Make export default class the main file class in GDScript, add support for subclasses

parse_node/parse_call_expression.ts

@@ -421,7 +421,7 @@ v1.distance_to(v1)
 
 export const testArrowScoping: Test = {
   ts: `
-export class Foo {
+export default class Foo {
   a() {
     const a = () => {};
   }
@@ -513,7 +513,7 @@ d["b"] = 2
 export const testConnect: Test = {
   expectFail: true,
   ts: `
-export class Test extends Area2D {
+export default class Test extends Area2D {
   constructor() {
     super()
 
@@ -537,7 +537,7 @@ func on_body_entered(_body):
 
 export const testConnect2: Test = {
   ts: `
-export class Test extends Area2D {
+export default class Test extends Area2D {
   constructor() {
     super()
 
@@ -559,7 +559,7 @@ func _ready():
 
 export const testConnectWithClosures: Test = {
   ts: `
-export class Test extends Area2D {
+export default class Test extends Area2D {
   constructor() {
     super()
     let x = 1, y = 2;
@@ -584,7 +584,7 @@ func _ready():
 // we intentionally do not capture `this` as self - see comment in parse_arrow_function.ts for rationale
 export const testConnectWithClosuresNoThis: Test = {
   ts: `
-export class Test extends Area2D {
+export default class Test extends Area2D {
   constructor() {
     super()
     let x = 1, y = 2;
@@ -608,7 +608,7 @@ func _ready():
 
 export const testConnectComplex: Test = {
   ts: `
-export class Test {
+export default class Test {
   enemies: any;
 
   foo() {
@@ -643,7 +643,7 @@ d[[1, 2]] = 2
 
 export const testEmitSignal: Test = {
   ts: `
-export class CityGridCollision extends Area {
+export default class CityGridCollision extends Area {
   $mouseenter!: Signal<[]>;
   test() {
     this.$mouseenter.emit()
@@ -678,7 +678,7 @@ __map(__filter(a, [funcref(self, "__gen"), {}]), [funcref(self, "__gen1"), {}])
 
 export const testRewriteGetNode: Test = {
   ts: `
-export class Test {
+export default class Test {
   foo() {
     this.get_node('hello')
   }
@@ -694,7 +694,7 @@ func foo():
 
 export const testRewriteGetNode2: Test = {
   ts: `
-export class Test {
+export default class Test {
   foo() {
     this.get_node_unsafe('hello')
   }
@@ -733,7 +733,7 @@ export const testFunctionNull: Test = {
     x(): number | null;
   }
 
-  export class Test {
+  export default class Test {
     example() {
       const thing: Foo = new Foo()
       let result = thing.x()
@@ -782,7 +782,7 @@ x.get_node("Foo")
 
 export const testConnectDirectlyToSig: Test = {
   ts: `
-export class Test extends Area2D {
+export default class Test extends Area2D {
   $mysig!: Signal
 
   constructor() {
@@ -807,7 +807,7 @@ func _ready():
 
 export const testNestedDirectSignalConnect: Test = {
   ts: `
-export class Test extends Area2D {
+export default class Test extends Area2D {
   $mysig!: Signal
   test!: Test
 
@@ -839,7 +839,7 @@ func _ready():
 
 export const testRpcRewrite: Test = {
   ts: `
-export class Test extends Area2D {
+export default class Test extends Area2D {
   rpc_me() {
 
   }
@@ -879,7 +879,7 @@ func _ready():
 
 export const testPassInFunction: Test = {
   ts: `
-export class Test extends Area2D {
+export default class Test extends Area2D {
   fn(other: () => void) {
     other()
   }

parse_node/parse_class_declaration.ts

@@ -73,10 +73,10 @@ export const parseClassDeclaration = (
   node: ts.ClassDeclaration | ts.ClassExpression,
   props: ParseState
 ): ParseNodeType => {
-  const modifiers = node.modifiers?.map((x) => x.getText())
+  const modifiers = (node.modifiers ?? []).map((x) => x.getText())
 
   // skip class declarations; there's no code to generate here
-  if (modifiers?.includes("declare")) {
+  if (modifiers.includes("declare")) {
     return combine({
       parent: node,
       nodes: [],
@@ -89,9 +89,13 @@ export const parseClassDeclaration = (
     (dec) => dec.expression.getText() === "autoload"
   )
 
-  if (!modifiers?.includes("export") && !isAutoload) {
+  if (
+    !modifiers.includes("export") &&
+    !modifiers.includes("default") &&
+    isAutoload
+  ) {
     addError({
-      description: "You must export this class.",
+      description: "Only class exported as default can be autoloaded.",
       error: ErrorName.ClassMustBeExported,
       location: node,
       stack: new Error().stack ?? "",
@@ -124,18 +128,68 @@ ${members.join("")}
   })
 }
 
-export const testRequireExportedClass: Test = {
+export const testInnerClassExtends: Test = {
+  ts: `
+export default class Test {
+}
+
+export class InnerTest extends Node2D {
+  field: int = 2;
+}
+  `,
+  expected: `
+class_name Test
+
+class InnerTest extends Node2D:
+  var field: int = 2
+`,
+}
+
+export const testInnerClassExtendsSuperCall: Test = {
+  ts: `
+export default class Test {
+}
+
+export class InnerTest extends Node2D {
+  field: int = 2;
+
+  constructor() {
+    super();
+  }
+}
+  `,
+  expected: `
+class_name Test
+
+class InnerTest extends Node2D:
+  var field: int = 2
+  func _init().():
+    pass
+`,
+}
+
+export const testFileWithoutDefaultClass: Test = {
   ts: `
 class Foo {
   x = 1
+}
+
+export class Foo2 {
+  x = 1
 }`,
-  expected: { error: "You must export this class", type: "error" },
+  expected: `
+class Foo:
+  var x: int = 1  
+
+class Foo2:
+  var x: int = 1 
+`,
 }
 
 export const testDontRequireExportingAutoloads: Test = {
   ts: `
 @autoload
-class Foo {
+export default class Foo {
   x = 1
 }`,
   expected: `
@@ -147,7 +201,7 @@ var x: int = 1
 export const testExportArgsSetGet: Test = {
   ts: `
 @autoload
-class Foo {
+export default class Foo {
   @exports
   get nodes(): PackedScene<Node2D>[] {
       return [];
@@ -166,3 +220,15 @@ func nodes_set(_v):
   pass
 `,
 }
+
+export const testDontRequireDefaultExportingAutoloads: Test = {
+  ts: `
+@autoload
+class Foo {
+  x = 1
+}`,
+  expected: {
+    error: "Only class exported as default can be autoloaded",
+    type: "error",
+  },
+}