feat: Add support for media conditions in require-baseline rule

docs/rules/require-baseline.md

@@ -20,6 +20,7 @@ This rule warns when it finds any of the following:
 
 - A CSS property that isn't widely available or otherwise isn't enclosed in a `@supports` block.
 - An at-rule that isn't widely available.
+- A media condition inside `@media` that isn't widely available.
 - A CSS property value that isn't widely available or otherwise isn't enclosed in a `@supports` block (currently limited to identifiers only).
 - A CSS property function that isn't widely available.
 
@@ -38,6 +39,13 @@ a {
 	width: abs(20% - 100px);
 }
 
+/* invalid - device-posture is not widely available */
+@media (device-posture: folded) {
+	a {
+		color: red;
+	}
+}
+
 /* invalid - property value doesn't match @supports indicator */
 @supports (accent-color: auto) {
 	a {

src/data/baseline-data.js

@@ -518,6 +518,46 @@ export const atRules = new Map([
 	["starting-style", 0],
 	["supports", 10],
 ]);
+export const mediaConditions = new Map([
+	["color-gamut", 5],
+	["device-posture", 0],
+	["device-aspect-ratio", 0],
+	["device-height", 0],
+	["device-width", 0],
+	["display-mode", 0],
+	["dynamic-range", 10],
+	["forced-colors", 5],
+	["any-hover", 10],
+	["any-pointer", 10],
+	["hover", 10],
+	["pointer", 10],
+	["inverted-colors", 0],
+	["aspect-ratio", 10],
+	["calc", 10],
+	["color", 10],
+	["color-index", 10],
+	["grid", 10],
+	["height", 10],
+	["monochrome", 10],
+	["nested-queries", 10],
+	["orientation", 10],
+	["width", 10],
+	["overflow-block", 5],
+	["overflow-inline", 5],
+	["prefers-color-scheme", 10],
+	["prefers-contrast", 10],
+	["prefers-reduced-data", 0],
+	["prefers-reduced-motion", 10],
+	["prefers-reduced-transparency", 0],
+	["resolution", 5],
+	["-webkit-device-pixel-ratio", 10],
+	["-webkit-max-device-pixel-ratio", 10],
+	["-webkit-min-device-pixel-ratio", 10],
+	["scripting", 5],
+	["-webkit-transform-3d", 10],
+	["update", 5],
+	["video-dynamic-range", 0],
+]);
 export const types = new Map([
 	["abs", 0],
 	["sign", 0],

src/rules/require-baseline.js

@@ -13,6 +13,7 @@ import {
 	properties,
 	propertyValues,
 	atRules,
+	mediaConditions,
 	types,
 } from "../data/baseline-data.js";
 import { namedColors } from "../data/colors.js";
@@ -344,6 +345,8 @@ export default {
 				"At-rule '@{{atRule}}' is not a {{availability}} available baseline feature.",
 			notBaselineType:
 				"Type '{{type}}' is not a {{availability}} available baseline feature.",
+			notBaselineMediaCondition:
+				"Media condition '{{condition}}' is not a {{availability}} available baseline feature.",
 		},
 	},
 
@@ -549,6 +552,50 @@ export default {
 				supportsRules.pop();
 			},
 
+			"Atrule[name=media] > AtrulePrelude > MediaQueryList > MediaQuery > Condition"(
+				node,
+			) {
+				for (const child of node.children) {
+					// ignore unknown media conditions - no-invalid-at-rules already catches this
+					if (!mediaConditions.has(child.name)) {
+						continue;
+					}
+
+					if (child.type !== "Feature") {
+						continue;
+					}
+
+					const conditionLevel = mediaConditions.get(child.name);
+
+					if (conditionLevel < baselineLevel) {
+						const loc = child.loc;
+
+						context.report({
+							loc: {
+								start: {
+									line: loc.start.line,
+									// add 1 to account for the @ symbol
+									column: loc.start.column + 1,
+								},
+								end: {
+									line: loc.start.line,
+									column:
+										// add 1 to account for the @ symbol
+										loc.start.column +
+										child.name.length +
+										1,
+								},
+							},
+							messageId: "notBaselineMediaCondition",
+							data: {
+								condition: child.name,
+								availability,
+							},
+						});
+					}
+				}
+			},
+
 			Atrule(node) {
 				// ignore unknown at-rules - no-invalid-at-rules already catches this
 				if (!atRules.has(node.name)) {

tests/rules/require-baseline.test.js

@@ -34,6 +34,7 @@ ruleTester.run("require-baseline", rule, {
 		"a { color: red; -moz-transition: bar }",
 		"@font-face { font-weight: 100 400 }",
 		"@media (min-width: 800px) { a { color: red; } }",
+		"@media (prefers-color-scheme: dark) { a { color: red; } }",
 		"@supports (accent-color: auto) { a { accent-color: auto; } }",
 		"@supports (accent-color: red) { a { accent-color: red; } }",
 		"@supports (accent-color: auto) { a { accent-color: red; } }",
@@ -179,7 +180,7 @@ ruleTester.run("require-baseline", rule, {
 				@supports (backdrop-filter: auto) {
 					a { accent-color: red; }
 				}
-				
+
 				a { backdrop-filter: auto; }
 			}`,
 			errors: [
@@ -261,5 +262,65 @@ ruleTester.run("require-baseline", rule, {
 				},
 			],
 		},
+		{
+			code: "@media (color-gamut: srgb) { a { color: red; } }",
+			errors: [
+				{
+					messageId: "notBaselineMediaCondition",
+					data: {
+						condition: "color-gamut",
+						availability: "widely",
+					},
+					line: 1,
+					column: 9,
+					endLine: 1,
+					endColumn: 20,
+				},
+			],
+		},
+		{
+			code: "@media (device-posture: folded) { a { color: red; } }",
+			options: [{ available: "newly" }],
+			errors: [
+				{
+					messageId: "notBaselineMediaCondition",
+					data: {
+						condition: "device-posture",
+						availability: "newly",
+					},
+					line: 1,
+					column: 9,
+					endLine: 1,
+					endColumn: 23,
+				},
+			],
+		},
+		{
+			code: "@media (height: 600px) and (color-gamut: srgb) and (device-posture: folded) { a { color: red; } }",
+			errors: [
+				{
+					messageId: "notBaselineMediaCondition",
+					data: {
+						condition: "color-gamut",
+						availability: "widely",
+					},
+					line: 1,
+					column: 29,
+					endLine: 1,
+					endColumn: 40,
+				},
+				{
+					messageId: "notBaselineMediaCondition",
+					data: {
+						condition: "device-posture",
+						availability: "widely",
+					},
+					line: 1,
+					column: 53,
+					endLine: 1,
+					endColumn: 67,
+				},
+			],
+		},
 	],
 });

tools/generate-baseline.js

@@ -65,12 +65,15 @@ function extractCSSFeatures(features) {
 	const cssPropertyValuePattern =
 		/^css\.properties\.(?<property>[a-zA-Z$\d-]+)\.(?<value>[a-zA-Z$\d-]+)$/u;
 	const cssAtRulePattern = /^css\.at-rules\.(?<atRule>[a-zA-Z$\d-]+)$/u;
+	const cssMediaConditionPattern =
+		/^css\.at-rules\.media\.(?<condition>[a-zA-Z$\d-]+)$/u;
 	const cssTypePattern = /^css\.types\.(?<type>[a-zA-Z$\d-]+)$/u;
 	const cssSelectorPattern = /^css\.selectors\.(?<selector>[a-zA-Z$\d-]+)$/u;
 
 	const properties = {};
 	const propertyValues = {};
 	const atRules = {};
+	const mediaConditions = {};
 	const types = {};
 	const selectors = {};
 
@@ -99,6 +102,12 @@ function extractCSSFeatures(features) {
 			continue;
 		}
 
+		// Media conditions (@media features)
+		if ((match = cssMediaConditionPattern.exec(key)) !== null) {
+			mediaConditions[match.groups.condition] = baselineIds.get(baseline);
+			continue;
+		}
+
 		// types
 		if ((match = cssTypePattern.exec(key)) !== null) {
 			types[match.groups.type] = baselineIds.get(baseline);
@@ -116,6 +125,7 @@ function extractCSSFeatures(features) {
 		properties,
 		propertyValues,
 		atRules,
+		mediaConditions,
 		types,
 		selectors,
 	};
@@ -151,6 +161,7 @@ export const BASELINE_FALSE = ${BASELINE_FALSE};
 
 export const properties = new Map(${JSON.stringify(Object.entries(cssFeatures.properties), null, "\t")});
 export const atRules = new Map(${JSON.stringify(Object.entries(cssFeatures.atRules), null, "\t")});
+export const mediaConditions = new Map(${JSON.stringify(Object.entries(cssFeatures.mediaConditions), null, "\t")});
 export const types = new Map(${JSON.stringify(Object.entries(cssFeatures.types), null, "\t")});
 export const selectors = new Map(${JSON.stringify(Object.entries(cssFeatures.selectors), null, "\t")});
 export const propertyValues = new Map([${Object.entries(