Broken code (test)

src/client/java/chickenmanfy/scify/mixin/client/ExampleClientMixin.java

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+package chickenmanfy.scify.mixin.client;
+
+import net.minecraft.client.MinecraftClient;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(MinecraftClient.class)
+public class ExampleClientMixin {
+	@Inject(at = @At("HEAD"), method = "run")
+	private void run(CallbackInfo info) {
+		// This code is injected into the start of MinecraftClient.run()V
+	}
+}

src/client/kotlin/chickenmanfy/scify/SciFyClient.kt

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+package chickenmanfy.scify
+
+import io.github.prospector.modmenu.ModMenu
+import io.github.prospector.modmenu.api.ConfigScreenFactory
+import io.github.prospector.modmenu.api.ModMenuApi
+import net.fabricmc.api.ClientModInitializer
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents
+import net.fabricmc.fabric.api.client.keybinding.v1.KeyBindingHelper
+import net.minecraft.client.MinecraftClient
+import net.minecraft.client.option.KeyBinding
+import net.minecraft.client.util.InputUtil
+import net.minecraft.text.Text
+import org.lwjgl.glfw.GLFW
+import net.fabricmc.api.EnvType
+import net.fabricmc.api.Environment
+import net.minecraft.client.gui.screen.Screen
+import net.minecraft.client.gui.widget.ButtonWidget
+import net.minecraft.client.util.math.MatrixStack
+
+
+object SciFyClient : ClientModInitializer {
+	override fun onInitializeClient() {
+		
+		val menu = KeyBindingHelper.registerKeyBinding(
+			KeyBinding(
+				"Menu",
+				InputUtil.Type.KEYSYM,
+				GLFW.GLFW_KEY_RIGHT_SHIFT,
+				"SciFy"
+			)
+		)
+		ClientTickEvents.END_CLIENT_TICK.register(ClientTickEvents.EndTick { client: MinecraftClient ->
+			while (menu.wasPressed()) {
+				// Debug
+				client.player!!.sendMessage(Text.literal("Button input received."), true)
+
+			}
+		})
+	}
+}
+
+@Environment(EnvType.CLIENT)
+class ScifyModMenu : ModMenuApi {
+	override fun getModConfigScreenFactory(): ConfigScreenFactory<*> {
+		return ConfigScreenFactory<*> { parent -> Menu(parent) }
+	}
+}
+
+
+@Environment(EnvType.CLIENT)
+class menu(private val parent: Screen) : Screen(Text.literal("Your Mod Config")) {
+	override fun init() {
+		// Add a button to open Mod Menu
+		val modMenuButton = ButtonWidget.builder(
+			Text.literal("Mod Menu")
+		) { button: ButtonWidget? ->
+			// Open Mod Menu
+			ModMenu.getInstance().openConfigScreen()
+		}
+			.dimensions(width / 2 - 100, height / 2, 200, 20)
+			.build()
+
+		addDrawableChild(modMenuButton)
+	}
+
+	override fun render(matrices: MatrixStack, mouseX: Int, mouseY: Int, delta: Float) {
+		renderBackground(matrices)
+		super.render(matrices, mouseX, mouseY, delta)
+	}
+
+	fun onClose() {
+		client!!.setScreen(parent)
+	}
+}

src/client/resources/scify.client.mixins.json

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+{
+	"required": true,
+	"package": "chickenmanfy.scify.mixin.client",
+	"compatibilityLevel": "JAVA_17",
+	"client": [
+		"ExampleClientMixin"
+	],
+	"injectors": {
+		"defaultRequire": 1
+	}
+}