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rOACCT/node_modules/estree-walker/src/estree-walker.js
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estree-walker.js
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			function walk(ast, { enter, leave }) {
			return visit(ast, null, enter, leave);
			}

			let should_skip = false;
			let should_remove = false;
			let replacement = null;
			const context = {
			skip: () => should_skip = true,
			remove: () => should_remove = true,
			replace: (node) => replacement = node
			};

			const childKeys = {};

			function replace(parent, prop, index, node) {
			if (parent) {
			if (index !== null) {
			parent[prop][index] = node;
			} else {
			parent[prop] = node;
			}
			}
			}

			function remove(parent, prop, index) {
			if (parent) {
			if (index !== null) {
			parent[prop].splice(index, 1);
			} else {
			delete parent[prop];
			}
			}
			}

			function visit(
			node,
			parent,
			enter,
			leave,
			prop,
			index
			) {
			if (node) {
			if (enter) {
			const _should_skip = should_skip;
			const _should_remove = should_remove;
			const _replacement = replacement;
			should_skip = false;
			should_remove = false;
			replacement = null;

			enter.call(context, node, parent, prop, index);

			if (replacement) {
			node = replacement;
			replace(parent, prop, index, node);
			}

			if (should_remove) {
			remove(parent, prop, index);
			}

			const skipped = should_skip;
			const removed = should_remove;

			should_skip = _should_skip;
			should_remove = _should_remove;
			replacement = _replacement;

			if (skipped) return node;
			if (removed) return null;
			}

			const keys = node.type && childKeys[node.type] \|\| (
			childKeys[node.type] = Object.keys(node).filter(key => typeof (node )[key] === 'object')
			);

			for (let i = 0; i < keys.length; i += 1) {
			const key = keys[i];
			const value = (node )[key];

			if (Array.isArray(value)) {
			for (let j = 0, k = 0; j < value.length; j += 1, k += 1) {
			if (value[j] && value[j].type) {
			if (!visit(value[j], node, enter, leave, key, k)) {
			// removed
			j--;
			}
			}
			}
			}

			else if (value && value.type) {
			visit(value, node, enter, leave, key, null);
			}
			}

			if (leave) {
			const _replacement = replacement;
			const _should_remove = should_remove;
			replacement = null;
			should_remove = false;

			leave.call(context, node, parent, prop, index);

			if (replacement) {
			node = replacement;
			replace(parent, prop, index, node);
			}

			if (should_remove) {
			remove(parent, prop, index);
			}

			const removed = should_remove;

			replacement = _replacement;
			should_remove = _should_remove;

			if (removed) return null;
			}
			}

			return node;
			}

			export { walk, childKeys };