feat: import markdown-it-plugins from https://github.com/hedgedoc/markdown-it-plugins

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
2024-11-21 09:16:30 -05:00 · 2023-08-26 14:54:15 +02:00 · 2023-08-26 14:54:15 +02:00 · f5736dad0f
commit f5736dad0f
parent 1d90013344
37 changed files with 2025 additions and 0 deletions
--- a/markdown-it-plugins/.editorconfig
+++ b/markdown-it-plugins/.editorconfig
@ -0,0 +1,208 @@
+# SPDX-FileCopyrightText: 2020 The HedgeDoc developers (see AUTHORS file)
+#
+# SPDX-License-Identifier: CC0-1.0
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+tab_width = 4
+trim_trailing_whitespace = true
+ij_continuation_indent_size = 8
+ij_formatter_off_tag = @formatter:off
+ij_formatter_on_tag = @formatter:on
+ij_formatter_tags_enabled = false
+ij_smart_tabs = false
+ij_wrap_on_typing = false
+
+[{*.ats,*.ts,*.tsx}]
+indent_size = 2
+tab_width = 2
+ij_continuation_indent_size = 2
+ij_typescript_align_imports = false
+ij_typescript_align_multiline_array_initializer_expression = false
+ij_typescript_align_multiline_binary_operation = false
+ij_typescript_align_multiline_chained_methods = false
+ij_typescript_align_multiline_extends_list = false
+ij_typescript_align_multiline_for = true
+ij_typescript_align_multiline_parameters = true
+ij_typescript_align_multiline_parameters_in_calls = false
+ij_typescript_align_multiline_ternary_operation = false
+ij_typescript_align_object_properties = 0
+ij_typescript_align_union_types = false
+ij_typescript_align_var_statements = 0
+ij_typescript_array_initializer_new_line_after_left_brace = false
+ij_typescript_array_initializer_right_brace_on_new_line = false
+ij_typescript_array_initializer_wrap = off
+ij_typescript_assignment_wrap = off
+ij_typescript_binary_operation_sign_on_next_line = false
+ij_typescript_binary_operation_wrap = off
+ij_typescript_blacklist_imports = rxjs/Rx,node_modules/**,**/node_modules/**,@angular/material,@angular/material/typings/**
+ij_typescript_blank_lines_after_imports = 1
+ij_typescript_blank_lines_around_class = 1
+ij_typescript_blank_lines_around_field = 0
+ij_typescript_blank_lines_around_field_in_interface = 0
+ij_typescript_blank_lines_around_function = 1
+ij_typescript_blank_lines_around_method = 1
+ij_typescript_blank_lines_around_method_in_interface = 1
+ij_typescript_block_brace_style = end_of_line
+ij_typescript_call_parameters_new_line_after_left_paren = false
+ij_typescript_call_parameters_right_paren_on_new_line = false
+ij_typescript_call_parameters_wrap = off
+ij_typescript_catch_on_new_line = false
+ij_typescript_chained_call_dot_on_new_line = true
+ij_typescript_class_brace_style = end_of_line
+ij_typescript_comma_on_new_line = false
+ij_typescript_do_while_brace_force = never
+ij_typescript_else_on_new_line = false
+ij_typescript_enforce_trailing_comma = keep
+ij_typescript_extends_keyword_wrap = off
+ij_typescript_extends_list_wrap = off
+ij_typescript_field_prefix = _
+ij_typescript_file_name_style = relaxed
+ij_typescript_finally_on_new_line = false
+ij_typescript_for_brace_force = never
+ij_typescript_for_statement_new_line_after_left_paren = false
+ij_typescript_for_statement_right_paren_on_new_line = false
+ij_typescript_for_statement_wrap = off
+ij_typescript_force_quote_style = false
+ij_typescript_force_semicolon_style = true
+ij_typescript_function_expression_brace_style = end_of_line
+ij_typescript_if_brace_force = never
+ij_typescript_import_merge_members = global
+ij_typescript_import_prefer_absolute_path = global
+ij_typescript_import_sort_members = true
+ij_typescript_import_sort_module_name = true
+ij_typescript_import_use_node_resolution = true
+ij_typescript_imports_wrap = on_every_item
+ij_typescript_indent_case_from_switch = true
+ij_typescript_indent_chained_calls = false
+ij_typescript_indent_package_children = 0
+ij_typescript_jsdoc_include_types = false
+ij_typescript_jsx_attribute_value = braces
+ij_typescript_keep_blank_lines_in_code = 1
+ij_typescript_keep_first_column_comment = true
+ij_typescript_keep_indents_on_empty_lines = false
+ij_typescript_keep_line_breaks = true
+ij_typescript_keep_simple_blocks_in_one_line = false
+ij_typescript_keep_simple_methods_in_one_line = false
+ij_typescript_line_comment_add_space = true
+ij_typescript_line_comment_at_first_column = false
+ij_typescript_method_brace_style = end_of_line
+ij_typescript_method_call_chain_wrap = off
+ij_typescript_method_parameters_new_line_after_left_paren = false
+ij_typescript_method_parameters_right_paren_on_new_line = false
+ij_typescript_method_parameters_wrap = off
+ij_typescript_object_literal_wrap = on_every_item
+ij_typescript_parentheses_expression_new_line_after_left_paren = false
+ij_typescript_parentheses_expression_right_paren_on_new_line = false
+ij_typescript_place_assignment_sign_on_next_line = false
+ij_typescript_prefer_as_type_cast = false
+ij_typescript_prefer_explicit_types_function_expression_returns = false
+ij_typescript_prefer_explicit_types_function_returns = false
+ij_typescript_prefer_explicit_types_vars_fields = false
+ij_typescript_prefer_parameters_wrap = false
+ij_typescript_reformat_c_style_comments = false
+ij_typescript_space_after_colon = true
+ij_typescript_space_after_comma = true
+ij_typescript_space_after_dots_in_rest_parameter = false
+ij_typescript_space_after_generator_mult = true
+ij_typescript_space_after_property_colon = true
+ij_typescript_space_after_quest = true
+ij_typescript_space_after_type_colon = true
+ij_typescript_space_after_unary_not = false
+ij_typescript_space_before_async_arrow_lparen = true
+ij_typescript_space_before_catch_keyword = true
+ij_typescript_space_before_catch_left_brace = true
+ij_typescript_space_before_catch_parentheses = true
+ij_typescript_space_before_class_lbrace = true
+ij_typescript_space_before_class_left_brace = true
+ij_typescript_space_before_colon = true
+ij_typescript_space_before_comma = false
+ij_typescript_space_before_do_left_brace = true
+ij_typescript_space_before_else_keyword = true
+ij_typescript_space_before_else_left_brace = true
+ij_typescript_space_before_finally_keyword = true
+ij_typescript_space_before_finally_left_brace = true
+ij_typescript_space_before_for_left_brace = true
+ij_typescript_space_before_for_parentheses = true
+ij_typescript_space_before_for_semicolon = false
+ij_typescript_space_before_function_left_parenth = true
+ij_typescript_space_before_generator_mult = false
+ij_typescript_space_before_if_left_brace = true
+ij_typescript_space_before_if_parentheses = true
+ij_typescript_space_before_method_call_parentheses = false
+ij_typescript_space_before_method_left_brace = true
+ij_typescript_space_before_method_parentheses = true
+ij_typescript_space_before_property_colon = false
+ij_typescript_space_before_quest = true
+ij_typescript_space_before_switch_left_brace = true
+ij_typescript_space_before_switch_parentheses = true
+ij_typescript_space_before_try_left_brace = true
+ij_typescript_space_before_type_colon = false
+ij_typescript_space_before_unary_not = false
+ij_typescript_space_before_while_keyword = true
+ij_typescript_space_before_while_left_brace = true
+ij_typescript_space_before_while_parentheses = true
+ij_typescript_spaces_around_additive_operators = true
+ij_typescript_spaces_around_arrow_function_operator = true
+ij_typescript_spaces_around_assignment_operators = true
+ij_typescript_spaces_around_bitwise_operators = true
+ij_typescript_spaces_around_equality_operators = true
+ij_typescript_spaces_around_logical_operators = true
+ij_typescript_spaces_around_multiplicative_operators = true
+ij_typescript_spaces_around_relational_operators = true
+ij_typescript_spaces_around_shift_operators = true
+ij_typescript_spaces_around_unary_operator = false
+ij_typescript_spaces_within_array_initializer_brackets = false
+ij_typescript_spaces_within_brackets = false
+ij_typescript_spaces_within_catch_parentheses = false
+ij_typescript_spaces_within_for_parentheses = false
+ij_typescript_spaces_within_if_parentheses = false
+ij_typescript_spaces_within_imports = true
+ij_typescript_spaces_within_interpolation_expressions = false
+ij_typescript_spaces_within_method_call_parentheses = false
+ij_typescript_spaces_within_method_parentheses = false
+ij_typescript_spaces_within_object_literal_braces = true
+ij_typescript_spaces_within_object_type_braces = true
+ij_typescript_spaces_within_parentheses = false
+ij_typescript_spaces_within_switch_parentheses = false
+ij_typescript_spaces_within_type_assertion = false
+ij_typescript_spaces_within_union_types = true
+ij_typescript_spaces_within_while_parentheses = false
+ij_typescript_special_else_if_treatment = true
+ij_typescript_ternary_operation_signs_on_next_line = false
+ij_typescript_ternary_operation_wrap = off
+ij_typescript_union_types_wrap = on_every_item
+ij_typescript_use_chained_calls_group_indents = false
+ij_typescript_use_double_quotes = false
+ij_typescript_use_explicit_js_extension = global
+ij_typescript_use_path_mapping = always
+ij_typescript_use_public_modifier = false
+ij_typescript_use_semicolon_after_statement = false
+ij_typescript_var_declaration_wrap = normal
+ij_typescript_while_brace_force = never
+ij_typescript_while_on_new_line = false
+ij_typescript_wrap_comments = false
+
+[{*.har,*.jsb2,*.jsb3,*.json,.babelrc,.eslintrc,.prettierrc,.stylelintrc,bowerrc,jest.config}]
+indent_size = 2
+ij_json_keep_blank_lines_in_code = 0
+ij_json_keep_indents_on_empty_lines = false
+ij_json_keep_line_breaks = true
+ij_json_space_after_colon = true
+ij_json_space_after_comma = true
+ij_json_space_before_colon = true
+ij_json_space_before_comma = false
+ij_json_spaces_within_braces = false
+ij_json_spaces_within_brackets = false
+ij_json_wrap_long_lines = false
+
+[{*.yaml,*.yml}]
+indent_size = 2
+ij_yaml_keep_indents_on_empty_lines = false
+ij_yaml_keep_line_breaks = true
+
--- a/markdown-it-plugins/.eslintrc.json
+++ b/markdown-it-plugins/.eslintrc.json
@ -0,0 +1,36 @@
+/*
+ * SPDX-FileCopyrightText: 2020 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */
+{
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "project": [
+      "./tsconfig.test.json"
+    ]
+  },
+  "plugins": [
+    "@typescript-eslint",
+    "jest",
+    "prettier"
+  ],
+  "env": {
+    "jest": true,
+    "jest/globals": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+  ],
+  "rules": {
+    "prettier/prettier": "error",
+    "jest/no-disabled-tests": "warn",
+    "jest/no-focused-tests": "error",
+    "jest/no-identical-title": "error",
+    "jest/prefer-to-have-length": "warn",
+    "jest/valid-expect": "error"
+  }
+}
--- a/markdown-it-plugins/.gitignore
+++ b/markdown-it-plugins/.gitignore
@ -0,0 +1 @@
+dist/
--- a/markdown-it-plugins/.prettierrc.json
+++ b/markdown-it-plugins/.prettierrc.json
@ -0,0 +1,11 @@
+{
+  "parser": "typescript",
+  "singleQuote": true,
+  "jsxSingleQuote": true,
+  "semi": false,
+  "tabWidth": 2,
+  "trailingComma": "none",
+  "bracketSpacing": true,
+  "bracketSameLine": true,
+  "arrowParens": "always"
+}
--- a/markdown-it-plugins/.prettierrc.json.license
+++ b/markdown-it-plugins/.prettierrc.json.license
@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+
+SPDX-License-Identifier: CC0-1.0
--- a/markdown-it-plugins/.renovaterc.json
+++ b/markdown-it-plugins/.renovaterc.json
@ -0,0 +1,49 @@
+{
+  "extends": [
+    "config:base",
+    ":gitSignOff",
+    ":preserveSemverRanges",
+    ":prHourlyLimitNone",
+    ":dependencyDashboard",
+    ":maintainLockFilesWeekly"
+  ],
+  "prHourlyLimit": 0,
+  "schedule": [
+    "on Saturday"
+  ],
+  "labels": [
+    "dependencies"
+  ],
+  "packageRules": [
+    {
+      "extends": "packages:linters",
+      "groupName": "linters"
+    },
+    {
+      "extends": "monorepo:typescript-eslint",
+      "groupName": "typescript-eslint monorepo"
+    },
+    {
+      "extends": "monorepo:react",
+      "groupName": "react monorepo"
+    },
+    {
+      "extends": "monorepo:reactrouter",
+      "groupName": "reactrouter monorepo"
+    },
+    {
+      "groupName": "definitelyTyped",
+      "matchPackagePatterns": [
+        "^@types/"
+      ]
+    },
+    {
+      "groupName": "Jest",
+      "matchPackageNames": [
+        "jest",
+        "ts-jest",
+        "@types/jest"
+      ]
+    }
+  ]
+}
--- a/markdown-it-plugins/.renovaterc.json.license
+++ b/markdown-it-plugins/.renovaterc.json.license
@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2020 The HedgeDoc developers (see AUTHORS file)
+
+SPDX-License-Identifier: CC0-1.0
--- a/markdown-it-plugins/LICENSE
+++ b/markdown-it-plugins/LICENSE
@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 The HedgeDoc developers (see AUTHORS file)
+
+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.
--- a/markdown-it-plugins/README.md
+++ b/markdown-it-plugins/README.md
@ -0,0 +1,143 @@
+<!--
+SPDX-FileCopyrightText: 2020 The HedgeDoc developers (see AUTHORS file)
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
+# Markdown-It plugins
+
+This repository contains plugins for [Markdown-It](https://github.com/markdown-it/markdown-it) that are used by HedgeDoc.
+All these plugins are (re)created in typescript.
+
+## License
+Everything is licensed under MIT
+
+## Usage
+Install the lib using `yarn install @hedgedoc/markdown-it-plugins` or `npm i @hedgedoc/markdown-it-plugins`
+
+## Development
+If you want to contribute to this lib then:
+- Clone this repository
+- Install the dependencies using `yarn install`. Don't use `npm`!
+- Make your changes
+- Make sure that your changes are covered by tests. Use `yarn test` to run all tests
+- Make sure that your code follows the code style. Use `yarn lint` to check the style
+- Commit your changes (please use [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/)) and create a pull request
+
+## markdown-it-image-size
+A markdown-it plugin for size-specified image markups. This plugin overloads the original image renderer of markdown-it.
+> This is a typescript port of https://github.com/tatsy/markdown-it-imsize without the local file system support.
+
+### Usage
+
+#### Enable plugin
+
+```ts
+import MarkdownIt from 'markdown-it'
+import { imageSize } from '@hedgedoc/markdown-it-plugins'
+
+const md = new MarkdownIt({
+    html: true,
+    linkify: true,
+    typography: true
+}).use(imageSize);
+```
+
+#### Example
+
+```md
+![test](image.png =100x200)
+```
+
+is interpreted as
+
+```html
+<p><img src="image.png" alt="test" width="100" height="200"></p>
+```
+
+## markdown-it-better-task-lists
+
+A markdown-it plugin that renders GitHub-style task-lists. It builds [task/todo lists](https://github.com/blog/1825-task-lists-in-all-markdown-documents) out of Markdown lists with items starting with `[ ]` or `[x]`.
+
+This is a typescript port of [markdown-it-task-lists](https://github.com/revin/markdown-it-task-lists).
+
+### Why is this useful?
+
+When you have markdown documentation with checklists, rendering HTML checkboxes
+out of the list items looks nicer than the raw square brackets.
+
+### Usage
+
+Use it the same as a normal markdown-it plugin:
+
+```ts
+import MarkdownIt from 'markdown-it'
+import { taskLists } from '@hedgedoc/markdown-it-plugins'
+
+const parser = new MarkdownIt().use(taskLists)
+
+const result = parser.render(`
+- [ ] Open task
+- [x] Done task
+- Not a task
+`) // markdown string containing task list items
+```
+
+The rendered checkboxes are disabled; to change this, set `enabled` property of the
+plugin options to `true`:
+
+```ts
+const parser = new MarkdownIt().use(taskLists, { enabled: true })
+```
+
+If you need to know which line in the markdown document the generated checkbox comes
+set the `lineNumber` property of the plugin options to `true` for the
+`<input>` tag to be created with a data-line attribute containing the line number:
+
+```ts
+const parser = new MarkdownIt().use(taskLists, { lineNumber: true })
+```
+
+If you'd like to wrap the rendered list items in a `<label>` element for UX
+purposes, set the `label` property of the plugin options to `true`:
+
+```ts
+const parser = new MarkdownIt().use(taskLists, { label: true })
+```
+
+To add the label after the checkbox set the `labelAfter` property of the plugin
+options to `true`:
+
+```ts
+const parser = new MarkdownIt().use(taskLists, { label: true, labelAfter: true })
+```
+
+**Note:** This option does require the `label` option to be truthy.
+
+The options can be combined, of course.
+
+## markdown-it-toc
+
+A markdown-it plugin that renders a table of contents.
+It uses the found headlines as content.
+
+This is a typescript port of [markdown-it-toc-done-right](https://github.com/nagaozen/markdown-it-toc-done-right).
+
+### Usage
+
+Use it the same as a normal markdown-it plugin:
+
+```ts
+import MarkdownIt from 'markdown-it'
+import { toc } from '@hedgedoc/markdown-it-plugins'
+
+const parser = new MarkdownIt().use(toc)
+
+const result = parser.render(`
+[toc]
+
+# head 1
+
+# head 2
+`) // markdown string containing task list items
+```
--- a/markdown-it-plugins/build.sh
+++ b/markdown-it-plugins/build.sh
@ -0,0 +1,34 @@
+#!/bin/bash
+#
+# SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+#
+# SPDX-License-Identifier: MIT
+#
+
+
+set -e
+
+echo "Clear dist directory.."
+rm -rf dist
+
+echo "Compile to CJS.."
+tsc --project tsconfig.cjs.json
+
+echo "Compile to ESM.."
+tsc --project tsconfig.esm.json
+
+echo "Fix CJS package.json.."
+cat > dist/cjs/package.json <<!EOF
+{
+    "type": "commonjs"
+}
+!EOF
+
+echo "Fix ESM package.json.."
+cat > dist/esm/package.json <<!EOF
+{
+    "type": "module"
+}
+!EOF
+
+echo "Done!"
--- a/markdown-it-plugins/jest.config.json
+++ b/markdown-it-plugins/jest.config.json
@ -0,0 +1,26 @@
+{
+  "testRegex" : "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
+  "testPathIgnorePatterns" : [
+    "/dist/"
+  ],
+  "moduleFileExtensions" : [
+    "ts",
+    "tsx",
+    "js"
+  ],
+  "extensionsToTreatAsEsm" : [
+    ".ts"
+  ],
+  "moduleNameMapper" : {
+    "^(\\.{1,2}/.*)\\.js$" : "$1"
+  },
+  "transform" : {
+    "^.+\\.tsx?$" : [
+      "ts-jest",
+      {
+        "tsconfig" : "tsconfig.test.json",
+        "useESM" : true
+      }
+    ]
+  }
+}
--- a/markdown-it-plugins/jest.config.json.license
+++ b/markdown-it-plugins/jest.config.json.license
@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+
+SPDX-License-Identifier: CC0-1.0
--- a/markdown-it-plugins/package.json
+++ b/markdown-it-plugins/package.json
@ -0,0 +1,133 @@
+{
+  "name": "@hedgedoc/markdown-it-plugins",
+  "type": "module",
+  "version": "2.1.3",
+  "description": "A collection of used and modified markdown-it plugins.",
+  "source": "src/index.ts",
+  "main": "../dist/cjs/index.js",
+  "types": "dist/cjs/index.d.ts",
+  "module": "../dist/esm/index.js",
+  "exports": {
+    "import": {
+      "types": "./dist/esm/index.d.ts",
+      "default": "./dist/esm/index.js"
+    },
+    "require": {
+      "types": "./dist/cjs/index.d.ts",
+      "default": "./dist/cjs/index.js"
+    }
+  },
+  "files": [
+    "LICENSES/*",
+    "package.json",
+    "README.md",
+    "dist/cjs/image-size/index.d.ts",
+    "dist/cjs/image-size/index.js",
+    "dist/cjs/image-size/index.js.map",
+    "dist/cjs/image-size/parse-image-size.d.ts",
+    "dist/cjs/image-size/parse-image-size.js",
+    "dist/cjs/image-size/parse-image-size.js.map",
+    "dist/cjs/image-size/specialCharacters.d.ts",
+    "dist/cjs/image-size/specialCharacters.js",
+    "dist/cjs/image-size/specialCharacters.js.map",
+    "dist/cjs/index.d.ts",
+    "dist/cjs/index.js",
+    "dist/cjs/index.js.map",
+    "dist/cjs/package.json",
+    "dist/cjs/task-lists/index.d.ts",
+    "dist/cjs/task-lists/index.js",
+    "dist/cjs/task-lists/index.js.map",
+    "dist/cjs/toc/index.d.ts",
+    "dist/cjs/toc/index.js",
+    "dist/cjs/toc/index.js.map",
+    "dist/cjs/toc/plugin.d.ts",
+    "dist/cjs/toc/plugin.js",
+    "dist/cjs/toc/plugin.js.map",
+    "dist/cjs/toc/toc-ast.d.ts",
+    "dist/cjs/toc/toc-ast.js",
+    "dist/cjs/toc/toc-ast.js.map",
+    "dist/cjs/toc/toc-body-renderer.d.ts",
+    "dist/cjs/toc/toc-body-renderer.js",
+    "dist/cjs/toc/toc-body-renderer.js.map",
+    "dist/cjs/toc/toc-options.d.ts",
+    "dist/cjs/toc/toc-options.js",
+    "dist/cjs/toc/toc-options.js.map",
+    "dist/esm/image-size/index.d.ts",
+    "dist/esm/image-size/index.js",
+    "dist/esm/image-size/index.js.map",
+    "dist/esm/image-size/parse-image-size.d.ts",
+    "dist/esm/image-size/parse-image-size.js",
+    "dist/esm/image-size/parse-image-size.js.map",
+    "dist/esm/image-size/specialCharacters.d.ts",
+    "dist/esm/image-size/specialCharacters.js",
+    "dist/esm/image-size/specialCharacters.js.map",
+    "dist/esm/index.d.ts",
+    "dist/esm/index.js",
+    "dist/esm/index.js.map",
+    "dist/esm/package.json",
+    "dist/esm/task-lists/index.d.ts",
+    "dist/esm/task-lists/index.js",
+    "dist/esm/task-lists/index.js.map",
+    "dist/esm/toc/index.d.ts",
+    "dist/esm/toc/index.js",
+    "dist/esm/toc/index.js.map",
+    "dist/esm/toc/plugin.d.ts",
+    "dist/esm/toc/plugin.js",
+    "dist/esm/toc/plugin.js.map",
+    "dist/esm/toc/toc-ast.d.ts",
+    "dist/esm/toc/toc-ast.js",
+    "dist/esm/toc/toc-ast.js.map",
+    "dist/esm/toc/toc-body-renderer.d.ts",
+    "dist/esm/toc/toc-body-renderer.js",
+    "dist/esm/toc/toc-body-renderer.js.map",
+    "dist/esm/toc/toc-options.d.ts",
+    "dist/esm/toc/toc-options.js",
+    "dist/esm/toc/toc-options.js.map"
+  ],
+  "scripts": {
+    "test": "../node_modules/.bin/jest",
+    "build": "build.sh",
+    "prepublish": "rm -rf ../dist && yarn lint && yarn build && yarn test",
+    "lint": "../node_modules/.bin/eslint --ext .ts markdown-it-plugins/src",
+    "lint:fix": "../node_modules/.bin/eslint --fix --ext .ts markdown-it-plugins/src"
+  },
+  "keywords": [
+    "markdown",
+    "markdown-it",
+    "image size",
+    "task lists"
+  ],
+  "author": "The HedgeDoc developers",
+  "license": "MIT",
+  "peerDependencies": {
+    "markdown-it": ">=12"
+  },
+  "dependencies": {
+    "@mrdrogdrog/optional": "^1.2.1",
+    "html-entities": "^2.4.0"
+  },
+  "devDependencies": {
+    "@jest/types": "29.6.3",
+    "@types/markdown-it": "13.0.0",
+    "@typescript-eslint/eslint-plugin": "6.4.1",
+    "@typescript-eslint/parser": "6.4.1",
+    "eslint": "8.48.0",
+    "eslint-config-prettier": "9.0.0",
+    "eslint-plugin-jest": "27.2.3",
+    "eslint-plugin-prettier": "5.0.0",
+    "jest": "29.6.4",
+    "markdown-it": "13.0.1",
+    "prettier": "3.0.2",
+    "ts-jest": "29.1.1",
+    "typescript": "5.2.2"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/hedgedoc/markdown-it-plugins.git"
+  },
+  "bugs": {
+    "url": "https://github.com/hedgedoc/markdown-it-plugins/issues"
+  },
+  "homepage": "https://github.com/hedgedoc/markdown-it-plugins#readme",
+  "packageManager": "yarn@3.6.3"
+}
--- a/markdown-it-plugins/package.json.license
+++ b/markdown-it-plugins/package.json.license
@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2020 The HedgeDoc developers (see AUTHORS file)
+
+SPDX-License-Identifier: CC0-1.0
--- a/markdown-it-plugins/src/image-size/index.test.ts
+++ b/markdown-it-plugins/src/image-size/index.test.ts
@ -0,0 +1,56 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import MarkdownIt from 'markdown-it/lib'
+
+import { imageSize } from './index.js'
+import { describe, expect, it } from '@jest/globals'
+
+describe('markdown-it-imsize', function () {
+  const md = new MarkdownIt({
+    html: true,
+    linkify: true,
+    typographer: true
+  }).use(imageSize)
+
+  it('renders a image without size or title', () => {
+    expect(md.renderInline('![test](x)')).toBe('<img src="x" alt="test">')
+  })
+
+  it('renders a image with title', () => {
+    expect(md.renderInline('![test](x "thisisthetitle")')).toBe('<img src="x" alt="test" title="thisisthetitle">')
+  })
+
+  it('renders an image with absolute width and height', () => {
+    expect(md.renderInline('![test](x =100x200)')).toBe('<img src="x" alt="test" width="100" height="200">')
+  })
+
+  it('renders an image with relative width and height', () => {
+    expect(md.renderInline('![test](x =100%x200%)')).toBe('<img src="x" alt="test" width="100%" height="200%">')
+  })
+
+  it('renders an image with title and size', () => {
+    expect(md.renderInline('![test](x "thisisthetitle" =100x200)')).toBe(
+      '<img src="x" alt="test" title="thisisthetitle" width="100" height="200">'
+    )
+  })
+
+  it('renders an image with no size but x', () => {
+    expect(md.renderInline('![test](x "thisisthetitle" =x)')).toBe('<img src="x" alt="test" title="thisisthetitle">')
+  })
+
+  it("doesn't render an image with invalid size syntax", () => {
+    expect(md.renderInline('![test](x "thisisthetitle" =xx)')).toBe('![test](x “thisisthetitle” =xx)')
+  })
+
+  it('renders an image with only width', () => {
+    expect(md.renderInline('![test](x =100x)')).toBe('<img src="x" alt="test" width="100">')
+  })
+
+  it('renders an image with only height', () => {
+    expect(md.renderInline('![test](x =x200)')).toBe('<img src="x" alt="test" height="200">')
+  })
+})
--- a/markdown-it-plugins/src/image-size/index.ts
+++ b/markdown-it-plugins/src/image-size/index.ts
@ -0,0 +1,245 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import MarkdownIt from 'markdown-it'
+import ParserInline from 'markdown-it/lib/parser_inline.js'
+import StateInline from 'markdown-it/lib/rules_inline/state_inline.js'
+import { ParseImageSize, parseImageSize } from './parse-image-size.js'
+import { SpecialCharacters } from './specialCharacters.js'
+
+const checkForImageTagStart = (state: StateInline): boolean => {
+  return (
+    state.src.charCodeAt(state.pos) === SpecialCharacters.EXCLAMATION_MARK &&
+    state.src.charCodeAt(state.pos + 1) === SpecialCharacters.OPENING_BRACKET
+  )
+}
+
+const skipWhiteSpaces = (startPosition: number, state: StateInline): number => {
+  let position = startPosition
+  while (position < state.posMax) {
+    const code = state.src.charCodeAt(position)
+    if (code !== SpecialCharacters.WHITESPACE && code !== SpecialCharacters.NEW_LINE) {
+      break
+    }
+    position += 1
+  }
+  return position
+}
+
+function createImageToken(
+  state: StateInline,
+  labelStartIndex: number,
+  labelEndIndex: number,
+  href: string,
+  title: string,
+  width: string,
+  height: string
+) {
+  state.pos = labelStartIndex
+  state.posMax = labelEndIndex
+
+  const token = state.push('image', 'img', 0)
+  token.children = []
+
+  const newState = new state.md.inline.State(
+    state.src.slice(labelStartIndex, labelEndIndex),
+    state.md,
+    state.env,
+    token.children
+  )
+  newState.md.inline.tokenize(newState)
+
+  token.attrSet('src', href)
+  token.attrSet('alt', '')
+
+  if (title) {
+    token.attrSet('title', title)
+  }
+
+  if (width !== '') {
+    token.attrSet('width', width)
+  }
+
+  if (height !== '') {
+    token.attrSet('height', height)
+  }
+}
+
+function parseSizeParameters(startPosition: number, state: StateInline): ParseImageSize | undefined {
+  // [link](  <href>  "title" =WxH  )
+  //                          ^^^^ parsing image size
+  if (startPosition - 1 < 0) {
+    return
+  }
+  const code = state.src.charCodeAt(startPosition - 1)
+  if (code !== SpecialCharacters.WHITESPACE) {
+    return
+  }
+  const res = parseImageSize(state.src, startPosition, state.posMax)
+  if (!res) {
+    return
+  }
+
+  // [link](  <href>  "title" =WxH  )
+  //                              ^^ skipping these spaces
+  return {
+    position: skipWhiteSpaces(res.position, state),
+    width: res.width,
+    height: res.height
+  }
+}
+
+export interface ParseLinkResult {
+  position: number
+  href: string
+}
+
+// [link](  <href>  "title"  )
+//          ^^^^^^ parsing link destination
+function parseLink(state: StateInline, startPosition: number): ParseLinkResult | undefined {
+  const linkParseResult = state.md.helpers.parseLinkDestination(state.src, startPosition, state.posMax)
+  if (!linkParseResult.ok) {
+    return
+  }
+  const href = state.md.normalizeLink(linkParseResult.str)
+  if (state.md.validateLink(href)) {
+    return { position: linkParseResult.pos, href }
+  } else {
+    return { position: startPosition, href: '' }
+  }
+}
+
+const imageWithSize: ParserInline.RuleInline = (state, silent) => {
+  let position,
+    title,
+    start,
+    href = '',
+    width = '',
+    height = ''
+  const oldPos = state.pos,
+    max = state.posMax
+
+  if (!checkForImageTagStart(state)) {
+    return false
+  }
+
+  const labelStartIndex = state.pos + 2
+  const labelEndIndex = state.md.helpers.parseLinkLabel(state, state.pos + 1, false)
+
+  // parser failed to find ']', so it's not a valid link
+  if (labelEndIndex < 0) {
+    return false
+  }
+
+  position = labelEndIndex + 1
+  if (position < max && state.src.charCodeAt(position) === SpecialCharacters.OPENING_PARENTHESIS) {
+    //
+    // Inline link
+    //
+
+    // [link](  <href>  "title"  )
+    //        ^^ skipping these spaces
+    position += 1
+    position = skipWhiteSpaces(position, state)
+    if (position >= max) {
+      return false
+    }
+
+    const parseLinkResult = parseLink(state, position)
+    if (!parseLinkResult) {
+      return false
+    }
+    position = parseLinkResult.position
+    href = parseLinkResult.href
+
+    // [link](  <href>  "title"  )
+    //                ^^ skipping these spaces
+    start = position
+    position = skipWhiteSpaces(position, state)
+
+    // [link](  <href>  "title"  )
+    //                  ^^^^^^^ parsing link title
+    const parseLinkTitleResult = state.md.helpers.parseLinkTitle(state.src, position, state.posMax)
+    if (position < max && start !== position && parseLinkTitleResult.ok) {
+      title = parseLinkTitleResult.str
+      position = parseLinkTitleResult.pos
+
+      // [link](  <href>  "title"  )
+      //                         ^^ skipping these spaces
+      position = skipWhiteSpaces(position, state)
+    } else {
+      title = ''
+    }
+
+    const parseSizeParametersResult = parseSizeParameters(position, state)
+    if (parseSizeParametersResult) {
+      position = parseSizeParametersResult.position
+      width = parseSizeParametersResult.width
+      height = parseSizeParametersResult.height
+    }
+
+    if (position >= max || state.src.charCodeAt(position) !== SpecialCharacters.CLOSING_PARENTHESIS) {
+      state.pos = oldPos
+      return false
+    }
+    position += 1
+  } else {
+    //
+    // Link reference
+    //
+    if (typeof state.env.references === 'undefined') {
+      return false
+    }
+
+    // [foo]  [bar]
+    //      ^^ optional whitespace (can include newlines)
+    position = skipWhiteSpaces(position, state)
+
+    let label
+
+    if (position < max && state.src.charCodeAt(position) === SpecialCharacters.OPENING_BRACKET) {
+      start = position + 1
+      position = state.md.helpers.parseLinkLabel(state, position)
+      if (position >= 0) {
+        label = state.src.slice(start, (position += 1))
+      } else {
+        position = labelEndIndex + 1
+      }
+    } else {
+      position = labelEndIndex + 1
+    }
+
+    // covers label === '' and label === undefined
+    // (collapsed reference link and shortcut reference link respectively)
+    if (!label) {
+      label = state.src.slice(labelStartIndex, labelEndIndex)
+    }
+
+    const ref = state.env.references[state.md.utils.normalizeReference(label)]
+    if (!ref) {
+      state.pos = oldPos
+      return false
+    }
+    href = ref.href
+    title = ref.title
+  }
+
+  //
+  // We found the end of the link, and know for a fact it's a valid link;
+  // so all that's left to do is to call tokenizer.
+  //
+  if (!silent) {
+    createImageToken(state, labelStartIndex, labelEndIndex, href, title, width, height)
+  }
+
+  state.pos = position
+  state.posMax = max
+  return true
+}
+
+export const imageSize: MarkdownIt.PluginSimple = (md: MarkdownIt) => {
+  md.inline.ruler.before('emphasis', 'image', imageWithSize)
+}
--- a/markdown-it-plugins/src/image-size/parse-image-size.ts
+++ b/markdown-it-plugins/src/image-size/parse-image-size.ts
@ -0,0 +1,98 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import { SpecialCharacters } from './specialCharacters.js'
+
+export interface ParseImageSize {
+  position: number
+  width: string
+  height: string
+}
+
+export interface ParseNextNumber {
+  position: number
+  value: string
+}
+
+function isCharacterADigit(code: number) {
+  return code >= SpecialCharacters.NUMBER_ZERO && code <= SpecialCharacters.NUMBER_NINE
+}
+
+function findNextNotNumberCharacter(startPosition: number, maximalPosition: number, content: string): number {
+  for (let position = startPosition; position < maximalPosition; position += 1) {
+    const code = content.charCodeAt(position)
+    if (!isCharacterADigit(code) && code !== SpecialCharacters.PERCENTAGE) {
+      return position
+    }
+  }
+
+  return maximalPosition
+}
+
+function parseNextNumber(content: string, startPosition: number, maximalPosition: number): ParseNextNumber {
+  const endCharacterIndex = findNextNotNumberCharacter(startPosition, maximalPosition, content)
+
+  return {
+    position: endCharacterIndex,
+    value: content.slice(startPosition, endCharacterIndex)
+  }
+}
+
+/*
+ size must follow = without any white spaces as follows
+ (1) =300x200
+ (2) =300x
+ (3) =x200
+*/
+const checkImageSizeStart = (code: number): boolean => {
+  return (
+    code === SpecialCharacters.LOWER_CASE_X ||
+    (code >= SpecialCharacters.NUMBER_ZERO && code <= SpecialCharacters.NUMBER_NINE)
+  )
+}
+
+export function parseImageSize(
+  imageSize: string,
+  startCharacterPosition: number,
+  maximalCharacterPosition: number
+): ParseImageSize | undefined {
+  if (startCharacterPosition >= maximalCharacterPosition) {
+    return
+  }
+
+  let currentCharacterPosition = startCharacterPosition
+
+  if (imageSize.charCodeAt(currentCharacterPosition) !== SpecialCharacters.EQUALS /* = */) {
+    return
+  }
+
+  currentCharacterPosition += 1
+
+  if (!checkImageSizeStart(imageSize.charCodeAt(currentCharacterPosition))) {
+    return
+  }
+
+  // parse width
+  const width = parseNextNumber(imageSize, currentCharacterPosition, maximalCharacterPosition)
+  currentCharacterPosition = width.position
+
+  // next charactor must be 'x'
+  const code = imageSize.charCodeAt(currentCharacterPosition)
+  if (code !== SpecialCharacters.LOWER_CASE_X /* x */) {
+    return
+  }
+  currentCharacterPosition += 1
+
+  // parse height
+  const height = parseNextNumber(imageSize, currentCharacterPosition, maximalCharacterPosition)
+  currentCharacterPosition = height.position
+
+  return {
+    width: width.value,
+    height: height.value,
+    position: currentCharacterPosition
+  }
+}
--- a/markdown-it-plugins/src/image-size/specialCharacters.ts
+++ b/markdown-it-plugins/src/image-size/specialCharacters.ts
@ -0,0 +1,19 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+export enum SpecialCharacters {
+  EXCLAMATION_MARK = 0x21,
+  OPENING_BRACKET = 0x5b,
+  OPENING_PARENTHESIS = 0x28,
+  WHITESPACE = 0x20,
+  NEW_LINE = 0x0a,
+  EQUALS = 0x3d,
+  LOWER_CASE_X = 0x78,
+  NUMBER_ZERO = 0x30,
+  NUMBER_NINE = 0x39,
+  PERCENTAGE = 0x25,
+  CLOSING_PARENTHESIS = 0x29
+}
--- a/markdown-it-plugins/src/index.ts
+++ b/markdown-it-plugins/src/index.ts
@ -0,0 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+export { imageSize } from './image-size'
+export { taskLists } from './task-lists'
+export * from './toc'
--- a/markdown-it-plugins/src/task-lists/snapshots/index.test.ts.snap
+++ b/markdown-it-plugins/src/task-lists/snapshots/index.test.ts.snap
@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+exports[`markdown-it-task-lists renders bullet correctly 1`] = `
+"<ul class="contains-task-list">
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-1" />unchecked item 1</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-2" />unchecked item 2</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-3" />unchecked item 3</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" checked="" disabled="" id="task-item-4" />checked item 4</li>
+</ul>
+"
+`;
+
+exports[`markdown-it-task-lists renders dirty correctly 1`] = `
+"<ul class="contains-task-list">
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-1" />unchecked todo item 1</li>
+<li>[ ]</li>
+<li>[  ] not a todo item 2</li>
+<li>[ x] not a todo item 3</li>
+<li>[x ] not a todo item 4</li>
+<li>[ x ] not a todo item 5</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" checked="" disabled="" id="task-item-7" />todo item 6</li>
+</ul>
+"
+`;
+
+exports[`markdown-it-task-lists renders mixedNested correctly 1`] = `
+"<h1>Test 1</h1>
+<ol>
+<li>foo
+<ul class="contains-task-list">
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-4" />nested unchecked item 1</li>
+<li>not a todo item 2</li>
+<li>not a todo item 3</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" checked="" disabled="" id="task-item-7" />nested checked item 4</li>
+</ul>
+</li>
+<li>bar</li>
+<li>spam</li>
+</ol>
+<h1>Test 2</h1>
+<ul>
+<li>foo
+<ul class="contains-task-list">
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-14" />nested unchecked item 1</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-15" />nested unchecked item 2</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" checked="" disabled="" id="task-item-16" />nested checked item 3</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" checked="" disabled="" id="task-item-17" />nested checked item 4</li>
+</ul>
+</li>
+</ul>
+"
+`;
+
+exports[`markdown-it-task-lists renders ordered correctly 1`] = `
+"<ol class="contains-task-list">
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" checked="" disabled="" id="task-item-1" />checked ordered 1</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-2" />unchecked ordered 2</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" checked="" disabled="" id="task-item-3" />checked ordered 3</li>
+<li class="task-list-item "><input class="task-list-item-checkbox" type="checkbox" disabled="" id="task-item-4" />unchecked ordered 4</li>
+</ol>
+"
+`;
--- a/markdown-it-plugins/src/task-lists/index.test.ts
+++ b/markdown-it-plugins/src/task-lists/index.test.ts
@ -0,0 +1,74 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import MarkdownIt from 'markdown-it/lib'
+import { taskLists } from './index.js'
+import { describe, expect, it } from '@jest/globals'
+
+describe('markdown-it-task-lists', () => {
+  it('renders bullet correctly', () => {
+    const taskListMarkdownParser = new MarkdownIt().use(taskLists)
+    expect(
+      taskListMarkdownParser.render(`
+- [ ] unchecked item 1
+- [ ] unchecked item 2
+- [ ] unchecked item 3
+- [x] checked item 4
+`)
+    ).toMatchSnapshot()
+  })
+
+  it('renders dirty correctly', () => {
+    const taskListMarkdownParser = new MarkdownIt().use(taskLists)
+    expect(
+      taskListMarkdownParser.render(`
+-   [ ] unchecked todo item 1
+- [ ]
+- [  ] not a todo item 2
+- [ x] not a todo item 3
+- [x ] not a todo item 4
+- [ x ] not a todo item 5
+-   [x] todo item 6
+`)
+    ).toMatchSnapshot()
+  })
+
+  it('renders mixedNested correctly', () => {
+    const taskListMarkdownParser = new MarkdownIt().use(taskLists)
+    expect(
+      taskListMarkdownParser.render(`
+# Test 1
+
+1. foo
+   * [ ] nested unchecked item 1
+   * not a todo item 2
+   * not a todo item 3
+   * [x] nested checked item 4
+2. bar
+3. spam
+
+# Test 2
+
+- foo
+  - [ ] nested unchecked item 1
+  - [ ] nested unchecked item 2
+  - [x] nested checked item 3
+  - [X] nested checked item 4
+`)
+    ).toMatchSnapshot()
+  })
+  it('renders ordered correctly', () => {
+    const taskListMarkdownParser = new MarkdownIt().use(taskLists)
+    expect(
+      taskListMarkdownParser.render(`
+1. [x] checked ordered 1
+2. [ ] unchecked ordered 2
+3. [x] checked ordered 3
+4. [ ] unchecked ordered 4
+`)
+    ).toMatchSnapshot()
+  })
+})
--- a/markdown-it-plugins/src/task-lists/index.ts
+++ b/markdown-it-plugins/src/task-lists/index.ts
@ -0,0 +1,159 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+// Markdown-it plugin to render GitHub-style task lists; see
+//
+// https://github.com/blog/1375-task-lists-in-gfm-issues-pulls-comments
+// https://github.com/blog/1825-task-lists-in-all-markdown-documents
+
+import MarkdownIt from 'markdown-it/lib'
+import StateCore from 'markdown-it/lib/rules_core/state_core.js'
+import Token from 'markdown-it/lib/token.js'
+
+interface TaskListsOptions {
+  enabled: boolean
+  label: boolean
+  lineNumber: boolean
+}
+
+const checkboxRegex = /^ *\[([\sx])] /i
+
+export function taskLists(
+  md: MarkdownIt,
+  options: TaskListsOptions = { enabled: false, label: false, lineNumber: false }
+): void {
+  md.core.ruler.after('inline', 'task-lists', (state) => processToken(state, options))
+  md.renderer.rules.taskListItemCheckbox = (tokens) => {
+    const token = tokens[0]
+    const checkedAttribute = token.attrGet('checked') ? 'checked="" ' : ''
+    const disabledAttribute = token.attrGet('disabled') ? 'disabled="" ' : ''
+    const line = token.attrGet('line')
+    const idAttribute = `id="${token.attrGet('id')}" `
+    const dataLineAttribute = line && options.lineNumber ? `data-line="${line}" ` : ''
+
+    return `<input class="task-list-item-checkbox" type="checkbox" ${checkedAttribute}${disabledAttribute}${dataLineAttribute}${idAttribute}/>`
+  }
+
+  md.renderer.rules.taskListItemLabel_close = () => {
+    return '</label>'
+  }
+
+  md.renderer.rules.taskListItemLabel_open = (tokens: Token[]) => {
+    const token = tokens[0]
+    const id = token.attrGet('id')
+    return `<label for="${id}">`
+  }
+}
+
+function processToken(state: StateCore, options: TaskListsOptions): boolean {
+  const allTokens = state.tokens
+  for (let i = 2; i < allTokens.length; i++) {
+    if (!isTodoItem(allTokens, i)) {
+      continue
+    }
+
+    todoify(allTokens[i], options)
+    allTokens[i - 2].attrJoin('class', `task-list-item ${options.enabled ? ' enabled' : ''}`)
+
+    const parentToken = findParentToken(allTokens, i - 2)
+    if (parentToken) {
+      const classes = parentToken.attrGet('class') ?? ''
+      if (!classes.match(/(^| )contains-task-list/)) {
+        parentToken.attrJoin('class', 'contains-task-list')
+      }
+    }
+  }
+  return false
+}
+
+function findParentToken(tokens: Token[], index: number): Token | undefined {
+  const targetLevel = tokens[index].level - 1
+  for (let currentTokenIndex = index - 1; currentTokenIndex >= 0; currentTokenIndex--) {
+    if (tokens[currentTokenIndex].level === targetLevel) {
+      return tokens[currentTokenIndex]
+    }
+  }
+  return undefined
+}
+
+function isTodoItem(tokens: Token[], index: number): boolean {
+  return (
+    isInline(tokens[index]) &&
+    isParagraph(tokens[index - 1]) &&
+    isListItem(tokens[index - 2]) &&
+    startsWithTodoMarkdown(tokens[index])
+  )
+}
+
+function todoify(token: Token, options: TaskListsOptions): void {
+  if (token.children == null) {
+    return
+  }
+
+  const id = generateIdForToken(token)
+
+  token.children.splice(0, 0, createCheckboxToken(token, options.enabled, id))
+  token.children[1].content = token.children[1].content.replace(checkboxRegex, '')
+
+  if (options.label) {
+    token.children.splice(1, 0, createLabelBeginToken(id))
+    token.children.push(createLabelEndToken())
+  }
+}
+
+function generateIdForToken(token: Token): string {
+  if (token.map) {
+    return `task-item-${token.map[0]}`
+  } else {
+    return `task-item-${Math.ceil(Math.random() * (10000 * 1000) - 1000)}`
+  }
+}
+
+function createCheckboxToken(token: Token, enabled: boolean, id: string): Token {
+  const checkbox = new Token('taskListItemCheckbox', '', 0)
+  if (!enabled) {
+    checkbox.attrSet('disabled', 'true')
+  }
+  if (token.map) {
+    checkbox.attrSet('line', token.map[0].toString())
+  }
+
+  checkbox.attrSet('id', id)
+
+  const checkboxRegexResult = checkboxRegex.exec(token.content)
+  const isChecked = checkboxRegexResult?.[1].toLowerCase() === 'x'
+  if (isChecked) {
+    checkbox.attrSet('checked', 'true')
+  }
+
+  return checkbox
+}
+
+function createLabelBeginToken(id: string): Token {
+  const labelBeginToken = new Token('taskListItemLabel_open', '', 1)
+  labelBeginToken.attrSet('id', id)
+  return labelBeginToken
+}
+
+function createLabelEndToken(): Token {
+  return new Token('taskListItemLabel_close', '', -1)
+}
+
+function isInline(token: Token): boolean {
+  return token.type === 'inline'
+}
+
+function isParagraph(token: Token): boolean {
+  return token.type === 'paragraph_open'
+}
+
+function isListItem(token: Token): boolean {
+  return token.type === 'list_item_open'
+}
+
+function startsWithTodoMarkdown(token: Token): boolean {
+  return checkboxRegex.test(token.content)
+}
--- a/markdown-it-plugins/src/toc/snapshots/index.test.ts.snap
+++ b/markdown-it-plugins/src/toc/snapshots/index.test.ts.snap
@ -0,0 +1,95 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+/*
+ * SPDX-FileCopyrightText: Original: (c) 2018 Fabio Zendhi Nagao / Modifications: (c) 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+exports[`toc ignores the levels in the placeholder if not sorted 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#head-1">Head 1</a><ol><li><a href="#head-2">Head 2</a><ol><li><a href="#head-3">Head 3</a><ol><li><a href="#head-4">Head 4</a></li></ol></li></ol></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Head 2</h2>
+<h3>Head 3</h3>
+<h4>Head 4</h4>
+"
+`;
+
+exports[`toc renders a toc with a level number array 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#head-2">Head 2</a><ol><li><a href="#head-4">Head 4</a></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Head 2</h2>
+<h3>Head 3</h3>
+<h4>Head 4</h4>
+"
+`;
+
+exports[`toc renders a toc with a single level number 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#head-2">Head 2</a><ol><li><a href="#head-3">Head 3</a></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Head 2</h2>
+<h3>Head 3</h3>
+"
+`;
+
+exports[`toc renders a toc with custom allowed token types 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#text"> text</a></li><li><a href="#head-2">Head 2</a></li></ol></nav><h1><code>Head 1</code> text</h1>
+<h1>Head 2</h1>
+"
+`;
+
+exports[`toc renders a toc with custom classes 1`] = `
+"<nav id="containerId" class="containerClass"><ol class="listClass"><li class="itemClass"><a class="linkClass" href="#head-1">Head 1</a><ol class="listClass"><li class="itemClass"><a class="linkClass" href="#heading-2">Heading 2</a><ol class="listClass"><li class="itemClass"><a class="linkClass" href="#heading-3">Heading 3</a></li></ol></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Heading 2</h2>
+<h3>Heading 3</h3>
+"
+`;
+
+exports[`toc renders a toc with custom format function 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#head-1">HEAD 1</a><ol><li><a href="#heading-2">HEADING 2</a><ol><li><a href="#heading-3">HEADING 3</a></li></ol></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Heading 2</h2>
+<h3>Heading 3</h3>
+"
+`;
+
+exports[`toc renders a toc with custom slugify 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#slug-Head 1-0">Head 1</a><ol><li><a href="#slug-Heading 2-0">Heading 2</a><ol><li><a href="#slug-Heading 3-0">Heading 3</a></li></ol></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Heading 2</h2>
+<h3>Heading 3</h3>
+"
+`;
+
+exports[`toc renders a toc with custom unique slug start index 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#head-1-10">Head 1</a><ol><li><a href="#heading-2-10">Heading 2</a><ol><li><a href="#heading-3-10">Heading 3</a></li></ol></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Heading 2</h2>
+<h3>Heading 3</h3>
+"
+`;
+
+exports[`toc renders a toc with default settings 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#head-1">Head 1</a><ol><li><a href="#heading-2">Heading 2</a><ol><li><a href="#heading-3">Heading 3</a></li></ol></li></ol></li><li><a href="#head-1-1">Head 1</a></li><li><a href="#head-1-2">Head 1</a></li><li><a href="#head-1-3">Head 1</a></li></ol></nav><h1>Head 1</h1>
+<h2>Heading 2</h2>
+<h3>Heading 3</h3>
+<h1>Head 1</h1>
+<h1>Head 1</h1>
+<h1>Head 1</h1>
+"
+`;
+
+exports[`toc renders a toc with levels in the placeholder 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#head-2">Head 2</a><ol><li><a href="#head-3">Head 3</a><ol></ol></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Head 2</h2>
+<h3>Head 3</h3>
+<h4>Head 4</h4>
+"
+`;
+
+exports[`toc renders a toc with ordered list 1`] = `
+"<nav class="table-of-contents"><ol><li><a href="#head-1">Head 1</a><ol><li><a href="#heading-2">Heading 2</a><ol><li><a href="#heading-3">Heading 3</a></li></ol></li></ol></li></ol></nav><h1>Head 1</h1>
+<h2>Heading 2</h2>
+<h3>Heading 3</h3>
+"
+`;
+
+exports[`toc renders a toc with unordered list 1`] = `
+"<nav class="table-of-contents"><ul><li><a href="#head-1">Head 1</a><ul><li><a href="#heading-2">Heading 2</a><ul><li><a href="#heading-3">Heading 3</a></li></ul></li></ul></li></ul></nav><h1>Head 1</h1>
+<h2>Heading 2</h2>
+<h3>Heading 3</h3>
+"
+`;
--- a/markdown-it-plugins/src/toc/index.test.ts
+++ b/markdown-it-plugins/src/toc/index.test.ts
@ -0,0 +1,186 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import MarkdownIt from 'markdown-it/lib'
+import { toc } from './plugin.js'
+import { describe, expect, it, jest } from '@jest/globals'
+
+describe('toc', () => {
+  const simpleContent = `
+[toc]
+
+# Head 1
+
+## Heading 2
+
+### Heading 3
+`
+
+  it('renders a toc with default settings', () => {
+    const markdownIt = new MarkdownIt().use(toc)
+    expect(
+      markdownIt.render(`
+[toc]
+
+# Head 1
+
+## Heading 2
+
+### Heading 3
+
+# Head 1
+
+# Head 1
+
+# Head 1
+`)
+    ).toMatchSnapshot()
+  })
+
+  it('renders a toc with custom slugify', () => {
+    const markdownIt = new MarkdownIt().use(toc, { slugify: (slug, index) => `slug-${slug}-${index}` })
+    expect(markdownIt.render(simpleContent)).toMatchSnapshot()
+  })
+
+  it('renders a toc with custom unique slug start index', () => {
+    const markdownIt = new MarkdownIt().use(toc, { uniqueSlugStartIndex: 10 })
+    expect(markdownIt.render(simpleContent)).toMatchSnapshot()
+  })
+
+  it('renders a toc with custom classes', () => {
+    const markdownIt = new MarkdownIt().use(toc, {
+      containerClass: 'containerClass',
+      listClass: 'listClass',
+      itemClass: 'itemClass',
+      linkClass: 'linkClass',
+      containerId: 'containerId'
+    })
+    expect(markdownIt.render(simpleContent)).toMatchSnapshot()
+  })
+
+  it('renders a toc with a single level number', () => {
+    const markdownIt = new MarkdownIt().use(toc, { level: 2 })
+    expect(
+      markdownIt.render(`
+[toc]
+
+# Head 1
+
+## Head 2
+
+### Head 3
+`)
+    ).toMatchSnapshot()
+  })
+
+  it('renders a toc with a level number array', () => {
+    const markdownIt = new MarkdownIt().use(toc, { level: [2, 4] })
+    expect(
+      markdownIt.render(`
+[toc]
+
+# Head 1
+
+## Head 2
+
+### Head 3
+
+#### Head 4
+`)
+    ).toMatchSnapshot()
+  })
+
+  it('renders a toc with levels in the placeholder', () => {
+    const markdownIt = new MarkdownIt().use(toc)
+    expect(
+      markdownIt.render(`
+[toc:2:3]
+
+# Head 1
+
+## Head 2
+
+### Head 3
+
+#### Head 4
+`)
+    ).toMatchSnapshot()
+  })
+
+  it('ignores the levels in the placeholder if not sorted', () => {
+    const markdownIt = new MarkdownIt().use(toc)
+    expect(
+      markdownIt.render(`
+[toc:3:2]
+
+# Head 1
+
+## Head 2
+
+### Head 3
+
+#### Head 4
+`)
+    ).toMatchSnapshot()
+  })
+
+  it('renders a toc with ordered list', () => {
+    const markdownIt = new MarkdownIt().use(toc, { listType: 'ol' })
+    expect(markdownIt.render(simpleContent)).toMatchSnapshot()
+  })
+
+  it('renders a toc with unordered list', () => {
+    const markdownIt = new MarkdownIt().use(toc, { listType: 'ul' })
+    expect(markdownIt.render(simpleContent)).toMatchSnapshot()
+  })
+
+  it('renders a toc with custom format function', () => {
+    const markdownIt = new MarkdownIt().use(toc, { format: (name) => name.toUpperCase() })
+    expect(markdownIt.render(simpleContent)).toMatchSnapshot()
+  })
+
+  it('renders a toc and executes the callback', () => {
+    const callback = jest.fn()
+    const markdownIt = new MarkdownIt().use(toc, { callback })
+    markdownIt.render(simpleContent)
+    expect(callback).toBeCalledWith({
+      children: [
+        {
+          children: [
+            {
+              children: [
+                {
+                  children: [],
+                  level: 3,
+                  name: 'Heading 3'
+                }
+              ],
+              level: 2,
+              name: 'Heading 2'
+            }
+          ],
+          level: 1,
+          name: 'Head 1'
+        }
+      ],
+      level: 0,
+      name: ''
+    })
+  })
+
+  it('renders a toc with custom allowed token types', () => {
+    const markdownIt = new MarkdownIt().use(toc, { allowedTokenTypes: ['text'] })
+    expect(
+      markdownIt.render(`
+[toc]
+
+# \`Head 1\` text
+
+# Head 2
+    `)
+    ).toMatchSnapshot()
+  })
+})
--- a/markdown-it-plugins/src/toc/index.ts
+++ b/markdown-it-plugins/src/toc/index.ts
@ -0,0 +1,10 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+export { toc } from './plugin.js'
+export { defaultOptions } from './toc-options.js'
+export type { TocAst } from './toc-ast.js'
+export type { TocOptions } from './toc-options.js'
--- a/markdown-it-plugins/src/toc/plugin.ts
+++ b/markdown-it-plugins/src/toc/plugin.ts
@ -0,0 +1,157 @@
+/*
+ * SPDX-FileCopyrightText: Original: (c) 2018 Fabio Zendhi Nagao / Modifications: (c) 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import { Optional } from '@mrdrogdrog/optional'
+import { encode as htmlencode } from 'html-entities'
+import MarkdownIt from 'markdown-it'
+import StateBlock from 'markdown-it/lib/rules_block/state_block.js'
+import Token from 'markdown-it/lib/token.js'
+import { TocAst } from './toc-ast.js'
+import { renderAstToHtml } from './toc-body-renderer.js'
+import { defaultOptions, TocOptions } from './toc-options.js'
+
+class Plugin {
+  private readonly tocOptions: TocOptions
+  private currentAst?: TocAst
+  public readonly START_LEVEL_ATTRIBUTE_NAME = 'startLevel'
+  public readonly END_LEVEL_ATTRIBUTE_NAME = 'endLevel'
+
+  private readonly TOC_PLACEHOLDER = /^\[\[toc(?::(\d+):(\d+))?]]|\[toc(?::(\d+):(\d+))?]$/i
+
+  public constructor(md: MarkdownIt, tocOptions?: Partial<TocOptions>) {
+    this.tocOptions = {
+      ...defaultOptions,
+      ...tocOptions
+    }
+    md.renderer.rules.tocOpen = this.renderTocOpen.bind(this)
+    md.renderer.rules.tocClose = this.renderTocClose.bind(this)
+    md.renderer.rules.tocBody = this.renderTocBody.bind(this)
+    md.core.ruler.push('generateTocAst', (state) => this.generateTocAst(state.tokens))
+    md.block.ruler.before('heading', 'toc', this.generateTocToken.bind(this), {
+      alt: ['paragraph', 'reference', 'blockquote']
+    })
+  }
+
+  private generateTocToken(state: StateBlock, startLine: number, _endLine: number, silent: boolean): boolean {
+    const pos = state.bMarks[startLine] + state.tShift[startLine]
+    const max = state.eMarks[startLine]
+
+    // use whitespace as a line tokenizer and extract the first token
+    // to test against the placeholder anchored pattern, rejecting if false
+    const lineFirstToken = state.src.slice(pos, max).split(' ')[0]
+
+    const matches = this.TOC_PLACEHOLDER.exec(lineFirstToken)
+    if (matches === null) {
+      return false
+    }
+
+    if (silent) {
+      return true
+    }
+
+    state.line = startLine + 1
+    const tocOpenToken = state.push('tocOpen', 'nav', 1)
+    tocOpenToken.markup = ''
+    tocOpenToken.map = [startLine, state.line]
+
+    const tocBodyToken = state.push('tocBody', '', 0)
+    tocBodyToken.markup = ''
+    tocBodyToken.map = [startLine, state.line]
+    tocBodyToken.children = []
+
+    const startLevel = matches[3]
+    const endLevel = matches[4]
+    if (startLevel !== undefined && endLevel !== undefined) {
+      tocBodyToken.attrSet(this.START_LEVEL_ATTRIBUTE_NAME, startLevel)
+      tocBodyToken.attrSet(this.END_LEVEL_ATTRIBUTE_NAME, endLevel)
+    }
+
+    const tocCloseToken = state.push('tocClose', 'nav', -1)
+    tocCloseToken.markup = ''
+
+    return true
+  }
+
+  private generateTocAst(tokens: Token[]) {
+    this.currentAst = this.headings2ast(tokens)
+    this.tocOptions.callback?.(this.currentAst)
+  }
+
+  private renderTocOpen(): string {
+    const id = this.tocOptions.containerId ? ` id="${htmlencode(this.tocOptions.containerId)}"` : ''
+    return `<nav${id} class="${htmlencode(this.tocOptions.containerClass)}">`
+  }
+
+  private renderTocClose(): string {
+    return '</nav>'
+  }
+
+  private createNumberRangeArray(from: number, to: number): number[] {
+    return Array.from(Array(to - from + 1).keys()).map((value) => value + from)
+  }
+
+  private renderTocBody(tokens: Token[], index: number): string {
+    const bodyToken = tokens[index]
+    const startLevel = Optional.ofNullable(bodyToken?.attrGet(this.START_LEVEL_ATTRIBUTE_NAME))
+      .map(parseInt)
+      .filter(isFinite)
+      .orElse(null)
+    const endLevel = Optional.ofNullable(bodyToken?.attrGet(this.END_LEVEL_ATTRIBUTE_NAME))
+      .map(parseInt)
+      .filter(isFinite)
+      .orElse(null)
+
+    const modifiedTocOptions =
+      startLevel !== null && endLevel !== null && startLevel <= endLevel
+        ? { ...this.tocOptions, level: this.createNumberRangeArray(startLevel, endLevel) }
+        : this.tocOptions
+
+    return this.currentAst ? renderAstToHtml(this.currentAst, modifiedTocOptions) : ''
+  }
+
+  private headings2ast(tokens: Token[]): TocAst {
+    const ast: TocAst = { level: 0, name: '', children: [] }
+    const stack = [ast]
+
+    for (let tokenIndex = 0; tokenIndex < tokens.length; tokenIndex++) {
+      const token = tokens[tokenIndex]
+      if (token.type !== 'heading_open') {
+        continue
+      }
+      const nextToken = tokens[tokenIndex + 1]
+      const key = (nextToken?.children ?? [])
+        .filter((token) => this.tocOptions.allowedTokenTypes.includes(token.type))
+        .reduce((s, t) => s + t.content, '')
+
+      const node: TocAst = {
+        level: parseInt(token.tag.slice(1), 10),
+        name: key,
+        children: []
+      }
+      if (node.level > stack[0].level) {
+        stack[0].children.push(node)
+        stack.unshift(node)
+      } else if (node.level === stack[0].level) {
+        stack[1].children.push(node)
+        stack[0] = node
+      } else {
+        while (node.level <= stack[0].level) stack.shift()
+        stack[0].children.push(node)
+        stack.unshift(node)
+      }
+    }
+
+    return ast
+  }
+}
+
+/**
+ * Creates a new TOC plugin.
+ *
+ * @param md The markdown-it instance that should be configured
+ * @param options The additional options that configure the plugin
+ */
+export const toc: MarkdownIt.PluginWithOptions<Partial<TocOptions>> = (md, options) => new Plugin(md, options)
--- a/markdown-it-plugins/src/toc/toc-ast.ts
+++ b/markdown-it-plugins/src/toc/toc-ast.ts
@ -0,0 +1,11 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+export interface TocAst {
+  level: number
+  name: string
+  children: TocAst[]
+}
--- a/markdown-it-plugins/src/toc/toc-body-renderer.ts
+++ b/markdown-it-plugins/src/toc/toc-body-renderer.ts
@ -0,0 +1,63 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import { encode as htmlencode } from 'html-entities'
+import { TocAst } from './toc-ast.js'
+import { TocOptions } from './toc-options.js'
+
+/**
+ * Renders an HTML listing of the given tree.
+ *
+ * @param tree The tree that should be represented as HTML tree
+ * @param tocOptions additional options that configure the rendering
+ */
+export function renderAstToHtml(tree: TocAst, tocOptions: TocOptions): string {
+  if (tree.children.length === 0) {
+    return ''
+  }
+
+  let buffer = ''
+  const tag = htmlencode(tocOptions.listType)
+  if (tree.level === 0 || isLevelSelected(tree.level, tocOptions.level)) {
+    const listClass = tocOptions.listClass !== '' ? ` class="${htmlencode(tocOptions.listClass)}"` : ''
+    buffer += `<${tag + listClass}>`
+  }
+  const usedSlugs: string[] = []
+  const parts = tree.children.map((node) => {
+    const subNodesHtml = renderAstToHtml(node, tocOptions)
+    if (isLevelSelected(node.level, tocOptions.level)) {
+      const anchorContent = htmlencode(tocOptions.format?.(node.name) ?? node.name)
+      const anchorId = generateUniqueSlug(node.name, tocOptions, usedSlugs)
+      usedSlugs.push(anchorId)
+      const itemClass = tocOptions.itemClass !== '' ? ` class="${htmlencode(tocOptions.itemClass)}"` : ''
+      const linkClass = tocOptions.linkClass !== '' ? ` class="${htmlencode(tocOptions.linkClass)}"` : ''
+      return `<li${itemClass}><a${linkClass} href="#${anchorId}">${anchorContent}</a>${subNodesHtml}</li>`
+    } else {
+      return subNodesHtml
+    }
+  })
+  buffer += parts.join('')
+  if (tree.level === 0 || isLevelSelected(tree.level, tocOptions.level)) {
+    buffer += `</${tag}>`
+  }
+  return buffer
+}
+
+function isLevelSelected(level: number, levels: number | number[]): boolean {
+  return Array.isArray(levels) ? levels.includes(level) : level >= levels
+}
+
+function generateUniqueSlug(slug: string, tocOptions: TocOptions, usedSlugs: string[]): string {
+  for (let index = tocOptions.uniqueSlugStartIndex; index < Number.MAX_VALUE; index += 1) {
+    const slugCandidate: string = tocOptions.slugify(slug, index)
+    const slugWithIndex = index === 0 ? slugCandidate : `${slugCandidate}-${index}`
+
+    if (!usedSlugs.includes(slugWithIndex)) {
+      return slugWithIndex
+    }
+  }
+  throw new Error('Too many slug with same name')
+}
--- a/markdown-it-plugins/src/toc/toc-options.ts
+++ b/markdown-it-plugins/src/toc/toc-options.ts
@ -0,0 +1,42 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+import { TocAst } from './toc-ast.js'
+
+export type TocOptions = {
+  slugify: (name: string, index: number) => string
+  uniqueSlugStartIndex: number
+  containerClass: string
+  containerId: string
+  listClass: string
+  itemClass: string
+  linkClass: string
+  level: number | number[]
+  listType: 'ol' | 'ul'
+  format?: (name: string) => string
+  callback?: (ast: TocAst) => void
+  allowedTokenTypes: string[]
+}
+
+function defaultSlugify(name: string) {
+  return encodeURIComponent(String(name).trim().toLowerCase().replace(/\s+/g, '-'))
+}
+
+/**
+ * The default options for the toc plugin.
+ */
+export const defaultOptions: TocOptions = {
+  uniqueSlugStartIndex: 0,
+  containerClass: 'table-of-contents',
+  containerId: '',
+  listClass: '',
+  itemClass: '',
+  linkClass: '',
+  level: 1,
+  listType: 'ol',
+  allowedTokenTypes: ['text', 'code_inline'],
+  slugify: defaultSlugify
+}
--- a/markdown-it-plugins/tsconfig.base.json
+++ b/markdown-it-plugins/tsconfig.base.json
@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "removeComments": true,
+    "preserveConstEnums": true,
+    "lib": [
+      "es2022",
+      "dom"
+    ],
+    "declaration": true,
+    "strict": true,
+    "allowSyntheticDefaultImports": true,
+    "forceConsistentCasingInFileNames": true,
+    "esModuleInterop": true,
+    "allowJs": true,
+    "sourceMap": true
+  },
+  "include": [
+    "src"
+  ],
+  "exclude": [
+    "../dist", "**/*.test.ts"]
+}
--- a/markdown-it-plugins/tsconfig.base.json.license
+++ b/markdown-it-plugins/tsconfig.base.json.license
@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 Tilman Vatteroth
+
+SPDX-License-Identifier: CC0-1.0
--- a/markdown-it-plugins/tsconfig.cjs.json
+++ b/markdown-it-plugins/tsconfig.cjs.json
@ -0,0 +1,10 @@
+{
+  "extends" : "./tsconfig.base.json",
+  "compilerOptions": {
+    "module": "CommonJS",
+    "target": "ES2015",
+    "outDir": "../dist/cjs",
+    "declarationDir": "../dist/cjs",
+    "moduleResolution": "node"
+  }
+}
--- a/markdown-it-plugins/tsconfig.cjs.json.license
+++ b/markdown-it-plugins/tsconfig.cjs.json.license
@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 Tilman Vatteroth
+
+SPDX-License-Identifier: CC0-1.0
--- a/markdown-it-plugins/tsconfig.esm.json
+++ b/markdown-it-plugins/tsconfig.esm.json
@ -0,0 +1,10 @@
+{
+  "extends" : "./tsconfig.base.json",
+  "compilerOptions": {
+    "module": "NodeNext",
+    "target" : "esnext",
+    "outDir": "../dist/esm",
+    "moduleResolution": "NodeNext",
+    "declarationDir": "../dist/esm"
+  }
+}
--- a/markdown-it-plugins/tsconfig.esm.json.license
+++ b/markdown-it-plugins/tsconfig.esm.json.license
@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 Tilman Vatteroth
+
+SPDX-License-Identifier: CC0-1.0
--- a/markdown-it-plugins/tsconfig.test.json
+++ b/markdown-it-plugins/tsconfig.test.json
@ -0,0 +1,6 @@
+{
+  "extends" : "./tsconfig.esm.json",
+  "exclude": [
+    "../dist"
+  ]
+}
--- a/markdown-it-plugins/tsconfig.test.json.license
+++ b/markdown-it-plugins/tsconfig.test.json.license
@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 Tilman Vatteroth
+
+SPDX-License-Identifier: CC0-1.0