Support async iteration statement `for-await-of` introduced in ES2018
refs: https://tc39.github.io/proposal-async-iteration/
refs: https://github.com/tc39/proposal-async-iteration#the-async-iteration-statement-for-await-of
refs: https://github.com/estree/estree/pull/185
diff --git a/escodegen.js b/escodegen.js
index f4de692..3d864bb 100644
--- a/escodegen.js
+++ b/escodegen.js
@@ -951,7 +951,7 @@
};
CodeGenerator.prototype.generateIterationForStatement = function (operator, stmt, flags) {
- var result = ['for' + space + '('], that = this;
+ var result = ['for' + space + (stmt.await ? 'await' + space : '') + '('], that = this;
withIndent(function () {
if (stmt.left.type === Syntax.VariableDeclaration) {
withIndent(function () {
diff --git a/test/harmony.js b/test/harmony.js
index fe836b8..0237b82 100644
--- a/test/harmony.js
+++ b/test/harmony.js
@@ -6208,6 +6208,78 @@
"async": true
}
},
+ },
+
+ 'ES2018 for-await-of': {
+ 'async function f() {\n for await (const x of ait) {\n console.log(x);\n }\n}': {
+ generateFrom: {
+ "type": "FunctionDeclaration",
+ "id": {
+ "type": "Identifier",
+ "name": "f"
+ },
+ "params": [],
+ "body": {
+ "type": "BlockStatement",
+ "body": [
+ {
+ "type": "ForOfStatement",
+ "left": {
+ "type": "VariableDeclaration",
+ "declarations": [
+ {
+ "type": "VariableDeclarator",
+ "id": {
+ "type": "Identifier",
+ "name": "x"
+ },
+ "init": null
+ }
+ ],
+ "kind": "const"
+ },
+ "right": {
+ "type": "Identifier",
+ "name": "ait"
+ },
+ "body": {
+ "type": "BlockStatement",
+ "body": [
+ {
+ "type": "ExpressionStatement",
+ "expression": {
+ "type": "CallExpression",
+ "callee": {
+ "type": "MemberExpression",
+ "object": {
+ "type": "Identifier",
+ "name": "console"
+ },
+ "property": {
+ "type": "Identifier",
+ "name": "log"
+ },
+ "computed": false
+ },
+ "arguments": [
+ {
+ "type": "Identifier",
+ "name": "x"
+ }
+ ]
+ }
+ }
+ ]
+ },
+ "await": true
+ }
+ ]
+ },
+ "generator": false,
+ "async": true
+ }
+ }
+
}
};
