如何通过kotlinpoet生成带有typealias参数的类

implementation 'com.squareup:kotlinpoet:1.10.0'

import com.squareup.kotlinpoet.*
import com.squareup.kotlinpoet.ParameterizedTypeName.Companion.parameterizedBy

fun main() {
    val className = ClassName("com.example", "MyClass")
    val typeAliasName = ClassName("com.example", "MyTypeAlias")

    val typeAlias = TypeAliasSpec.builder("MyTypeAlias", typeAliasName)
        .addModifiers(KModifier.PUBLIC)
        .addTypeVariable(TypeVariableName("T"))
        .addType(TypeVariableName("T").copy(nullable = true))
        .build()

    val classSpec = TypeSpec.classBuilder(className)
        .addTypeAlias(typeAlias)
        .build()

    val fileSpec = FileSpec.builder("com.example", "MyClass")
        .addType(classSpec)
        .build()

    fileSpec.writeTo(System.out)
}

package com.example

typealias MyTypeAlias<T> = T?

class MyClass