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node_modules/stylelint/lib/rules/declaration-bang-space-before/README.md

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+# declaration-bang-space-before
+
+Require a single space or disallow whitespace before the bang of declarations.
+
+```css
+a { color: pink !important; }
+/**             ↑
+ * The space before this exclamation mark */
+```
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+There *must always* be a single space before the bang.
+
+The following patterns are considered warnings:
+
+```css
+a { color: pink!important; }
+```
+
+```css
+a { color: pink  ! important; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { color: pink !important; }
+```
+
+```css
+a { color:pink ! important; }
+```
+
+### `"never"`
+
+There *must never* be whitespace before the bang.
+
+The following patterns are considered warnings:
+
+```css
+a { color : pink !important; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { color: pink!important; }
+```
+
+```css
+a { color: pink! important; }
+```

node_modules/stylelint/lib/rules/declaration-bang-space-before/index.js

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+"use strict"
+
+const declarationBangSpaceChecker = require("../declarationBangSpaceChecker")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const whitespaceChecker = require("../../utils/whitespaceChecker")
+
+const ruleName = "declaration-bang-space-before"
+
+const messages = ruleMessages(ruleName, {
+  expectedBefore: () => "Expected single space before \"!\"",
+  rejectedBefore: () => "Unexpected whitespace before \"!\"",
+})
+
+const rule = function (expectation) {
+  const checker = whitespaceChecker("space", expectation, messages)
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "always",
+        "never",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    declarationBangSpaceChecker({
+      root,
+      result,
+      locationChecker: checker.before,
+      checkedRuleName: ruleName,
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule