Function walkPattern

tools/acorn-optimizer.mjs:112–128

(node, onExpr, onBoundIdent)

// Traverse a pattern node (identifier, object/array pattern, etc) invoking onExpr on any nested expressions and onBoundIdent on any bound identifiers.
function walkPattern(node, onExpr, onBoundIdent) {
  recursiveWalk(node, {
    AssignmentPattern(node, c) {
      c(node.left);
      onExpr(node.right);
    },
    Property(node, c) {
      if (node.computed) {
        onExpr(node.key);
      }
      c(node.value);
    },
    Identifier({name}) {
      onBoundIdent(name);
    },
  });
}

function hasSideEffects(node) {
  // Conservative analysis.