diff --git a/lib/rules/boolean-prop-naming.js b/lib/rules/boolean-prop-naming.js
index fe55d52065..e856a17967 100644
--- a/lib/rules/boolean-prop-naming.js
+++ b/lib/rules/boolean-prop-naming.js
@@ -18,6 +18,18 @@ const eslintUtil = require('../util/eslint');
 const getSourceCode = eslintUtil.getSourceCode;
 const getText = eslintUtil.getText;
 
+/**
+ * Checks if prop is nested
+ * @param {Object} prop Property object, single prop type declaration
+ * @returns {boolean}
+ */
+function nestedPropTypes(prop) {
+  return (
+    prop.type === 'Property'
+        && prop.value.type === 'CallExpression'
+  );
+}
+
 // ------------------------------------------------------------------------------
 // Rule Definition
 // ------------------------------------------------------------------------------
@@ -162,18 +174,6 @@ module.exports = {
       );
     }
 
-    /**
-     * Checks if prop is nested
-     * @param {Object} prop Property object, single prop type declaration
-     * @returns {boolean}
-     */
-    function nestedPropTypes(prop) {
-      return (
-        prop.type === 'Property'
-        && prop.value.type === 'CallExpression'
-      );
-    }
-
     /**
      * Runs recursive check on all proptypes
      * @param {Array} proptypes A list of Property object (for each proptype defined)
diff --git a/lib/rules/jsx-curly-brace-presence.js b/lib/rules/jsx-curly-brace-presence.js
index 083a60a0e3..213e0ce3ca 100755
--- a/lib/rules/jsx-curly-brace-presence.js
+++ b/lib/rules/jsx-curly-brace-presence.js
@@ -31,6 +31,108 @@ const OPTION_VALUES = [
 ];
 const DEFAULT_CONFIG = { props: OPTION_NEVER, children: OPTION_NEVER, propElementValues: OPTION_IGNORE };
 
+const HTML_ENTITY_REGEX = () => /&[A-Za-z\d#]+;/g;
+
+function containsLineTerminators(rawStringValue) {
+  return /[\n\r\u2028\u2029]/.test(rawStringValue);
+}
+
+function containsBackslash(rawStringValue) {
+  return arrayIncludes(rawStringValue, '\\');
+}
+
+function containsHTMLEntity(rawStringValue) {
+  return HTML_ENTITY_REGEX().test(rawStringValue);
+}
+
+function containsOnlyHtmlEntities(rawStringValue) {
+  return rawStringValue.replace(HTML_ENTITY_REGEX(), '').trim() === '';
+}
+
+function containsDisallowedJSXTextChars(rawStringValue) {
+  return /[{<>}]/.test(rawStringValue);
+}
+
+function containsQuoteCharacters(value) {
+  return /['"]/.test(value);
+}
+
+function containsMultilineComment(value) {
+  return /\/\*/.test(value);
+}
+
+function escapeDoubleQuotes(rawStringValue) {
+  return rawStringValue.replace(/\\"/g, '"').replace(/"/g, '\\"');
+}
+
+function escapeBackslashes(rawStringValue) {
+  return rawStringValue.replace(/\\/g, '\\\\');
+}
+
+function needToEscapeCharacterForJSX(raw, node) {
+  return (
+    containsBackslash(raw)
+    || containsHTMLEntity(raw)
+    || (node.parent.type !== 'JSXAttribute' && containsDisallowedJSXTextChars(raw))
+  );
+}
+
+function containsWhitespaceExpression(child) {
+  if (child.type === 'JSXExpressionContainer') {
+    const value = child.expression.value;
+    return value ? jsxUtil.isWhiteSpaces(value) : false;
+  }
+  return false;
+}
+
+function isLineBreak(text) {
+  return containsLineTerminators(text) && text.trim() === '';
+}
+
+function wrapNonHTMLEntities(text) {
+  const HTML_ENTITY = '<HTML_ENTITY>';
+  const withCurlyBraces = text.split(HTML_ENTITY_REGEX()).map((word) => (
+    word === '' ? '' : `{${JSON.stringify(word)}}`
+  )).join(HTML_ENTITY);
+
+  const htmlEntities = text.match(HTML_ENTITY_REGEX());
+  return htmlEntities.reduce((acc, htmlEntity) => (
+    acc.replace(HTML_ENTITY, htmlEntity)
+  ), withCurlyBraces);
+}
+
+function wrapWithCurlyBraces(rawText) {
+  if (!containsLineTerminators(rawText)) {
+    return `{${JSON.stringify(rawText)}}`;
+  }
+
+  return rawText.split('\n').map((line) => {
+    if (line.trim() === '') {
+      return line;
+    }
+    const firstCharIndex = line.search(/[^\s]/);
+    const leftWhitespace = line.slice(0, firstCharIndex);
+    const text = line.slice(firstCharIndex);
+
+    if (containsHTMLEntity(line)) {
+      return `${leftWhitespace}${wrapNonHTMLEntities(text)}`;
+    }
+    return `${leftWhitespace}{${JSON.stringify(text)}}`;
+  }).join('\n');
+}
+
+function isWhiteSpaceLiteral(node) {
+  return node.type && node.type === 'Literal' && node.value && jsxUtil.isWhiteSpaces(node.value);
+}
+
+function isStringWithTrailingWhiteSpaces(value) {
+  return /^\s|\s$/.test(value);
+}
+
+function isLiteralWithTrailingWhiteSpaces(node) {
+  return node.type && node.type === 'Literal' && node.value && isStringWithTrailingWhiteSpaces(node.value);
+}
+
 // ------------------------------------------------------------------------------
 // Rule Definition
 // ------------------------------------------------------------------------------
@@ -74,100 +176,11 @@ module.exports = {
   },
 
   create(context) {
-    const HTML_ENTITY_REGEX = () => /&[A-Za-z\d#]+;/g;
     const ruleOptions = context.options[0];
     const userConfig = typeof ruleOptions === 'string'
       ? { props: ruleOptions, children: ruleOptions, propElementValues: OPTION_IGNORE }
       : Object.assign({}, DEFAULT_CONFIG, ruleOptions);
 
-    function containsLineTerminators(rawStringValue) {
-      return /[\n\r\u2028\u2029]/.test(rawStringValue);
-    }
-
-    function containsBackslash(rawStringValue) {
-      return arrayIncludes(rawStringValue, '\\');
-    }
-
-    function containsHTMLEntity(rawStringValue) {
-      return HTML_ENTITY_REGEX().test(rawStringValue);
-    }
-
-    function containsOnlyHtmlEntities(rawStringValue) {
-      return rawStringValue.replace(HTML_ENTITY_REGEX(), '').trim() === '';
-    }
-
-    function containsDisallowedJSXTextChars(rawStringValue) {
-      return /[{<>}]/.test(rawStringValue);
-    }
-
-    function containsQuoteCharacters(value) {
-      return /['"]/.test(value);
-    }
-
-    function containsMultilineComment(value) {
-      return /\/\*/.test(value);
-    }
-
-    function escapeDoubleQuotes(rawStringValue) {
-      return rawStringValue.replace(/\\"/g, '"').replace(/"/g, '\\"');
-    }
-
-    function escapeBackslashes(rawStringValue) {
-      return rawStringValue.replace(/\\/g, '\\\\');
-    }
-
-    function needToEscapeCharacterForJSX(raw, node) {
-      return (
-        containsBackslash(raw)
-        || containsHTMLEntity(raw)
-        || (node.parent.type !== 'JSXAttribute' && containsDisallowedJSXTextChars(raw))
-      );
-    }
-
-    function containsWhitespaceExpression(child) {
-      if (child.type === 'JSXExpressionContainer') {
-        const value = child.expression.value;
-        return value ? jsxUtil.isWhiteSpaces(value) : false;
-      }
-      return false;
-    }
-
-    function isLineBreak(text) {
-      return containsLineTerminators(text) && text.trim() === '';
-    }
-
-    function wrapNonHTMLEntities(text) {
-      const HTML_ENTITY = '<HTML_ENTITY>';
-      const withCurlyBraces = text.split(HTML_ENTITY_REGEX()).map((word) => (
-        word === '' ? '' : `{${JSON.stringify(word)}}`
-      )).join(HTML_ENTITY);
-
-      const htmlEntities = text.match(HTML_ENTITY_REGEX());
-      return htmlEntities.reduce((acc, htmlEntity) => (
-        acc.replace(HTML_ENTITY, htmlEntity)
-      ), withCurlyBraces);
-    }
-
-    function wrapWithCurlyBraces(rawText) {
-      if (!containsLineTerminators(rawText)) {
-        return `{${JSON.stringify(rawText)}}`;
-      }
-
-      return rawText.split('\n').map((line) => {
-        if (line.trim() === '') {
-          return line;
-        }
-        const firstCharIndex = line.search(/[^\s]/);
-        const leftWhitespace = line.slice(0, firstCharIndex);
-        const text = line.slice(firstCharIndex);
-
-        if (containsHTMLEntity(line)) {
-          return `${leftWhitespace}${wrapNonHTMLEntities(text)}`;
-        }
-        return `${leftWhitespace}{${JSON.stringify(text)}}`;
-      }).join('\n');
-    }
-
     /**
      * Report and fix an unnecessary curly brace violation on a node
      * @param {ASTNode} JSXExpressionNode - The AST node with an unnecessary JSX expression
@@ -233,18 +246,6 @@ module.exports = {
       });
     }
 
-    function isWhiteSpaceLiteral(node) {
-      return node.type && node.type === 'Literal' && node.value && jsxUtil.isWhiteSpaces(node.value);
-    }
-
-    function isStringWithTrailingWhiteSpaces(value) {
-      return /^\s|\s$/.test(value);
-    }
-
-    function isLiteralWithTrailingWhiteSpaces(node) {
-      return node.type && node.type === 'Literal' && node.value && isStringWithTrailingWhiteSpaces(node.value);
-    }
-
     // Bail out if there is any character that needs to be escaped in JSX
     // because escaping decreases readability and the original code may be more
     // readable anyway or intentional for other specific reasons
diff --git a/lib/rules/no-unused-prop-types.js b/lib/rules/no-unused-prop-types.js
index 55a21881ff..09dcfb5b58 100644
--- a/lib/rules/no-unused-prop-types.js
+++ b/lib/rules/no-unused-prop-types.js
@@ -14,6 +14,15 @@ const Components = require('../util/Components');
 const docsUrl = require('../util/docsUrl');
 const report = require('../util/report');
 
+/**
+ * Checks if the component must be validated
+ * @param {Object} component The component to process
+ * @returns {boolean} True if the component must be validated, false if not.
+ */
+function mustBeValidated(component) {
+  return !!component && !component.ignoreUnusedPropTypesValidation;
+}
+
 // ------------------------------------------------------------------------------
 // Rule Definition
 // ------------------------------------------------------------------------------
@@ -71,15 +80,6 @@ module.exports = {
       return configuration.ignore.indexOf(name) !== -1;
     }
 
-    /**
-     * Checks if the component must be validated
-     * @param {Object} component The component to process
-     * @returns {boolean} True if the component must be validated, false if not.
-     */
-    function mustBeValidated(component) {
-      return !!component && !component.ignoreUnusedPropTypesValidation;
-    }
-
     /**
      * Checks if a prop is used
      * @param {ASTNode} node The AST node being checked.
diff --git a/lib/rules/self-closing-comp.js b/lib/rules/self-closing-comp.js
index fe5fda4d49..23e168605f 100644
--- a/lib/rules/self-closing-comp.js
+++ b/lib/rules/self-closing-comp.js
@@ -9,12 +9,35 @@ const docsUrl = require('../util/docsUrl');
 const jsxUtil = require('../util/jsx');
 const report = require('../util/report');
 
+const optionDefaults = { component: true, html: true };
+
+function isComponent(node) {
+  return (
+    node.name
+    && (node.name.type === 'JSXIdentifier' || node.name.type === 'JSXMemberExpression')
+    && !jsxUtil.isDOMComponent(node)
+  );
+}
+
+function childrenIsEmpty(node) {
+  return node.parent.children.length === 0;
+}
+
+function childrenIsMultilineSpaces(node) {
+  const childrens = node.parent.children;
+
+  return (
+    childrens.length === 1
+    && (childrens[0].type === 'Literal' || childrens[0].type === 'JSXText')
+    && childrens[0].value.indexOf('\n') !== -1
+    && childrens[0].value.replace(/(?!\xA0)\s/g, '') === ''
+  );
+}
+
 // ------------------------------------------------------------------------------
 // Rule Definition
 // ------------------------------------------------------------------------------
 
-const optionDefaults = { component: true, html: true };
-
 const messages = {
   notSelfClosing: 'Empty components are self-closing',
 };
@@ -49,29 +72,6 @@ module.exports = {
   },
 
   create(context) {
-    function isComponent(node) {
-      return (
-        node.name
-        && (node.name.type === 'JSXIdentifier' || node.name.type === 'JSXMemberExpression')
-        && !jsxUtil.isDOMComponent(node)
-      );
-    }
-
-    function childrenIsEmpty(node) {
-      return node.parent.children.length === 0;
-    }
-
-    function childrenIsMultilineSpaces(node) {
-      const childrens = node.parent.children;
-
-      return (
-        childrens.length === 1
-        && (childrens[0].type === 'Literal' || childrens[0].type === 'JSXText')
-        && childrens[0].value.indexOf('\n') !== -1
-        && childrens[0].value.replace(/(?!\xA0)\s/g, '') === ''
-      );
-    }
-
     function isShouldBeSelfClosed(node) {
       const configuration = Object.assign({}, optionDefaults, context.options[0]);
       return (