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node_modules/stylelint/lib/rules/declaration-colon-newline-after/README.md

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+# declaration-colon-newline-after
+
+Require a newline or disallow whitespace after the colon of declarations.
+
+```css
+a {
+  box-shadow:
+    0 0 0 1px #5b9dd9,
+    0 0 2px 1px rgba(30, 140, 190, 0.8);
+}        /* ↑ */
+/**         ↑
+ * The newline after this colon */
+```
+
+## Options
+
+`string`: `"always"|"always-multi-line"`
+
+### `"always"`
+
+There *must always* be a newline after the colon.
+
+The following patterns are considered warnings:
+
+```css
+a { color:pink; }
+```
+
+```css
+a { color: pink; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  color:
+    pink;
+}
+```
+
+### `"always-multi-line"`
+
+There *must always* be a newline after the colon *if the declaration's value is multi-line*.
+
+The following patterns are considered warnings:
+
+```css
+a {
+  box-shadow: 0 0 0 1px #5b9dd9,
+    0 0 2px 1px rgba(30, 140, 190, 0.8);
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  box-shadow:
+    0 0 0 1px #5b9dd9,
+    0 0 2px 1px rgba(30, 140, 190, 0.8);
+}
+```
+
+```css
+a {
+  color: pink;
+}
+```

node_modules/stylelint/lib/rules/declaration-colon-newline-after/index.js

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+"use strict"
+
+const declarationValueIndex = require("../../utils/declarationValueIndex")
+const isStandardSyntaxDeclaration = require("../../utils/isStandardSyntaxDeclaration")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const whitespaceChecker = require("../../utils/whitespaceChecker")
+
+const ruleName = "declaration-colon-newline-after"
+
+const messages = ruleMessages(ruleName, {
+  expectedAfter: () => "Expected newline after \":\"",
+  expectedAfterMultiLine: () => "Expected newline after \":\" with a multi-line declaration",
+})
+
+const rule = function (expectation) {
+  const checker = whitespaceChecker("newline", expectation, messages)
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "always",
+        "always-multi-line",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkDecls(decl => {
+      if (!isStandardSyntaxDeclaration(decl)) {
+        return
+      }
+
+      // Get the raw prop, and only the prop
+      const endOfPropIndex = declarationValueIndex(decl) + (decl.raws.between || "").length - 1
+
+      // The extra characters tacked onto the end ensure that there is a character to check
+      // after the colon. Otherwise, with `background:pink` the character after the
+      const propPlusColon = decl.toString().slice(0, endOfPropIndex) + "xxx"
+
+      for (let i = 0, l = propPlusColon.length; i < l; i++) {
+        if (propPlusColon[i] !== ":") {
+          continue
+        }
+        const indexToCheck = propPlusColon.substr(propPlusColon[i], 3) === "/*" ? propPlusColon.indexOf("*/", i) + 1 : i
+
+        checker.afterOneOnly({
+          source: propPlusColon,
+          index: indexToCheck,
+          lineCheckStr: decl.value,
+          err: m => {
+            report({
+              message: m,
+              node: decl,
+              index: indexToCheck,
+              result,
+              ruleName,
+            })
+          },
+        })
+      }
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule