diff --git a/src/utils/__tests__/hasInterpolation.test.js b/src/utils/__tests__/hasInterpolation.test.js
new file mode 100644
index 00000000..637d0011
--- /dev/null
+++ b/src/utils/__tests__/hasInterpolation.test.js
@@ -0,0 +1,17 @@
+import hasInterpolation from "../hasInterpolation";
+
+it("hasInterpolation", () => {
+  expect(hasInterpolation("(min-width#{$value}: 10px)")).toBeTruthy();
+  expect(hasInterpolation("(@{value}min-width : 10px)")).toBeTruthy();
+  expect(hasInterpolation("#{$Attr}-color")).toBeTruthy();
+  expect(hasInterpolation("@{Attr}-color")).toBeTruthy();
+  expect(hasInterpolation("#{50% - $n}")).toBeTruthy();
+  expect(hasInterpolation(".n-#{$n}")).toBeTruthy();
+  expect(hasInterpolation(":n-#{$n}")).toBeTruthy();
+  expect(hasInterpolation(".n-@{n}")).toBeTruthy();
+  expect(hasInterpolation("(min-width: 10px)")).toBeFalsy();
+  expect(hasInterpolation(".a{}")).toBeFalsy();
+  expect(hasInterpolation("$sass-variable + 'foo'")).toBeFalsy();
+  expect(hasInterpolation("10px")).toBeFalsy();
+  expect(hasInterpolation("@less-variable + 'foo'")).toBeFalsy();
+});
diff --git a/src/utils/__tests__/isStandardSyntaxProperty.test.js b/src/utils/__tests__/isStandardSyntaxProperty.test.js
new file mode 100644
index 00000000..198ef79e
--- /dev/null
+++ b/src/utils/__tests__/isStandardSyntaxProperty.test.js
@@ -0,0 +1,31 @@
+import isStandardSyntaxProperty from "../isStandardSyntaxProperty";
+
+describe("isStandardSyntaxProperty", () => {
+  it("single word", () => {
+    expect(isStandardSyntaxProperty("top")).toBeTruthy();
+  });
+  it("custom property", () => {
+    expect(isStandardSyntaxProperty("--custom-property")).toBeTruthy();
+  });
+  it("hyphenated words", () => {
+    expect(isStandardSyntaxProperty("border-top-left-radius")).toBeTruthy();
+  });
+  it("vendor prefix", () => {
+    expect(isStandardSyntaxProperty("-webkit-appearance")).toBeTruthy();
+  });
+  it("sass variable", () => {
+    expect(isStandardSyntaxProperty("$sass-variable")).toBeFalsy();
+  });
+  it("sass interpolation", () => {
+    expect(isStandardSyntaxProperty("#{$Attr}-color")).toBeFalsy();
+  });
+  it("less variable", () => {
+    expect(isStandardSyntaxProperty("@{Attr}-color")).toBeFalsy();
+  });
+  it("less append property value with comma", () => {
+    expect(isStandardSyntaxProperty("transform+")).toBeFalsy();
+  });
+  it("less append property value with space", () => {
+    expect(isStandardSyntaxProperty("transform+_")).toBeFalsy();
+  });
+});
diff --git a/src/utils/__tests__/isStandardSyntaxSelector.test.js b/src/utils/__tests__/isStandardSyntaxSelector.test.js
new file mode 100644
index 00000000..674d1e36
--- /dev/null
+++ b/src/utils/__tests__/isStandardSyntaxSelector.test.js
@@ -0,0 +1,78 @@
+import isStandardSyntaxSelector from "../isStandardSyntaxSelector";
+
+describe("isStandardSyntaxSelector", () => {
+  it("type", () => {
+    expect(isStandardSyntaxSelector("a")).toBeTruthy();
+  });
+  it("class", () => {
+    expect(isStandardSyntaxSelector(".a")).toBeTruthy();
+  });
+  it("attribute", () => {
+    expect(isStandardSyntaxSelector("[a=a]")).toBeTruthy();
+  });
+  it("universal", () => {
+    expect(isStandardSyntaxSelector("*")).toBeTruthy();
+  });
+  it("pseudo-class", () => {
+    expect(isStandardSyntaxSelector("a:last-child")).toBeTruthy();
+  });
+  it("pseudo-class with function", () => {
+    expect(isStandardSyntaxSelector("a:not(.b)")).toBeTruthy();
+  });
+  it("pseudo-element", () => {
+    expect(isStandardSyntaxSelector("a::after")).toBeTruthy();
+  });
+  it("compound", () => {
+    expect(isStandardSyntaxSelector("a.b")).toBeTruthy();
+  });
+  it("complex", () => {
+    expect(isStandardSyntaxSelector("a > b")).toBeTruthy();
+  });
+  it("list", () => {
+    expect(isStandardSyntaxSelector("a, b")).toBeTruthy();
+  });
+  it("SCSS interpolation (id)", () => {
+    expect(isStandardSyntaxSelector("#{50% - $n}")).toBeFalsy();
+  });
+  it("SCSS interpolation (class)", () => {
+    expect(isStandardSyntaxSelector(".n-#{$n}")).toBeFalsy();
+  });
+  it("SCSS interpolation (pseudo)", () => {
+    expect(isStandardSyntaxSelector(":n-#{$n}")).toBeFalsy();
+  });
+  it("Less interpolation", () => {
+    expect(isStandardSyntaxSelector(".n-@{n}")).toBeFalsy();
+  });
+  it("Less extend", () => {
+    expect(isStandardSyntaxSelector(".a:extend(.a)")).toBeFalsy();
+  });
+  it("Less extend `all`", () => {
+    expect(isStandardSyntaxSelector(".a:extend(.a all)")).toBeFalsy();
+  });
+  it("Less extend inside ruleset", () => {
+    expect(isStandardSyntaxSelector("a { &:extend(.a all) }")).toBeFalsy();
+  });
+  it("SCSS placeholder", () => {
+    expect(isStandardSyntaxSelector("%foo")).toBeFalsy();
+  });
+  it("Less mixin with resolved nested selectors", () => {
+    expect(isStandardSyntaxSelector(".foo().bar")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo(@a, @b).bar")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo()#bar")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo()#bar")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo() bar")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo() + bar")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo() > bar")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo() ~ bar")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo()[bar]")).toBeFalsy();
+    expect(isStandardSyntaxSelector(".foo()[bar='baz']")).toBeFalsy();
+  });
+
+  it("ERB templates", () => {
+    // E. g. like in https://github.com/stylelint/stylelint/issues/4489
+    expect(isStandardSyntaxSelector("<% COLORS.each do |color| %>\na")).toBe(
+      false
+    );
+    expect(isStandardSyntaxSelector("<% eng %>\na")).toBe(false);
+  });
+});
diff --git a/src/utils/hasInterpolation.js b/src/utils/hasInterpolation.js
new file mode 100644
index 00000000..3dbea092
--- /dev/null
+++ b/src/utils/hasInterpolation.js
@@ -0,0 +1,24 @@
+import hasLessInterpolation from "./hasLessInterpolation";
+import hasPsvInterpolation from "./hasPsvInterpolation";
+import hasScssInterpolation from "./hasScssInterpolation";
+import hasTplInterpolation from "./hasTplInterpolation";
+
+/**
+ * Check whether a string has interpolation
+ *
+ * @param {string} string
+ * @return {boolean} If `true`, a string has interpolation
+ */
+export default function(string) {
+  // SCSS or Less interpolation
+  if (
+    hasLessInterpolation(string) ||
+    hasScssInterpolation(string) ||
+    hasTplInterpolation(string) ||
+    hasPsvInterpolation(string)
+  ) {
+    return true;
+  }
+
+  return false;
+}
diff --git a/src/utils/hasLessInterpolation.js b/src/utils/hasLessInterpolation.js
new file mode 100644
index 00000000..832fcfb6
--- /dev/null
+++ b/src/utils/hasLessInterpolation.js
@@ -0,0 +1,9 @@
+/**
+ * Check whether a string has less interpolation
+ *
+ * @param {string} string
+ * @return {boolean} If `true`, a string has less interpolation
+ */
+export default function(string) {
+  return /@{.+?}/.test(string);
+}
diff --git a/src/utils/hasPsvInterpolation.js b/src/utils/hasPsvInterpolation.js
new file mode 100644
index 00000000..edf4d32c
--- /dev/null
+++ b/src/utils/hasPsvInterpolation.js
@@ -0,0 +1,8 @@
+/**
+ * Check whether a string has postcss-simple-vars interpolation
+ *
+ * @param {string} string
+ */
+export default function(string) {
+  return /\$\(.+?\)/.test(string);
+}
diff --git a/src/utils/hasScssInterpolation.js b/src/utils/hasScssInterpolation.js
new file mode 100644
index 00000000..3eba8cb1
--- /dev/null
+++ b/src/utils/hasScssInterpolation.js
@@ -0,0 +1,8 @@
+/**
+ * Check whether a string has scss interpolation
+ *
+ * @param {string} string
+ */
+export default function(string) {
+  return /#{.+?}/.test(string);
+}
diff --git a/src/utils/hasTplInterpolation.js b/src/utils/hasTplInterpolation.js
new file mode 100644
index 00000000..f08a6ec1
--- /dev/null
+++ b/src/utils/hasTplInterpolation.js
@@ -0,0 +1,9 @@
+/**
+ * Check whether a string has JS template literal interpolation or HTML-like template
+ *
+ * @param {string} string
+ * @return {boolean} If `true`, a string has template literal interpolation
+ */
+export default function(string) {
+  return /{.+?}/.test(string);
+}
diff --git a/src/utils/isStandardSelector.js b/src/utils/isStandardSelector.js
index f622814b..a7352837 100644
--- a/src/utils/isStandardSelector.js
+++ b/src/utils/isStandardSelector.js
@@ -1,5 +1,5 @@
-import isStandardSyntaxSelector from "stylelint/lib/utils/isStandardSyntaxSelector";
-import hasInterpolation from "stylelint/lib/utils/hasInterpolation";
+import isStandardSyntaxSelector from "./isStandardSyntaxSelector";
+import hasInterpolation from "./hasInterpolation";
 /**
  * Check whether a selector is standard
  *
diff --git a/src/utils/isStandardSyntaxProperty.js b/src/utils/isStandardSyntaxProperty.js
index afed3201..3d138471 100644
--- a/src/utils/isStandardSyntaxProperty.js
+++ b/src/utils/isStandardSyntaxProperty.js
@@ -1,11 +1,31 @@
-import isStandardSyntaxProperty from "stylelint/lib/utils/isStandardSyntaxProperty";
+import hasInterpolation from "./hasInterpolation";
 
 /**
  * Check whether a property is standard
  *
  * @param {string} property
- * @return {boolean} If `true`, the property is standard
+ * @returns {boolean}
  */
 export default function(property) {
-  return isStandardSyntaxProperty(property);
+  // SCSS var (e.g. $var: x), list (e.g. $list: (x)) or map (e.g. $map: (key:value))
+  if (property.startsWith("$")) {
+    return false;
+  }
+
+  // Less var (e.g. @var: x)
+  if (property.startsWith("@")) {
+    return false;
+  }
+
+  // Less append property value with space (e.g. transform+_: scale(2))
+  if (property.endsWith("+") || property.endsWith("+_")) {
+    return false;
+  }
+
+  // SCSS or Less interpolation
+  if (hasInterpolation(property)) {
+    return false;
+  }
+
+  return true;
 }
diff --git a/src/utils/isStandardSyntaxSelector.js b/src/utils/isStandardSyntaxSelector.js
new file mode 100644
index 00000000..71baa507
--- /dev/null
+++ b/src/utils/isStandardSyntaxSelector.js
@@ -0,0 +1,36 @@
+import hasInterpolation from "./hasInterpolation";
+
+/**
+ * Check whether a selector is standard
+ *
+ * @param {string} selector
+ * @returns {boolean}
+ */
+export default function(selector) {
+  // SCSS or Less interpolation
+  if (hasInterpolation(selector)) {
+    return false;
+  }
+
+  // SCSS placeholder selectors
+  if (selector.startsWith("%")) {
+    return false;
+  }
+
+  // Less :extend()
+  if (/:extend(\(.*?\))?/.test(selector)) {
+    return false;
+  }
+
+  // Less mixin with resolved nested selectors (e.g. .foo().bar or .foo(@a, @b)[bar])
+  if (/\.[a-z0-9-_]+\(.*\).+/i.test(selector)) {
+    return false;
+  }
+
+  // ERB template tags
+  if (selector.includes("<%") || selector.includes("%>")) {
+    return false;
+  }
+
+  return true;
+}