diff --git a/.eslintignore b/.eslintignore
index 04322373a523..edaf07d30d7c 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -8,6 +8,7 @@
 # - build directories and other items that we need to ignore
 
 !.eslintrc*.js
+!.prettierrc.js
 
 # Always ignore node_modules.
 **/node_modules/
diff --git a/.prettierrc b/.prettierrc
deleted file mode 100644
index b8039f84304a..000000000000
--- a/.prettierrc
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "endOfLine": "lf",
-  "printWidth": 80,
-  "tabWidth": 2,
-  "trailingComma": "es5"
-}
diff --git a/.prettierrc.js b/.prettierrc.js
new file mode 100644
index 000000000000..f80499fe0e94
--- /dev/null
+++ b/.prettierrc.js
@@ -0,0 +1,12 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* eslint-env node */
+
+module.exports = {
+  endOfLine: "lf",
+  printWidth: 80,
+  tabWidth: 2,
+  trailingComma: "es5",
+};
diff --git a/devtools/client/debugger/.prettierrc.js b/devtools/client/debugger/.prettierrc.js
index 71adaa1aa9e5..0740b7799711 100644
--- a/devtools/client/debugger/.prettierrc.js
+++ b/devtools/client/debugger/.prettierrc.js
@@ -2,23 +2,23 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-const fs = require("fs");
+"use strict";
+
+// eslint-disable-next-line mozilla/reject-relative-requires
+const topLevelPrettier = require("../../../.prettierrc.js");
 
 module.exports = {
-  ...JSON.parse(fs.readFileSync(__dirname + "/../../../.prettierrc")),
+  ...topLevelPrettier,
   overrides: [
     {
-      files: [
-        "src/**/*.js",
-        "packages/*/src/**/*.js",
-      ],
+      files: ["src/**/*.js", "packages/*/src/**/*.js"],
       options: {
         // The debugger uses Babel 7 and some newer Flow features.
         // Unfortunately, Prettier has not yet adopted a version of Babel's
         // parser with this fix: https://github.com/babel/babel/pull/9891
         // That necessitates us to override to config to explicitly tell
         // Prettier that our files contain Flowtype annotations.
-        "parser": "babel-flow"
+        parser: "babel-flow",
       },
     },
   ],