diff --git a/src/language-css/parser-postcss.js b/src/language-css/parser-postcss.js
index 4d59a7d16..740f1a9ee 100644
--- a/src/language-css/parser-postcss.js
+++ b/src/language-css/parser-postcss.js
@@ -480,7 +480,7 @@ function parseNestedCSS(node) {
 
 function parseWithParser(parser, text) {
   const parsed = parseFrontMatter(text);
-  const frontMatter = parsed.frontMatter;
+  const { frontMatter } = parsed;
   text = parsed.content;
 
   let result;
diff --git a/src/language-graphql/printer-graphql.js b/src/language-graphql/printer-graphql.js
index 1f94a2708..289a0ea95 100644
--- a/src/language-graphql/printer-graphql.js
+++ b/src/language-graphql/printer-graphql.js
@@ -633,13 +633,11 @@ function canAttachComment(node) {
 
 function printComment(commentPath) {
   const comment = commentPath.getValue();
-
-  switch (comment.kind) {
-    case "Comment":
-      return "#" + comment.value.trimRight();
-    default:
-      throw new Error("Not a comment: " + JSON.stringify(comment));
+  if (comment.kind === "Comment") {
+    return "#" + comment.value.trimRight();
   }
+
+  throw new Error("Not a comment: " + JSON.stringify(comment));
 }
 
 function determineInterfaceSeparator(originalSource) {
diff --git a/src/language-handlebars/printer-glimmer.js b/src/language-handlebars/printer-glimmer.js
index 25daccc1c..fe1e4cb1a 100644
--- a/src/language-handlebars/printer-glimmer.js
+++ b/src/language-handlebars/printer-glimmer.js
@@ -298,7 +298,7 @@ function printOpenBlock(path, print) {
     concat([
       "{{#",
       printPathParams(path, print),
-      printBlockParams(path, print),
+      printBlockParams(path),
       softline,
       "}}"
     ])
diff --git a/src/language-html/embed.js b/src/language-html/embed.js
index 4b3ea62c0..7b8a14125 100644
--- a/src/language-html/embed.js
+++ b/src/language-html/embed.js
@@ -15,7 +15,7 @@ function embed(path, print, textToDoc, options) {
       // Inline JavaScript
       if (
         parent.type === "script" &&
-        ((!parent.attribs.lang && !parent.attribs.lang) ||
+        (!parent.attribs.lang ||
           parent.attribs.type === "text/javascript" ||
           parent.attribs.type === "application/javascript")
       ) {
diff --git a/src/main/options.js b/src/main/options.js
index 7738fa829..302f0c8b3 100644
--- a/src/main/options.js
+++ b/src/main/options.js
@@ -97,7 +97,7 @@ function normalize(options, opts) {
 }
 
 function getPlugin(options) {
-  const astFormat = options.astFormat;
+  const { astFormat } = options;
 
   if (!astFormat) {
     throw new Error("getPlugin() requires astFormat to be set");
diff --git a/src/main/parser.js b/src/main/parser.js
index 380131f02..914651236 100644
--- a/src/main/parser.js
+++ b/src/main/parser.js
@@ -4,8 +4,7 @@ const path = require("path");
 const ConfigError = require("../common/errors").ConfigError;
 const jsLoc = require("../language-js/loc");
 
-const locStart = jsLoc.locStart;
-const locEnd = jsLoc.locEnd;
+const { locStart, locEnd } = jsLoc;
 
 // Use defineProperties()/getOwnPropertyDescriptor() to prevent
 // triggering the parsers getters.
diff --git a/src/main/range-util.js b/src/main/range-util.js
index d124295b9..5793e79c4 100644
--- a/src/main/range-util.js
+++ b/src/main/range-util.js
@@ -191,8 +191,7 @@ function calculateRange(text, opts, ast) {
     endNodeAndParents,
     opts
   );
-  const startNode = siblingAncestors.startNode;
-  const endNode = siblingAncestors.endNode;
+  const { startNode, endNode } = siblingAncestors;
   const rangeStart = Math.min(
     opts.locStart(startNode, opts.locStart),
     opts.locStart(endNode, opts.locStart)