Add support for class static initialization blocks (#1451)

Perryvw · web-flow · commit a2ee2f7754d1 · 2023-06-04T17:40:19.000+02:00
* Tests for new decorators

* Rename old decorate function to DecorateLegacy

* Method decorators and partially accessor decorators rewritten

* Modern decorators except field decorators working but with some regression to legacy

* All decorators legacy and modern work, except for field decorators

* Finalize property decorators

* Fix unit tests

* Add support for class static initialization blocks
diff --git a/src/transformation/visitors/class/index.ts b/src/transformation/visitors/class/index.ts
@@ -186,6 +186,15 @@ function transformClassLikeDeclaration(
                     lua.createExpressionStatement(createClassPropertyDecoratingExpression(context, member, className))
                 );
             }
+        } else if (ts.isClassStaticBlockDeclaration(member)) {
+            if (member.body.statements.length > 0) {
+                const bodyStatements = context.transformStatements(member.body.statements);
+                const iif = lua.createFunctionExpression(lua.createBlock(bodyStatements), [
+                    lua.createIdentifier("self"),
+                ]);
+                const iife = lua.createCallExpression(iif, [className]);
+                result.push(lua.createExpressionStatement(iife, member));
+            }
         }
     }
 
diff --git a/test/unit/classes/classes.spec.ts b/test/unit/classes/classes.spec.ts
@@ -799,3 +799,22 @@ test.each(['(this["bar"])', '((((this["bar"]))))'])("methods in parentheses pass
         export const result = inst.foo();
     `.expectToMatchJsResult();
 });
+
+// https://github.com/TypeScriptToLua/TypeScriptToLua/issues/1447
+test("static initialization block (#1447)", () => {
+    util.testModule`
+        class A {
+            private static staticProperty1 = 3;
+            public static staticProperty2;
+            static {
+                this.staticProperty2 = this.staticProperty1 + 5;
+            }
+            public static staticProperty3;
+            static {
+                this.staticProperty3 = this.staticProperty1 + this.staticProperty2;
+            }
+        }
+        export const result1 = A.staticProperty2;
+        export const result2 = A.staticProperty3;
+    `.expectToMatchJsResult();
+});

Original file line number	Diff line number	Diff line change
`@@ -186,6 +186,15 @@ function transformClassLikeDeclaration(`
`186`	`186`	`lua.createExpressionStatement(createClassPropertyDecoratingExpression(context, member, className))`
`187`	`187`	`);`
`188`	`188`	`}`
	`189`	`+ } else if (ts.isClassStaticBlockDeclaration(member)) {`
	`190`	`+ if (member.body.statements.length > 0) {`
	`191`	`+ const bodyStatements = context.transformStatements(member.body.statements);`
	`192`	`+ const iif = lua.createFunctionExpression(lua.createBlock(bodyStatements), [`
	`193`	`+ lua.createIdentifier("self"),`
	`194`	`+ ]);`
	`195`	`+ const iife = lua.createCallExpression(iif, [className]);`
	`196`	`+ result.push(lua.createExpressionStatement(iife, member));`
	`197`	`+ }`
`189`	`198`	`}`
`190`	`199`	`}`
`191`	`200`