diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 5e7840478..faa52a962 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -35,6 +35,7 @@ module.exports = {
     ],
     "no-implicit-coercion": "error",
     "no-inner-declarations": "error",
+    "no-lonely-if": "error",
     "no-restricted-syntax": [
       "error",
       // `!foo === bar` and `!foo !== bar`
@@ -152,6 +153,7 @@ module.exports = {
     "unicorn/new-for-builtins": "error",
     "unicorn/no-array-for-each": "error",
     "unicorn/no-array-push-push": "error",
+    "unicorn/no-lonely-if": "error",
     "unicorn/no-new-array": "error",
     "unicorn/no-unreadable-iife": "error",
     "unicorn/no-useless-length-check": "error",
diff --git a/src/cli/format.js b/src/cli/format.js
index 6eb7728bf..caa43e8e9 100644
--- a/src/cli/format.js
+++ b/src/cli/format.js
@@ -90,11 +90,9 @@ async function listDifferent(context, input, options, filename) {
         "No parser and no file path given, couldn't infer a parser."
       );
     }
-    if (!(await prettier.check(input, options))) {
-      if (!context.argv.write) {
-        context.logger.log(filename);
-        process.exitCode = 1;
-      }
+    if (!(await prettier.check(input, options)) && !context.argv.write) {
+      context.logger.log(filename);
+      process.exitCode = 1;
     }
   } catch (error) {
     context.logger.error(error.message);
diff --git a/src/document/printer.js b/src/document/printer.js
index 64773f299..d38ad960f 100644
--- a/src/document/printer.js
+++ b/src/document/printer.js
@@ -387,6 +387,7 @@ function printDocToString(doc, options) {
               // representation first to the most expanded. If a
               // group has these, we need to manually go through
               // these states and find the first one that fits.
+              // eslint-disable-next-line no-lonely-if
               if (doc.expandedStates) {
                 const mostExpanded = doc.expandedStates.at(-1);
 
diff --git a/src/language-css/clean.js b/src/language-css/clean.js
index 71c52aaed..8ff868f11 100644
--- a/src/language-css/clean.js
+++ b/src/language-css/clean.js
@@ -115,13 +115,11 @@ function clean(ast, newObj, parent) {
   if (ast.type === "selector-attribute") {
     newObj.attribute = newObj.attribute.trim();
 
-    if (newObj.namespace) {
-      if (typeof newObj.namespace === "string") {
-        newObj.namespace = newObj.namespace.trim();
+    if (newObj.namespace && typeof newObj.namespace === "string") {
+      newObj.namespace = newObj.namespace.trim();
 
-        if (newObj.namespace.length === 0) {
-          newObj.namespace = true;
-        }
+      if (newObj.namespace.length === 0) {
+        newObj.namespace = true;
       }
     }
 
diff --git a/src/language-css/parser-postcss.js b/src/language-css/parser-postcss.js
index 20cd3aa09..5baa659ba 100644
--- a/src/language-css/parser-postcss.js
+++ b/src/language-css/parser-postcss.js
@@ -160,13 +160,13 @@ function addTypePrefix(node, prefix, skipPrefix) {
     delete node.parent;
     for (const key in node) {
       addTypePrefix(node[key], prefix, skipPrefix);
-      if (key === "type" && typeof node[key] === "string") {
-        if (
-          !node[key].startsWith(prefix) &&
-          (!skipPrefix || !skipPrefix.test(node[key]))
-        ) {
-          node[key] = prefix + node[key];
-        }
+      if (
+        key === "type" &&
+        typeof node[key] === "string" &&
+        !node[key].startsWith(prefix) &&
+        (!skipPrefix || !skipPrefix.test(node[key]))
+      ) {
+        node[key] = prefix + node[key];
       }
     }
   }
diff --git a/src/language-html/print/children.js b/src/language-html/print/children.js
index 70238bdb6..6da03f347 100644
--- a/src/language-html/print/children.js
+++ b/src/language-html/print/children.js
@@ -170,16 +170,14 @@ function printChildren(path, options, print) {
         prevParts.push(hardline, hardline);
       } else if (prevBetweenLine === hardline) {
         prevParts.push(hardline);
+      } else if (isTextLikeNode(childNode.prev)) {
+        leadingParts.push(prevBetweenLine);
       } else {
-        if (isTextLikeNode(childNode.prev)) {
-          leadingParts.push(prevBetweenLine);
-        } else {
-          leadingParts.push(
-            ifBreak("", softline, {
-              groupId: groupIds[childIndex - 1],
-            })
-          );
-        }
+        leadingParts.push(
+          ifBreak("", softline, {
+            groupId: groupIds[childIndex - 1],
+          })
+        );
       }
     }
 
diff --git a/src/language-js/clean.js b/src/language-js/clean.js
index 10111d886..a4186cab6 100644
--- a/src/language-js/clean.js
+++ b/src/language-js/clean.js
@@ -28,17 +28,17 @@ function clean(ast, newObj, parent) {
   }
 
   if (
-    ast.type === "BigIntLiteral" ||
-    ast.type === "BigIntLiteralTypeAnnotation"
+    (ast.type === "BigIntLiteral" ||
+      ast.type === "BigIntLiteralTypeAnnotation") &&
+    newObj.value
   ) {
-    if (newObj.value) {
-      newObj.value = newObj.value.toLowerCase();
-    }
+    newObj.value = newObj.value.toLowerCase();
   }
-  if (ast.type === "BigIntLiteral" || ast.type === "Literal") {
-    if (newObj.bigint) {
-      newObj.bigint = newObj.bigint.toLowerCase();
-    }
+  if (
+    (ast.type === "BigIntLiteral" || ast.type === "Literal") &&
+    newObj.bigint
+  ) {
+    newObj.bigint = newObj.bigint.toLowerCase();
   }
 
   if (ast.type === "DecimalLiteral") {
diff --git a/src/language-js/utils/index.js b/src/language-js/utils/index.js
index 977918f87..f6b8bff5e 100644
--- a/src/language-js/utils/index.js
+++ b/src/language-js/utils/index.js
@@ -511,24 +511,23 @@ function isTestCall(node, parent) {
     if (isUnitTestSetUp(node)) {
       return isAngularTestWrapper(node.arguments[0]);
     }
-  } else if (node.arguments.length === 2 || node.arguments.length === 3) {
-    if (
-      (node.arguments[0].type === "TemplateLiteral" ||
-        isStringLiteral(node.arguments[0])) &&
-      isTestCallCallee(node.callee)
-    ) {
-      // it("name", () => { ... }, 2500)
-      if (node.arguments[2] && !isNumericLiteral(node.arguments[2])) {
-        return false;
-      }
-      return (
-        (node.arguments.length === 2
-          ? isFunctionOrArrowExpression(node.arguments[1])
-          : isFunctionOrArrowExpressionWithBody(node.arguments[1]) &&
-            getFunctionParameters(node.arguments[1]).length <= 1) ||
-        isAngularTestWrapper(node.arguments[1])
-      );
+  } else if (
+    (node.arguments.length === 2 || node.arguments.length === 3) &&
+    (node.arguments[0].type === "TemplateLiteral" ||
+      isStringLiteral(node.arguments[0])) &&
+    isTestCallCallee(node.callee)
+  ) {
+    // it("name", () => { ... }, 2500)
+    if (node.arguments[2] && !isNumericLiteral(node.arguments[2])) {
+      return false;
     }
+    return (
+      (node.arguments.length === 2
+        ? isFunctionOrArrowExpression(node.arguments[1])
+        : isFunctionOrArrowExpressionWithBody(node.arguments[1]) &&
+          getFunctionParameters(node.arguments[1]).length <= 1) ||
+      isAngularTestWrapper(node.arguments[1])
+    );
   }
   return false;
 }