diff --git a/packages/definitions-parser/src/mocks.ts b/packages/definitions-parser/src/mocks.ts
index 6c4caf4f90..38b2863d3f 100644
--- a/packages/definitions-parser/src/mocks.ts
+++ b/packages/definitions-parser/src/mocks.ts
@@ -257,13 +257,13 @@ console.log(jQuery);
   );
 
   const allowedDep = dt.pkgDir("allowed-dep");
-  allowedDep.set("package.json", packageJson("allowed-dep", "1.0", { "prettier": "*" }));
+  allowedDep.set("package.json", packageJson("allowed-dep", "1.0", { prettier: "*" }));
 
   const nonAllowedDep = dt.pkgDir("non-allowed-dep");
   nonAllowedDep.set("package.json", packageJson("non-allowed-dep", "1.0", { "not-allowed": "*" }));
 
   const allowedPeerDep = dt.pkgDir("allowed-peer-dep");
-  allowedPeerDep.set("package.json", packageJson("allowed-peer-dep", "1.0", {}, { "prettier": "*" }));
+  allowedPeerDep.set("package.json", packageJson("allowed-peer-dep", "1.0", {}, { prettier: "*" }));
 
   const nonAllowedPeerDep = dt.pkgDir("non-allowed-peer-dep");
   nonAllowedPeerDep.set("package.json", packageJson("non-allowed-peer-dep", "1.0", {}, { "not-allowed-peer": "*" }));
@@ -299,7 +299,12 @@ ${testNames.map((s) => "        " + JSON.stringify(s)).join(",\n")}
 }`;
 }
 
-function packageJson(packageName: string, version: string, dependencies: Record<string, string>, peerDependencies?: Record<string, string>) {
+function packageJson(
+  packageName: string,
+  version: string,
+  dependencies: Record<string, string>,
+  peerDependencies?: Record<string, string>,
+) {
   return `{
     "private": true,
     "name": "@types/${packageName}",
@@ -314,11 +319,15 @@ function packageJson(packageName: string, version: string, dependencies: Record<
           .map(([name, version]) => `        "${name}": "${version}"`)
           .join(",\n")}
     },
-    ${peerDependencies ? `"peerDependencies": {
+    ${
+      peerDependencies
+        ? `"peerDependencies": {
         ${Object.entries(peerDependencies)
           .map(([name, version]) => `        "${name}": "${version}"`)
           .join(",\n")}
-    },` : ""}
+    },`
+        : ""
+    }
     "devDependencies": {
         "@types/${packageName}": "workspace:."
     }
diff --git a/packages/definitions-parser/test/definition-parser.test.ts b/packages/definitions-parser/test/definition-parser.test.ts
index a15369de7c..a6d6258bc0 100644
--- a/packages/definitions-parser/test/definition-parser.test.ts
+++ b/packages/definitions-parser/test/definition-parser.test.ts
@@ -442,7 +442,7 @@ import route = require('@ember/routing/route');
     return expect(getTypingInfo("non-allowed-dep", dt.fs)).resolves.toEqual({
       errors: [
         "In package.json: Dependency not-allowed not in the allowed dependencies list.\n" +
-        "Please make a pull request to microsoft/DefinitelyTyped-tools adding it to `packages/definitions-parser/allowedPackageJsonDependencies.txt`.",
+          "Please make a pull request to microsoft/DefinitelyTyped-tools adding it to `packages/definitions-parser/allowedPackageJsonDependencies.txt`.",
       ],
     });
   });
@@ -459,7 +459,7 @@ import route = require('@ember/routing/route');
     return expect(getTypingInfo("non-allowed-peer-dep", dt.fs)).resolves.toEqual({
       errors: [
         "In package.json: Dependency not-allowed-peer not in the allowed dependencies list.\n" +
-        "Please make a pull request to microsoft/DefinitelyTyped-tools adding it to `packages/definitions-parser/allowedPackageJsonDependencies.txt`.",
+          "Please make a pull request to microsoft/DefinitelyTyped-tools adding it to `packages/definitions-parser/allowedPackageJsonDependencies.txt`.",
       ],
     });
   });
diff --git a/packages/definitions-parser/test/packages.test.ts b/packages/definitions-parser/test/packages.test.ts
index 3674c5acbf..54b8ddb3e8 100644
--- a/packages/definitions-parser/test/packages.test.ts
+++ b/packages/definitions-parser/test/packages.test.ts
@@ -138,7 +138,7 @@ describe(TypingsData, () => {
       },
       {
         "peer-dependency-1": "*",
-      }
+      },
     );
     data = new TypingsData(dt.fs, versions["1.0"], true);
   });
diff --git a/packages/eslint-plugin/src/rules/no-import-of-dev-dependencies.ts b/packages/eslint-plugin/src/rules/no-import-of-dev-dependencies.ts
index 7c3e03cb62..c2d1848bbb 100644
--- a/packages/eslint-plugin/src/rules/no-import-of-dev-dependencies.ts
+++ b/packages/eslint-plugin/src/rules/no-import-of-dev-dependencies.ts
@@ -39,7 +39,12 @@ const rule = createRule({
         }
         return dep;
       })
-      .filter((dep) => dep !== info.realName && packageJson.dependencies?.[dep] === undefined && packageJson.peerDependencies?.[dep] === undefined); // TODO(jakebailey): add test for this case from https://github.com/microsoft/DefinitelyTyped-tools/pull/773
+      .filter(
+        (dep) =>
+          dep !== info.realName &&
+          packageJson.dependencies?.[dep] === undefined &&
+          packageJson.peerDependencies?.[dep] === undefined,
+      ); // TODO(jakebailey): add test for this case from https://github.com/microsoft/DefinitelyTyped-tools/pull/773
 
     commentsMatching(context.sourceCode, /<reference\s+types\s*=\s*"(.+)"\s*\/>/, (ref, comment) => {
       if (devDeps.includes(ref)) {
diff --git a/packages/mergebot/src/pr-info.ts b/packages/mergebot/src/pr-info.ts
index b79589861b..3a92a73275 100644
--- a/packages/mergebot/src/pr-info.ts
+++ b/packages/mergebot/src/pr-info.ts
@@ -467,7 +467,7 @@ configSuspicious["package.json"] = makeChecker({}, urls.packageJson, {
       return { peerDependencies: data.peerDependencies };
     }
     return {};
-  }
+  },
 });
 configSuspicious[".npmignore"] = () => undefined;
 configSuspicious["tsconfig.json"] = makeChecker(
diff --git a/packages/publisher/src/generate-packages.ts b/packages/publisher/src/generate-packages.ts
index 2125dec38a..522a008f0e 100644
--- a/packages/publisher/src/generate-packages.ts
+++ b/packages/publisher/src/generate-packages.ts
@@ -209,7 +209,9 @@ export function createReadme(typing: TypingsData, packageFS: FS): string {
   lines.push("");
   const peerDependencies = Object.keys(typing.peerDependencies).sort();
   if (peerDependencies.length) {
-    lines.push(` * Peer dependencies: ${peerDependencies.map((d) => `[${d}](https://npmjs.com/package/${d})`).join(", ")}`);
+    lines.push(
+      ` * Peer dependencies: ${peerDependencies.map((d) => `[${d}](https://npmjs.com/package/${d})`).join(", ")}`,
+    );
     lines.push("");
   }
 
diff --git a/packages/publisher/test/generate-packages.test.ts b/packages/publisher/test/generate-packages.test.ts
index dbdfaf2b29..4297029f9a 100644
--- a/packages/publisher/test/generate-packages.test.ts
+++ b/packages/publisher/test/generate-packages.test.ts
@@ -32,7 +32,7 @@ function createRawPackage(license: License): TypingsDataRaw {
     typesVersions: [],
     license,
     dependencies: { "@types/madeira": "^1" },
-    peerDependencies: { "@types/express": "*"},
+    peerDependencies: { "@types/express": "*" },
     devDependencies: { "@types/jquery": "workspace:." },
     olderVersionDirectories: [],
   };
@@ -58,7 +58,7 @@ function defaultFS() {
             { name: "E", githubUsername: "e" },
           ],
           dependencies: { "@types/madeira": "^1" },
-          peerDependencies: { "@types/express": "*"},
+          peerDependencies: { "@types/express": "*" },
           devDependencies: { "@types/jquery": "workspace:." },
         },
         undefined,