feat: json $schema locally => ./node_modules/html-w3c-validator/schema/schema.json

There was an error thrown by `table` library to print validation results
when there were 2 (or more) errors, with one error with line/column
and the other error without specified line/column.

Fixes #6

.commitlintrc.json

@@ -1 +0,0 @@
-{ "extends": ["@commitlint/config-conventional"] }

.eslintrc.json

@@ -1,16 +1,18 @@
 {
-  "extends": ["conventions", "prettier"],
+  "root": true,
-  "plugins": ["prettier", "import", "unicorn"],
+  "extends": ["conventions"],
+  "plugins": ["promise", "unicorn"],
+  "overrides": [
+    {
+      "files": ["*.ts", "*.tsx"],
+      "parser": "@typescript-eslint/parser",
+      "plugins": ["@typescript-eslint"],
       "parserOptions": {
-    "project": "./tsconfig.json"
+        "projectService": true
-  },
-  "env": {
-    "node": true
       },
       "rules": {
-    "prettier/prettier": "error",
+        "@typescript-eslint/no-unnecessary-condition": "off"
-    "import/extensions": ["error", "always"],
-    "unicorn/prevent-abbreviations": "error",
-    "unicorn/prefer-node-protocol": "error"
       }
     }
+  ]
+}

.github/ISSUE_TEMPLATE/BUG.md

@@ -1,13 +1,13 @@
 ---
-name: '🐛 Bug Report'
+name: "🐛 Bug Report"
-about: 'Report an unexpected problem or unintended behavior.'
+about: "Report an unexpected problem or unintended behavior."
-title: '[Bug]'
+title: "[Bug]"
-labels: 'bug'
+labels: "bug"
 ---
 
 <!--
-  Please provide a clear and concise description of what the bug is. Include
+Please provide a clear and concise description of what the bug is.
-  screenshots if needed. Please make sure your issue has not already been fixed.
+Include screenshots if needed. Please make sure your issue has not already been fixed.
 -->
 
 ## Steps To Reproduce

.github/ISSUE_TEMPLATE/DOCUMENTATION.md

@@ -1,8 +1,8 @@
 ---
-name: '📜 Documentation'
+name: "📜 Documentation"
-about: 'Correct spelling errors, improvements or additions to documentation files (README, CONTRIBUTING...).'
+about: "Correct spelling errors, improvements or additions to documentation files (README, CONTRIBUTING...)."
-title: '[Documentation]'
+title: "[Documentation]"
-labels: 'documentation'
+labels: "documentation"
 ---
 
 <!-- Please make sure your issue has not already been fixed. -->

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

@@ -1,8 +1,8 @@
 ---
-name: '✨ Feature Request'
+name: "✨ Feature Request"
-about: 'Suggest a new feature idea.'
+about: "Suggest a new feature idea."
-title: '[Feature]'
+title: "[Feature]"
-labels: 'feature request'
+labels: "feature request"
 ---
 
 <!-- Please make sure your issue has not already been fixed. -->

.github/ISSUE_TEMPLATE/IMPROVEMENT.md

@@ -1,8 +1,8 @@
 ---
-name: '🔧 Improvement'
+name: "🔧 Improvement"
-about: 'Improve structure/format/performance/refactor/tests of the code.'
+about: "Improve structure/format/performance/refactor/tests of the code."
-title: '[Improvement]'
+title: "[Improvement]"
-labels: 'improvement'
+labels: "improvement"
 ---
 
 <!-- Please make sure your issue has not already been fixed. -->

.github/ISSUE_TEMPLATE/QUESTION.md

@@ -1,8 +1,8 @@
 ---
-name: '🙋 Question'
+name: "🙋 Question"
-about: 'Further information is requested.'
+about: "Further information is requested."
-title: '[Question]'
+title: "[Question]"
-labels: 'question'
+labels: "question"
 ---
 
 ### Question

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,6 @@
 <!-- Please first discuss the change you wish to make via issue before making a change. It might avoid a waste of your time. -->
 
-## What changes this PR introduce?
+# What changes this PR introduce?
 
 ## List any relevant issue numbers
 

.github/workflows/build.yml

@@ -1,27 +1,27 @@
-name: 'Build'
+name: "Build"
 
 on:
   push:
     branches: [develop]
   pull_request:
-    branches: [master, develop]
+    branches: [main, develop]
 
 jobs:
   build:
-    runs-on: 'ubuntu-latest'
+    runs-on: "ubuntu-latest"
     steps:
-      - uses: 'actions/checkout@v3.3.0'
+      - uses: "actions/checkout@v4.2.2"
 
-      - name: 'Use Node.js'
+      - name: "Setup Node.js"
-        uses: 'actions/setup-node@v3.6.0'
+        uses: "actions/setup-node@v4.1.0"
         with:
-          node-version: 'lts/*'
+          node-version: "lts/*"
-          cache: 'npm'
+          cache: "npm"
 
-      - name: 'Install'
+      - name: "Install dependencies"
-        run: 'npm install'
+        run: "npm clean-install"
 
-      - name: 'Build'
+      - name: "Build"
-        run: 'npm run build'
+        run: "node --run build"
 
-      - run: 'npm run build:typescript'
+      - run: "node --run build:typescript"

.github/workflows/lint.yml

@@ -1,28 +1,26 @@
-name: 'Lint'
+name: "Lint"
 
 on:
   push:
     branches: [develop]
   pull_request:
-    branches: [master, develop]
+    branches: [main, develop]
 
 jobs:
   lint:
-    runs-on: 'ubuntu-latest'
+    runs-on: "ubuntu-latest"
     steps:
-      - uses: 'actions/checkout@v3.3.0'
+      - uses: "actions/checkout@v4.2.2"
 
-      - name: 'Use Node.js'
+      - name: "Setup Node.js"
-        uses: 'actions/setup-node@v3.6.0'
+        uses: "actions/setup-node@v4.1.0"
         with:
-          node-version: 'lts/*'
+          node-version: "lts/*"
-          cache: 'npm'
+          cache: "npm"
 
-      - name: 'Install'
+      - name: "Install dependencies"
-        run: 'npm install'
+        run: "npm clean-install"
 
-      - run: 'npm run lint:commit -- --to "${{ github.sha }}"'
+      - run: "node --run lint:editorconfig"
-      - run: 'npm run lint:editorconfig'
+      - run: "node --run lint:eslint"
-      - run: 'npm run lint:markdown'
+      - run: "node --run lint:prettier"
-      - run: 'npm run lint:eslint'
-      - run: 'npm run lint:prettier'

.github/workflows/release.yml

@@ -1,34 +1,42 @@
-name: 'Release'
+name: "Release"
 
 on:
   push:
-    branches: [master]
+    branches: [main, beta]
 
 jobs:
   release:
-    runs-on: 'ubuntu-latest'
+    runs-on: "ubuntu-latest"
+    permissions:
+      contents: "write"
+      issues: "write"
+      pull-requests: "write"
+      id-token: "write"
     steps:
-      - uses: 'actions/checkout@v3.3.0'
+      - uses: "actions/checkout@v4.2.2"
         with:
           fetch-depth: 0
           persist-credentials: false
 
-      - name: 'Use Node.js'
+      - name: "Setup Node.js"
-        uses: 'actions/setup-node@v3.6.0'
+        uses: "actions/setup-node@v4.1.0"
         with:
-          node-version: 'lts/*'
+          node-version: "lts/*"
-          cache: 'npm'
+          cache: "npm"
 
-      - name: 'Install'
+      - name: "Install dependencies"
-        run: 'npm install'
+        run: "npm clean-install"
 
-      - name: 'Build'
+      - name: "Build"
-        run: 'npm run build'
+        run: "node --run build"
 
-      - run: 'npm run build:typescript'
+      - run: "node --run build:typescript"
 
-      - name: 'Release'
+      - name: "Verify the integrity of provenance attestations and registry signatures for installed dependencies"
-        run: 'npm run release'
+        run: "npm audit signatures"
+
+      - name: "Release"
+        run: "node --run release"
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/test.yml

@@ -1,28 +1,28 @@
-name: 'Test'
+name: "Test"
 
 on:
   push:
     branches: [develop]
   pull_request:
-    branches: [master, develop]
+    branches: [main, develop]
 
 jobs:
   test:
-    runs-on: 'ubuntu-latest'
+    runs-on: "ubuntu-latest"
     steps:
-      - uses: 'actions/checkout@v3.3.0'
+      - uses: "actions/checkout@v4.2.2"
 
-      - name: 'Use Node.js'
+      - name: "Setup Node.js"
-        uses: 'actions/setup-node@v3.6.0'
+        uses: "actions/setup-node@v4.1.0"
         with:
-          node-version: 'lts/*'
+          node-version: "lts/*"
-          cache: 'npm'
+          cache: "npm"
 
-      - name: 'Install'
+      - name: "Install dependencies"
-        run: 'npm install'
+        run: "npm clean-install"
 
-      - name: 'Build'
+      - name: "Build"
-        run: 'npm run build'
+        run: "node --run build"
 
-      - name: 'Test'
+      - name: "Test"
-        run: 'npm run test'
+        run: "node --run test"

.html-w3c-validatorrc.json

@@ -0,0 +1,3 @@
+{
+  "files": ["./example/build/index.html", "./example/build/about.html"]
+}

.lintstagedrc.json

@@ -1,6 +0,0 @@
-{
-  "*": ["editorconfig-checker"],
-  "*.{js,ts,jsx,tsx}": ["prettier --write", "eslint --fix"],
-  "*.{yml,json}": ["prettier --write"],
-  "*.md": ["prettier --write", "markdownlint --dot --fix"]
-}

.markdownlint-cli2.jsonc

@@ -1,5 +0,0 @@
-{
-  "globs": ["**/*.{md,mdx}"],
-  "ignores": ["**/node_modules"],
-  "customRules": ["markdownlint-rule-relative-links"]
-}

.markdownlint.json

@@ -1,7 +0,0 @@
-{
-  "default": true,
-  "relative-links": true,
-  "extends": "markdownlint/style/prettier",
-  "MD033": false,
-  "MD041": false
-}

.npmrc

@@ -1 +1,2 @@
 save-exact = true
+provenance = true

.prettierignore

@@ -0,0 +1 @@
+fixtures

.prettierrc.json

@@ -1,6 +1,3 @@
 {
-  "singleQuote": true,
+  "semi": false
-  "jsxSingleQuote": true,
-  "semi": false,
-  "trailingComma": "none"
 }

.releaserc.json

@@ -1,18 +1,8 @@
 {
-  "branches": ["master"],
+  "branches": ["main", { "name": "beta", "prerelease": true }],
   "plugins": [
-    [
     "@semantic-release/commit-analyzer",
-      {
-        "preset": "conventionalcommits"
-      }
-    ],
-    [
     "@semantic-release/release-notes-generator",
-      {
-        "preset": "conventionalcommits"
-      }
-    ],
     "@semantic-release/npm",
     "@semantic-release/github"
   ]

.swcrc

@@ -1,22 +1,13 @@
 {
+  "sourceMaps": true,
   "jsc": {
     "parser": {
       "syntax": "typescript",
-      "decorators": true,
       "dynamicImport": true
     },
-    "transform": {
+    "target": "esnext"
-      "legacyDecorator": true,
-      "decoratorMetadata": true
-    },
-    "target": "es2022",
-    "loose": true
   },
   "module": {
-    "type": "es6",
+    "type": "es6"
-    "strict": false,
-    "strictMode": true,
-    "lazy": false,
-    "noInterop": false
   }
 }

.taprc

@@ -1,9 +0,0 @@
-ts: false
-jsx: false
-flow: false
-check-coverage: false
-coverage: false
-timeout: 120000
-
-files:
-  - 'build/**/*.test.js'

.vscode/extensions.json

@@ -1,9 +0,0 @@
-{
-  "recommendations": [
-    "editorconfig.editorconfig",
-    "esbenp.prettier-vscode",
-    "dbaeumer.vscode-eslint",
-    "davidanson.vscode-markdownlint",
-    "ms-azuretools.vscode-docker"
-  ]
-}

.vscode/settings.json

@@ -1,14 +0,0 @@
-{
-  "typescript.tsdk": "node_modules/typescript/lib",
-  "typescript.preferences.importModuleSpecifierEnding": "js",
-  "editor.defaultFormatter": "esbenp.prettier-vscode",
-  "prettier.configPath": ".prettierrc.json",
-  "editor.formatOnSave": true,
-  "editor.codeActionsOnSave": {
-    "source.fixAll": true
-  },
-  "eslint.options": {
-    "ignorePath": ".gitignore"
-  },
-  "prettier.ignorePath": ".gitignore"
-}

CODE_OF_CONDUCT.md

@@ -60,7 +60,7 @@ representative at an online or offline event.
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
 reported to the community leaders responsible for enforcement at
-contact@divlo.fr.
+<contact@theoludwig.fr>.
 All complaints will be reviewed and investigated promptly and fairly.
 
 All community leaders are obligated to respect the privacy and security of the

CONTRIBUTING.md

@@ -2,6 +2,14 @@
 
 Thanks a lot for your interest in contributing to **html-w3c-validator**! 🎉
 
+## Code of Conduct
+
+**html-w3c-validator** adopted the [Contributor Covenant](https://www.contributor-covenant.org/) as its Code of Conduct, and we expect project participants to adhere to it. Please read [the full text](./CODE_OF_CONDUCT.md) so that you can understand what actions will and will not be tolerated.
+
+## Open Development
+
+All work on **html-w3c-validator** happens directly on this repository. Both core team members and external contributors send pull requests which go through the same review process.
+
 ## Types of contributions
 
 - Reporting a bug.
@@ -11,7 +19,7 @@ Thanks a lot for your interest in contributing to **html-w3c-validator**! 🎉
 
 ## Pull Requests
 
-- **Please first discuss** the change you wish to make via [issue](https://github.com/Divlo/html-w3c-validator/issues) before making a change. It might avoid a waste of your time.
+- **Please first discuss** the change you wish to make via [issue](https://github.com/theoludwig/html-w3c-validator/issues) before making a change. It might avoid a waste of your time.
 
 - Ensure your code respect linting.
 
@@ -21,26 +29,4 @@ If you're adding new features to **html-w3c-validator**, please include tests.
 
 ## Commits
 
-The commit message guidelines respect [@commitlint/config-conventional](https://github.com/conventional-changelog/commitlint/tree/master/%40commitlint/config-conventional) and [Semantic Versioning](https://semver.org/) for releases.
+The commit message guidelines adheres to [Conventional Commits](https://www.conventionalcommits.org/) and [Semantic Versioning](https://semver.org/) for releases.
-
-### Types
-
-Types define which kind of changes you made to the project.
-
-| Types    | Description                                                                                                  |
-| -------- | ------------------------------------------------------------------------------------------------------------ |
-| feat     | A new feature.                                                                                               |
-| fix      | A bug fix.                                                                                                   |
-| docs     | Documentation only changes.                                                                                  |
-| style    | Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc).      |
-| refactor | A code change that neither fixes a bug nor adds a feature.                                                   |
-| perf     | A code change that improves performance.                                                                     |
-| test     | Adding missing tests or correcting existing tests.                                                           |
-| build    | Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm).         |
-| ci       | Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs). |
-| chore    | Other changes that don't modify src or test files.                                                           |
-| revert   | Reverts a previous commit.                                                                                   |
-
-### Scopes
-
-Scopes define what part of the code changed.

LICENSE

@@ -1,6 +1,6 @@
-MIT License
+# MIT License
 
-Copyright (c) Divlo
+Copyright (c) Théo LUDWIG <contact@theoludwig.fr>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,19 +1,17 @@
 <h1 align="center">html-w3c-validator</h1>
 
 <p align="center">
-  <strong>CLI for validating multiple html pages using <a href="https://validator.w3.org/">validator.w3.org</a>.</strong>
+  <strong>CLI for validating HTML pages using <a href="https://validator.w3.org/">validator.w3.org</a>.</strong>
-</p>
-
 </p>
 
 <p align="center">
-  <a href="./CONTRIBUTING.md"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat" /></a>
+  <a href="./CONTRIBUTING.md"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat" alt="CONTRIBUTING" /></a>
   <a href="./LICENSE"><img src="https://img.shields.io/badge/licence-MIT-blue.svg" alt="Licence MIT"/></a>
   <a href="./CODE_OF_CONDUCT.md"><img src="https://img.shields.io/badge/Contributor%20Covenant-v2.0%20adopted-ff69b4.svg" alt="Contributor Covenant" /></a>
   <br />
-  <a href="https://github.com/Divlo/html-w3c-validator/actions/workflows/build.yml"><img src="https://github.com/Divlo/html-w3c-validator/actions/workflows/build.yml/badge.svg?branch=develop" /></a>
+  <a href="https://github.com/theoludwig/html-w3c-validator/actions/workflows/build.yml"><img src="https://github.com/theoludwig/html-w3c-validator/actions/workflows/build.yml/badge.svg?branch=develop" alt="Build" /></a>
-  <a href="https://github.com/Divlo/html-w3c-validator/actions/workflows/lint.yml"><img src="https://github.com/Divlo/html-w3c-validator/actions/workflows/lint.yml/badge.svg?branch=develop" /></a>
+  <a href="https://github.com/theoludwig/html-w3c-validator/actions/workflows/lint.yml"><img src="https://github.com/theoludwig/html-w3c-validator/actions/workflows/lint.yml/badge.svg?branch=develop" alt="Lint" /></a>
-  <a href="https://github.com/Divlo/html-w3c-validator/actions/workflows/test.yml"><img src="https://github.com/Divlo/html-w3c-validator/actions/workflows/test.yml/badge.svg?branch=develop" /></a>
+  <a href="https://github.com/theoludwig/html-w3c-validator/actions/workflows/test.yml"><img src="https://github.com/theoludwig/html-w3c-validator/actions/workflows/test.yml/badge.svg?branch=develop" alt="Test" /></a>
   <br />
   <a href="https://conventionalcommits.org"><img src="https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg" alt="Conventional Commits" /></a>
   <a href="https://github.com/semantic-release/semantic-release"><img src="https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg" alt="semantic-release" /></a>
@@ -22,11 +20,11 @@
 
 ## 📜 About
 
-**html-w3c-validator** is a CLI tool to validate multiple html pages using [validator.w3.org](https://validator.w3.org/).
+**html-w3c-validator** is a CLI tool to validate HTML pages using [validator.w3.org](https://validator.w3.org/).
 
 You might use a JavaScript framework or simply use HTML but **you should always validate your production HTML** and this validation should be part of your CI/CD pipeline (tests, linting, etc.).
 
-### Why should I validate my HTML pages?
+### Why is HTML page validation important?
 
 Quote from [https://validator.w3.org/docs/help.html#why-validate](https://validator.w3.org/docs/help.html#why-validate):
 
@@ -40,7 +38,7 @@ You can combine **html-w3c-validator** with [start-server-and-test](https://gith
 
 ### Prerequisites
 
-- [Node.js](https://nodejs.org/) >= 16.0.0
+[Node.js](https://nodejs.org/) >= 16.0.0
 
 ### Installation (with [start-server-and-test](https://github.com/bahmutov/start-server-and-test))
 
@@ -59,8 +57,8 @@ npm install --save-dev html-w3c-validator start-server-and-test
     "start": "serve \"./build\"",
 
     // Command to validate your HTML pages
-    "test:html-w3c-validator": "start-server-and-test \"start\" \"http://127.0.0.1:3000\" \"html-w3c-validator\""
+    "test:html-w3c-validator": "start-server-and-test \"start\" \"http://127.0.0.1:3000\" \"html-w3c-validator\"",
-  }
+  },
 }
 ```
 
@@ -68,17 +66,23 @@ npm install --save-dev html-w3c-validator start-server-and-test
 
 ```jsonc
 {
+  "$schema": "./node_modules/html-w3c-validator/schema/schema.json",
+
+  // URLs to validate.
   "urls": ["http://127.0.0.1:3000/", "http://127.0.0.1:3000/about"],
 
-  // You can also specify HTML files instead of URLs
+  // Files to validate.
-  "files": ["./index.html", "./about.html"]
+  "files": ["./index.html", "./about.html"],
+
+  // Specify the severities of the validator messages to report. (default: ["warning", "error"])
+  "severities": ["info", "warning", "error"],
 }
 ```
 
 ## Usage
 
 ```sh
-npm run test:html-w3c-validator
+node --run test:html-w3c-validator
 ```
 
 Example of output (in case of success):
@@ -95,6 +99,7 @@ See the [./example](./example) folder for practical usage.
 ### Options
 
 ```text
+--current-working-directory <path>  The current working directory (default: `process.cwd()`).
 -V, --version                       Output the version number.
 -h, --help                          Display help for command.
 ```

example/.html-w3c-validatorrc.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "./node_modules/html-w3c-validator/schema/schema.json",
   "urls": ["http://127.0.0.1:3000/", "http://127.0.0.1:3000/about"],
   "files": ["./build/index.html", "./build/about.html"]
 }

example/build/about.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
   <head>
     <meta charset="UTF-8" />

example/build/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
   <head>
     <meta charset="UTF-8" />

example/package.json

@@ -2,12 +2,12 @@
   "name": "example",
   "private": true,
   "scripts": {
-    "start": "serve \"./build\"",
+    "start": "serve ./build",
     "test:html-w3c-validator": "start-server-and-test \"start\" \"http://127.0.0.1:3000\" \"html-w3c-validator\""
   },
   "devDependencies": {
-    "serve": "14.1.2",
+    "serve": "14.2.4",
-    "start-server-and-test": "1.15.2",
+    "start-server-and-test": "2.0.8",
     "html-w3c-validator": "file:.."
   }
 }

package.json

@@ -1,19 +1,20 @@
 {
   "name": "html-w3c-validator",
   "version": "0.0.0-development",
+  "description": "CLI for validating HTML pages using validator.w3.org.",
   "public": true,
-  "description": "CLI for validating multiple html pages using validator.w3.org.",
+  "types": "module",
   "type": "module",
-  "author": "Divlo <contact@divlo.fr>",
+  "author": "Théo LUDWIG <contact@theoludwig.fr>",
   "license": "MIT",
   "repository": {
     "type": "git",
-    "url": "https://github.com/Divlo/html-w3c-validator.git"
+    "url": "https://github.com/theoludwig/html-w3c-validator.git"
   },
   "bugs": {
-    "url": "https://github.com/Divlo/html-w3c-validator/issues"
+    "url": "https://github.com/theoludwig/html-w3c-validator/issues"
   },
-  "homepage": "https://github.com/Divlo/html-w3c-validator#readme",
+  "homepage": "https://github.com/theoludwig/html-w3c-validator#readme",
   "keywords": [
     "cli",
     "html-validator",
@@ -22,63 +23,55 @@
   ],
   "main": "build/index.js",
   "bin": "build/index.js",
-  "engines": {
-    "node": ">=16.0.0",
-    "npm": ">=8.0.0"
-  },
   "files": [
-    "build"
+    "build",
+    "./schema/schema.json",
+    "!**/*.test.js",
+    "!**/*.map"
   ],
+  "publishConfig": {
+    "access": "public",
+    "provenance": true
+  },
+  "engines": {
+    "node": ">=16.0.0"
+  },
   "scripts": {
-    "build": "rimraf ./build && swc ./src --out-dir ./build",
+    "build": "swc ./src --out-dir ./build --strip-leading-paths --delete-dir-on-start",
     "build:typescript": "tsc",
-    "lint:commit": "commitlint",
+    "start": "node --enable-source-maps build/index.js",
     "lint:editorconfig": "editorconfig-checker",
-    "lint:markdown": "markdownlint-cli2",
+    "lint:eslint": "eslint . --max-warnings 0 --report-unused-disable-directives --ignore-path .gitignore",
-    "lint:eslint": "eslint \"**/*.{js,jsx,ts,tsx}\" --ignore-path \".gitignore\"",
+    "lint:prettier": "prettier . --check",
-    "lint:prettier": "prettier \".\" --check --ignore-path \".gitignore\"",
+    "test": "node --enable-source-maps --test",
-    "lint:staged": "lint-staged",
-    "test": "tap",
     "release": "semantic-release"
   },
   "dependencies": {
-    "chalk": "5.2.0",
+    "chalk": "5.3.0",
-    "clipanion": "3.1.0",
+    "clipanion": "3.2.1",
-    "html-validator": "6.0.1",
+    "log-symbols": "6.0.0",
-    "log-symbols": "5.1.0",
+    "ora": "8.1.1",
-    "ora": "6.1.2",
+    "read-pkg": "9.0.1",
-    "read-pkg": "7.1.0",
+    "table": "6.8.2"
-    "table": "6.8.1"
   },
   "devDependencies": {
-    "@commitlint/cli": "17.4.1",
+    "@swc/cli": "0.5.0",
-    "@commitlint/config-conventional": "17.4.0",
+    "@swc/core": "1.9.1",
-    "@swc/cli": "0.1.57",
+    "@tsconfig/strictest": "2.0.5",
-    "@swc/core": "1.3.25",
+    "@types/node": "22.9.0",
-    "@tsconfig/strictest": "1.0.2",
+    "@types/sinon": "17.0.3",
-    "@types/html-validator": "5.0.3",
+    "@typescript-eslint/eslint-plugin": "8.13.0",
-    "@types/mock-fs": "4.13.1",
+    "@typescript-eslint/parser": "8.13.0",
-    "@types/node": "18.11.18",
+    "editorconfig-checker": "6.0.0",
-    "@types/tap": "15.0.7",
+    "eslint": "8.57.1",
-    "@typescript-eslint/eslint-plugin": "5.48.1",
+    "eslint-config-conventions": "16.0.1",
-    "editorconfig-checker": "4.0.2",
+    "eslint-plugin-promise": "7.1.0",
-    "eslint": "8.31.0",
+    "eslint-plugin-unicorn": "55.0.0",
-    "eslint-config-conventions": "6.0.0",
+    "execa": "9.5.1",
-    "eslint-config-prettier": "8.6.0",
+    "prettier": "3.3.3",
-    "eslint-plugin-import": "2.26.0",
+    "semantic-release": "23.1.1",
-    "eslint-plugin-prettier": "4.2.1",
+    "serve": "14.2.4",
-    "eslint-plugin-promise": "6.1.1",
+    "sinon": "19.0.2",
-    "eslint-plugin-unicorn": "45.0.2",
+    "typescript": "5.6.3"
-    "execa": "6.1.0",
-    "lint-staged": "13.1.0",
-    "markdownlint-cli2": "0.6.0",
-    "markdownlint-rule-relative-links": "1.1.1",
-    "mock-fs": "5.2.0",
-    "prettier": "2.8.2",
-    "rimraf": "3.0.2",
-    "semantic-release": "20.0.2",
-    "serve": "14.1.2",
-    "tap": "16.3.3",
-    "typescript": "4.9.4"
   }
 }

schema/schema.json

@@ -0,0 +1,48 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "html-w3c-validator://config/schema.json",
+  "title": "html-w3c-validator configuration schema",
+  "type": "object",
+  "properties": {
+    "$schema": {
+      "description": "JSON Schema",
+      "type": "string"
+    },
+    "urls": {
+      "description": "URLs to validate.",
+      "type": "array",
+      "default": [],
+      "minItems": 1,
+      "items": {
+        "description": "URL to validate.",
+        "type": "string",
+        "format": "uri",
+        "minLength": 1
+      }
+    },
+    "files": {
+      "description": "Files to validate.",
+      "type": "array",
+      "minItems": 1,
+      "default": [],
+      "items": {
+        "description": "File to validate.",
+        "type": "string",
+        "format": "uri-reference",
+        "minLength": 1
+      }
+    },
+    "severities": {
+      "description": "Specify the severities to report.",
+      "type": "array",
+      "minItems": 1,
+      "default": ["warning", "error"],
+      "items": {
+        "description": "Severity to report.",
+        "type": "string",
+        "enum": ["error", "warning", "info"]
+      }
+    }
+  },
+  "additionalProperties": false
+}

src/HTMLValidatorCommand.ts

@@ -1,25 +1,26 @@
-import path from 'node:path'
+import fs from "node:fs"
-import fs from 'node:fs'
+import path from "node:path"
 
-import { Command } from 'clipanion'
+import chalk from "chalk"
-import chalk from 'chalk'
+import { Command, Option } from "clipanion"
-import ora from 'ora'
+import logSymbols from "log-symbols"
-import logSymbols from 'log-symbols'
+import ora from "ora"
-import type {
+import { table } from "table"
-  ValidationMessageLocationObject,
+import * as typanion from "typanion"
-  ParsedJsonAsValidationResults
-} from 'html-validator'
-import validateHTML from 'html-validator'
-import { table } from 'table'
 
-import { isExistingPath } from './utils/isExistingPath.js'
+import type { ValidateHTMLResult } from "./validateHTML.js"
+import { getHTMLFromURL, validateHTML } from "./validateHTML.js"
 
-const CURRENT_DIRECTORY = process.cwd()
+export const CONFIG_FILE_NAME = ".html-w3c-validatorrc.json"
-const CONFIG_FILE_NAME = '.html-w3c-validatorrc.json'
+
+export const SEVERITIES = ["error", "warning", "info"] as const
+
+export type Severity = (typeof SEVERITIES)[number]
 
 interface Config {
   urls?: string[]
   files?: string[]
+  severities?: Severity[]
 }
 
 interface Error {
@@ -45,48 +46,84 @@ const printResults = (results: Result[]): void => {
 export class HTMLValidatorCommand extends Command {
   static override usage = {
     description:
-      'CLI for validating multiple html pages using <https://validator.w3.org/>.'
+      "CLI for validating HTML pages using <https://validator.w3.org/>.",
   }
 
+  public currentWorkingDirectory = Option.String(
+    "--current-working-directory",
+    process.cwd(),
+    {
+      description: "The current working directory.",
+      validator: typanion.isString(),
+    },
+  )
+
   public async execute(): Promise<number> {
-    const configPath = path.join(CURRENT_DIRECTORY, CONFIG_FILE_NAME)
+    const configPath = path.join(this.currentWorkingDirectory, CONFIG_FILE_NAME)
     try {
-      if (!(await isExistingPath(configPath))) {
+      let configData: string
+      try {
+        configData = await fs.promises.readFile(configPath, {
+          encoding: "utf-8",
+        })
+      } catch {
         throw new Error(
-          `No config file found at ${configPath}. Please create ${CONFIG_FILE_NAME}.`
+          `No config file found at ${configPath}. Please create "${CONFIG_FILE_NAME}".`,
         )
       }
-      const configData = await fs.promises.readFile(configPath, {
-        encoding: 'utf-8'
-      })
       let config: Config = { urls: [], files: [] }
-      let isValidConfig = true
       try {
         config = JSON.parse(configData)
       } catch {
-        isValidConfig = false
-      }
-      isValidConfig =
-        isValidConfig &&
-        (Array.isArray(config.urls) || Array.isArray(config.urls))
-      if (!isValidConfig) {
         throw new Error(
-          `Invalid config file at ${configPath}. Please check the syntax.`
+          `Invalid config file at "${configPath}". Please check the JSON syntax.`,
+        )
+      }
+      if (config.urls != null && !Array.isArray(config.urls)) {
+        throw new Error(
+          `Invalid config file at "${configPath}". Please include an array of URLs.`,
+        )
+      }
+      if (config.files != null && !Array.isArray(config.files)) {
+        throw new Error(
+          `Invalid config file at "${configPath}". Please include an array of files.`,
         )
       }
       const urls =
         config.urls == null
           ? []
           : config.urls.map((url) => {
-              return { type: 'url', data: url }
+              return { type: "url", data: url }
             })
       const files =
         config.files == null
           ? []
           : config.files.map((file) => {
-              return { type: 'file', data: file }
+              return { type: "file", data: file }
             })
       const dataToValidate = [...urls, ...files]
+      if (dataToValidate.length === 0) {
+        throw new Error(
+          `Invalid config file at "${configPath}". Please add URLs or files.`,
+        )
+      }
+      const severities: Severity[] = config.severities ?? ["warning", "error"]
+      for (const severity of severities) {
+        if (!SEVERITIES.includes(severity)) {
+          throw new Error(
+            `Invalid config file at "${configPath}". Please add valid severities (${SEVERITIES.join(
+              ", ",
+            )}).`,
+          )
+        }
+      }
+      if (severities.length === 0) {
+        throw new Error(
+          `Invalid config file at "${configPath}". Please add valid severities (${SEVERITIES.join(
+            ", ",
+          )}).`,
+        )
+      }
       const errors: Error[] = []
       let isValid = true
       const loader = ora(`Validating HTML (W3C)...`).start()
@@ -94,35 +131,34 @@ export class HTMLValidatorCommand extends Command {
       await Promise.all(
         dataToValidate.map(async ({ data, type }) => {
           try {
-            const options = {
+            let result: ValidateHTMLResult | undefined
-              format: 'json' as 'json' | undefined
+            if (type === "url") {
-            }
-            let result: ParsedJsonAsValidationResults | undefined
-            if (type === 'url') {
               result = await validateHTML({
-                url: data,
+                htmlData: await getHTMLFromURL(data),
-                isLocal: true,
-                ...options
               })
-            } else if (type === 'file') {
+            } else if (type === "file") {
-              const htmlPath = path.resolve(CURRENT_DIRECTORY, data)
+              const htmlPath = path.resolve(this.currentWorkingDirectory, data)
-              if (!(await isExistingPath(htmlPath))) {
+              let html: string
+              try {
+                html = await fs.promises.readFile(htmlPath, {
+                  encoding: "utf-8",
+                })
+              } catch {
                 throw new Error(
-                  `No file found at ${htmlPath}. Please check the path.`
+                  `No file found at "${htmlPath}". Please check the path.`,
                 )
               }
-              const html = await fs.promises.readFile(htmlPath, {
-                encoding: 'utf-8'
-              })
               result = await validateHTML({
-                data: html,
+                htmlData: html,
-                ...options
               })
             } else {
-              throw new Error('Invalid type')
+              throw new Error("Invalid type")
             }
             const hasErrors = result.messages.some((message) => {
-              return message.type === 'error'
+              return (
+                severities.includes(message.type as Severity) ||
+                severities.includes(message.subType as Severity)
+              )
             })
             if (!hasErrors) {
               results.push({ data, isSuccess: true })
@@ -130,19 +166,38 @@ export class HTMLValidatorCommand extends Command {
               results.push({ data, isSuccess: false })
               const messagesTable: string[][] = []
               for (const message of result.messages) {
-                if (message.type === 'error') {
+                if (
+                  !severities.includes(message.type as Severity) &&
+                  !severities.includes(message.subType as Severity)
+                ) {
+                  continue
+                }
+
                 const row: string[] = []
+                if (message.type === "info") {
+                  if (message.subType === "warning") {
+                    row.push(chalk.yellow(message.subType))
+                  } else {
+                    row.push(chalk.blue(message.type))
+                  }
+                } else {
                   row.push(chalk.red(message.type))
+                }
                 row.push(message.message)
-                  const violation = message as ValidationMessageLocationObject
+                if (
-                  if (violation.extract != null) {
+                  message.extract != null &&
+                  message.lastLine != null &&
+                  message.firstColumn != null &&
+                  message.lastColumn != null
+                ) {
                   row.push(
-                      `line: ${violation.lastLine}, column: ${violation.firstColumn}-${violation.lastColumn}`
+                    `line: ${message.lastLine}, column: ${message.firstColumn}-${message.lastColumn}`,
                   )
+                } else {
+                  row.push("")
                 }
                 messagesTable.push(row)
               }
-              }
               errors.push({ data, messagesTable })
               isValid = false
             }
@@ -153,7 +208,7 @@ export class HTMLValidatorCommand extends Command {
               errors.push({ data, messagesTable })
             }
           }
-        })
+        }),
       )
       if (!isValid) {
         loader.fail()
@@ -161,22 +216,22 @@ export class HTMLValidatorCommand extends Command {
         for (const error of errors) {
           console.error(`\n${error.data}`)
           console.error(table(error.messagesTable))
-          console.error('------------------------------')
+          console.error("------------------------------")
         }
         console.error()
-        throw new Error('HTML validation (W3C) failed!')
+        throw new Error("HTML validation (W3C) failed!")
       }
       loader.succeed(
-        `${chalk.bold.green('Success:')} HTML validation (W3C) passed! 🎉`
+        `${chalk.bold.green("Success:")} HTML validation (W3C) passed! 🎉`,
       )
       printResults(results)
       return 0
     } catch (error) {
       if (error instanceof Error) {
-        console.error(`${chalk.bold.red('Error:')} ${error.message}`)
+        console.error(`${chalk.bold.red("Error:")} ${error.message}`)
       } else {
         console.error(
-          `${chalk.bold.red('Error:')} HTML validation (W3C) failed!`
+          `${chalk.bold.red("Error:")} HTML validation (W3C) failed!`,
         )
       }
       return 1

src/__test__/HTMLValidatorCommand.test.ts

@@ -1,21 +1,468 @@
-import tap from 'tap'
+import test from "node:test"
-import { execa } from 'execa'
+import assert from "node:assert/strict"
+import path from "node:path"
+import fs from "node:fs"
+import { PassThrough } from "node:stream"
+import { fileURLToPath } from "node:url"
 
-import { cli } from '../cli.js'
+import sinon from "sinon"
-import { HTMLValidatorCommand } from '../HTMLValidatorCommand.js'
+import { execa } from "execa"
+import { table } from "table"
+import chalk from "chalk"
+import logSymbols from "log-symbols"
 
-await tap.test('html-w3c-validator', async (t) => {
+import { cli } from "../cli.js"
-  await t.test('should be instance of the command', async (t) => {
+import {
+  HTMLValidatorCommand,
+  CONFIG_FILE_NAME,
+  SEVERITIES,
+} from "../HTMLValidatorCommand.js"
+
+const FIXTURES_PATH = path.join(process.cwd(), "src", "__test__", "fixtures")
+
+await test("html-w3c-validator", async (t) => {
+  t.afterEach(() => {
+    sinon.restore()
+  })
+
+  await t.test("should be instance of the command", async () => {
     const command = cli.process([])
-    t.equal(command instanceof HTMLValidatorCommand, true)
+    assert(command instanceof HTMLValidatorCommand)
   })
 
-  await t.test('succeeds and validate the html correctly', async (t) => {
+  await t.test(
-    const exampleURL = new URL('../../example', import.meta.url)
+    "succeeds and validate the html correctly (example)",
+    async () => {
+      const exampleURL = new URL("../../example", import.meta.url)
       process.chdir(exampleURL.pathname)
-    await execa('rimraf', ['node_modules'])
+      await fs.promises.rm(
-    await execa('npm', ['install'])
+        path.join(fileURLToPath(exampleURL), "node_modules"),
-    const { exitCode } = await execa('npm', ['run', 'test:html-w3c-validator'])
+        { recursive: true, force: true },
-    t.equal(exitCode, 0)
+      )
+      await execa("npm", ["install"])
+      const { exitCode } = await execa("node", [
+        "--run",
+        "test:html-w3c-validator",
+      ])
+      assert.strictEqual(exitCode, 0)
+    },
+  )
+
+  await t.test(
+    "succeeds and validate the html correctly (example without working directory)",
+    async () => {
+      const logs: string[] = []
+      sinon.stub(console, "log").value((...log: string[]) => {
+        logs.push(...log)
+      })
+      const consoleLogSpy = sinon.spy(console, "log")
+      const stream = new PassThrough()
+      const exitCode = await cli.run([], {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      })
+      stream.end()
+      assert.strictEqual(exitCode, 0, logs.join("\n"))
+      assert.strictEqual(
+        consoleLogSpy.calledWith(
+          logSymbols.success,
+          "./example/build/index.html",
+        ),
+        true,
+        logs.join("\n"),
+      )
+      assert.strictEqual(
+        consoleLogSpy.calledWith(
+          logSymbols.success,
+          "./example/build/about.html",
+        ),
+        true,
+        logs.join("\n"),
+      )
+    },
+  )
+
+  await t.test(
+    "succeeds and validate the html correctly (fixture)",
+    async () => {
+      const workingDirectory = path.join(FIXTURES_PATH, "success")
+      const logs: string[] = []
+      sinon.stub(console, "log").value((...log: string[]) => {
+        logs.push(...log)
+      })
+      const consoleLogSpy = sinon.spy(console, "log")
+      const stream = new PassThrough()
+      const exitCode = await cli.run(
+        [`--current-working-directory=${workingDirectory}`],
+        {
+          stdin: process.stdin,
+          stdout: stream,
+          stderr: stream,
+        },
+      )
+      stream.end()
+      assert.strictEqual(exitCode, 0, logs.join("\n"))
+      assert.strictEqual(
+        consoleLogSpy.calledWith(logSymbols.success, "./build/index.html"),
+        true,
+        logs.join("\n"),
+      )
+      assert.strictEqual(
+        consoleLogSpy.calledWith(logSymbols.success, "./build/about.html"),
+        true,
+        logs.join("\n"),
+      )
+    },
+  )
+
+  await t.test(
+    "fails by validating the html correctly with 2 errors: one with line/column, the other without (GitHub issue #6)",
+    async () => {
+      const workingDirectory = path.join(FIXTURES_PATH, "issue-6")
+      const errors: string[] = []
+      sinon.stub(console, "error").value((error: string) => {
+        errors.push(error)
+      })
+      const consoleErrorSpy = sinon.spy(console, "error")
+      const stream = new PassThrough()
+      const exitCode = await cli.run(
+        [`--current-working-directory=${workingDirectory}`],
+        {
+          stdin: process.stdin,
+          stdout: stream,
+          stderr: stream,
+        },
+      )
+      stream.end()
+      assert.strictEqual(exitCode, 1)
+      const messagesTable = [
+        [
+          chalk.red("error"),
+          "The character encoding was not declared. Proceeding using “windows-1252”.",
+          "",
+        ],
+        [
+          chalk.yellow("warning"),
+          "Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.",
+          "line: 2, column: 16-7",
+        ],
+      ]
+      assert.strictEqual(
+        consoleErrorSpy.calledWith(
+          chalk.bold.red("Error:") + " HTML validation (W3C) failed!",
+        ),
+        true,
+        errors.join("\n"),
+      )
+      assert.strictEqual(
+        consoleErrorSpy.calledWith(table(messagesTable)),
+        true,
+        errors.join("\n"),
+      )
+    },
+  )
+
+  await t.test("fails with not found config", async () => {
+    const workingDirectory = path.join(FIXTURES_PATH, "error-config-not-found")
+    const configPath = path.join(workingDirectory, CONFIG_FILE_NAME)
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") +
+          ` No config file found at ${configPath}. Please create "${CONFIG_FILE_NAME}".`,
+      ),
+      true,
+      errors.join("\n"),
+    )
+  })
+
+  await t.test("fails with invalid JSON config", async () => {
+    const workingDirectory = path.join(
+      FIXTURES_PATH,
+      "error-config-invalid-json",
+    )
+    const configPath = path.join(workingDirectory, CONFIG_FILE_NAME)
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") +
+          ` Invalid config file at "${configPath}". Please check the JSON syntax.`,
+      ),
+      true,
+      errors.join("\n"),
+    )
+  })
+
+  await t.test("fails with invalid URLs config", async () => {
+    const workingDirectory = path.join(
+      FIXTURES_PATH,
+      "error-config-invalid-urls",
+    )
+    const configPath = path.join(workingDirectory, CONFIG_FILE_NAME)
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") +
+          ` Invalid config file at "${configPath}". Please include an array of URLs.`,
+      ),
+      true,
+      errors.join("\n"),
+    )
+  })
+
+  await t.test("fails with invalid files config", async () => {
+    const workingDirectory = path.join(
+      FIXTURES_PATH,
+      "error-config-invalid-files",
+    )
+    const configPath = path.join(workingDirectory, CONFIG_FILE_NAME)
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") +
+          ` Invalid config file at "${configPath}". Please include an array of files.`,
+      ),
+      true,
+      errors.join("\n"),
+    )
+  })
+
+  await t.test("fails with invalid files and urls config", async () => {
+    const workingDirectory = path.join(
+      FIXTURES_PATH,
+      "error-config-invalid-files-and-urls",
+    )
+    const configPath = path.join(workingDirectory, CONFIG_FILE_NAME)
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") +
+          ` Invalid config file at "${configPath}". Please add URLs or files.`,
+      ),
+      true,
+      errors.join("\n"),
+    )
+  })
+
+  await t.test("fails with invalid severities config", async () => {
+    const workingDirectory = path.join(
+      FIXTURES_PATH,
+      "error-config-invalid-severities",
+    )
+    const configPath = path.join(workingDirectory, CONFIG_FILE_NAME)
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") +
+          ` Invalid config file at "${configPath}". Please add valid severities (${SEVERITIES.join(
+            ", ",
+          )}).`,
+      ),
+      true,
+      errors.join("\n"),
+    )
+  })
+
+  await t.test("fails with invalid empty severities config", async () => {
+    const workingDirectory = path.join(
+      FIXTURES_PATH,
+      "error-config-invalid-severities-empty",
+    )
+    const configPath = path.join(workingDirectory, CONFIG_FILE_NAME)
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") +
+          ` Invalid config file at "${configPath}". Please add valid severities (${SEVERITIES.join(
+            ", ",
+          )}).`,
+      ),
+      true,
+      errors.join("\n"),
+    )
+  })
+
+  await t.test("fails with invalid files paths to check", async () => {
+    const workingDirectory = path.join(
+      FIXTURES_PATH,
+      "error-invalid-files-paths-to-check",
+    )
+    const htmlPath = path.resolve(workingDirectory, "index.html")
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    const messagesTable = [
+      [`No file found at "${htmlPath}". Please check the path.`],
+    ]
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") + " HTML validation (W3C) failed!",
+      ),
+      true,
+      errors.join("\n"),
+    )
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(table(messagesTable)),
+      true,
+      errors.join("\n"),
+    )
+  })
+
+  await t.test("fails with invalid W3C HTML", async () => {
+    const workingDirectory = path.join(FIXTURES_PATH, "error-invalid-w3c-html")
+    const errors: string[] = []
+    sinon.stub(console, "error").value((error: string) => {
+      errors.push(error)
+    })
+    const consoleErrorSpy = sinon.spy(console, "error")
+    const stream = new PassThrough()
+    const exitCode = await cli.run(
+      [`--current-working-directory=${workingDirectory}`],
+      {
+        stdin: process.stdin,
+        stdout: stream,
+        stderr: stream,
+      },
+    )
+    stream.end()
+    assert.strictEqual(exitCode, 1)
+    const messagesTable = [
+      [
+        chalk.yellow("warning"),
+        "Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.",
+        "line: 2, column: 16-6",
+      ],
+    ]
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(
+        chalk.bold.red("Error:") + " HTML validation (W3C) failed!",
+      ),
+      true,
+      errors.join("\n"),
+    )
+    assert.strictEqual(
+      consoleErrorSpy.calledWith(table(messagesTable)),
+      true,
+      errors.join("\n"),
+    )
   })
 })

src/__test__/fixtures/error-config-invalid-files-and-urls/.html-w3c-validatorrc.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "urls": [],
+  "files": []
+}

src/__test__/fixtures/error-config-invalid-files/.html-w3c-validatorrc.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "files": "Invalid"
+}

src/__test__/fixtures/error-config-invalid-json/.html-w3c-validatorrc.json

@@ -0,0 +1 @@
+Invalid JSON

src/__test__/fixtures/error-config-invalid-severities-empty/.html-w3c-validatorrc.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "files": ["./index.html"],
+  "severities": []
+}

src/__test__/fixtures/error-config-invalid-severities-empty/index.html

@@ -0,0 +1,9 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Home</title>
+  </head>
+  <body></body>
+</html>

src/__test__/fixtures/error-config-invalid-severities/.html-w3c-validatorrc.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "files": ["./index.html"],
+  "severities": ["errors-invalid"]
+}

src/__test__/fixtures/error-config-invalid-severities/index.html

@@ -0,0 +1,9 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Home</title>
+  </head>
+  <body></body>
+</html>

src/__test__/fixtures/error-config-invalid-urls/.html-w3c-validatorrc.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "urls": "Invalid"
+}

src/__test__/fixtures/error-invalid-files-paths-to-check/.html-w3c-validatorrc.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "files": ["./index.html"]
+}

src/__test__/fixtures/error-invalid-w3c-html/.html-w3c-validatorrc.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "files": ["./build/index.html", "./build/about.html"]
+}

src/__test__/fixtures/error-invalid-w3c-html/build/about.html

@@ -0,0 +1,9 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>About</title>
+  </head>
+  <body></body>
+</html>

src/__test__/fixtures/error-invalid-w3c-html/build/index.html

@@ -0,0 +1,9 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Home</title>
+  </head>
+  <body></body>
+</html>

src/__test__/fixtures/issue-6/.html-w3c-validatorrc.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "files": ["./build/index.html"],
+  "severities": ["info", "warning", "error"]
+}

src/__test__/fixtures/issue-6/build/index.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<title>Have We Stopped Killing Yet?</title>
+<link rel=icon href=favicon.ico>
+<link rel=stylesheet href=setup/default.css>
+<meta name=viewport content="initial-scale=1,width=device-width">
+<meta property="og:image" content="https://mirrors.meiert.org/havewestoppedkillingyet.org/media/redrum.png">
+<h1>Have We Stopped Killing Yet?</h1>
+<p><strong>No.</strong>
+<p>This is <a href=https://meiert.com/en/blog/on-taking-life/>unacceptable</a>.
+<p>We don’t need arms and armies and industrial slaughterhouses.
+<p>We need respect for life.
+<p>Everyone can <em>do something</em>. Speaking up is doing something. <a href=https://meiert.com/en/><img src=https://hell.meiert.org/core/png/meiert-logo-80x80-alt.png alt="Jens Oliver Meiert"></a>

src/__test__/fixtures/success/.html-w3c-validatorrc.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "../../../../schema/schema.json",
+  "files": ["./build/index.html", "./build/about.html"]
+}

src/__test__/fixtures/success/build/about.html

@@ -0,0 +1,9 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>About</title>
+  </head>
+  <body></body>
+</html>

src/__test__/fixtures/success/build/index.html

@@ -0,0 +1,9 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Home</title>
+  </head>
+  <body></body>
+</html>

src/cli.ts

@@ -1,12 +1,12 @@
-import { Builtins, Cli } from 'clipanion'
+import { Builtins, Cli } from "clipanion"
 
-import { HTMLValidatorCommand } from './HTMLValidatorCommand.js'
+import { HTMLValidatorCommand } from "./HTMLValidatorCommand.js"
-import { packageJSON } from './packageJSON.js'
+import { packageJSON } from "./packageJSON.js"
 
 export const cli = new Cli({
   binaryLabel: packageJSON.name,
   binaryName: packageJSON.name,
-  binaryVersion: packageJSON.version
+  binaryVersion: packageJSON.version,
 })
 cli.register(Builtins.HelpCommand)
 cli.register(Builtins.VersionCommand)

src/index.ts

@@ -1,7 +1,7 @@
 #!/usr/bin/env node
-import { Cli } from 'clipanion'
+import { Cli } from "clipanion"
 
-import { cli } from './cli.js'
+import { cli } from "./cli.js"
 
 const [, , ...arguments_] = process.argv
 

src/packageJSON.ts

@@ -1,5 +1,5 @@
-import { readPackage } from 'read-pkg'
+import { readPackage } from "read-pkg"
 
 export const packageJSON = await readPackage({
-  cwd: new URL('..', import.meta.url)
+  cwd: new URL("..", import.meta.url),
 })

src/utils/__test__/isExistingPath.test.ts

@@ -1,24 +0,0 @@
-import fsMock from 'mock-fs'
-import tap from 'tap'
-
-import { isExistingPath } from '../isExistingPath.js'
-
-await tap.test('utils/isExistingPath', async (t) => {
-  t.afterEach(() => {
-    fsMock.restore()
-  })
-
-  await t.test('should return true if the file exists', async () => {
-    fsMock({
-      '/file.txt': ''
-    })
-    t.equal(await isExistingPath('/file.txt'), true)
-  })
-
-  await t.test("should return false if the file doesn't exists", async () => {
-    fsMock({
-      '/file.txt': ''
-    })
-    t.equal(await isExistingPath('/randomfile.txt'), false)
-  })
-})

src/utils/isExistingPath.ts

@@ -1,10 +0,0 @@
-import fs from 'node:fs'
-
-export const isExistingPath = async (path: string): Promise<boolean> => {
-  try {
-    await fs.promises.access(path, fs.constants.F_OK)
-    return true
-  } catch {
-    return false
-  }
-}

src/validateHTML.ts

@@ -0,0 +1,46 @@
+export interface ValidateHTMLOptions {
+  htmlData: string
+}
+
+export interface ValidationMessage {
+  type: "error" | "info" | "non-document-error"
+  subType?: "warning" | "fatal" | "internal" | "io" | "schema"
+  message: string
+  extract?: string
+  lastLine?: number
+  firstColumn?: number
+  lastColumn?: number
+}
+
+export interface ValidateHTMLResult {
+  messages: ValidationMessage[]
+}
+
+export const validateHTML = async (
+  options: ValidateHTMLOptions,
+): Promise<ValidateHTMLResult> => {
+  const { htmlData } = options
+  const url = new URL("https://validator.w3.org/nu/")
+  url.searchParams.set("out", "json")
+  const response = await fetch(url, {
+    method: "POST",
+    body: htmlData,
+    headers: {
+      "Content-Type": "text/html",
+    },
+  })
+  if (!response.ok) {
+    throw new Error(response.statusText)
+  }
+  const result = (await response.json()) as ValidateHTMLResult
+  return result
+}
+
+export const getHTMLFromURL = async (url: string): Promise<string> => {
+  const response = await fetch(url)
+  if (!response.ok) {
+    throw new Error(`Failed to fetch HTML from "${url}"`)
+  }
+  const html = await response.text()
+  return html
+}

tsconfig.json

@@ -2,12 +2,13 @@
   "extends": "@tsconfig/strictest/tsconfig.json",
   "compilerOptions": {
     "target": "ESNext",
-    "module": "ESNext",
     "lib": ["ESNext"],
-    "moduleResolution": "node",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
     "outDir": "./build",
     "rootDir": "./src",
     "noEmit": true,
-    "exactOptionalPropertyTypes": false
+    "exactOptionalPropertyTypes": false,
+    "checkJs": false
   }
 }