Fixes from PR feedback

Author: digitalsadhu

.eslintignore

@@ -1,9 +1 @@
-node_modules
-node_modules/**/*
-.DS_Store
-tmp/**/*
-.idea
-.idea/**/*
-*.iml
-*.log
 coverage

.eslintrc

@@ -5,6 +5,7 @@
     },
     "extends": ["finn", "finn/node"],
     "env": {
-        "node": true
+        "node": true,
+        "jest": true
     }
 }

lib/writer.js

@@ -13,7 +13,7 @@ module.exports = class Writer extends Readable {
 
         assert(
             Array.isArray(files) || typeof files === 'string',
-            `Expected 'files' to be of type 'Array' or a 'string', instead got '${typeof this.files}'`
+            `Expected 'files' to be of type 'Array' or a 'string', instead got '${typeof files}'`
         );
         this.files = Array.isArray(files) ? files : [files];
         for (const file of this.files) {

package.json

@@ -36,7 +36,7 @@
     },
     "scripts": {
         "format":
-            "prettier --write --single-quote --tab-width=4 lib/**/*.js test/**/*.js",
+            "prettier --write --single-quote --trailing-comma=all --tab-width=4 lib/**/*.js test/**/*.js",
         "lint": "eslint .",
         "test": "jest --coverage"
     },

test/__snapshots__/writer.test.js.snap

@@ -1,12 +1,12 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`new Writer([filePath]) ensures filePath is not an object 1`] = `"Expected 'files' to be of type 'Array' or a 'string', instead got 'undefined'"`;
+exports[`new Writer([filePath]) ensures filePath is not an object 1`] = `"Expected 'files' to be of type 'Array' or a 'string', instead got 'object'"`;
 
 exports[`new Writer([filePath]) ensures filePath[] is an array of strings 1`] = `"Expected 'file' (null) to be of type 'string', instead got 'object'"`;
 
-exports[`new Writer([filePath]) ensures filePath[] is not a number 1`] = `"Expected 'files' to be of type 'Array' or a 'string', instead got 'undefined'"`;
+exports[`new Writer([filePath]) ensures filePath[] is not a number 1`] = `"Expected 'files' to be of type 'Array' or a 'string', instead got 'number'"`;
 
-exports[`new Writer([filePath]) ensures filePath[] is not null 1`] = `"Expected 'files' to be of type 'Array' or a 'string', instead got 'undefined'"`;
+exports[`new Writer([filePath]) ensures filePath[] is not null 1`] = `"Expected 'files' to be of type 'Array' or a 'string', instead got 'object'"`;
 
 exports[`new Writer([filePath]) ensures valid filePath provided 1`] = `"Expected 'file' (fake.css) to be an absolute path to a file but it was not"`;