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[asyncIter]\n : [asyncIter, state.addHelper(\"awaitAsyncGenerator\")],\n );\n },\n },\n environmentVisitor,\n ]);\n\n const forAwaitVisitor = traverse.visitors.merge<PluginPass>([\n {\n ArrowFunctionExpression(path) {\n path.skip();\n },\n\n ForOfStatement(path: NodePath<t.ForOfStatement>, { file }) {\n const { node } = path;\n if (!node.await) return;\n\n const build = rewriteForAwait(path, {\n getAsyncIterator: file.addHelper(\"asyncIterator\"),\n });\n\n const { declar, loop } = build;\n const block = loop.body as t.BlockStatement;\n\n // ensure that it's a block so we can take all its statements\n path.ensureBlock();\n\n // add the value declaration to the new loop body\n if (declar) {\n block.body.push(declar);\n if (path.node.body.body.length) {\n block.body.push(t.blockStatement(path.node.body.body));\n }\n } else {\n block.body.push(...path.node.body.body);\n }\n\n t.inherits(loop, node);\n t.inherits(loop.body, node.body);\n\n if (build.replaceParent) {\n path.parentPath.replaceWithMultiple(build.node);\n } else {\n path.replaceWithMultiple(build.node);\n }\n },\n },\n environmentVisitor,\n ]);\n\n const visitor: Visitor<PluginPass> = {\n Function(path, state) {\n if (!path.node.async) return;\n\n path.traverse(forAwaitVisitor, state);\n\n if (!path.node.generator) return;\n\n path.traverse(yieldStarVisitor, state);\n\n // We don't need to pass the noNewArrows assumption, since\n // async generators are never arrow functions.\n remapAsyncToGenerator(path, {\n wrapAsync: state.addHelper(\"wrapAsyncGenerator\"),\n wrapAwait: state.addHelper(\"awaitAsyncGenerator\"),\n });\n },\n };\n\n return {\n name: \"proposal-async-generator-functions\",\n inherits: syntaxAsyncGenerators.default,\n\n visitor: {\n Program(path, state) {\n // We need to traverse the ast here (instead of just vising Function\n // in the top level visitor) because for-await needs to run before the\n // async-to-generator plugin. 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