feat: add svelte/no-restricted-html-elements rule

.changeset/wise-flies-lay.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-svelte": minor
+---
+
+feat: add `no-restricted-html-elements` rule

README.md

@@ -367,6 +367,7 @@ These rules relate to style guidelines, and are therefore quite subjective:
 | [svelte/max-attributes-per-line](https://sveltejs.github.io/eslint-plugin-svelte/rules/max-attributes-per-line/) | enforce the maximum number of attributes per line | :wrench: |
 | [svelte/mustache-spacing](https://sveltejs.github.io/eslint-plugin-svelte/rules/mustache-spacing/) | enforce unified spacing in mustache | :wrench: |
 | [svelte/no-extra-reactive-curlies](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-extra-reactive-curlies/) | disallow wrapping single reactive statements in curly braces | :bulb: |
+| [svelte/no-restricted-html-elements](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-restricted-html-elements/) | disallow specific HTML elements |  |
 | [svelte/no-spaces-around-equal-signs-in-attribute](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-spaces-around-equal-signs-in-attribute/) | disallow spaces around equal signs in attribute | :wrench: |
 | [svelte/prefer-class-directive](https://sveltejs.github.io/eslint-plugin-svelte/rules/prefer-class-directive/) | require class directives instead of ternary expressions | :wrench: |
 | [svelte/prefer-style-directive](https://sveltejs.github.io/eslint-plugin-svelte/rules/prefer-style-directive/) | require style directives instead of style attribute | :wrench: |

docs/rules.md

@@ -80,6 +80,7 @@ These rules relate to style guidelines, and are therefore quite subjective:
 | [svelte/max-attributes-per-line](./rules/max-attributes-per-line.md)                                     | enforce the maximum number of attributes per line                                  | :wrench: |
 | [svelte/mustache-spacing](./rules/mustache-spacing.md)                                                   | enforce unified spacing in mustache                                                | :wrench: |
 | [svelte/no-extra-reactive-curlies](./rules/no-extra-reactive-curlies.md)                                 | disallow wrapping single reactive statements in curly braces                       | :bulb:   |
+| [svelte/no-restricted-html-elements](./rules/no-restricted-html-elements.md)                             | disallow specific HTML elements                                                    |          |
 | [svelte/no-spaces-around-equal-signs-in-attribute](./rules/no-spaces-around-equal-signs-in-attribute.md) | disallow spaces around equal signs in attribute                                    | :wrench: |
 | [svelte/prefer-class-directive](./rules/prefer-class-directive.md)                                       | require class directives instead of ternary expressions                            | :wrench: |
 | [svelte/prefer-style-directive](./rules/prefer-style-directive.md)                                       | require style directives instead of style attribute                                | :wrench: |

docs/rules/no-restricted-html-elements.md

@@ -0,0 +1,107 @@
+---
+pageClass: "rule-details"
+sidebarDepth: 0
+title: "svelte/no-restricted-html-elements"
+description: "disallow specific HTML elements"
+---
+
+# svelte/no-restricted-html-elements
+
+> disallow specific HTML elements
+
+- :exclamation: <badge text="This rule has not been released yet." vertical="middle" type="error"> **_This rule has not been released yet._** </badge>
+
+## :book: Rule Details
+
+This rule reports to usage of resticted HTML elements.
+
+<ESLintCodeBlock>
+
+<!--eslint-skip-->
+
+```svelte
+<script>
+  /* eslint svelte/no-restricted-html-elements: ["error", "h1", "h2", "h3", "h4", "h5", "h6"] */
+</script>
+
+<!-- ✓ GOOD -->
+<div>
+  <p>Hi!</p>
+</div>
+
+<!-- ✗ BAD -->
+<h1>foo</h1>
+
+<div>
+  <h2>bar</h2>
+</div>
+```
+
+</ESLintCodeBlock>
+
+---
+
+<ESLintCodeBlock>
+
+<!--eslint-skip-->
+
+```svelte
+<script>
+  /* eslint svelte/no-restricted-html-elements: ["error", { "elements": ["marquee"], "message": "Do not use deprecated HTML tags" }] */
+</script>
+
+<!-- ✓ GOOD -->
+<div>
+  <p>Hi!</p>
+</div>
+
+<!-- ✗ BAD -->
+<marquee>foo</marquee>
+
+<div>
+  <marquee>bar</marquee>
+</div>
+```
+
+</ESLintCodeBlock>
+
+## :wrench: Options
+
+This rule takes a list of strings, where each string is an HTML element name to be restricted:
+
+```json
+{
+  "svelte/no-restricted-html-elements": [
+    "error",
+    "h1",
+    "h2",
+    "h3",
+    "h4",
+    "h5",
+    "h6"
+  ]
+}
+```
+
+Alternatively, the rule also accepts objects.
+
+```json
+{
+  "svelte/no-restricted-html-elements": [
+    "error",
+    {
+      "elements": "h1", "h2", "h3", "h4", "h5", "h6",
+      "message": "Prefer use of our custom <Heading /> component"
+    },
+    {
+      "elements": ["marquee"],
+      "message": "Do not use deprecated HTML tags"
+    }
+  ]
+}
+```
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/sveltejs/eslint-plugin-svelte/blob/main/src/rules/no-restricted-html-elements.ts)
+- [Test source](https://github.com/sveltejs/eslint-plugin-svelte/blob/main/tests/src/rules/no-restricted-html-elements.ts)

src/rules/no-restricted-html-elements.ts

@@ -0,0 +1,63 @@
+import { createRule } from "../utils"
+
+export default createRule("no-restricted-html-elements", {
+  meta: {
+    docs: {
+      description: "disallow specific HTML elements",
+      category: "Stylistic Issues",
+      recommended: false,
+      conflictWithPrettier: false,
+    },
+    schema: {
+      type: "array",
+      items: {
+        oneOf: [
+          { type: "string" },
+          {
+            type: "object",
+            properties: {
+              elements: {
+                type: "array",
+                items: {
+                  type: ["string"],
+                },
+                uniqueItems: true,
+                minItems: 1,
+              },
+              message: { type: "string", minLength: 1 },
+            },
+            additionalProperties: false,
+            minItems: 1,
+          },
+        ],
+      },
+      uniqueItems: true,
+      minItems: 1,
+    },
+    messages: {},
+    type: "suggestion",
+  },
+  create(context) {
+    return {
+      SvelteElement(node) {
+        if (node.kind !== "html") return
+        const { name } = node
+        if (name.type !== "SvelteName") return
+        for (const option of context.options) {
+          const message =
+            option.message ||
+            `Unexpected use of forbidden HTML element ${name.name}.`
+          const elements = option.elements || [option]
+          for (const element of elements) {
+            if (element === name.name) {
+              context.report({
+                message,
+                node: node.startTag,
+              })
+            }
+          }
+        }
+      },
+    }
+  },
+})

src/utils/rules.ts

@@ -34,6 +34,7 @@ import noObjectInTextMustaches from "../rules/no-object-in-text-mustaches"
 import noReactiveFunctions from "../rules/no-reactive-functions"
 import noReactiveLiterals from "../rules/no-reactive-literals"
 import noReactiveReassign from "../rules/no-reactive-reassign"
+import noRestrictedHtmlElements from "../rules/no-restricted-html-elements"
 import noShorthandStylePropertyOverrides from "../rules/no-shorthand-style-property-overrides"
 import noSpacesAroundEqualSignsInAttribute from "../rules/no-spaces-around-equal-signs-in-attribute"
 import noStoreAsync from "../rules/no-store-async"
@@ -93,6 +94,7 @@ export const rules = [
   noReactiveFunctions,
   noReactiveLiterals,
   noReactiveReassign,
+  noRestrictedHtmlElements,
   noShorthandStylePropertyOverrides,
   noSpacesAroundEqualSignsInAttribute,
   noStoreAsync,

tests/fixtures/rules/no-restricted-html-elements/invalid/array-config.json

@@ -0,0 +1,3 @@
+{
+  "options": ["h1", "h2", "h3", "h4", "h5", "h6"]
+}

tests/fixtures/rules/no-restricted-html-elements/invalid/array-errors.yaml

@@ -0,0 +1,24 @@
+- message: Unexpected use of forbidden HTML element h1.
+  line: 1
+  column: 1
+  suggestions: null
+- message: Unexpected use of forbidden HTML element h2.
+  line: 2
+  column: 1
+  suggestions: null
+- message: Unexpected use of forbidden HTML element h3.
+  line: 3
+  column: 1
+  suggestions: null
+- message: Unexpected use of forbidden HTML element h4.
+  line: 4
+  column: 1
+  suggestions: null
+- message: Unexpected use of forbidden HTML element h5.
+  line: 5
+  column: 1
+  suggestions: null
+- message: Unexpected use of forbidden HTML element h6.
+  line: 6
+  column: 1
+  suggestions: null

tests/fixtures/rules/no-restricted-html-elements/invalid/array-input.svelte

@@ -0,0 +1,6 @@
+<h1>Main Title - H1</h1>
+<h2>Subtitle - H2</h2>
+<h3>Subsection Title - H3</h3>
+<h4>Sub-Subsection Title - H4</h4>
+<h5>Minor Title - H5</h5>
+<h6>Minor Subtitle - H6</h6>

tests/fixtures/rules/no-restricted-html-elements/invalid/object-config.json

@@ -0,0 +1,12 @@
+{
+  "options": [
+    {
+      "elements": ["h1", "h2", "h3", "h4", "h5", "h6"],
+      "message": "Prefer use of our custom <Heading /> component"
+    },
+    {
+      "elements": ["marquee"],
+      "message": "Do not use deprecated HTML tags"
+    }
+  ]
+}

tests/fixtures/rules/no-restricted-html-elements/invalid/object-errors.yaml

@@ -0,0 +1,48 @@
+- message: Prefer use of our custom <Heading /> component
+  line: 1
+  column: 1
+  suggestions: null
+- message: Prefer use of our custom <Heading /> component
+  line: 2
+  column: 1
+  suggestions: null
+- message: Prefer use of our custom <Heading /> component
+  line: 3
+  column: 1
+  suggestions: null
+- message: Prefer use of our custom <Heading /> component
+  line: 4
+  column: 1
+  suggestions: null
+- message: Prefer use of our custom <Heading /> component
+  line: 5
+  column: 1
+  suggestions: null
+- message: Prefer use of our custom <Heading /> component
+  line: 6
+  column: 1
+  suggestions: null
+- message: Do not use deprecated HTML tags
+  line: 8
+  column: 1
+  suggestions: null
+- message: Do not use deprecated HTML tags
+  line: 10
+  column: 1
+  suggestions: null
+- message: Do not use deprecated HTML tags
+  line: 12
+  column: 1
+  suggestions: null
+- message: Do not use deprecated HTML tags
+  line: 19
+  column: 3
+  suggestions: null
+- message: Do not use deprecated HTML tags
+  line: 23
+  column: 3
+  suggestions: null
+- message: Prefer use of our custom <Heading /> component
+  line: 27
+  column: 3
+  suggestions: null

tests/fixtures/rules/no-restricted-html-elements/invalid/object-input.svelte

@@ -0,0 +1,28 @@
+<h1>Main Title - H1</h1>
+<h2>Subtitle - H2</h2>
+<h3>Subsection Title - H3</h3>
+<h4>Sub-Subsection Title - H4</h4>
+<h5>Minor Title - H5</h5>
+<h6>Minor Subtitle - H6</h6>
+
+<marquee>This text will scroll from right to left</marquee>
+
+<marquee direction="up">This text will scroll from bottom to top</marquee>
+
+<marquee
+  direction="down"
+  width="250"
+  height="200"
+  behavior="alternate"
+  style="border:solid"
+>
+  <marquee behavior="alternate"> This text will bounce </marquee>
+</marquee>
+
+<div>
+  <marquee>This text will scroll from right to left</marquee>
+</div>
+
+<div>
+  <h6>Minor Subtitle - H6</h6>
+</div>

tests/fixtures/rules/no-restricted-html-elements/valid/array-config.json

@@ -0,0 +1,3 @@
+{
+  "options": ["h1", "h2", "h3", "h4", "h5", "h6"]
+}

tests/fixtures/rules/no-restricted-html-elements/valid/array-input.svelte

@@ -0,0 +1,23 @@
+<div style="font-size: 2em; font-weight: bold;">This is a title</div>
+<div style="font-size: 1.5em; font-weight: bold;">This is a subtitle</div>
+<p>This is a paragraph. Some sample text goes here.</p>
+<ul>
+  <li>This is</li>
+  <li>a list item</li>
+</ul>
+<table>
+  <tr>
+    <td>Table Cell 1</td>
+    <td>Table Cell 2</td>
+  </tr>
+  <tr>
+    <td>Table Cell 3</td>
+    <td>Table Cell 4</td>
+  </tr>
+</table>
+<a href="https://example.com">This is a hyperlink to example.com</a>
+<form>
+  <label for="fname">First name:</label><br />
+  <input type="text" id="fname" name="fname" /><br />
+  <input type="submit" value="Submit" />
+</form>

tests/fixtures/rules/no-restricted-html-elements/valid/object-config.json

@@ -0,0 +1,12 @@
+{
+  "options": [
+    {
+      "elements": ["h1", "h2", "h3", "h4", "h5", "h6"],
+      "message": "Prefer use of our custom <Heading /> component"
+    },
+    {
+      "elements": ["marquee"],
+      "message": "Do not use deprecated HTML tags"
+    }
+  ]
+}