Add deprecated rule warnings

.changeset/gold-llamas-pump.md

@@ -0,0 +1,5 @@
+---
+"stylelint": minor
+---
+
+Added: deprecated rule warnings

lib/__tests__/integration.test.js

@@ -60,7 +60,7 @@ describe('integration test expecting warnings', () => {
 	});
 
 	it('number and type', () => {
-		expect(result.messages).toHaveLength(5);
+		expect(result.messages).toHaveLength(6);
 		expect(result.messages.every((m) => m.type === 'warning')).toBeTruthy();
 		expect(result.messages.every((m) => m.plugin === 'stylelint')).toBeTruthy();
 	});

lib/formatters/__tests__/githubFormatter.test.js

@@ -47,13 +47,13 @@ test('githubFormatter', () => {
 	const returnValue = {
 		ruleMetadata: {
 			foo: { url: 'https://stylelint.io/rules/foo' },
-			bar: { fixable: true },
+			bar: { url: 'https://stylelint.io/rules/bar', fixable: true, deprecated: true },
 		},
 	};
 
 	expect(githubFormatter(results, returnValue))
 		.toBe(`::error file=path/to/file.css,line=1,col=2,endLine=1,endColumn=5,title=Stylelint problem::Unexpected "foo" (foo) - https://stylelint.io/rules/foo
-::warning file=a.css,line=10,col=20,title=Stylelint problem::Unexpected "bar" (bar) [maybe fixable]
+::warning file=a.css,line=10,col=20,title=Stylelint problem::Unexpected "bar" (bar) [maybe fixable, deprecated] - https://stylelint.io/rules/bar
 ::error file=a.css,line=20,col=1,title=Stylelint problem::Cannot parse foo (foo-error)
 ::error file=a.css,line=20,col=3,title=Stylelint problem::Anonymous error`);
 });

lib/formatters/__tests__/verboseFormatter.test.js

@@ -337,14 +337,30 @@ describe('verboseFormatter', () => {
 						severity: 'error',
 						text: 'Unexpected foo',
 					},
+					{
+						line: 1,
+						column: 2,
+						rule: 'no-bar',
+						severity: 'error',
+						text: 'Unexpected bar',
+					},
+					{
+						line: 1,
+						column: 2,
+						rule: 'no-baz',
+						severity: 'error',
+						text: 'Unexpected baz',
+					},
 				],
 				deprecations: [],
 				invalidOptionWarnings: [],
 			},
 		];
 		const returnValue = {
 			ruleMetadata: {
-				'no-foo': { url: 'https://stylelint.io', fixable: true },
+				'no-foo': { url: 'https://stylelint.io', fixable: true, deprecated: true },
+				'no-bar': { url: 'https://stylelint.io', fixable: true },
+				'no-baz': { url: 'https://stylelint.io', deprecated: true },
 			},
 		};
 
@@ -353,14 +369,18 @@ describe('verboseFormatter', () => {
 		expect(output).toBe(stripIndent`
 			file.css
 			 1:2  ×  Unexpected foo  no-foo
+			 1:2  ×  Unexpected bar  no-bar
+			 1:2  ×  Unexpected baz  no-baz
 
-			1 problem (1 error, 0 warnings)
+			3 problems (3 errors, 0 warnings)
 
 			1 source checked
 			 file.css
 
-			1 error found
-			 no-foo: 1 (maybe fixable)
+			3 errors found
+			 no-foo: 1 (maybe fixable, deprecated)
+			 no-bar: 1 (maybe fixable)
+			 no-baz: 1 (deprecated)
 
 			You may fix some problems with the "--fix" option.`);
 	});

lib/formatters/githubFormatter.js

@@ -35,7 +35,15 @@ function buildMessage(msg, metadata) {
 	if (!metadata) return msg;
 
 	const url = metadata.url ? ` - ${metadata.url}` : '';
-	const fixable = metadata.fixable ? ' [maybe fixable]' : '';
 
-	return `${msg}${fixable}${url}`;
+	let additional = [
+		metadata.fixable ? 'maybe fixable' : '',
+		metadata.deprecated ? 'deprecated' : '',
+	]
+		.filter(Boolean)
+		.join(', ');
+
+	additional = additional ? ` [${additional}]` : '';
+
+	return `${msg}${additional}${url}`;
 }

lib/formatters/verboseFormatter.js

@@ -72,12 +72,17 @@ module.exports = function verboseFormatter(results, returnValue) {
 			const metadata = returnValue.ruleMetadata;
 
 			for (const [rule, list] of Object.entries(problemsByRule)) {
-				const meta = metadata[rule];
-				const fixable = meta && meta.fixable ? ' (maybe fixable)' : '';
+				const meta = metadata[rule] || {};
 
-				output += dim(` ${ruleLink(rule, meta)}: ${list.length}${fixable}\n`);
+				let additional = [meta.fixable ? 'maybe fixable' : '', meta.deprecated ? 'deprecated' : '']
+					.filter(Boolean)
+					.join(', ');
 
-				if (!fixableProblemsFound && meta && meta.fixable) {
+				additional = additional ? ` (${additional})` : '';
+
+				output += dim(` ${ruleLink(rule, meta)}: ${list.length}${additional}\n`);
+
+				if (!fixableProblemsFound && meta.fixable) {
 					fixableProblemsFound = true;
 				}
 			}

lib/lintPostcssResult.js

@@ -16,7 +16,7 @@ const getStylelintRule = require('./utils/getStylelintRule');
  * @param {StylelintConfig} config
  * @returns {Promise<any>}
  */
-function lintPostcssResult(stylelintOptions, postcssResult, config) {
+module.exports = function lintPostcssResult(stylelintOptions, postcssResult, config) {
 	postcssResult.stylelint.ruleSeverities = {};
 	postcssResult.stylelint.customMessages = {};
 	postcssResult.stylelint.ruleMetadata = {};
@@ -77,6 +77,10 @@ function lintPostcssResult(stylelintOptions, postcssResult, config) {
 			continue;
 		}
 
+		if (ruleFunction.meta && ruleFunction.meta.deprecated) {
+			warnDeprecatedRule(postcssResult, ruleName);
+		}
+
 		const ruleSettings = config.rules && config.rules[ruleName];
 
 		if (ruleSettings === null || ruleSettings[0] === null) {
@@ -114,7 +118,7 @@ function lintPostcssResult(stylelintOptions, postcssResult, config) {
 	}
 
 	return Promise.all(performRules);
-}
+};
 
 /**
  * There are currently some bugs in the autofixer of Stylelint.
@@ -131,4 +135,14 @@ function isFixCompatible({ stylelint }) {
 	return true;
 }
 
-module.exports = lintPostcssResult;
+/**
+ * @param {PostcssResult} result
+ * @param {string} ruleName
+ * @returns {void}
+ */
+function warnDeprecatedRule(result, ruleName) {
+	result.warn(
+		`The "${ruleName}" rule is deprecated and will be removed in the next major release.`,
+		{ stylelintType: 'deprecation' },
+	);
+}

scripts/visual-config.json

@@ -10,6 +10,8 @@
 				"severity": "warning"
 			}
 		],
-		"import-notation": "string"
+		"import-notation": "string",
+		"unit-case": null,
+		"string-quotes": "single"
 	}
 }