text-encoding-identifier-case: Ignore JSX meta[charset="utf-8"]

rules/text-encoding-identifier-case.js

@@ -39,6 +39,20 @@ const create = () => ({
 			return;
 		}
 
+		if (
+			node.value === 'utf-8'
+			&& node.parent.type === 'JSXAttribute'
+			&& node.parent.value === node
+			&& node.parent.name.type === 'JSXIdentifier'
+			&& node.parent.name.name.toLowerCase() === 'charset'
+			&& node.parent.parent.type === 'JSXOpeningElement'
+			&& node.parent.parent.attributes.includes(node.parent)
+			&& node.parent.parent.name.type === 'JSXIdentifier'
+			&& node.parent.parent.name.name.toLowerCase() === 'meta'
+		) {
+			return;
+		}
+
 		const {raw} = node;
 		const value = raw.slice(1, -1);
 

test/snapshots/text-encoding-identifier-case.mjs.md

@@ -279,3 +279,59 @@ Generated by [AVA](https://avajs.dev).
     > 1 | whatever.readFile(file, "UTF-8",)␊
         |                         ^^^^^^^ Prefer \`utf8\` over \`UTF-8\`.␊
     `
+
+## Invalid #1
+      1 | <not-meta charset="utf-8" />
+
+> Error 1/1
+
+    `␊
+    > 1 | <not-meta charset="utf-8" />␊
+        |                   ^^^^^^^ Prefer \`utf8\` over \`utf-8\`.␊
+    ␊
+    --------------------------------------------------------------------------------␊
+    Suggestion 1/1: Replace \`utf-8\` with \`utf8\`.␊
+      1 | <not-meta charset="utf8" />␊
+    `
+
+## Invalid #2
+      1 | <meta not-charset="utf-8" />
+
+> Error 1/1
+
+    `␊
+    > 1 | <meta not-charset="utf-8" />␊
+        |                   ^^^^^^^ Prefer \`utf8\` over \`utf-8\`.␊
+    ␊
+    --------------------------------------------------------------------------------␊
+    Suggestion 1/1: Replace \`utf-8\` with \`utf8\`.␊
+      1 | <meta not-charset="utf8" />␊
+    `
+
+## Invalid #3
+      1 | <meta charset="ASCII" />
+
+> Error 1/1
+
+    `␊
+    > 1 | <meta charset="ASCII" />␊
+        |               ^^^^^^^ Prefer \`ascii\` over \`ASCII\`.␊
+    ␊
+    --------------------------------------------------------------------------------␊
+    Suggestion 1/1: Replace \`ASCII\` with \`ascii\`.␊
+      1 | <meta charset="ascii" />␊
+    `
+
+## Invalid #4
+      1 | <META CHARSET="ASCII" />
+
+> Error 1/1
+
+    `␊
+    > 1 | <META CHARSET="ASCII" />␊
+        |               ^^^^^^^ Prefer \`ascii\` over \`ASCII\`.␊
+    ␊
+    --------------------------------------------------------------------------------␊
+    Suggestion 1/1: Replace \`ASCII\` with \`ascii\`.␊
+      1 | <META CHARSET="ascii" />␊
+    `

test/text-encoding-identifier-case.mjs

@@ -35,3 +35,24 @@ test.snapshot({
 		'whatever.readFile(file, "UTF-8",)',
 	],
 });
+
+// JSX
+test.snapshot({
+	testerOptions: {
+		parserOptions: {
+			ecmaFeatures: {
+				jsx: true,
+			},
+		},
+	},
+	valid: [
+		'<meta charset="utf-8" />',
+		'<META CHARSET="utf-8" />',
+	],
+	invalid: [
+		'<not-meta charset="utf-8" />',
+		'<meta not-charset="utf-8" />',
+		'<meta charset="ASCII" />',
+		'<META CHARSET="ASCII" />',
+	],
+});