Parse class static block (#12079)

Co-authored-by: Brian Ng <bng412@gmail.com>

packages/babel-generator/src/generators/classes.js

@@ -134,3 +134,18 @@ export function _classMethodHead(node) {
   this.tsPrintClassMemberModifiers(node, /* isField */ false);
   this._methodHead(node);
 }
+
+export function StaticBlock(node) {
+  this.word("static");
+  this.space();
+  this.token("{");
+  if (node.body.length === 0) {
+    this.token("}");
+  } else {
+    this.newline();
+    this.printSequence(node.body, node, {
+      indent: true,
+    });
+    this.rightBrace();
+  }
+}

packages/babel-generator/test/fixtures/minified/static-block/input.js

@@ -0,0 +1,16 @@
+class Foo {
+  static {}
+}
+
+class A1 {
+  static{
+    foo;
+  }
+}
+
+class A2 {
+  static {
+    foo;
+    bar;
+  }
+}

packages/babel-generator/test/fixtures/minified/static-block/options.json

@@ -0,0 +1,4 @@
+{
+  "minified": true,
+  "plugins": ["classStaticBlock"]
+}

packages/babel-generator/test/fixtures/minified/static-block/output.js

@@ -0,0 +1 @@
+class Foo{static{}}class A1{static{foo}}class A2{static{foo;bar}}

packages/babel-generator/test/fixtures/types/ClassBody-StaticBlock/input.js

@@ -0,0 +1,15 @@
+class Foo {
+  static {}
+}
+
+class A1 {
+  static{
+    foo;
+  }
+}
+
+class A2 {
+  static {
+    foo;bar;
+  }
+}

packages/babel-generator/test/fixtures/types/ClassBody-StaticBlock/options.json

@@ -0,0 +1 @@
+{ "plugins": ["classStaticBlock"] }

packages/babel-generator/test/fixtures/types/ClassBody-StaticBlock/output.js

@@ -0,0 +1,16 @@
+class Foo {
+  static {}
+}
+
+class A1 {
+  static {
+    foo;
+  }
+}
+
+class A2 {
+  static {
+    foo;
+    bar;
+  }
+}