added nonnull assertions

build.gradle

@@ -28,6 +28,7 @@ dependencies {
 
 	// PSA: Some older mods, compiled on Loom 0.2.1, might have outdated Maven POMs.
 	// You may need to force-disable transitiveness on them.
+	compileOnly "com.google.code.findbugs:jsr305:${project.jsr305_version}"
 }
 
 processResources {

gradle.properties

@@ -6,6 +6,7 @@ org.gradle.jvmargs=-Xmx1G
     # or better: https://modmuss50.me/fabric.html
 	minecraft_version=23w05a
 	loader_version=0.14.13
+	jsr305_version=3.0.2
 	fabric_version=0.73.3+1.19.4
 
 # Mod Properties

src/main/java/carpet/script/annotation/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.annotation;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/api/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.api;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/argument/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.argument;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/command/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.command;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/exception/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.exception;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/language/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.language;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/utils/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.utils;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/utils/shapes/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.utils.shapes;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;

src/main/java/carpet/script/value/package-info.java

@@ -0,0 +1,8 @@
+@ParametersAreNonnullByDefault
+@FieldsAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+package carpet.script.value;
+
+import net.minecraft.FieldsAreNonnullByDefault;
+import net.minecraft.MethodsReturnNonnullByDefault;
+import javax.annotation.ParametersAreNonnullByDefault;