var util = require("../../util");
var t = require("../../types");
exports.optional = true;
exports.ForOfStatement = function (node, parent, file, scope) {
var left = node.left;
var declar, id;
if (t.isIdentifier(left) || t.isPattern(left)) {
id = left;
} else if (t.isVariableDeclaration(left)) {
id = left.declarations[0].id;
declar = t.variableDeclaration(left.kind, [
t.variableDeclarator(id)
]);
} else {
throw file.errorWithNode(left, "Unknown node type " + left.type + " in ForOfStatement");
}
var node2 = util.template("for-of-fast", {
LOOP_OBJECT: file.generateUidIdentifier("loopObject", scope),
IS_ARRAY: file.generateUidIdentifier("isArray", scope),
OBJECT: node.right,
INDEX: file.generateUidIdentifier("i", scope),
ID: id
});
t.inheritsComments(node2, node);
t.ensureBlock(node);
var block = node2.body;
if (declar) block.body.unshift(declar);
block.body = block.body.concat(node.body.body);
return node2;
};
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