unist utility types

• What is this?
• Install
• Use
• API
  • Ancestor<Tree, Child>
  • Children<T>
  • Column
  • Decrement<[I]>
  • InclusiveDescendant<Tree[, Max][, Depth]>
  • Increment<[I]>
  • Index
  • IsAncestor<Tree, Child[, Max][, Depth]>
  • IsParent<Tree, Child>
  • Line
  • Match<N, Check>
  • MatchChildren<N[, Check]>
  • MatchInclusiveDescendant<Tree, Check[, Max]>
  • MatchProperties<N[, Check]>
  • MatchValue<N[, Check]>
  • Offset
  • Parents<Tree[, Child]>
  • PositionalInfo<[T]>
  • Test
  • TestFunction<[T][, P][, U]>
    • fn(node[, index][, parent])
  • Type<[T]>
  • Uint
  • Value<[T]>
• Contribute

This package contains TypeScript definitions for working with unist and its ecosystem of utilities.

This package is ESM only.

In Node.js (version 18+) with yarn:

yarn add -D @flex-development/unist-util-types @types/unist

See Git - Protocols | Yarn  for details regarding installing from Git.

import type {
  Ancestor,
  Children,
  Column,
  InclusiveDescendant,
  Index,
  Line,
  Match,
  MatchChildren,
  MatchInclusiveDescendant,
  MatchProperties,
  MatchValue,
  Offset,
  Parents,
  PositionalInfo,
  Test,
  TestFunction,
  Type,
  Value
} from '@flex-development/unist-util-types'

Collect nodes in Tree that can be ancestors of Child.

• Tree (Node): tree to collect ancestors from
• Child (Node): expected child node

source: src/ancestor.ts

Extract children from tree T.

• T (Node): tree to extract children from

source: src/children.ts

Column in a source file (1-indexed integer).

source: src/column.ts

Subtract 1 from I while I is in the range [1, 10].

• I (Uint): number to subtract from
  • default: 10

source: src/decrement.ts

Collect all inclusive descendants of Tree.

• Tree (Node): tree to collect descendants from
• Max (Uint): maximum search depth
  • default: 10
• Depth (Uint): current search depth
  • default: 0

source: src/descendant-inclusive.ts

Add 1 to I while I is in the range [0, 9].

• I (Uint): number to add to
  • default: 0

source: src/increment.ts

Number of preceding siblings of a child node.

source: src/index-number.ts

Check if Tree is an ancestor of Child.

• Tree (Node): tree to check
• Child (Node): expected child node
• Max (Uint): maximum search depth
  • default: 10
• Depth (Uint): current search depth
  • default: 0

source: src/is-ancestor.ts

Check if Tree is the parent of Child.

• Tree (Node): tree to check
• Child (Node): expected child node

source: src/is-parent.ts

Line in a source file (1-indexed integer).

source: src/line.ts

Check if node N passes a test.

• N (Node): node to check
• Check (Test): node test

source: src/match.ts

Extract children from node N if it passes a test.

• N (Node): node to check
• Check (Test): node test
  • default: Test

source: src/match-children.ts

Check if inclusive descendants of Tree pass a test.

• Tree (Node): tree to check
• Check (Test): node test
• Max (Uint): maximum search depth
  • default: 10

source: src/src/match-descendant-inclusive.ts

Extract properties of node N if it passes a test.

Properties of N are all fields except type.

• N (Node): node to check
• Check (Test): node test
  • default: Test

source: src/match-properties.ts

Extract the value of node N if it passes a test.

• N (Node): node to check
• Check (Test): node test
  • default: Test

source: src/match-value.ts

Index of a character in a source file (0-indexed integer).

source: src/offset.ts

Collect nodes in Tree that can be parents of Child.

All parents will be included in the resulting union if Child is any.

• Tree (Node): tree to collect parents from
• Child (Node): expected child node
  • default: any

source: src/parents.ts

Object containing the positional information of tree T.

• T (Node): tree to get positional information from
  • default: Node

source: src/positional-info.ts

Union of test types for a Node.

See unist-util-is for more details.

source: src/test.ts

Check if a node passes a test.

• T (Node): node to check
  • default: Node
• P (Parent): parent(s) of node T
  • default: Parent
• U (any): this context
  • default: unknown

Parameters:

• node (T): node to check
• index (Index | undefined): index of node in parent.children
• parent (Parent | undefined): parent of node

Returns:

boolean | undefined | void test result for node

source: src/test-function.ts

Extract type from tree T.

• T (Node): tree to extract type from
  • default: Node

source: src/type.ts

Number used for iteration.

Range: [0, 10]

source: src/uint.ts

Extract the value of tree T.

• T (Node): tree to extract value from
  • default: Literal

source: src/value.ts

See CONTRIBUTING.md.

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