diff --git a/estree/estree-tests.ts b/estree/estree-tests.ts
index be9587f3c9..ebfb4efe57 100644
--- a/estree/estree-tests.ts
+++ b/estree/estree-tests.ts
@@ -84,6 +84,7 @@ declare var exportNamedDeclaration: ESTree.ExportNamedDeclaration;
 declare var exportSpecifier: ESTree.ExportSpecifier;
 declare var exportDefaultDeclaration: ESTree.ExportDefaultDeclaration;
 declare var exportAllDeclaration: ESTree.ExportAllDeclaration;
+declare var awaitExpression: ESTree.AwaitExpression;
 
 declare var toplevelStatement: ESTree.Statement | ESTree.ModuleDeclaration;
 declare var expressionOrPattern: ESTree.Expression | ESTree.Pattern;
@@ -181,6 +182,7 @@ pattern = assignmentPattern.left;
 expression = assignmentPattern.right;
 blockStatement = functionExpression.body;
 var booleanMaybe: boolean | undefined = functionExpression.generator;
+booleanMaybe = functionExpression.async;
 
 // SequenceExpression
 var sequenceExpression: ESTree.SequenceExpression;
@@ -224,6 +226,7 @@ identifier = functionDeclaration.id;
 var params: Array<ESTree.Pattern> = functionDeclaration.params;
 blockStatement = functionDeclaration.body;
 booleanMaybe = functionDeclaration.generator;
+booleanMaybe = functionDeclaration.async;
 
 var variableDeclaration: ESTree.VariableDeclaration;
 var declarations: Array<ESTree.VariableDeclarator> = variableDeclaration.declarations;
@@ -253,6 +256,9 @@ string = identifier.name;
 string = literal.type;
 any = literal.value;
 
+// Await Expression
+var awaitExpression: ESTree.AwaitExpression;
+expression = awaitExpression.argument;
 
 // Test narrowing
 
@@ -417,6 +423,9 @@ switch (node.type) {
   case 'Identifier':
     identifier = node;
     break;
+  case 'AwaitExpression':
+    awaitExpression = node;
+    break;
   // end narrowing of Expression
 
   case 'Property':
@@ -637,6 +646,9 @@ switch (expression.type) {
   case 'Identifier':
     identifier = expression;
     break;
+  case 'AwaitExpression':
+    awaitExpression = expression;
+    break;
   default:
     never = expression;
 }
diff --git a/estree/index.d.ts b/estree/index.d.ts
index d086a6455d..26bccf1731 100644
--- a/estree/index.d.ts
+++ b/estree/index.d.ts
@@ -63,11 +63,13 @@ export interface Program extends BaseNode {
 interface BaseFunction extends BaseNode {
   params: Array<Pattern>;
   generator?: boolean;
+  async?: boolean;
   // The body is either BlockStatement or Expression because arrow functions
   // can have a body that's either. FunctionDeclarations and
-  // FunctionExpressions nave only BlockStatement bodies.
+  // FunctionExpressions have only BlockStatement bodies.
   body: BlockStatement | Expression;
 }
+
 export type Function =
     FunctionDeclaration | FunctionExpression | ArrowFunctionExpression;
 
@@ -208,7 +210,8 @@ type Expression =
     UpdateExpression | BinaryExpression | AssignmentExpression |
     LogicalExpression | MemberExpression | ConditionalExpression |
     CallExpression | NewExpression | SequenceExpression | TemplateLiteral |
-    TaggedTemplateExpression | ClassExpression | MetaProperty | Identifier;
+    TaggedTemplateExpression | ClassExpression | MetaProperty | Identifier |
+    AwaitExpression;
 export interface BaseExpression extends BaseNode { }
 
 export interface ThisExpression extends BaseExpression {
@@ -526,3 +529,8 @@ export interface ExportAllDeclaration extends BaseModuleDeclaration {
   type: "ExportAllDeclaration";
   source: Literal;
 }
+
+export interface AwaitExpression extends BaseExpression {
+  type: "AwaitExpression";
+  argument: Expression;
+}