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Estraverse (estraverse) is ECMAScript traversal functions from esmangle project.

The following code will output all variables declared at the root of a file.

estraverse.traverse(ast, {
    enter: function (node, parent) {
        if (node.type == 'FunctionExpression' || node.type == 'FunctionDeclaration')
            return estraverse.VisitorOption.Skip;
    },
    leave: function (node, parent) {
        if (node.type == 'VariableDeclarator')
          console.log(node.id.name);
    }
});

We can use this.skip and this.break functions instead of using Skip and Break.

estraverse.traverse(ast, {
    enter: function (node) {
        this.break();
    }
});

And estraverse provides estraverse.replace function. When returning node from enter/leave, current node is replaced with it.

result = estraverse.replace(tree, {
    enter: function (node) {
        // Replace it with replaced.
        if (node.type === 'Literal')
            return replaced;
    }
});

Copyright (C) 2012-2013 Yusuke Suzuki (twitter: @Constellation) and other contributors.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

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• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

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