Can transformations be immutable?

Is it possible to modify nodes in an immutable way? eg,

// Redact all text nodes
node = visit(node, (child) => {
  if (child.type === 'text') {
    return { ...child, value: '[redacted]' }
  }
})

[wooorm]

unist-util-visit is almost always good enough, and unist-util-visit-parents (used in the former) if you need to access all parents

[wooorm]

Yes, I do. Plugins are always the slowest in the unified process. Copying a syntax-tree for 1mb of say markdown is a gigantically slow operation. Mutating a couple of things is faster.