diff --git a/services/filestore/config/settings.defaults.js b/services/filestore/config/settings.defaults.js
index 2327f50ea9..1d84cf529a 100644
--- a/services/filestore/config/settings.defaults.js
+++ b/services/filestore/config/settings.defaults.js
@@ -8,116 +8,140 @@
  * DS207: Consider shorter variations of null checks
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const Path = require("path");
+const Path = require('path')
 
 // environment variables renamed for consistency
 // use AWS_ACCESS_KEY_ID-style going forward
 if (process.env.AWS_KEY && !process.env.AWS_ACCESS_KEY_ID) {
-	process.env.AWS_ACCESS_KEY_ID = process.env.AWS_KEY;
+  process.env.AWS_ACCESS_KEY_ID = process.env.AWS_KEY
 }
 if (process.env.AWS_SECRET && !process.env.AWS_SECRET_ACCESS_KEY) {
-	process.env.AWS_SECRET_ACCESS_KEY = process.env.AWS_SECRET;
+  process.env.AWS_SECRET_ACCESS_KEY = process.env.AWS_SECRET
 }
 
 // pre-backend setting, fall back to old behaviour
 if (process.env.BACKEND == null) {
-	if ((process.env.AWS_ACCESS_KEY_ID != null) || (process.env.S3_BUCKET_CREDENTIALS != null)) {
-		process.env.BACKEND = "s3";
-		process.env.USER_FILES_BUCKET_NAME = process.env.AWS_S3_USER_FILES_BUCKET_NAME;
-		process.env.TEMPLATE_FILES_BUCKET_NAME = process.env.AWS_S3_TEMPLATE_FILES_BUCKET_NAME;
-		process.env.PUBLIC_FILES_BUCKET_NAME = process.env.AWS_S3_PUBLIC_FILES_BUCKET_NAME;
-	} else {
-		process.env.BACKEND = "fs";
-		process.env.USER_FILES_BUCKET_NAME = Path.resolve(__dirname + "/../user_files");
-		process.env.TEMPLATE_FILES_BUCKET_NAME = Path.resolve(__dirname + "/../template_files");
-		process.env.PUBLIC_FILES_BUCKET_NAME = Path.resolve(__dirname + "/../public_files");
-	}
+  if (
+    process.env.AWS_ACCESS_KEY_ID != null ||
+    process.env.S3_BUCKET_CREDENTIALS != null
+  ) {
+    process.env.BACKEND = 's3'
+    process.env.USER_FILES_BUCKET_NAME =
+      process.env.AWS_S3_USER_FILES_BUCKET_NAME
+    process.env.TEMPLATE_FILES_BUCKET_NAME =
+      process.env.AWS_S3_TEMPLATE_FILES_BUCKET_NAME
+    process.env.PUBLIC_FILES_BUCKET_NAME =
+      process.env.AWS_S3_PUBLIC_FILES_BUCKET_NAME
+  } else {
+    process.env.BACKEND = 'fs'
+    process.env.USER_FILES_BUCKET_NAME = Path.resolve(
+      __dirname + '/../user_files'
+    )
+    process.env.TEMPLATE_FILES_BUCKET_NAME = Path.resolve(
+      __dirname + '/../template_files'
+    )
+    process.env.PUBLIC_FILES_BUCKET_NAME = Path.resolve(
+      __dirname + '/../public_files'
+    )
+  }
 }
 
 const settings = {
-	internal: {
-		filestore: {
-			port: 3009,
-			host: process.env.LISTEN_ADDRESS || "localhost"
-		}
-	},
+  internal: {
+    filestore: {
+      port: 3009,
+      host: process.env.LISTEN_ADDRESS || 'localhost'
+    }
+  },
 
-	filestore: {
-		// Which backend persistor to use.
-		// Choices are
-		// s3 - Amazon S3
-		// fs - local filesystem
-		// gcs - Google Cloud Storage
-		backend: process.env.BACKEND,
+  filestore: {
+    // Which backend persistor to use.
+    // Choices are
+    // s3 - Amazon S3
+    // fs - local filesystem
+    // gcs - Google Cloud Storage
+    backend: process.env.BACKEND,
 
-		gcs: {
-			endpoint:
-				process.env.GCS_API_ENDPOINT ?{
-					apiEndpoint: process.env.GCS_API_ENDPOINT,
-					apiScheme: process.env.GCS_API_SCHEME,
-					projectId: process.env.GCS_PROJECT_ID
-				} : undefined,
-			unlockBeforeDelete: process.env.GCS_UNLOCK_BEFORE_DELETE === "true",  // unlock an event-based hold before deleting. default false
-			deletedBucketSuffix: process.env.GCS_DELETED_BUCKET_SUFFIX,          // if present, copy file to another bucket on delete. default null
-			deleteConcurrency: parseInt(process.env.GCS_DELETE_CONCURRENCY) || 50,
-			signedUrlExpiryInMs: parseInt(process.env.LINK_EXPIRY_TIMEOUT || 60000)
-		},
+    gcs: {
+      endpoint: process.env.GCS_API_ENDPOINT
+        ? {
+            apiEndpoint: process.env.GCS_API_ENDPOINT,
+            apiScheme: process.env.GCS_API_SCHEME,
+            projectId: process.env.GCS_PROJECT_ID
+          }
+        : undefined,
+      unlockBeforeDelete: process.env.GCS_UNLOCK_BEFORE_DELETE === 'true', // unlock an event-based hold before deleting. default false
+      deletedBucketSuffix: process.env.GCS_DELETED_BUCKET_SUFFIX, // if present, copy file to another bucket on delete. default null
+      deleteConcurrency: parseInt(process.env.GCS_DELETE_CONCURRENCY) || 50,
+      signedUrlExpiryInMs: parseInt(process.env.LINK_EXPIRY_TIMEOUT || 60000)
+    },
 
-		s3:
-			(process.env.AWS_ACCESS_KEY_ID != null) || (process.env.S3_BUCKET_CREDENTIALS != null) ?{
-				key: process.env.AWS_ACCESS_KEY_ID,
-				secret: process.env.AWS_SECRET_ACCESS_KEY,
-				endpoint: process.env.AWS_S3_ENDPOINT,
-				pathStyle: process.env.AWS_S3_PATH_STYLE,
-				partSize: process.env.AWS_S3_PARTSIZE || (100 * 1024 * 1024),
-				bucketCreds: ((process.env.S3_BUCKET_CREDENTIALS != null) ? JSON.parse(process.env.S3_BUCKET_CREDENTIALS) : undefined)
-			} : undefined,
+    s3:
+      process.env.AWS_ACCESS_KEY_ID != null ||
+      process.env.S3_BUCKET_CREDENTIALS != null
+        ? {
+            key: process.env.AWS_ACCESS_KEY_ID,
+            secret: process.env.AWS_SECRET_ACCESS_KEY,
+            endpoint: process.env.AWS_S3_ENDPOINT,
+            pathStyle: process.env.AWS_S3_PATH_STYLE,
+            partSize: process.env.AWS_S3_PARTSIZE || 100 * 1024 * 1024,
+            bucketCreds:
+              process.env.S3_BUCKET_CREDENTIALS != null
+                ? JSON.parse(process.env.S3_BUCKET_CREDENTIALS)
+                : undefined
+          }
+        : undefined,
 
-		// GCS should be configured by the service account on the kubernetes pod. See GOOGLE_APPLICATION_CREDENTIALS,
-		// which will be picked up automatically.
+    // GCS should be configured by the service account on the kubernetes pod. See GOOGLE_APPLICATION_CREDENTIALS,
+    // which will be picked up automatically.
 
-		stores: {
-			user_files: process.env.USER_FILES_BUCKET_NAME,
-			template_files: process.env.TEMPLATE_FILES_BUCKET_NAME,
-			public_files: process.env.PUBLIC_FILES_BUCKET_NAME
-		},
+    stores: {
+      user_files: process.env.USER_FILES_BUCKET_NAME,
+      template_files: process.env.TEMPLATE_FILES_BUCKET_NAME,
+      public_files: process.env.PUBLIC_FILES_BUCKET_NAME
+    },
 
-		fallback:
-			(process.env.FALLBACK_BACKEND != null) ?{
-				backend: process.env.FALLBACK_BACKEND,
-				// mapping of bucket names on the fallback, to bucket names on the primary.
-				// e.g. { myS3UserFilesBucketName: 'myGoogleUserFilesBucketName' }
-				buckets: JSON.parse(process.env.FALLBACK_BUCKET_MAPPING || '{}'),
-				copyOnMiss: process.env.COPY_ON_MISS === 'true'
-			} : undefined,
+    fallback:
+      process.env.FALLBACK_BACKEND != null
+        ? {
+            backend: process.env.FALLBACK_BACKEND,
+            // mapping of bucket names on the fallback, to bucket names on the primary.
+            // e.g. { myS3UserFilesBucketName: 'myGoogleUserFilesBucketName' }
+            buckets: JSON.parse(process.env.FALLBACK_BUCKET_MAPPING || '{}'),
+            copyOnMiss: process.env.COPY_ON_MISS === 'true'
+          }
+        : undefined,
 
-		allowRedirects: process.env.ALLOW_REDIRECTS === 'true'
-	},
+    allowRedirects: process.env.ALLOW_REDIRECTS === 'true'
+  },
 
-	path: {
-		uploadFolder: Path.resolve(__dirname + "/../uploads")
-	},
+  path: {
+    uploadFolder: Path.resolve(__dirname + '/../uploads')
+  },
 
-	commands: {
-		// Any commands to wrap the convert utility in, for example ["nice"], or ["firejail", "--profile=/etc/firejail/convert.profile"]
-		convertCommandPrefix: []
-	},
+  commands: {
+    // Any commands to wrap the convert utility in, for example ["nice"], or ["firejail", "--profile=/etc/firejail/convert.profile"]
+    convertCommandPrefix: []
+  },
 
-	enableConversions: process.env.ENABLE_CONVERSIONS === 'true',
+  enableConversions: process.env.ENABLE_CONVERSIONS === 'true',
 
-	sentry: {
-		dsn: process.env.SENTRY_DSN
-	}
-};
+  sentry: {
+    dsn: process.env.SENTRY_DSN
+  }
+}
 
 // Filestore health check
 // ----------------------
 // Project and file details to check in persistor when calling /health_check
-if ((process.env.HEALTH_CHECK_PROJECT_ID != null) && (process.env.HEALTH_CHECK_FILE_ID != null)) {
-	settings.health_check = {
-		project_id: process.env.HEALTH_CHECK_PROJECT_ID,
-		file_id: process.env.HEALTH_CHECK_FILE_ID
-	};
+if (
+  process.env.HEALTH_CHECK_PROJECT_ID != null &&
+  process.env.HEALTH_CHECK_FILE_ID != null
+) {
+  settings.health_check = {
+    project_id: process.env.HEALTH_CHECK_PROJECT_ID,
+    file_id: process.env.HEALTH_CHECK_FILE_ID
+  }
 }
 
-module.exports = settings;
+module.exports = settings