diff --git a/Readme.md b/Readme.md
index 5944116..a1e21eb 100644
--- a/Readme.md
+++ b/Readme.md
@@ -3,7 +3,6 @@
 [![All Contributors](https://img.shields.io/badge/all_contributors-5-orange.svg?style=flat-square)](#contributors)
 [![codecov](https://codecov.io/gh/productboardlabs/stylelint-pb/branch/master/graph/badge.svg)](https://codecov.io/gh/productboardlabs/stylelint-pb)
 
-
 Set (TODO) of our custom made rules for Stylelint. 🚀
 
 ## Story
@@ -40,6 +39,18 @@ Example configuration. 👇
 }
 ```
 
+You can also run this rule in **strict mode** which means that there is no other color than variable allowed!
+
+```js
+{
+    rules: {
+        "@productboardlabs/smart-color-replacement": [{
+            "@snowWhite": "#f4f5e2"
+        }, "strictMode"]
+    }
+}
+```
+
 ## Contributors
 
 Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
diff --git a/src/index.js b/src/index.js
index 63a9e13..107cb61 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,4 +1,6 @@
 const { createPlugin } = require("stylelint");
-const rule = require("./rules");
+const rules = require("./rules");
 
-module.exports = createPlugin("@productboard/smart-color-replacement", rule);
+module.exports = Object.values(rules).map(rule =>
+  createPlugin(rule.ruleName, rule)
+);
diff --git a/src/rules/__tests__/index.test.js b/src/rules/__tests__/index.test.js
deleted file mode 100644
index 2f0e9a7..0000000
--- a/src/rules/__tests__/index.test.js
+++ /dev/null
@@ -1,53 +0,0 @@
-const rule = require("../index");
-
-testRule(rule, {
-  ruleName: rule.ruleName,
-  config: [
-    {
-      "@snowWhite": "#f4f5e2"
-    }
-  ],
-  fix: true,
-
-  accept: [
-    {
-      code: "a { color: @snowWhite; }",
-      description: "Variables are OK"
-    },
-    {
-      code: "a { font-size: 3rem; }",
-      description: "No variable is OK"
-    }
-  ],
-
-  reject: [
-    {
-      code: "a { color: #f4f5e2; }",
-      fixed: "a { color: @snowWhite; }",
-      description: "Variables should be used",
-      message:
-        'Colour "#f4f5e2" should be "@snowWhite". (@productboard/smart-color-replacement)',
-      line: 1
-    },
-    {
-      code: "a { background: rgb(244, 245, 226); }",
-      fixed: "a { background: @snowWhite; }",
-      description: "Variables should be used",
-      message:
-        'Colour "rgb(244, 245, 226)" should be "@snowWhite". (@productboard/smart-color-replacement)',
-      line: 1
-    }
-  ]
-});
-
-testRule(rule, {
-  ruleName: rule.ruleName,
-  fix: true,
-
-  accept: [
-    {
-      code: "a { font-size: 3rem; }",
-      description: "No variable is OK"
-    }
-  ]
-});
diff --git a/src/rules/__tests__/smart-color-replacement.test.js b/src/rules/__tests__/smart-color-replacement.test.js
new file mode 100644
index 0000000..45791be
--- /dev/null
+++ b/src/rules/__tests__/smart-color-replacement.test.js
@@ -0,0 +1,100 @@
+const rule = require("../smart-color-replacement");
+
+testRule(rule, {
+  ruleName: rule.ruleName,
+  config: [
+    {
+      "@snowWhite": "#f4f5e2"
+    }
+  ],
+  fix: true,
+
+  accept: [
+    {
+      code: "",
+      description: "empty stylesheet"
+    },
+    {
+      code: "a {}",
+      description: "empty rule"
+    },
+    {
+      code: '@import "foo.css";',
+      description: "blockless statement"
+    },
+    {
+      code: ":global {}",
+      description: "CSS Modules global empty rule set"
+    },
+    {
+      code: "a { color: @snowWhite; }",
+      description: "Usage of correct variable"
+    },
+    {
+      code: "a { font-size: 3rem; }",
+      description: "No color usage should be ignored"
+    },
+    {
+      code: "a { color: #333333; }",
+      description: "Color out of the config should be ignored by default"
+    }
+  ],
+
+  reject: [
+    {
+      code: "a { color: #f4f5e2; }",
+      fixed: "a { color: @snowWhite; }",
+      description: "Should use correct variable not hexadecimal notation",
+      message: rule.messages.expected([
+        {
+          used: "#f4f5e2",
+          suggested: "@snowWhite"
+        }
+      ]),
+      line: 1
+    },
+    {
+      code: "a { background: rgb(244, 245, 226); }",
+      fixed: "a { background: @snowWhite; }",
+      description: "Should use correct variable not rgb notation",
+      message: rule.messages.expected([
+        {
+          used: "rgb(244, 245, 226)",
+          suggested: "@snowWhite"
+        }
+      ]),
+      line: 1
+    }
+  ]
+});
+
+testRule(rule, {
+  ruleName: rule.ruleName,
+  fix: true,
+
+  accept: [
+    {
+      code: "a { font-size: 3rem; }",
+      description: "Should do nothing without config"
+    }
+  ]
+});
+
+testRule(rule, {
+  ruleName: rule.ruleName,
+  config: [
+    {
+      "@snowWhite": "#f4f5e2"
+    },
+    "strictMode"
+  ],
+  fix: true,
+
+  reject: [
+    {
+      code: "a { color: #333333; }",
+      fixed: "a { color: #333333; }",
+      description: "Any color except variables is prohibited!"
+    }
+  ]
+});
diff --git a/src/rules/index.js b/src/rules/index.js
index 9a531d3..e490185 100644
--- a/src/rules/index.js
+++ b/src/rules/index.js
@@ -1,78 +1,5 @@
-const stylelint = require("stylelint");
-const color = require("color");
+const smartColorReplacement = require("./smart-color-replacement");
 
-const ruleName = "@productboard/smart-color-replacement";
-
-const messages = stylelint.utils.ruleMessages(ruleName, {
-  expected: failedColors =>
-    failedColors
-      .map(
-        ({ used, suggested }) => `Colour "${used}" should be "${suggested}".`
-      )
-      .join(" ")
-});
-
-const rule = function(expectation, _, context) {
-  return (root, result) => {
-    const HEX_REGEX = /(#[a-f0-9]{3,6})/gi;
-    const RGB_REGEX = /(rgb|rgba)\([^\)]*\)/gi;
-    const HSL_REGEX = /hsl\((\d+),\s*([\d.]+)%,\s*([\d.]+)%\)/gi;
-
-    const patterns = [HEX_REGEX, RGB_REGEX, HSL_REGEX];
-
-    if (typeof expectation !== "object" || !expectation) return;
-
-    root.walkDecls(declaration => {
-      const { value } = declaration;
-      const colors = patterns.reduce((acc, c) => {
-        const matches = value.match(c);
-        if (matches && matches.length > 0) {
-          const colors = matches.map(m => ({
-            sanitized: color(m).hex(),
-            original: m
-          }));
-          acc.push(...colors);
-        }
-
-        return acc;
-      }, []);
-
-      const lookUpObject = Object.entries(expectation).reduce(
-        (acc, [key, value]) => {
-          acc[value.toUpperCase()] = key;
-
-          return acc;
-        },
-        {}
-      );
-
-      const results = colors.map(({ sanitized, original }) => ({
-        valid: !lookUpObject[sanitized],
-        used: original,
-        suggested: lookUpObject[sanitized]
-      }));
-
-      const failedColors = results.filter(res => !res.valid);
-
-      if (failedColors.length) {
-        stylelint.utils.report({
-          message: messages.expected(failedColors),
-          node: declaration,
-          result,
-          ruleName
-        });
-
-        if (context.fix) {
-          failedColors.forEach(({ used, suggested }) => {
-            declaration.value = declaration.value.replace(used, suggested);
-          });
-        }
-      }
-    });
-  };
+module.exports = {
+  smartColorReplacement
 };
-
-rule.ruleName = ruleName;
-rule.messages = messages;
-
-module.exports = rule;
diff --git a/src/rules/smart-color-replacement.js b/src/rules/smart-color-replacement.js
new file mode 100644
index 0000000..bc8b094
--- /dev/null
+++ b/src/rules/smart-color-replacement.js
@@ -0,0 +1,79 @@
+const stylelint = require("stylelint");
+const color = require("color");
+
+const HEX_REGEX = /(#[a-f0-9]{3,6})/gi;
+const RGB_REGEX = /(rgb|rgba)\([^\)]*\)/gi;
+const HSL_REGEX = /hsl\((\d+),\s*([\d.]+)%,\s*([\d.]+)%\)/gi;
+
+const ruleName = "@productboard/smart-color-replacement";
+
+const messages = stylelint.utils.ruleMessages(ruleName, {
+  expected: failedColors =>
+    failedColors
+      .map(({ used, suggested }) => `Color "${used}" should be "${suggested}".`)
+      .join(" ")
+});
+
+const rule = function(configuration, strictMode, context) {
+  return (root, result) => {
+    if (typeof configuration !== "object" || !configuration) return;
+
+    const lookUpObject = Object.entries(configuration).reduce(
+      (acc, [key, value]) => {
+        acc[value.toUpperCase()] = key;
+
+        return acc;
+      },
+      {}
+    );
+
+    const patterns = [HEX_REGEX, RGB_REGEX, HSL_REGEX];
+
+    root.walkDecls(declaration => {
+      const { value } = declaration;
+      const colors = patterns.reduce((acc, c) => {
+        const matches = value.match(c);
+        if (matches && matches.length > 0) {
+          acc.push(...matches);
+        }
+
+        return acc;
+      }, []);
+
+      const results = colors.map(used => {
+        const sanitized = color(used).hex();
+        return {
+          valid: lookUpObject[sanitized]
+            ? !lookUpObject[sanitized]
+            : strictMode !== "strictMode",
+          suggested: lookUpObject[sanitized],
+          used
+        };
+      });
+
+      const failedColors = results.filter(res => !res.valid);
+
+      if (failedColors.length) {
+        stylelint.utils.report({
+          message: messages.expected(failedColors),
+          node: declaration,
+          result,
+          ruleName
+        });
+
+        if (context.fix) {
+          failedColors
+            .filter(({ suggested }) => suggested)
+            .forEach(({ used, suggested }) => {
+              declaration.value = declaration.value.replace(used, suggested);
+            });
+        }
+      }
+    });
+  };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+
+module.exports = rule;