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import type { Document } from './doc/Document.js';
import type { Alias } from './nodes/Alias.js';
import { Node } from './nodes/Node.js';
import type { Pair } from './nodes/Pair.js';
import type { Scalar } from './nodes/Scalar.js';
import type { YAMLMap } from './nodes/YAMLMap.js';
import type { YAMLSeq } from './nodes/YAMLSeq.js';
export declare type visitorFn<T> = (key: number | 'key' | 'value' | null, node: T, path: readonly (Document | Node | Pair)[]) => void | symbol | number | Node | Pair;
export declare type visitor = visitorFn<unknown> | {
Alias?: visitorFn<Alias>;
Collection?: visitorFn<YAMLMap | YAMLSeq>;
Map?: visitorFn<YAMLMap>;
Node?: visitorFn<Alias | Scalar | YAMLMap | YAMLSeq>;
Pair?: visitorFn<Pair>;
Scalar?: visitorFn<Scalar>;
Seq?: visitorFn<YAMLSeq>;
Value?: visitorFn<Scalar | YAMLMap | YAMLSeq>;
};
export declare type asyncVisitorFn<T> = (key: number | 'key' | 'value' | null, node: T, path: readonly (Document | Node | Pair)[]) => void | symbol | number | Node | Pair | Promise<void | symbol | number | Node | Pair>;
export declare type asyncVisitor = asyncVisitorFn<unknown> | {
Alias?: asyncVisitorFn<Alias>;
Collection?: asyncVisitorFn<YAMLMap | YAMLSeq>;
Map?: asyncVisitorFn<YAMLMap>;
Node?: asyncVisitorFn<Alias | Scalar | YAMLMap | YAMLSeq>;
Pair?: asyncVisitorFn<Pair>;
Scalar?: asyncVisitorFn<Scalar>;
Seq?: asyncVisitorFn<YAMLSeq>;
Value?: asyncVisitorFn<Scalar | YAMLMap | YAMLSeq>;
};
/**
* Apply a visitor to an AST node or document.
*
* Walks through the tree (depth-first) starting from `node`, calling a
* `visitor` function with three arguments:
* - `key`: For sequence values and map `Pair`, the node's index in the
* collection. Within a `Pair`, `'key'` or `'value'`, correspondingly.
* `null` for the root node.
* - `node`: The current node.
* - `path`: The ancestry of the current node.
*
* The return value of the visitor may be used to control the traversal:
* - `undefined` (default): Do nothing and continue
* - `visit.SKIP`: Do not visit the children of this node, continue with next
* sibling
* - `visit.BREAK`: Terminate traversal completely
* - `visit.REMOVE`: Remove the current node, then continue with the next one
* - `Node`: Replace the current node, then continue by visiting it
* - `number`: While iterating the items of a sequence or map, set the index
* of the next step. This is useful especially if the index of the current
* node has changed.
*
* If `visitor` is a single function, it will be called with all values
* encountered in the tree, including e.g. `null` values. Alternatively,
* separate visitor functions may be defined for each `Map`, `Pair`, `Seq`,
* `Alias` and `Scalar` node. To define the same visitor function for more than
* one node type, use the `Collection` (map and seq), `Value` (map, seq & scalar)
* and `Node` (alias, map, seq & scalar) targets. Of all these, only the most
* specific defined one will be used for each node.
*/
export declare function visit(node: Node | Document | null, visitor: visitor): void;
export declare namespace visit {
var BREAK: symbol;
var SKIP: symbol;
var REMOVE: symbol;
}
/**
* Apply an async visitor to an AST node or document.
*
* Walks through the tree (depth-first) starting from `node`, calling a
* `visitor` function with three arguments:
* - `key`: For sequence values and map `Pair`, the node's index in the
* collection. Within a `Pair`, `'key'` or `'value'`, correspondingly.
* `null` for the root node.
* - `node`: The current node.
* - `path`: The ancestry of the current node.
*
* The return value of the visitor may be used to control the traversal:
* - `Promise`: Must resolve to one of the following values
* - `undefined` (default): Do nothing and continue
* - `visit.SKIP`: Do not visit the children of this node, continue with next
* sibling
* - `visit.BREAK`: Terminate traversal completely
* - `visit.REMOVE`: Remove the current node, then continue with the next one
* - `Node`: Replace the current node, then continue by visiting it
* - `number`: While iterating the items of a sequence or map, set the index
* of the next step. This is useful especially if the index of the current
* node has changed.
*
* If `visitor` is a single function, it will be called with all values
* encountered in the tree, including e.g. `null` values. Alternatively,
* separate visitor functions may be defined for each `Map`, `Pair`, `Seq`,
* `Alias` and `Scalar` node. To define the same visitor function for more than
* one node type, use the `Collection` (map and seq), `Value` (map, seq & scalar)
* and `Node` (alias, map, seq & scalar) targets. Of all these, only the most
* specific defined one will be used for each node.
*/
export declare function visitAsync(node: Node | Document | null, visitor: asyncVisitor): Promise<void>;
export declare namespace visitAsync {
var BREAK: symbol;
var SKIP: symbol;
var REMOVE: symbol;
}
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