Cleanup tests and prettify all source.

Added ESLint and Prettier and made the code mostly obey.
This necessitated finally fixing the text OCR in the spec, which turns out to be a matter of making it easy on Tesseract by emitting the text in monospace (since we're really not testing OCR!) here.

.eslintrc.js

@@ -0,0 +1,18 @@
+module.exports = {
+    env: {
+        browser: true,
+        es2021: true,
+    },
+    extends: 'eslint:recommended',
+    overrides: [],
+    parserOptions: {
+        ecmaVersion: 'latest',
+        sourceType: 'module',
+    },
+    rules: {
+        'indent': ['error', 4],
+        'linebreak-style': ['error', 'unix'],
+        'quotes': ['error', 'single'],
+        'semi': ['error', 'always'],
+    },
+};

.github/ISSUE_TEMPLATE.md

@@ -1,14 +1,14 @@
-### Use case: description, code  
+# Use case: description, code
 
 [jsfiddle](https://jsfiddle.net/IDisposable/emjL1ow8/)
 
-### Expected behavior
+## Expected behavior
 
-### Actual behavior (stack traces, console logs etc)
+## Actual behavior (stack traces, console logs etc)
 
-### Library version
+## Library version
 
-### Browsers
+## Browsers
 
-- [ ] Chrome 49+  
-- [ ] Firefox 45+  
+-   [ ] Chrome 49+
+-   [ ] Firefox 45+

.github/workflows/codeql-analysis-v2.yml

@@ -9,68 +9,67 @@
 # the `language` matrix defined below to confirm you have the correct set of
 # supported CodeQL languages.
 #
-name: "CodeQL"
+name: 'CodeQL'
 
 on:
-  push:
-    branches: [ "master" ]
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [ "master" ]
-  schedule:
-    - cron: '17 11 * * 1'
+    push:
+        branches: ['master']
+    pull_request:
+        # The branches below must be a subset of the branches above
+        branches: ['master']
+    schedule:
+        - cron: '17 11 * * 1'
 
 jobs:
-  analyze:
-    name: Analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read
-      contents: read
-      security-events: write
+    analyze:
+        name: Analyze
+        runs-on: ubuntu-latest
+        permissions:
+            actions: read
+            contents: read
+            security-events: write
 
-    strategy:
-      fail-fast: false
-      matrix:
-        language: [ 'javascript' ]
-        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
-        # Use only 'java' to analyze code written in Java, Kotlin or both
-        # Use only 'javascript' to analyze code written in JavaScript, TypeScript or both
-        # Learn more about CodeQL language support at https://aka.ms/codeql-docs/language-support
+        strategy:
+            fail-fast: false
+            matrix:
+                language: ['javascript']
+                # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
+                # Use only 'java' to analyze code written in Java, Kotlin or both
+                # Use only 'javascript' to analyze code written in JavaScript, TypeScript or both
+                # Learn more about CodeQL language support at https://aka.ms/codeql-docs/language-support
 
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v3
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@v3
 
-    # Initializes the CodeQL tools for scanning.
-    - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
-      with:
-        languages: ${{ matrix.language }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file.
-        # Prefix the list here with "+" to use these queries and those in the config file.
+            # Initializes the CodeQL tools for scanning.
+            - name: Initialize CodeQL
+              uses: github/codeql-action/init@v2
+              with:
+                  languages: ${{ matrix.language }}
+                  # If you wish to specify custom queries, you can do so here or in a config file.
+                  # By default, queries listed here will override any specified in a config file.
+                  # Prefix the list here with "+" to use these queries and those in the config file.
 
-        # Details on CodeQL's query packs refer to : https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
-        # queries: security-extended,security-and-quality
+                  # Details on CodeQL's query packs refer to : https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
+                  # queries: security-extended,security-and-quality
 
+            # Autobuild attempts to build any compiled languages  (C/C++, C#, Go, or Java).
+            # If this step fails, then you should remove it and run the build manually (see below)
+            - name: Autobuild
+              uses: github/codeql-action/autobuild@v2
 
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, Go, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
+            # ℹ️ Command-line programs to run using the OS shell.
+            # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
 
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+            #   If the Autobuild fails above, remove it and uncomment the following three lines.
+            #   modify them (or add more) to build your code if your project, please refer to the EXAMPLE below for guidance.
 
-    #   If the Autobuild fails above, remove it and uncomment the following three lines.
-    #   modify them (or add more) to build your code if your project, please refer to the EXAMPLE below for guidance.
+            # - run: |
+            #   echo "Run, Build Application using script"
+            #   ./location_of_script_within_repo/buildscript.sh
 
-    # - run: |
-    #   echo "Run, Build Application using script"
-    #   ./location_of_script_within_repo/buildscript.sh
-
-    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
-      with:
-        category: "/language:${{matrix.language}}"
+            - name: Perform CodeQL Analysis
+              uses: github/codeql-action/analyze@v2
+              with:
+                  category: '/language:${{matrix.language}}'

.markdownlink.json

@@ -0,0 +1,9 @@
+{
+    "list-marker-space": {
+        "ul_multi": 3,
+        "ul_single": 3
+    },
+    "ul-indent": {
+        "indent": 4
+    }
+}

.prettierignore

@@ -0,0 +1,2 @@
+test-lib/
+dist/

.prettierrc

@@ -0,0 +1,11 @@
+{
+    "singleQuote": true,
+    "semi": true,
+    "trailingComma": "es5",
+    "quoteProps": "consistent",
+    "bracketSpacing": true,
+    "arrowParens": "always",
+    "endOfLine": "lf",
+    "tabWidth": 4,
+    "printWidth": 90
+}

.stylelintrc

@@ -2,4 +2,4 @@
     "rules": {
         "indentation": 4
     }
-}
+}

Gruntfile.js

@@ -1,35 +1,34 @@
-module.exports = function(grunt) {
-
+module.exports = function (grunt) {
     grunt.initConfig({
         pkg: grunt.file.readJSON('package.json'),
         jshint: {
             files: ['Gruntfile.js', 'src/**/*.js', 'spec/**/*.js'],
             options: {
-                jshintrc: true
-            }
+                jshintrc: true,
+            },
         },
         karma: {
             unit: {
                 configFile: 'karma.conf.js',
                 background: false,
-                singleRun: true
-            }
+                singleRun: true,
+            },
         },
         uglify: {
             options: {
                 banner: '/*! <%= pkg.name %> <%= grunt.template.today("dd-mm-yyyy") %> */\n',
-                sourceMap: true
+                sourceMap: true,
             },
             dist: {
                 files: {
-                    'dist/<%= pkg.name %>.min.js': ['src/dom-to-image-more.js']
-                }
-            }
+                    'dist/<%= pkg.name %>.min.js': ['src/dom-to-image-more.js'],
+                },
+            },
         },
         watch: {
             files: ['<%= jshint.files %>'],
-            tasks: ['test']
-        }
+            tasks: ['test'],
+        },
     });
 
     grunt.loadNpmTasks('grunt-contrib-jshint');
@@ -39,4 +38,4 @@ module.exports = function(grunt) {
 
     grunt.registerTask('test', ['karma']);
     grunt.registerTask('default', ['jshint', 'test', 'uglify']);
-};
+};