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[support](https://github.com/sponsors/ipikuka) 💖\n\n---\n\n[![npm version][badge-npm-version]][url-npm-package]\n[![npm downloads][badge-npm-download]][url-npm-package]\n[![publish to npm][badge-publish-to-npm]][url-publish-github-actions]\n[![code-coverage][badge-codecov]][url-codecov]\n[![type-coverage][badge-type-coverage]][url-github-package]\n[![typescript][badge-typescript]][url-typescript]\n[![license][badge-license]][url-license]\n\nThis package is a [**unified**][unified] ([**remark**][remark]) plugin **to expose the table of contents via `Vfile.data` or via an option reference in markdown.**\n\n[**unified**][unified] is a project that transforms content with abstract syntax trees (ASTs) using the new parser [**micromark**][micromark]. [**remark**][remark] adds support for markdown to unified. [**mdast**][mdast] is the Markdown Abstract Syntax Tree (AST) which is a specification for representing markdown in a syntax tree.\n\n**This plugin is a remark plugin that doesn't transform the MDAST but gets info from the MDAST.**\n\n## When should I use this?\n\n**`remark-flexible-toc`** is useful if you want to get the table of contents (TOC) from the markdown/MDX document. It exposes the table of contents (TOC) in two ways:\n+ by adding a `toc` object into `Vfile.data`\n+ by mutating a reference array if provided in the options\n\n## Installation\n\nThis package is suitable for ESM only. In Node.js (version 16+), install with npm:\n\n```bash\nnpm install remark-flexible-toc\n```\n\nor\n\n```bash\nyarn add remark-flexible-toc\n```\n\n## Usage\n\nSay we have the following file, `example.md`, which consists some headings.\n\n```markdown\n# The Main Heading\n\n## Section\n\n### Subheading 1\n\n### Subheading 2\n```\n\nSay `example.js` looks as followings *(two ways):*\n\n#### The first way of getting TOC via file.data\n\n```javascript\nimport { read } from \"to-vfile\";\nimport remark from \"remark\";\nimport gfm from \"remark-gfm\";\nimport remarkRehype from \"remark-rehype\";\nimport rehypeStringify from \"rehype-stringify\";\nimport remarkFlexibleToc from \"remark-flexible-toc\";\n\nmain();\n\nasync function main() {\n const file = await remark()\n .use(gfm)\n .use(remarkFlexibleToc)\n .use(remarkRehype)\n .use(rehypeStringify)\n .process(await read(\"example.md\"));\n\n console.log(file.data.toc);\n}\n```\n\n#### The second way of getting TOC via a reference array in the options\n\n```javascript\nimport { read } from \"to-vfile\";\nimport remark from \"remark\";\nimport gfm from \"remark-gfm\";\nimport remarkRehype from \"remark-rehype\";\nimport rehypeStringify from \"rehype-stringify\";\nimport remarkFlexibleToc from \"remark-flexible-toc\";\n\nmain();\n\nasync function main() {\n const toc = [];\n\n const file = await remark()\n .use(gfm)\n .use(remarkFlexibleToc, {tocRef: toc})\n .use(remarkRehype)\n .use(rehypeStringify)\n .process(await read(\"example.md\"));\n\n console.log(toc);\n}\n```\n\nNow, running both `node example.js` you will see that the same table of contents (TOC) is logged in the console:\n\n```javascript\n[\n {\n depth: 2,\n href: \"#section\",\n numbering: [1, 1],\n parent: \"root\",\n value: \"Section\",\n },\n {\n depth: 3,\n href: \"#subheading-1\",\n numbering: [1, 1, 1],\n parent: \"root\",\n value: \"Subheading 1\",\n },\n {\n depth: 3,\n href: \"#subheading-2\",\n numbering: [1, 1, 2],\n parent: \"root\",\n value: \"Subheading 2\",\n },\n]\n```\n\nWithout **`remark-flexible-toc`**, there wouldn't be any `toc` key in the `file.data`:\n\n## Options\n\nAll options are **optional**.\n\n```typescript\ntype HeadingParent =\n | \"root\"\n | \"blockquote\"\n | \"footnoteDefinition\"\n | \"listItem\"\n | \"container\"\n | \"mdxJsxFlowElement\";\n\ntype HeadingDepth = 1 | 2 | 3 | 4 | 5 | 6;\n\nuse(remarkFlexibleToc, {\n tocName?: string; // default: \"toc\"\n tocRef?: TocItem[]; // default: []\n maxDepth?: HeadingDepth; // default: 6\n skipLevels?: HeadingDepth[]; // default: [1]\n skipParents?: Exclude[]; // default: []\n exclude?: string | string[];\n prefix?: string;\n callback?: (toc: TocItem[]) => undefined;\n} as FlexibleTocOptions);\n```\n\n#### `tocName`\n\nIt is a **string** option in which the table of contents (TOC) is placed in the `vfile.data`. \n\nBy default it is **`toc`**, meaningly the TOC is reachable via `vfile.data.toc`.\n\n```javascript\nuse(remarkFlexibleToc, {\n tocName: \"headings\";\n});\n```\nNow, the TOC is accessable via `vfile.data.headings`.\n\n#### `tocRef`\n\nIt is an **array of reference** option for getting the table of contents (TOC), which is the second way of getting the TOC from **`remark-flexible-toc`**.\n\nThe reference array should be an empty array, if not, it is emptied by the plugin.\n\nIf you use _typescript_, the array reference should be `const toc: TocItem[] = []`.\n\n```javascript\nconst toc = [];\n\nuse(remarkFlexibleToc, {\n tocRef: toc; // `remark-flexible-toc` mutates the array of reference\n});\n```\n\nNow, the TOC is accessable via `toc`.\n\n#### `maxDepth`\n\nIt is a **number** option for indicating the max heading depth to include in the TOC.\n\nBy default it is `6`. Meaningly, there is no restriction by default.\n\n```javascript\nuse(remarkFlexibleToc, {\n maxDepth: 4;\n});\n```\n\nThe `maxDepth` option is inclusive: when set to 4, level fourth headings are included, but fifth and sixth level headings will be skipped.\n\n#### `skipLevels` \n\nIt is an **array** option to indicate the heading levels to be skipped. \n\nBy default it is `[1]` since the first level heading is not expected to be in the TOC.\n\n```javascript\nuse(remarkFlexibleToc, {\n skipLevels: [1, 2, 4, 5, 6];\n});\n```\n\nNow, the TOC consists only the third level headings.\n\n#### `skipParents`\n\nBy default it is an empty array `[]`. The array may contain the parent values `blockquote`, `footnoteDefinition`, `listItem`, `container`, `mdxJsxFlowElement`.\n\n```javascript\nuse(remarkFlexibleToc, {\n skipParents: [\"blockquote\"];\n});\n```\n\nNow, the headings in the `
` will not be added into the TOC.\n\n#### `exclude`\n\nIt is a **string** or **string[]** option. The plugin wraps the string(s) in new RegExp('^(' + value + ')$', 'i'), so any heading matching this expression will not be present in the TOC. The RegExp checks exact (not contain) matching and case insensitive as you see.\n\nThe option has no default value.\n\n```javascript\nuse(remarkFlexibleToc, {\n exclude: \"The Subheading\";\n});\n```\nNow, the heading \"The Subheading\" will not be included in to the TOC, but forexample \"The Subheading Something\" will be included.\n\n#### `prefix`\n\nIt is a **string** option to add a prefix to `href`s of the TOC items. It is useful for example when later going from markdown to HTML and sanitizing with `rehype-sanitize`.\n\nThe option has no default value.\n\n```javascript\nuse(remarkFlexibleToc, {\n prefix: \"text-prefix-\";\n});\n```\nNow, all TOC items' `href`s will start with that prefix like `#text-prefix-the-subheading`.\n\n#### `callback`\n\nIt is a **callback function** `callback?: (toc: TocItem[]) => undefined;` which takes the TOC items as an argument and returns nothing. It is usefull for logging the TOC, forexample, or modifing the TOC. **It is allowed that the callback function is able to mutate the TOC items !**\n\nThe option has no default value.\n\n```javascript\nuse(remarkFlexibleToc, {\n callback: (toc) => {\n console.log(toc);\n };\n});\n```\n\nNow, each time when you compile the source, the TOC will be logged into the console for debugging purpose.\n\n## A Table of Content (TOC) Item\n\n```typescript\ntype TocItem = {\n value: string; // heading text\n href: string; // produced uniquely by \"github-slugger\" using the value of the heading\n depth: HeadingDepth; // 1 | 2 | 3 | 4 | 5 | 6\n numbering: number[]; // explained below\n parent: HeadingParent; // \"root\"| \"blockquote\" | \"footnoteDefinition\" | \"listItem\" | \"container\" | \"mdxJsxFlowElement\"\n data?: Record; // Other remark plugins may store custom data in \"node.data.hProperties\" like \"id\" etc.\n};\n```\n\n> [!NOTE]\n> If there is a remark plugin before **`remark-flexible-toc`** in the plugin chain like **`remark-heading-id`** or **`remark-custom-header-id`**, which provides custom id for headings, that custom id takes precedence for `href`.\n\n**`remark-flexible-toc`** uses **`github-slugger`** internally for producing unique links. Then, it is possible you to use [**rehype-slug**][rehype-slug] (forIDs on headings) and [**rehype-autolink-headings**][rehype-autolink-headings] (for anchors that link-to-self) because they use the same **`github-slugger`**.\n\nAs an example for the unique heading links (notice the same heading texts).\n\n```markdown\n# The Main Heading\n\n## Section\n\n### Subheading\n\n## Section\n \n### Subheading\n```\n\nThe `github-slugger` produces unique links with using a counter mechanism internally, and the TOC item's `href`s is going to be unique.\n\n```javascript\n[\n {\n depth: 2,\n href: \"#section\",\n numbering: [1, 1],\n parent: \"root\",\n value: \"Section\",\n },\n {\n depth: 3,\n href: \"#subheading\",\n numbering: [1, 1, 1],\n parent: \"root\",\n value: \"Subheading\",\n },\n {\n depth: 2,\n href: \"#section-1\",\n numbering: [1, 2],\n parent: \"root\",\n value: \"Section\",\n },\n {\n depth: 3,\n href: \"#subheading-1\",\n numbering: [1, 2, 1],\n parent: \"root\",\n value: \"Subheading\",\n },\n]\n```\n\n## Numbering for Ordered Table of Contents (TOC)\n\n**`remark-flexible-toc`** produces always the `numbering` for TOC items in case you show the ordered TOC.\n\nThe **numbering** of a TOC item is an array of number. The numbers in the `numbering` corresponds the **level of the headers**. With that structure, you know which header is under which header.\n\n```js\n[1, 1]\n[1, 2]\n[1, 2, 1]\n[1, 2, 2]\n[1, 3]\n```\n\nThe first number of the `numbering` is related with the fist level headings.\nThe second number of the `numbering` is related with the second level headings.\nAnd so on...\n\nIf yo haven't included the first level header into the TOC, you can slice the `numbering` with `1` so as to second level headings starts with `1` and so on..\n\n```javascript\ntocItem.numbering.slice(1);\n```\n\nYou can join the `numbering` as you wish. It is up to you to combine the `numbering` with dot, or dash.\n\n```javascript\ntocItem.numbering.join(\".\");\ntocItem.numbering.join(\"-\");\n```\n\n## Syntax tree\n\nThis plugin does not modify the `mdast` (markdown abstract syntax tree), collects data from the `mdast` and adds information into the `vfile.data` if required.\n\n## Types\n\nThis package is fully typed with [TypeScript][url-typescript]. The plugin exports the types `FlexibleTocOptions`, `HeadingParent`, `HeadingDepth`, `TocItem`.\n\n## Compatibility\n\nThis plugin works with `unified` version 6+ and `remark` version 7+. It is compatible with `mdx` version 2+.\n\n## Security\n\nUse of **`remark-flexible-toc`** does not involve rehype (hast) or user content so there are no openings for cross-site scripting (XSS) attacks.\n\n## My Plugins\n\nI like to contribute the Unified / Remark / MDX ecosystem, so I recommend you to have a look my plugins.\n\n### Support My Work ([become a sponsor](https://github.com/sponsors/ipikuka) 🚀)\n\nIf you find **`remark-flexible-toc`** or any of my projects is useful and helpful, please consider supporting my work. Your sponsorship means a lot to me and keeps these projects alive and updated! 💖\n\nMy sponsors are going to be featured at the very top of the page and proudly displayed on my [Sponsor Wall](https://github.com/sponsors/ipikuka).\n\nThank you for supporting open source! 🙌\n\n### My Remark Plugins\n\n- [`remark-flexible-code-titles`](https://www.npmjs.com/package/remark-flexible-code-titles)\n – Remark plugin to add titles or/and containers for the code blocks with customizable properties\n- [`remark-flexible-containers`](https://www.npmjs.com/package/remark-flexible-containers)\n – Remark plugin to add custom containers with customizable properties in markdown\n- [`remark-ins`](https://www.npmjs.com/package/remark-ins)\n – Remark plugin to add `ins` element in markdown\n- [`remark-flexible-paragraphs`](https://www.npmjs.com/package/remark-flexible-paragraphs)\n – Remark plugin to add custom paragraphs with customizable properties in markdown\n- [`remark-flexible-markers`](https://www.npmjs.com/package/remark-flexible-markers)\n – Remark plugin to add custom `mark` element with customizable properties in markdown\n- [`remark-flexible-toc`](https://www.npmjs.com/package/remark-flexible-toc)\n – Remark plugin to expose the table of contents via `vfile.data` or via an option reference\n- [`remark-mdx-remove-esm`](https://www.npmjs.com/package/remark-mdx-remove-esm)\n – Remark plugin to remove import and/or export statements (mdxjsEsm)\n- [`remark-mdx-remove-expressions`](https://www.npmjs.com/package/remark-mdx-remove-expressions)\n – Remark plugin to remove MDX expressions within curlybraces {} in MDX content\n\n### My Rehype Plugins\n\n- [`rehype-pre-language`](https://www.npmjs.com/package/rehype-pre-language)\n – Rehype plugin to add language information as a property to `pre` element\n- [`rehype-highlight-code-lines`](https://www.npmjs.com/package/rehype-highlight-code-lines)\n – Rehype plugin to add line numbers to code blocks and allow highlighting of desired code lines\n- [`rehype-code-meta`](https://www.npmjs.com/package/rehype-code-meta)\n – Rehype plugin to copy `code.data.meta` to `code.properties.metastring`\n- [`rehype-image-toolkit`](https://www.npmjs.com/package/rehype-image-toolkit)\n – Rehype plugin to enhance Markdown image syntax `![]()` and Markdown/MDX media elements (``, `