fix(do-expr): SwitchStatement with IfStatement cases

packages/babel-plugin-proposal-do-expressions/test/fixtures/do-expression-switch-case/condition-before-break/exec.js

@@ -0,0 +1,10 @@
+const x = (n) => do {
+  switch (n) {
+    case 0:
+      if (true) {
+        break;
+      }
+   }
+}
+
+expect(x(0)).toBe(undefined);

packages/babel-plugin-proposal-do-expressions/test/fixtures/do-expression-switch-case/condition-before-break/input.js

@@ -0,0 +1,8 @@
+const x = (n) => do {
+  switch (n) {
+    case 0:
+      if (true) {
+        break;
+      }
+   }
+}

packages/babel-plugin-proposal-do-expressions/test/fixtures/do-expression-switch-case/condition-before-break/output.js

@@ -0,0 +1,6 @@
+const x = n => function () {
+  switch (n) {
+    case 0:
+      if (true) return void 0;
+  }
+}();

packages/babel-plugin-proposal-do-expressions/test/fixtures/do-expression-switch-case/condition-before-expression/input.js

@@ -0,0 +1,10 @@
+const x = (n) => do {
+  switch (n) {
+    case 0:
+      if (true) {
+        'out';
+        break;
+      }
+
+   }
+}

packages/babel-plugin-proposal-do-expressions/test/fixtures/do-expression-switch-case/condition-before-expression/output.js

@@ -0,0 +1,9 @@
+const x = n => function () {
+  switch (n) {
+    case 0:
+      if (true) {
+        return 'out';
+      }
+
+  }
+}();

packages/babel-traverse/src/path/family.js

@@ -18,27 +18,48 @@ function addCompletionRecords(path, paths) {
   return paths;
 }
 
+function findBreak(statements): ?NodePath {
+  let breakStatement;
+  if (!Array.isArray(statements)) {
+    statements = [statements];
+  }
+
+  for (const statement of statements) {
+    if (
+      statement.isDoExpression() ||
+      statement.isProgram() ||
+      statement.isBlockStatement() ||
+      statement.isCatchClause() ||
+      statement.isLabeledStatement()
+    ) {
+      breakStatement = findBreak(statement.get("body"));
+    } else if (statement.isIfStatement()) {
+      breakStatement =
+        findBreak(statement.get("consequent")) ??
+        findBreak(statement.get("alternate"));
+    } else if (statement.isTryStatement()) {
+      breakStatement =
+        findBreak(statement.get("block")) ??
+        findBreak(statement.get("handler"));
+    } else if (statement.isBreakStatement()) {
+      breakStatement = statement;
+    }
+
+    if (breakStatement) {
+      return breakStatement;
+    }
+  }
+  return null;
+}
+
 function completionRecordForSwitch(cases, paths) {
   let isLastCaseWithConsequent = true;
 
   for (let i = cases.length - 1; i >= 0; i--) {
     const switchCase = cases[i];
     const consequent = switchCase.get("consequent");
 
-    let breakStatement;
-    findBreak: for (const statement of consequent) {
-      if (statement.isBlockStatement()) {
-        for (const statementInBlock of statement.get("body")) {
-          if (statementInBlock.isBreakStatement()) {
-            breakStatement = statementInBlock;
-            break findBreak;
-          }
-        }
-      } else if (statement.isBreakStatement()) {
-        breakStatement = statement;
-        break;
-      }
-    }
+    let breakStatement = findBreak(consequent);
 
     if (breakStatement) {
       while (