diff --git a/packages/babel-generator/test/fixtures/edgecase/single-arg-async-arrow-with-retainlines/input.js b/packages/babel-generator/test/fixtures/edgecase/single-arg-async-arrow-with-retainlines/input.js
index e409b79f57..b5a205cc36 100644
--- a/packages/babel-generator/test/fixtures/edgecase/single-arg-async-arrow-with-retainlines/input.js
+++ b/packages/babel-generator/test/fixtures/edgecase/single-arg-async-arrow-with-retainlines/input.js
@@ -2,8 +2,8 @@ var fn = async (
     arg
 ) => {}
 
-async (x)
-=> {}
+async (x) =>
+{}
 
 async x => {}
 
diff --git a/packages/babel-parser/src/parser/expression.js b/packages/babel-parser/src/parser/expression.js
index b9195c3a97..1483f90612 100644
--- a/packages/babel-parser/src/parser/expression.js
+++ b/packages/babel-parser/src/parser/expression.js
@@ -524,12 +524,21 @@ export default class ExpressionParser extends LValParser {
     startLoc: Position,
     noCalls?: ?boolean,
   ): N.Expression {
+    const maybeAsyncArrow = this.atPossibleAsync(base);
+
     const state = {
       optionalChainMember: false,
       stop: false,
     };
     do {
-      base = this.parseSubscript(base, startPos, startLoc, noCalls, state);
+      base = this.parseSubscript(
+        base,
+        startPos,
+        startLoc,
+        noCalls,
+        state,
+        maybeAsyncArrow,
+      );
     } while (!state.stop);
     return base;
   }
@@ -544,6 +553,7 @@ export default class ExpressionParser extends LValParser {
     startLoc: Position,
     noCalls: ?boolean,
     state: N.ParseSubscriptState,
+    maybeAsyncArrow: boolean,
   ): N.Expression {
     if (!noCalls && this.eat(tt.doubleColon)) {
       const node = this.startNodeAt(startPos, startLoc);
@@ -575,13 +585,8 @@ export default class ExpressionParser extends LValParser {
         this.expect(tt.bracketR);
         return this.finishNode(node, "OptionalMemberExpression");
       } else if (this.eat(tt.parenL)) {
-        const possibleAsync = this.atPossibleAsync(base);
-
         node.callee = base;
-        node.arguments = this.parseCallExpressionArguments(
-          tt.parenR,
-          possibleAsync,
-        );
+        node.arguments = this.parseCallExpressionArguments(tt.parenR, false);
         node.optional = true;
         return this.finishNode(node, "OptionalCallExpression");
       } else {
@@ -620,7 +625,6 @@ export default class ExpressionParser extends LValParser {
       this.state.yieldPos = 0;
       this.state.awaitPos = 0;
 
-      const possibleAsync = this.atPossibleAsync(base);
       this.next();
 
       let node = this.startNodeAt(startPos, startLoc);
@@ -631,7 +635,7 @@ export default class ExpressionParser extends LValParser {
 
       node.arguments = this.parseCallExpressionArguments(
         tt.parenR,
-        possibleAsync,
+        maybeAsyncArrow,
         base.type === "Import",
         base.type !== "Super",
       );
@@ -641,7 +645,7 @@ export default class ExpressionParser extends LValParser {
         this.finishOptionalCallExpression(node);
       }
 
-      if (possibleAsync && this.shouldParseAsyncArrow()) {
+      if (maybeAsyncArrow && this.shouldParseAsyncArrow()) {
         state.stop = true;
 
         this.checkCommaAfterRestFromSpread();
@@ -704,11 +708,11 @@ export default class ExpressionParser extends LValParser {
 
   atPossibleAsync(base: N.Expression): boolean {
     return (
-      !this.state.containsEsc &&
-      this.state.potentialArrowAt === base.start &&
       base.type === "Identifier" &&
       base.name === "async" &&
-      !this.canInsertSemicolon()
+      this.state.lastTokEnd === base.end &&
+      !this.canInsertSemicolon() &&
+      this.state.input.slice(base.start, base.end) === "async"
     );
   }
 
@@ -791,7 +795,7 @@ export default class ExpressionParser extends LValParser {
   }
 
   shouldParseAsyncArrow(): boolean {
-    return this.match(tt.arrow);
+    return this.match(tt.arrow) && !this.canInsertSemicolon();
   }
 
   parseAsyncArrowFromCallExpression(
@@ -891,6 +895,7 @@ export default class ExpressionParser extends LValParser {
           return this.parseFunction(node, undefined, true);
         } else if (
           canBeArrow &&
+          !containsEsc &&
           id.name === "async" &&
           this.match(tt.name) &&
           !this.canInsertSemicolon()
diff --git a/packages/babel-parser/src/parser/statement.js b/packages/babel-parser/src/parser/statement.js
index 47b3c9f2c7..d97d4986a0 100644
--- a/packages/babel-parser/src/parser/statement.js
+++ b/packages/babel-parser/src/parser/statement.js
@@ -1321,6 +1321,7 @@ export default class StatementParser extends ExpressionParser {
       return;
     }
 
+    const containsEsc = this.state.containsEsc;
     const key = this.parseClassPropertyName(member);
     const isPrivate = key.type === "PrivateName";
     // Check the key is not a computed expression or string literal.
@@ -1371,7 +1372,12 @@ export default class StatementParser extends ExpressionParser {
       } else {
         this.pushClassProperty(classBody, publicProp);
       }
-    } else if (isSimple && key.name === "async" && !this.isLineTerminator()) {
+    } else if (
+      isSimple &&
+      key.name === "async" &&
+      !containsEsc &&
+      !this.isLineTerminator()
+    ) {
       // an async method
       const isGenerator = this.eat(tt.star);
 
@@ -1407,6 +1413,7 @@ export default class StatementParser extends ExpressionParser {
     } else if (
       isSimple &&
       (key.name === "get" || key.name === "set") &&
+      !containsEsc &&
       !(this.match(tt.star) && this.isLineTerminator())
     ) {
       // `get\n*` is an uninitialized property named 'get' followed by a generator.
diff --git a/packages/babel-parser/src/plugins/flow.js b/packages/babel-parser/src/plugins/flow.js
index 80961e0938..725eea4957 100644
--- a/packages/babel-parser/src/plugins/flow.js
+++ b/packages/babel-parser/src/plugins/flow.js
@@ -2619,6 +2619,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       startLoc: Position,
       noCalls: ?boolean,
       subscriptState: N.ParseSubscriptState,
+      maybeAsyncArrow: boolean,
     ): N.Expression {
       if (this.match(tt.questionDot) && this.isLookaheadRelational("<")) {
         this.expectPlugin("optionalChaining");
@@ -2671,6 +2672,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         startLoc,
         noCalls,
         subscriptState,
+        maybeAsyncArrow,
       );
     }
 
diff --git a/packages/babel-parser/src/plugins/typescript.js b/packages/babel-parser/src/plugins/typescript.js
index 7d1f81d1b8..0724db5570 100644
--- a/packages/babel-parser/src/plugins/typescript.js
+++ b/packages/babel-parser/src/plugins/typescript.js
@@ -1498,6 +1498,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       startLoc: Position,
       noCalls: ?boolean,
       state: N.ParseSubscriptState,
+      maybeAsyncArrow: boolean,
     ): N.Expression {
       if (!this.hasPrecedingLineBreak() && this.match(tt.bang)) {
         this.state.exprAllowed = false;
@@ -1560,7 +1561,14 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         if (result) return result;
       }
 
-      return super.parseSubscript(base, startPos, startLoc, noCalls, state);
+      return super.parseSubscript(
+        base,
+        startPos,
+        startLoc,
+        noCalls,
+        state,
+        maybeAsyncArrow,
+      );
     }
 
     parseNewArguments(node: N.NewExpression): void {
diff --git a/packages/babel-parser/test/fixtures/core/object/invalid-escape-get/input.js b/packages/babel-parser/test/fixtures/core/object/invalid-escape-get/input.js
new file mode 100644
index 0000000000..208cd4d559
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/core/object/invalid-escape-get/input.js
@@ -0,0 +1 @@
+({ ge\u0074 x() {} })
diff --git a/packages/babel-parser/test/fixtures/core/object/invalid-escape-get/options.json b/packages/babel-parser/test/fixtures/core/object/invalid-escape-get/options.json
new file mode 100644
index 0000000000..0cd8225707
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/core/object/invalid-escape-get/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \",\" (1:12)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/core/valid-escape/async/input.js b/packages/babel-parser/test/fixtures/core/valid-escape/async/input.js
new file mode 100644
index 0000000000..2e12a7c8d0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/core/valid-escape/async/input.js
@@ -0,0 +1 @@
+(\u0061sync ())
diff --git a/packages/babel-parser/test/fixtures/core/valid-escape/async/output.json b/packages/babel-parser/test/fixtures/core/valid-escape/async/output.json
new file mode 100644
index 0000000000..e220d3207f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/core/valid-escape/async/output.json
@@ -0,0 +1,87 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 15,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 15
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 15,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 15
+      }
+    },
+    "sourceType": "script",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 15,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 15
+          }
+        },
+        "expression": {
+          "type": "CallExpression",
+          "start": 1,
+          "end": 14,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 1
+            },
+            "end": {
+              "line": 1,
+              "column": 14
+            }
+          },
+          "callee": {
+            "type": "Identifier",
+            "start": 1,
+            "end": 11,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 11
+              },
+              "identifierName": "async"
+            },
+            "name": "async"
+          },
+          "arguments": [],
+          "extra": {
+            "parenthesized": true,
+            "parenStart": 0
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-get/input.js b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-get/input.js
new file mode 100644
index 0000000000..dca801f8de
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-get/input.js
@@ -0,0 +1 @@
+class X { ge\u0074 x() {} }
diff --git a/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-get/options.json b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-get/options.json
new file mode 100644
index 0000000000..1e730e1707
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-get/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token (1:19)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-set/input.js b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-set/input.js
new file mode 100644
index 0000000000..fafbe9ab9f
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-set/input.js
@@ -0,0 +1 @@
+class X { se\u0074 x(value) {} }
diff --git a/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-set/options.json b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-set/options.json
new file mode 100644
index 0000000000..1e730e1707
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-set/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token (1:19)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-static/input.js b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-static/input.js
new file mode 100644
index 0000000000..a561f8c321
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-static/input.js
@@ -0,0 +1 @@
+class X { st\u0061tic y() {} }
diff --git a/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-static/options.json b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-static/options.json
new file mode 100644
index 0000000000..b23f881870
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/class/invalid-escape-static/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token (1:22)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/for-of/invalid-escape-of/input.js b/packages/babel-parser/test/fixtures/es2015/for-of/invalid-escape-of/input.js
new file mode 100644
index 0000000000..7d84031832
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/for-of/invalid-escape-of/input.js
@@ -0,0 +1 @@
+for (x \u006ff y) {}
diff --git a/packages/babel-parser/test/fixtures/es2015/for-of/invalid-escape-of/options.json b/packages/babel-parser/test/fixtures/es2015/for-of/invalid-escape-of/options.json
new file mode 100644
index 0000000000..6b9933a771
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/for-of/invalid-escape-of/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \";\" (1:7)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/generators/invalid-escape-yield/input.js b/packages/babel-parser/test/fixtures/es2015/generators/invalid-escape-yield/input.js
new file mode 100644
index 0000000000..521b91facb
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/generators/invalid-escape-yield/input.js
@@ -0,0 +1 @@
+(function* () { y\u0069eld 10 })
diff --git a/packages/babel-parser/test/fixtures/es2015/generators/invalid-escape-yield/options.json b/packages/babel-parser/test/fixtures/es2015/generators/invalid-escape-yield/options.json
new file mode 100644
index 0000000000..dcd45c9b97
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/generators/invalid-escape-yield/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Can not use 'yield' as identifier inside a generator (1:16)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/let/invalid-escape/input.js b/packages/babel-parser/test/fixtures/es2015/let/invalid-escape/input.js
new file mode 100644
index 0000000000..b5cc585a2a
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/let/invalid-escape/input.js
@@ -0,0 +1 @@
+le\u0074 x = 5
diff --git a/packages/babel-parser/test/fixtures/es2015/let/invalid-escape/options.json b/packages/babel-parser/test/fixtures/es2015/let/invalid-escape/options.json
new file mode 100644
index 0000000000..410ecd16fd
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/let/invalid-escape/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \";\" (1:9)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/meta-properties/new-target-invalid-escaped-target/input.js b/packages/babel-parser/test/fixtures/es2015/meta-properties/new-target-invalid-escaped-target/input.js
new file mode 100644
index 0000000000..70a512c677
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/meta-properties/new-target-invalid-escaped-target/input.js
@@ -0,0 +1 @@
+function f() { new.ta\u0072get; }
diff --git a/packages/babel-parser/test/fixtures/es2015/meta-properties/new-target-invalid-escaped-target/options.json b/packages/babel-parser/test/fixtures/es2015/meta-properties/new-target-invalid-escaped-target/options.json
new file mode 100644
index 0000000000..4f4b2be4c1
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/meta-properties/new-target-invalid-escaped-target/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "The only valid meta property for new is new.target (1:19)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-export-as/input.js b/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-export-as/input.js
new file mode 100644
index 0000000000..bce2030589
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-export-as/input.js
@@ -0,0 +1 @@
+export { X \u0061s Y }
diff --git a/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-export-as/options.json b/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-export-as/options.json
new file mode 100644
index 0000000000..16c061d4df
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-export-as/options.json
@@ -0,0 +1,4 @@
+{
+  "sourceType": "module",
+  "throws": "Unexpected token, expected \",\" (1:11)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-import-from/input.js b/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-import-from/input.js
new file mode 100644
index 0000000000..3f4408ab6e
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-import-from/input.js
@@ -0,0 +1 @@
+import X fro\u006d 'x'
diff --git a/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-import-from/options.json b/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-import-from/options.json
new file mode 100644
index 0000000000..6dab969b11
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2015/modules/invalid-escape-import-from/options.json
@@ -0,0 +1,4 @@
+{
+  "sourceType": "module",
+  "throws": "Unexpected token (1:9)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-class-method/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-class-method/input.js
new file mode 100644
index 0000000000..4dd0cd76e3
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-class-method/input.js
@@ -0,0 +1 @@
+class X { \u0061sync x() { await x } }
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-class-method/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-class-method/options.json
new file mode 100644
index 0000000000..b81bee7fa2
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-class-method/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token (1:21)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-obj-method/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-obj-method/input.js
new file mode 100644
index 0000000000..0807ff1251
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-obj-method/input.js
@@ -0,0 +1 @@
+({ \u0061sync x() { await x } })
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-obj-method/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-obj-method/options.json
new file mode 100644
index 0000000000..f0907a4484
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-obj-method/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \",\" (1:14)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-static-class-method/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-static-class-method/input.js
new file mode 100644
index 0000000000..a5b20dfebc
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-static-class-method/input.js
@@ -0,0 +1 @@
+class X { static \u0061sync x() { await x } }
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-static-class-method/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-static-class-method/options.json
new file mode 100644
index 0000000000..f55830c1c3
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-async-static-class-method/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token (1:28)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-await/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-await/input.js
new file mode 100644
index 0000000000..824b1c3772
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-await/input.js
@@ -0,0 +1 @@
+(async function() { aw\u0061it x })
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-await/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-await/options.json
new file mode 100644
index 0000000000..ac6c5914ce
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-await/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Can not use 'await' as identifier inside an async function (1:20)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-async-function/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-async-function/input.js
new file mode 100644
index 0000000000..0d2ad1b323
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-async-function/input.js
@@ -0,0 +1 @@
+export \u0061sync function y() { await x }
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-async-function/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-async-function/options.json
new file mode 100644
index 0000000000..9d60866b80
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-async-function/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \"{\" (1:7)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-dflt-async-function/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-dflt-async-function/input.js
new file mode 100644
index 0000000000..d14f4188a0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-dflt-async-function/input.js
@@ -0,0 +1 @@
+export default \u0061sync function y() { await x }
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-dflt-async-function/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-dflt-async-function/options.json
new file mode 100644
index 0000000000..b0e5516212
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-dflt-async-function/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \";\" (1:26)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow-list/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow-list/input.js
new file mode 100644
index 0000000000..55506a8872
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow-list/input.js
@@ -0,0 +1 @@
+(\u0061sync x => { await x })
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow-list/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow-list/options.json
new file mode 100644
index 0000000000..0cd8225707
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow-list/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \",\" (1:12)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow/input.js
new file mode 100644
index 0000000000..1989072f30
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow/input.js
@@ -0,0 +1 @@
+\u0061sync x => { await x }
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow/options.json
new file mode 100644
index 0000000000..f6eb197b1d
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \";\" (1:11)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function-list/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function-list/input.js
new file mode 100644
index 0000000000..9786373930
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function-list/input.js
@@ -0,0 +1 @@
+(\u0061sync function() { await x })
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function-list/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function-list/options.json
new file mode 100644
index 0000000000..0cd8225707
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function-list/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \",\" (1:12)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function/input.js
new file mode 100644
index 0000000000..a44cfbb62d
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function/input.js
@@ -0,0 +1 @@
+\u0061sync function() { await x }
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function/options.json
new file mode 100644
index 0000000000..f6eb197b1d
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-function/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \";\" (1:11)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-newline-after-params/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-newline-after-params/input.js
new file mode 100644
index 0000000000..52a0795cf0
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-newline-after-params/input.js
@@ -0,0 +1,2 @@
+async (x)
+=> {}
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-newline-after-params/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-newline-after-params/options.json
new file mode 100644
index 0000000000..0361d7c7d2
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-newline-after-params/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token (2:0)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-arrow/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-arrow/input.js
new file mode 100644
index 0000000000..33dbaaa09e
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-arrow/input.js
@@ -0,0 +1 @@
+(async)(a) => {}
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-arrow/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-arrow/options.json
new file mode 100644
index 0000000000..f6eb197b1d
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-arrow/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \";\" (1:11)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-func/input.js b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-func/input.js
new file mode 100644
index 0000000000..0af564cef7
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-func/input.js
@@ -0,0 +1 @@
+(async) function x (a) {}
diff --git a/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-func/options.json b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-func/options.json
new file mode 100644
index 0000000000..c2fcdb08cf
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2017/async-functions/invalid-parens-async-func/options.json
@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \";\" (1:8)"
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/flow/regression/arrow-function-with-newline/input.js b/packages/babel-parser/test/fixtures/flow/regression/arrow-function-with-newline/input.js
new file mode 100644
index 0000000000..5868c4e2fe
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/regression/arrow-function-with-newline/input.js
@@ -0,0 +1,2 @@
+async (f)
+: t => { }
diff --git a/packages/babel-parser/test/fixtures/flow/regression/arrow-function-with-newline/output.json b/packages/babel-parser/test/fixtures/flow/regression/arrow-function-with-newline/output.json
new file mode 100644
index 0000000000..acc286d064
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/flow/regression/arrow-function-with-newline/output.json
@@ -0,0 +1,152 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 20,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 2,
+      "column": 10
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 20,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 2,
+        "column": 10
+      }
+    },
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 20,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 2,
+            "column": 10
+          }
+        },
+        "expression": {
+          "type": "ArrowFunctionExpression",
+          "start": 0,
+          "end": 20,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 2,
+              "column": 10
+            }
+          },
+          "returnType": {
+            "type": "TypeAnnotation",
+            "start": 10,
+            "end": 13,
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 0
+              },
+              "end": {
+                "line": 2,
+                "column": 3
+              }
+            },
+            "typeAnnotation": {
+              "type": "GenericTypeAnnotation",
+              "start": 12,
+              "end": 13,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 3
+                }
+              },
+              "typeParameters": null,
+              "id": {
+                "type": "Identifier",
+                "start": 12,
+                "end": 13,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 3
+                  },
+                  "identifierName": "t"
+                },
+                "name": "t"
+              }
+            }
+          },
+          "id": null,
+          "generator": false,
+          "async": true,
+          "params": [
+            {
+              "type": "Identifier",
+              "start": 7,
+              "end": 8,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 7
+                },
+                "end": {
+                  "line": 1,
+                  "column": 8
+                },
+                "identifierName": "f"
+              },
+              "name": "f"
+            }
+          ],
+          "body": {
+            "type": "BlockStatement",
+            "start": 17,
+            "end": 20,
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 7
+              },
+              "end": {
+                "line": 2,
+                "column": 10
+              }
+            },
+            "body": [],
+            "directives": []
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babel-parser/test/fixtures/typescript/arrow-function/arrow-function-with-newline/input.js b/packages/babel-parser/test/fixtures/typescript/arrow-function/arrow-function-with-newline/input.js
new file mode 100644
index 0000000000..5868c4e2fe
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/arrow-function/arrow-function-with-newline/input.js
@@ -0,0 +1,2 @@
+async (f)
+: t => { }
diff --git a/packages/babel-parser/test/fixtures/typescript/arrow-function/arrow-function-with-newline/output.json b/packages/babel-parser/test/fixtures/typescript/arrow-function/arrow-function-with-newline/output.json
new file mode 100644
index 0000000000..01a056dd18
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/typescript/arrow-function/arrow-function-with-newline/output.json
@@ -0,0 +1,151 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 20,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 2,
+      "column": 10
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 20,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 2,
+        "column": 10
+      }
+    },
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExpressionStatement",
+        "start": 0,
+        "end": 20,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 2,
+            "column": 10
+          }
+        },
+        "expression": {
+          "type": "ArrowFunctionExpression",
+          "start": 0,
+          "end": 20,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0
+            },
+            "end": {
+              "line": 2,
+              "column": 10
+            }
+          },
+          "returnType": {
+            "type": "TSTypeAnnotation",
+            "start": 10,
+            "end": 13,
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 0
+              },
+              "end": {
+                "line": 2,
+                "column": 3
+              }
+            },
+            "typeAnnotation": {
+              "type": "TSTypeReference",
+              "start": 12,
+              "end": 13,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2
+                },
+                "end": {
+                  "line": 2,
+                  "column": 3
+                }
+              },
+              "typeName": {
+                "type": "Identifier",
+                "start": 12,
+                "end": 13,
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 3
+                  },
+                  "identifierName": "t"
+                },
+                "name": "t"
+              }
+            }
+          },
+          "id": null,
+          "generator": false,
+          "async": true,
+          "params": [
+            {
+              "type": "Identifier",
+              "start": 7,
+              "end": 8,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 7
+                },
+                "end": {
+                  "line": 1,
+                  "column": 8
+                },
+                "identifierName": "f"
+              },
+              "name": "f"
+            }
+          ],
+          "body": {
+            "type": "BlockStatement",
+            "start": 17,
+            "end": 20,
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 7
+              },
+              "end": {
+                "line": 2,
+                "column": 10
+              }
+            },
+            "body": [],
+            "directives": []
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/scripts/tests/test262/test262_whitelist.txt b/scripts/tests/test262/test262_whitelist.txt
index 03e75b2222..b936b9a595 100644
--- a/scripts/tests/test262/test262_whitelist.txt
+++ b/scripts/tests/test262/test262_whitelist.txt
@@ -601,10 +601,6 @@ language/module-code/privatename-not-valid-earlyerr-module-3.js(default)
 language/module-code/privatename-not-valid-earlyerr-module-3.js(strict mode)
 language/module-code/privatename-not-valid-earlyerr-module-4.js(default)
 language/module-code/privatename-not-valid-earlyerr-module-4.js(strict mode)
-language/statements/class/async-gen-meth-escaped-async.js(default)
-language/statements/class/async-gen-meth-escaped-async.js(strict mode)
-language/statements/class/async-meth-escaped-async.js(default)
-language/statements/class/async-meth-escaped-async.js(strict mode)
 language/statements/class/elements/fields-duplicate-privatenames.js(default)
 language/statements/class/elements/fields-duplicate-privatenames.js(strict mode)
 language/statements/class/elements/fields-literal-name-static-propname-constructor.js(default)