in case of any decoding-specific error
+     * @throws IllegalArgumentException if the decoded input is not a valid instance of [T]
+     */
+    public inline fun <reified T> decodeFromString(@FormatLanguage("json", "", "") string: String): T =
+        decodeFromString(serializersModule.serializer(), string)
 }
 
 /**