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node_modules/stylelint/lib/rules/keyframe-declaration-no-important/README.md

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+# keyframe-declaration-no-important
+
+Disallow `!important` within keyframe declarations.
+
+<!-- prettier-ignore -->
+```css
+@keyframes foo {
+  from { opacity: 0 }
+  to { opacity: 1 !important }
+}              /* ↑ */
+/**               ↑
+*   This !important */
+```
+
+Using `!important` within keyframes declarations is [completely ignored in some browsers](https://developer.mozilla.org/en-US/docs/Web/CSS/@keyframes#!important_in_a_keyframe).
+
+## Options
+
+### `true`
+
+The following patterns is considered a violation:
+
+<!-- prettier-ignore -->
+```css
+@keyframes foo {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1 !important;
+  }
+}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+@keyframes foo {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a { color: pink !important; }
+```

node_modules/stylelint/lib/rules/keyframe-declaration-no-important/index.js

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+// @ts-nocheck
+
+'use strict';
+
+const report = require('../../utils/report');
+const ruleMessages = require('../../utils/ruleMessages');
+const validateOptions = require('../../utils/validateOptions');
+
+const ruleName = 'keyframe-declaration-no-important';
+
+const messages = ruleMessages(ruleName, {
+	rejected: 'Unexpected !important',
+});
+
+function rule(actual) {
+	return (root, result) => {
+		const validOptions = validateOptions(result, ruleName, { actual });
+
+		if (!validOptions) {
+			return;
+		}
+
+		root.walkAtRules(/^(-(moz|webkit)-)?keyframes$/i, (atRuleKeyframes) => {
+			atRuleKeyframes.walkDecls((decl) => {
+				if (!decl.important) {
+					return;
+				}
+
+				report({
+					message: messages.rejected,
+					node: decl,
+					word: 'important',
+					result,
+					ruleName,
+				});
+			});
+		});
+	};
+}
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;