Refactor routing in App component to enhance navigation and improve error handling by integrating dynamic routes and updating the NotFound route.

node_modules/unist-util-is/index.d.ts

@@ -0,0 +1,4 @@
+export type Check = import('./lib/index.js').Check
+export type Test = import('./lib/index.js').Test
+export type TestFunction = import('./lib/index.js').TestFunction
+export {is, convert} from './lib/index.js'

node_modules/unist-util-is/index.js

@@ -0,0 +1,7 @@
+/**
+ * @typedef {import('./lib/index.js').Check} Check
+ * @typedef {import('./lib/index.js').Test} Test
+ * @typedef {import('./lib/index.js').TestFunction} TestFunction
+ */
+
+export {is, convert} from './lib/index.js'

node_modules/unist-util-is/lib/index.d.ts

@@ -0,0 +1,196 @@
+/**
+ * @typedef {import('unist').Node} Node
+ * @typedef {import('unist').Parent} Parent
+ */
+/**
+ * @template Fn
+ * @template Fallback
+ * @typedef {Fn extends (value: any) => value is infer Thing ? Thing : Fallback} Predicate
+ */
+/**
+ * @callback Check
+ *   Check that an arbitrary value is a node.
+ * @param {unknown} this
+ *   The given context.
+ * @param {unknown} [node]
+ *   Anything (typically a node).
+ * @param {number | null | undefined} [index]
+ *   The node’s position in its parent.
+ * @param {Parent | null | undefined} [parent]
+ *   The node’s parent.
+ * @returns {boolean}
+ *   Whether this is a node and passes a test.
+ *
+ * @typedef {Record<string, unknown> | Node} Props
+ *   Object to check for equivalence.
+ *
+ *   Note: `Node` is included as it is common but is not indexable.
+ *
+ * @typedef {Array<Props | TestFunction | string> | Props | TestFunction | string | null | undefined} Test
+ *   Check for an arbitrary node.
+ *
+ * @callback TestFunction
+ *   Check if a node passes a test.
+ * @param {unknown} this
+ *   The given context.
+ * @param {Node} node
+ *   A node.
+ * @param {number | undefined} [index]
+ *   The node’s position in its parent.
+ * @param {Parent | undefined} [parent]
+ *   The node’s parent.
+ * @returns {boolean | undefined | void}
+ *   Whether this node passes the test.
+ *
+ *   Note: `void` is included until TS sees no return as `undefined`.
+ */
+/**
+ * Check if `node` is a `Node` and whether it passes the given test.
+ *
+ * @param {unknown} node
+ *   Thing to check, typically `Node`.
+ * @param {Test} test
+ *   A check for a specific node.
+ * @param {number | null | undefined} index
+ *   The node’s position in its parent.
+ * @param {Parent | null | undefined} parent
+ *   The node’s parent.
+ * @param {unknown} context
+ *   Context object (`this`) to pass to `test` functions.
+ * @returns {boolean}
+ *   Whether `node` is a node and passes a test.
+ */
+export const is: (<Condition extends string>(
+  node: unknown,
+  test: Condition,
+  index?: number | null | undefined,
+  parent?: Parent | null | undefined,
+  context?: unknown
+) => node is import('unist').Node & {
+  type: Condition
+}) &
+  (<Condition_1 extends Props>(
+    node: unknown,
+    test: Condition_1,
+    index?: number | null | undefined,
+    parent?: Parent | null | undefined,
+    context?: unknown
+  ) => node is import('unist').Node & Condition_1) &
+  (<Condition_2 extends TestFunction>(
+    node: unknown,
+    test: Condition_2,
+    index?: number | null | undefined,
+    parent?: Parent | null | undefined,
+    context?: unknown
+  ) => node is import('unist').Node &
+    Predicate<Condition_2, import('unist').Node>) &
+  ((node?: null | undefined) => false) &
+  ((
+    node: unknown,
+    test?: null | undefined,
+    index?: number | null | undefined,
+    parent?: Parent | null | undefined,
+    context?: unknown
+  ) => node is import('unist').Node) &
+  ((
+    node: unknown,
+    test?: Test,
+    index?: number | null | undefined,
+    parent?: Parent | null | undefined,
+    context?: unknown
+  ) => boolean)
+/**
+ * Generate an assertion from a test.
+ *
+ * Useful if you’re going to test many nodes, for example when creating a
+ * utility where something else passes a compatible test.
+ *
+ * The created function is a bit faster because it expects valid input only:
+ * a `node`, `index`, and `parent`.
+ *
+ * @param {Test} test
+ *   *   when nullish, checks if `node` is a `Node`.
+ *   *   when `string`, works like passing `(node) => node.type === test`.
+ *   *   when `function` checks if function passed the node is true.
+ *   *   when `object`, checks that all keys in test are in node, and that they have (strictly) equal values.
+ *   *   when `array`, checks if any one of the subtests pass.
+ * @returns {Check}
+ *   An assertion.
+ */
+export const convert: (<Condition extends string>(
+  test: Condition
+) => (
+  node: unknown,
+  index?: number | null | undefined,
+  parent?: Parent | null | undefined,
+  context?: unknown
+) => node is import('unist').Node & {
+  type: Condition
+}) &
+  (<Condition_1 extends Props>(
+    test: Condition_1
+  ) => (
+    node: unknown,
+    index?: number | null | undefined,
+    parent?: Parent | null | undefined,
+    context?: unknown
+  ) => node is import('unist').Node & Condition_1) &
+  (<Condition_2 extends TestFunction>(
+    test: Condition_2
+  ) => (
+    node: unknown,
+    index?: number | null | undefined,
+    parent?: Parent | null | undefined,
+    context?: unknown
+  ) => node is import('unist').Node &
+    Predicate<Condition_2, import('unist').Node>) &
+  ((
+    test?: null | undefined
+  ) => (
+    node?: unknown,
+    index?: number | null | undefined,
+    parent?: Parent | null | undefined,
+    context?: unknown
+  ) => node is import('unist').Node) &
+  ((test?: Test) => Check)
+export type Node = import('unist').Node
+export type Parent = import('unist').Parent
+export type Predicate<Fn, Fallback> = Fn extends (
+  value: any
+) => value is infer Thing
+  ? Thing
+  : Fallback
+/**
+ * Check that an arbitrary value is a node.
+ */
+export type Check = (
+  this: unknown,
+  node?: unknown,
+  index?: number | null | undefined,
+  parent?: Parent | null | undefined
+) => boolean
+/**
+ * Object to check for equivalence.
+ *
+ * Note: `Node` is included as it is common but is not indexable.
+ */
+export type Props = Record<string, unknown> | Node
+/**
+ * Check for an arbitrary node.
+ */
+export type Test =
+  | Array<Props | TestFunction | string>
+  | Props
+  | TestFunction
+  | string
+  | null
+  | undefined
+/**
+ * Check if a node passes a test.
+ */
+export type TestFunction = (
+  this: unknown,
+  node: Node,
+  index?: number | undefined,
+  parent?: Parent | undefined
+) => boolean | undefined | void

node_modules/unist-util-is/lib/index.js

@@ -0,0 +1,291 @@
+/**
+ * @typedef {import('unist').Node} Node
+ * @typedef {import('unist').Parent} Parent
+ */
+
+/**
+ * @template Fn
+ * @template Fallback
+ * @typedef {Fn extends (value: any) => value is infer Thing ? Thing : Fallback} Predicate
+ */
+
+/**
+ * @callback Check
+ *   Check that an arbitrary value is a node.
+ * @param {unknown} this
+ *   The given context.
+ * @param {unknown} [node]
+ *   Anything (typically a node).
+ * @param {number | null | undefined} [index]
+ *   The node’s position in its parent.
+ * @param {Parent | null | undefined} [parent]
+ *   The node’s parent.
+ * @returns {boolean}
+ *   Whether this is a node and passes a test.
+ *
+ * @typedef {Record<string, unknown> | Node} Props
+ *   Object to check for equivalence.
+ *
+ *   Note: `Node` is included as it is common but is not indexable.
+ *
+ * @typedef {Array<Props | TestFunction | string> | Props | TestFunction | string | null | undefined} Test
+ *   Check for an arbitrary node.
+ *
+ * @callback TestFunction
+ *   Check if a node passes a test.
+ * @param {unknown} this
+ *   The given context.
+ * @param {Node} node
+ *   A node.
+ * @param {number | undefined} [index]
+ *   The node’s position in its parent.
+ * @param {Parent | undefined} [parent]
+ *   The node’s parent.
+ * @returns {boolean | undefined | void}
+ *   Whether this node passes the test.
+ *
+ *   Note: `void` is included until TS sees no return as `undefined`.
+ */
+
+/**
+ * Check if `node` is a `Node` and whether it passes the given test.
+ *
+ * @param {unknown} node
+ *   Thing to check, typically `Node`.
+ * @param {Test} test
+ *   A check for a specific node.
+ * @param {number | null | undefined} index
+ *   The node’s position in its parent.
+ * @param {Parent | null | undefined} parent
+ *   The node’s parent.
+ * @param {unknown} context
+ *   Context object (`this`) to pass to `test` functions.
+ * @returns {boolean}
+ *   Whether `node` is a node and passes a test.
+ */
+export const is =
+  // Note: overloads in JSDoc can’t yet use different `@template`s.
+  /**
+   * @type {(
+   *   (<Condition extends string>(node: unknown, test: Condition, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => node is Node & {type: Condition}) &
+   *   (<Condition extends Props>(node: unknown, test: Condition, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => node is Node & Condition) &
+   *   (<Condition extends TestFunction>(node: unknown, test: Condition, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => node is Node & Predicate<Condition, Node>) &
+   *   ((node?: null | undefined) => false) &
+   *   ((node: unknown, test?: null | undefined, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => node is Node) &
+   *   ((node: unknown, test?: Test, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => boolean)
+   * )}
+   */
+  (
+    /**
+     * @param {unknown} [node]
+     * @param {Test} [test]
+     * @param {number | null | undefined} [index]
+     * @param {Parent | null | undefined} [parent]
+     * @param {unknown} [context]
+     * @returns {boolean}
+     */
+    // eslint-disable-next-line max-params
+    function (node, test, index, parent, context) {
+      const check = convert(test)
+
+      if (
+        index !== undefined &&
+        index !== null &&
+        (typeof index !== 'number' ||
+          index < 0 ||
+          index === Number.POSITIVE_INFINITY)
+      ) {
+        throw new Error('Expected positive finite index')
+      }
+
+      if (
+        parent !== undefined &&
+        parent !== null &&
+        (!is(parent) || !parent.children)
+      ) {
+        throw new Error('Expected parent node')
+      }
+
+      if (
+        (parent === undefined || parent === null) !==
+        (index === undefined || index === null)
+      ) {
+        throw new Error('Expected both parent and index')
+      }
+
+      return looksLikeANode(node)
+        ? check.call(context, node, index, parent)
+        : false
+    }
+  )
+
+/**
+ * Generate an assertion from a test.
+ *
+ * Useful if you’re going to test many nodes, for example when creating a
+ * utility where something else passes a compatible test.
+ *
+ * The created function is a bit faster because it expects valid input only:
+ * a `node`, `index`, and `parent`.
+ *
+ * @param {Test} test
+ *   *   when nullish, checks if `node` is a `Node`.
+ *   *   when `string`, works like passing `(node) => node.type === test`.
+ *   *   when `function` checks if function passed the node is true.
+ *   *   when `object`, checks that all keys in test are in node, and that they have (strictly) equal values.
+ *   *   when `array`, checks if any one of the subtests pass.
+ * @returns {Check}
+ *   An assertion.
+ */
+export const convert =
+  // Note: overloads in JSDoc can’t yet use different `@template`s.
+  /**
+   * @type {(
+   *   (<Condition extends string>(test: Condition) => (node: unknown, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => node is Node & {type: Condition}) &
+   *   (<Condition extends Props>(test: Condition) => (node: unknown, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => node is Node & Condition) &
+   *   (<Condition extends TestFunction>(test: Condition) => (node: unknown, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => node is Node & Predicate<Condition, Node>) &
+   *   ((test?: null | undefined) => (node?: unknown, index?: number | null | undefined, parent?: Parent | null | undefined, context?: unknown) => node is Node) &
+   *   ((test?: Test) => Check)
+   * )}
+   */
+  (
+    /**
+     * @param {Test} [test]
+     * @returns {Check}
+     */
+    function (test) {
+      if (test === null || test === undefined) {
+        return ok
+      }
+
+      if (typeof test === 'function') {
+        return castFactory(test)
+      }
+
+      if (typeof test === 'object') {
+        return Array.isArray(test) ? anyFactory(test) : propsFactory(test)
+      }
+
+      if (typeof test === 'string') {
+        return typeFactory(test)
+      }
+
+      throw new Error('Expected function, string, or object as test')
+    }
+  )
+
+/**
+ * @param {Array<Props | TestFunction | string>} tests
+ * @returns {Check}
+ */
+function anyFactory(tests) {
+  /** @type {Array<Check>} */
+  const checks = []
+  let index = -1
+
+  while (++index < tests.length) {
+    checks[index] = convert(tests[index])
+  }
+
+  return castFactory(any)
+
+  /**
+   * @this {unknown}
+   * @type {TestFunction}
+   */
+  function any(...parameters) {
+    let index = -1
+
+    while (++index < checks.length) {
+      if (checks[index].apply(this, parameters)) return true
+    }
+
+    return false
+  }
+}
+
+/**
+ * Turn an object into a test for a node with a certain fields.
+ *
+ * @param {Props} check
+ * @returns {Check}
+ */
+function propsFactory(check) {
+  const checkAsRecord = /** @type {Record<string, unknown>} */ (check)
+
+  return castFactory(all)
+
+  /**
+   * @param {Node} node
+   * @returns {boolean}
+   */
+  function all(node) {
+    const nodeAsRecord = /** @type {Record<string, unknown>} */ (
+      /** @type {unknown} */ (node)
+    )
+
+    /** @type {string} */
+    let key
+
+    for (key in check) {
+      if (nodeAsRecord[key] !== checkAsRecord[key]) return false
+    }
+
+    return true
+  }
+}
+
+/**
+ * Turn a string into a test for a node with a certain type.
+ *
+ * @param {string} check
+ * @returns {Check}
+ */
+function typeFactory(check) {
+  return castFactory(type)
+
+  /**
+   * @param {Node} node
+   */
+  function type(node) {
+    return node && node.type === check
+  }
+}
+
+/**
+ * Turn a custom test into a test for a node that passes that test.
+ *
+ * @param {TestFunction} testFunction
+ * @returns {Check}
+ */
+function castFactory(testFunction) {
+  return check
+
+  /**
+   * @this {unknown}
+   * @type {Check}
+   */
+  function check(value, index, parent) {
+    return Boolean(
+      looksLikeANode(value) &&
+        testFunction.call(
+          this,
+          value,
+          typeof index === 'number' ? index : undefined,
+          parent || undefined
+        )
+    )
+  }
+}
+
+function ok() {
+  return true
+}
+
+/**
+ * @param {unknown} value
+ * @returns {value is Node}
+ */
+function looksLikeANode(value) {
+  return value !== null && typeof value === 'object' && 'type' in value
+}

node_modules/unist-util-is/license

@@ -0,0 +1,22 @@
+(The MIT license)
+
+Copyright (c) 2015 Titus Wormer <tituswormer@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/unist-util-is/package.json

@@ -0,0 +1,100 @@
+{
+  "name": "unist-util-is",
+  "version": "6.0.0",
+  "description": "unist utility to check if a node passes a test",
+  "license": "MIT",
+  "keywords": [
+    "unist",
+    "unist-util",
+    "util",
+    "utility",
+    "tree",
+    "node",
+    "is",
+    "equal",
+    "check",
+    "test",
+    "type"
+  ],
+  "repository": "syntax-tree/unist-util-is",
+  "bugs": "https://github.com/syntax-tree/unist-util-is/issues",
+  "funding": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/unified"
+  },
+  "author": "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
+  "contributors": [
+    "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
+    "Christian Murphy <christian.murphy.42@gmail.com>",
+    "Lucas Brandstaetter <lucas@brandstaetter.tech> (https://github.com/Roang-zero1)"
+  ],
+  "sideEffects": false,
+  "type": "module",
+  "exports": "./index.js",
+  "files": [
+    "lib/",
+    "index.d.ts",
+    "index.js"
+  ],
+  "dependencies": {
+    "@types/unist": "^3.0.0"
+  },
+  "devDependencies": {
+    "@types/mdast": "^4.0.0",
+    "@types/node": "^20.0.0",
+    "c8": "^8.0.0",
+    "prettier": "^2.0.0",
+    "remark-cli": "^11.0.0",
+    "remark-preset-wooorm": "^9.0.0",
+    "tsd": "^0.28.0",
+    "type-coverage": "^2.0.0",
+    "typescript": "^5.0.0",
+    "xo": "^0.54.0"
+  },
+  "scripts": {
+    "prepack": "npm run build && npm run format",
+    "build": "tsc --build --clean && tsc --build && tsd && type-coverage",
+    "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
+    "test-api": "node --conditions development test/index.js",
+    "test-coverage": "c8 --100 --reporter lcov npm run test-api",
+    "test": "npm run build && npm run format && npm run test-coverage"
+  },
+  "prettier": {
+    "bracketSpacing": false,
+    "semi": false,
+    "singleQuote": true,
+    "tabWidth": 2,
+    "trailingComma": "none",
+    "useTabs": false
+  },
+  "remarkConfig": {
+    "plugins": [
+      "remark-preset-wooorm"
+    ]
+  },
+  "typeCoverage": {
+    "atLeast": 100,
+    "detail": true,
+    "#": "needed `any`s",
+    "ignoreFiles": [
+      "lib/index.d.ts"
+    ],
+    "ignoreCatch": true,
+    "strict": true
+  },
+  "xo": {
+    "overrides": [
+      {
+        "files": [
+          "**/*.ts"
+        ],
+        "rules": {
+          "@typescript-eslint/consistent-type-definitions": "off",
+          "@typescript-eslint/no-unnecessary-type-arguments": "off",
+          "import/no-extraneous-dependencies": "off"
+        }
+      }
+    ],
+    "prettier": true
+  }
+}

node_modules/unist-util-is/readme.md

@@ -0,0 +1,351 @@
+# unist-util-is
+
+[![Build][build-badge]][build]
+[![Coverage][coverage-badge]][coverage]
+[![Downloads][downloads-badge]][downloads]
+[![Size][size-badge]][size]
+[![Sponsors][sponsors-badge]][collective]
+[![Backers][backers-badge]][collective]
+[![Chat][chat-badge]][chat]
+
+[unist][] utility to check if nodes pass a test.
+
+## Contents
+
+*   [What is this?](#what-is-this)
+*   [When should I use this?](#when-should-i-use-this)
+*   [Install](#install)
+*   [Use](#use)
+*   [API](#api)
+    *   [`is(node[, test[, index, parent[, context]]])`](#isnode-test-index-parent-context)
+    *   [`convert(test)`](#converttest)
+    *   [`Check`](#check)
+    *   [`Test`](#test)
+    *   [`TestFunction`](#testfunction)
+*   [Examples](#examples)
+    *   [Example of `convert`](#example-of-convert)
+*   [Types](#types)
+*   [Compatibility](#compatibility)
+*   [Related](#related)
+*   [Contribute](#contribute)
+*   [License](#license)
+
+## What is this?
+
+This package is a small utility that checks that a node is a certain node.
+
+## When should I use this?
+
+Use this small utility if you find yourself repeating code for checking what
+nodes are.
+
+A similar package, [`hast-util-is-element`][hast-util-is-element], works on hast
+elements.
+
+For more advanced tests, [`unist-util-select`][unist-util-select] can be used
+to match against CSS selectors.
+
+## Install
+
+This package is [ESM only][esm].
+In Node.js (version 16+), install with [npm][]:
+
+```sh
+npm install unist-util-is
+```
+
+In Deno with [`esm.sh`][esmsh]:
+
+```js
+import {is} from 'https://esm.sh/unist-util-is@6'
+```
+
+In browsers with [`esm.sh`][esmsh]:
+
+```html
+<script type="module">
+  import {is} from 'https://esm.sh/unist-util-is@6?bundle'
+</script>
+```
+
+## Use
+
+```js
+import {is} from 'unist-util-is'
+
+const node = {type: 'strong'}
+const parent = {type: 'paragraph', children: [node]}
+
+is() // => false
+is({children: []}) // => false
+is(node) // => true
+is(node, 'strong') // => true
+is(node, 'emphasis') // => false
+
+is(node, node) // => true
+is(parent, {type: 'paragraph'}) // => true
+is(parent, {type: 'strong'}) // => false
+
+is(node, test) // => false
+is(node, test, 4, parent) // => false
+is(node, test, 5, parent) // => true
+
+function test(node, n) {
+  return n === 5
+}
+```
+
+## API
+
+This package exports the identifiers [`convert`][api-convert] and
+[`is`][api-is].
+There is no default export.
+
+### `is(node[, test[, index, parent[, context]]])`
+
+Check if `node` is a `Node` and whether it passes the given test.
+
+###### Parameters
+
+*   `node` (`unknown`, optional)
+    — thing to check, typically [`Node`][node]
+*   `test` ([`Test`][api-test], optional)
+    — a test for a specific element
+*   `index` (`number`, optional)
+    — the node’s position in its parent
+*   `parent` ([`Node`][node], optional)
+    — the node’s parent
+*   `context` (`unknown`, optional)
+    — context object (`this`) to call `test` with
+
+###### Returns
+
+Whether `node` is a [`Node`][node] and passes a test (`boolean`).
+
+###### Throws
+
+When an incorrect `test`, `index`, or `parent` is given.
+There is no error thrown when `node` is not a node.
+
+### `convert(test)`
+
+Generate a check from a test.
+
+Useful if you’re going to test many nodes, for example when creating a
+utility where something else passes a compatible test.
+
+The created function is a bit faster because it expects valid input only:
+a `node`, `index`, and `parent`.
+
+###### Parameters
+
+*   `test` ([`Test`][api-test], optional)
+    — a test for a specific node
+
+###### Returns
+
+A check ([`Check`][api-check]).
+
+### `Check`
+
+Check that an arbitrary value is a node (TypeScript type).
+
+###### Parameters
+
+*   `this` (`unknown`, optional)
+    — context object (`this`) to call `test` with
+*   `node` (`unknown`)
+    — anything (typically a node)
+*   `index` (`number`, optional)
+    — the node’s position in its parent
+*   `parent` ([`Node`][node], optional)
+    — the node’s parent
+
+###### Returns
+
+Whether this is a node and passes a test (`boolean`).
+
+### `Test`
+
+Check for an arbitrary node (TypeScript type).
+
+###### Type
+
+```ts
+type Test =
+  | Array<Record<string, unknown> | TestFunction | string>
+  | Record<string, unknown>
+  | TestFunction
+  | string
+  | null
+  | undefined
+```
+
+Checks that the given thing is a node, and then:
+
+*   when `string`, checks that the node has that tag name
+*   when `function`, see  [`TestFunction`][api-test-function]
+*   when `object`, checks that all keys in test are in node, and that they have
+    (strictly) equal values
+*   when `Array`, checks if one of the subtests pass
+
+### `TestFunction`
+
+Check if a node passes a test (TypeScript type).
+
+###### Parameters
+
+*   `node` ([`Node`][node])
+    — a node
+*   `index` (`number` or `undefined`)
+    — the node’s position in its parent
+*   `parent` ([`Node`][node] or `undefined`)
+    — the node’s parent
+
+###### Returns
+
+Whether this node passes the test (`boolean`, optional).
+
+## Examples
+
+### Example of `convert`
+
+```js
+import {u} from 'unist-builder'
+import {convert} from 'unist-util-is'
+
+const test = convert('leaf')
+
+const tree = u('tree', [
+  u('node', [u('leaf', '1')]),
+  u('leaf', '2'),
+  u('node', [u('leaf', '3'), u('leaf', '4')]),
+  u('leaf', '5')
+])
+
+const leafs = tree.children.filter(function (child, index) {
+  return test(child, index, tree)
+})
+
+console.log(leafs)
+```
+
+Yields:
+
+```js
+[{type: 'leaf', value: '2'}, {type: 'leaf', value: '5'}]
+```
+
+## Types
+
+This package is fully typed with [TypeScript][].
+It exports the additional types [`Check`][api-check],
+[`Test`][api-test],
+[`TestFunction`][api-test-function].
+
+## Compatibility
+
+Projects maintained by the unified collective are compatible with maintained
+versions of Node.js.
+
+When we cut a new major release, we drop support for unmaintained versions of
+Node.
+This means we try to keep the current release line, `unist-util-is@^6`,
+compatible with Node.js 16.
+
+## Related
+
+*   [`unist-util-find-after`](https://github.com/syntax-tree/unist-util-find-after)
+    — find a node after another node
+*   [`unist-util-find-before`](https://github.com/syntax-tree/unist-util-find-before)
+    — find a node before another node
+*   [`unist-util-find-all-after`](https://github.com/syntax-tree/unist-util-find-all-after)
+    — find all nodes after another node
+*   [`unist-util-find-all-before`](https://github.com/syntax-tree/unist-util-find-all-before)
+    — find all nodes before another node
+*   [`unist-util-find-all-between`](https://github.com/mrzmmr/unist-util-find-all-between)
+    — find all nodes between two nodes
+*   [`unist-util-filter`](https://github.com/syntax-tree/unist-util-filter)
+    — create a new tree with nodes that pass a check
+*   [`unist-util-remove`](https://github.com/syntax-tree/unist-util-remove)
+    — remove nodes from tree
+
+## Contribute
+
+See [`contributing.md`][contributing] in [`syntax-tree/.github`][health] for
+ways to get started.
+See [`support.md`][support] for ways to get help.
+
+This project has a [code of conduct][coc].
+By interacting with this repository, organization, or community you agree to
+abide by its terms.
+
+## License
+
+[MIT][license] © [Titus Wormer][author]
+
+<!-- Definitions -->
+
+[build-badge]: https://github.com/syntax-tree/unist-util-is/workflows/main/badge.svg
+
+[build]: https://github.com/syntax-tree/unist-util-is/actions
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/unist-util-is.svg
+
+[coverage]: https://codecov.io/github/syntax-tree/unist-util-is
+
+[downloads-badge]: https://img.shields.io/npm/dm/unist-util-is.svg
+
+[downloads]: https://www.npmjs.com/package/unist-util-is
+
+[size-badge]: https://img.shields.io/badge/dynamic/json?label=minzipped%20size&query=$.size.compressedSize&url=https://deno.bundlejs.com/?q=unist-util-is
+
+[size]: https://bundlejs.com/?q=unist-util-is
+
+[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
+
+[backers-badge]: https://opencollective.com/unified/backers/badge.svg
+
+[collective]: https://opencollective.com/unified
+
+[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
+
+[chat]: https://github.com/syntax-tree/unist/discussions
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
+
+[esmsh]: https://esm.sh
+
+[typescript]: https://www.typescriptlang.org
+
+[license]: license
+
+[author]: https://wooorm.com
+
+[health]: https://github.com/syntax-tree/.github
+
+[contributing]: https://github.com/syntax-tree/.github/blob/main/contributing.md
+
+[support]: https://github.com/syntax-tree/.github/blob/main/support.md
+
+[coc]: https://github.com/syntax-tree/.github/blob/main/code-of-conduct.md
+
+[unist]: https://github.com/syntax-tree/unist
+
+[node]: https://github.com/syntax-tree/unist#node
+
+[hast-util-is-element]: https://github.com/syntax-tree/hast-util-is-element
+
+[unist-util-select]: https://github.com/syntax-tree/unist-util-select
+
+[api-convert]: #converttest
+
+[api-is]: #isnode-test-index-parent-context
+
+[api-check]: #check
+
+[api-test]: #test
+
+[api-test-function]: #testfunction