Support async do expressions proposal (#10813)

* Support async-do-expression proposal

* Add more tests

* Add changelog

tests/format/js/async-do-expressions/__snapshots__/jsfmt.spec.js.snap

@@ -0,0 +1,87 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`async-do-expressions.js [espree] format 1`] = `
+"Unexpected token do (1:7)
+> 1 | async do {
+    |       ^
+  2 |   1;
+  3 | };
+  4 |"
+`;
+
+exports[`async-do-expressions.js [meriyah] format 1`] = `
+"[1:8]: Unexpected token: 'do' (1:8)
+> 1 | async do {
+    |        ^
+  2 |   1;
+  3 | };
+  4 |"
+`;
+
+exports[`async-do-expressions.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+async do {
+  1;
+};
+
+(async do {});
+
+let x = async do {
+  if (foo()) { f() }
+  else if (bar()) { g() }
+  else { h() }
+};
+
+async do {
+  await 42
+}
+
+function iter() {
+  return async do {
+    return 1;
+  }
+};
+
+let x = async do {
+  let tmp = f();
+  tmp * tmp + 1
+};
+
+=====================================output=====================================
+(async do {
+  1;
+});
+
+(async do {});
+
+let x = async do {
+  if (foo()) {
+    f();
+  } else if (bar()) {
+    g();
+  } else {
+    h();
+  }
+};
+
+(async do {
+  await 42;
+});
+
+function iter() {
+  return async do {
+    return 1;
+  };
+}
+
+let x = async do {
+  let tmp = f();
+  tmp * tmp + 1;
+};
+
+================================================================================
+`;

tests/format/js/async-do-expressions/async-do-expressions.js

@@ -0,0 +1,26 @@
+async do {
+  1;
+};
+
+(async do {});
+
+let x = async do {
+  if (foo()) { f() }
+  else if (bar()) { g() }
+  else { h() }
+};
+
+async do {
+  await 42
+}
+
+function iter() {
+  return async do {
+    return 1;
+  }
+};
+
+let x = async do {
+  let tmp = f();
+  tmp * tmp + 1
+};

tests/format/js/async-do-expressions/jsfmt.spec.js

@@ -0,0 +1 @@
+run_spec(__dirname, ["babel"], { errors: { espree: true, meriyah: true } });

tests/format/js/babel-plugins/__snapshots__/jsfmt.spec.js.snap

@@ -1,5 +1,35 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`async-do-expressions.js [espree] format 1`] = `
+"Unexpected token do (1:7)
+> 1 | async do { await requestAPI().json() };
+    |       ^
+  2 |"
+`;
+
+exports[`async-do-expressions.js [meriyah] format 1`] = `
+"[1:8]: Unexpected token: 'do' (1:8)
+> 1 | async do { await requestAPI().json() };
+    |        ^
+  2 |"
+`;
+
+exports[`async-do-expressions.js format 1`] = `
+====================================options=====================================
+parsers: ["babel", "babel-ts", "babel-flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+async do { await requestAPI().json() };
+
+=====================================output=====================================
+(async do {
+  await requestAPI().json();
+});
+
+================================================================================
+`;
+
 exports[`async-generators.js format 1`] = `
 ====================================options=====================================
 parsers: ["babel", "babel-ts", "babel-flow"]

tests/format/js/babel-plugins/async-do-expressions.js

@@ -0,0 +1 @@
+async do { await requestAPI().json() };

tests/format/js/babel-plugins/jsfmt.spec.js

@@ -28,6 +28,7 @@ run_spec(__dirname, ["babel", "babel-ts", "babel-flow"], {
       "module-string-names.js",
       "class-static-block.js",
       "module-blocks.js",
+      "async-do-expressions.js",
     ],
     meriyah: [
       "decimal.js",
@@ -52,6 +53,7 @@ run_spec(__dirname, ["babel", "babel-ts", "babel-flow"], {
       "import-assertions-static.js",
       "module-string-names.js",
       "module-blocks.js",
+      "async-do-expressions.js",
     ],
   },
 });