Use prettier for linting and code formatting via eslint

.eslintrc.js

@@ -1,7 +1,11 @@
 module.exports = {
-  extends: 'semistandard',
   env: {
     browser: true,
     node: true
+  },
+  extends: ["prettier"],
+  plugins: ["prettier"],
+  rules: {
+    "prettier/prettier": "error"
   }
 };

package.json

@@ -26,8 +26,10 @@
   },
   "devDependencies": {
     "eslint": "^4.1.1",
-    "eslint-config-semistandard": "^11.0.0",
-    "mocha": "^3.4.2"
+    "eslint-config-prettier": "^2.3.0",
+    "eslint-plugin-prettier": "^2.2.0",
+    "mocha": "^3.4.2",
+    "prettier": "^1.5.3"
   },
   "scripts": {
     "lint": "eslint . --fix",

src/base58.js

@@ -1,32 +1,38 @@
-var alphabet = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ';
+var alphabet = "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
 var base = alphabet.length;
 
 // Create a lookup table to fetch character index
-var alphabetLookup = alphabet.split('').reduce(function (lookup, char, index) {
+var alphabetLookup = alphabet.split("").reduce(function(lookup, char, index) {
   lookup[char] = index;
   return lookup;
 }, {});
 
-function assertNonNegativeSafeInteger (val) {
-  if (typeof val !== 'number' || isNaN(val) || val < 0 || val > Number.MAX_SAFE_INTEGER || Math.floor(val) !== val) {
-    throw new Error('Value passed is not a non-negative safe integer.');
+function assertNonNegativeSafeInteger(val) {
+  if (
+    typeof val !== "number" ||
+    isNaN(val) ||
+    val < 0 ||
+    val > Number.MAX_SAFE_INTEGER ||
+    Math.floor(val) !== val
+  ) {
+    throw new Error("Value passed is not a non-negative safe integer.");
   }
 }
 
-function assertString (str) {
-  if (typeof str !== 'string') {
-    throw new Error('Value passed is not a string.');
+function assertString(str) {
+  if (typeof str !== "string") {
+    throw new Error("Value passed is not a string.");
   }
 }
 
-function assertBase58Character (character) {
+function assertBase58Character(character) {
   if (alphabetLookup[character] === undefined) {
-    throw new Error('Value passed is not a valid Base58 string.');
+    throw new Error("Value passed is not a valid Base58 string.");
   }
 }
 
-exports.encode = function (num) {
-  var str = '';
+exports.encode = function(num) {
+  var str = "";
   var modulus;
 
   num = Number(num);
@@ -42,10 +48,10 @@ exports.encode = function (num) {
   return alphabet[num] + str;
 };
 
-exports.decode = function (str) {
+exports.decode = function(str) {
   assertString(str);
 
-  return str.split('').reverse().reduce(function (num, character, index) {
+  return str.split("").reverse().reduce(function(num, character, index) {
     assertBase58Character(character);
     return num + alphabetLookup[character] * Math.pow(base, index);
   }, 0);

test/base58.test.js

@@ -1,112 +1,138 @@
-var assert = require('assert');
-var examples = require('./examples');
-var base58 = require('..');
+var assert = require("assert");
+var examples = require("./examples");
+var base58 = require("..");
 
-function exampleRunner (callback) {
-  Object.keys(examples).forEach(function (str) {
+function exampleRunner(callback) {
+  Object.keys(examples).forEach(function(str) {
     callback(str, examples[str]);
   });
 }
 
-describe('Base58', function () {
-  before(function () {
+describe("Base58", function() {
+  before(function() {
     var valid = true;
     var count = 0;
 
-    exampleRunner(function (str, num) {
+    exampleRunner(function(str, num) {
       count++;
-      if (typeof str !== 'string') {
+      if (typeof str !== "string") {
         valid = false;
       }
-      if (typeof num !== 'number') {
+      if (typeof num !== "number") {
         valid = false;
       }
     });
 
-    assert.strictEqual(count > 0, true, 'Expected there to be examples');
-    assert.strictEqual(valid, true, 'Expected the examples to be valid');
+    assert.strictEqual(count > 0, true, "Expected there to be examples");
+    assert.strictEqual(valid, true, "Expected the examples to be valid");
   });
 
-  describe('.encode', function () {
-    it('encodes number to Base58 string', function () {
-      exampleRunner(function (str, num) {
+  describe(".encode", function() {
+    it("encodes number to Base58 string", function() {
+      exampleRunner(function(str, num) {
         assert.strictEqual(base58.encode(num), str);
       });
     });
 
-    describe('when passed a string only containing numbers', function () {
-      it('encodes string after first converting it to an integer', function () {
-        exampleRunner(function (str, num) {
+    describe("when passed a string only containing numbers", function() {
+      it("encodes string after first converting it to an integer", function() {
+        exampleRunner(function(str, num) {
           assert.strictEqual(base58.encode(num.toString()), str);
         });
       });
     });
 
-    describe('when passed a non number', function () {
-      it('throws an error', function () {
-        assert.throws(function () {
-          base58.encode('hi');
-        }, function (err) {
-          return err.message === 'Value passed is not a non-negative safe integer.';
-        });
+    describe("when passed a non number", function() {
+      it("throws an error", function() {
+        assert.throws(
+          function() {
+            base58.encode("hi");
+          },
+          function(err) {
+            return (
+              err.message === "Value passed is not a non-negative safe integer."
+            );
+          }
+        );
       });
     });
 
-    describe('when passed a float', function () {
-      it('throws an error', function () {
-        assert.throws(function () {
-          base58.encode(3.14);
-        }, function (err) {
-          return err.message === 'Value passed is not a non-negative safe integer.';
-        });
+    describe("when passed a float", function() {
+      it("throws an error", function() {
+        assert.throws(
+          function() {
+            base58.encode(3.14);
+          },
+          function(err) {
+            return (
+              err.message === "Value passed is not a non-negative safe integer."
+            );
+          }
+        );
       });
     });
 
-    describe('when passed a negative number', function () {
-      it('throws an error', function () {
-        assert.throws(function () {
-          base58.encode(-300);
-        }, function (err) {
-          return err.message === 'Value passed is not a non-negative safe integer.';
-        });
+    describe("when passed a negative number", function() {
+      it("throws an error", function() {
+        assert.throws(
+          function() {
+            base58.encode(-300);
+          },
+          function(err) {
+            return (
+              err.message === "Value passed is not a non-negative safe integer."
+            );
+          }
+        );
       });
     });
 
-    describe('when passed a non-safe integer', function () {
-      it('throws an error', function () {
-        assert.throws(function () {
-          base58.encode(1E100);
-        }, function (err) {
-          return err.message === 'Value passed is not a non-negative safe integer.';
-        });
+    describe("when passed a non-safe integer", function() {
+      it("throws an error", function() {
+        assert.throws(
+          function() {
+            base58.encode(1e100);
+          },
+          function(err) {
+            return (
+              err.message === "Value passed is not a non-negative safe integer."
+            );
+          }
+        );
       });
     });
   });
 
-  describe('.decode', function () {
-    it('decodes base58 string to number', function () {
-      exampleRunner(function (str, num) {
+  describe(".decode", function() {
+    it("decodes base58 string to number", function() {
+      exampleRunner(function(str, num) {
         assert.strictEqual(base58.decode(str), num);
       });
     });
 
-    describe('when passed a non string', function () {
-      it('throws an error', function () {
-        assert.throws(function () {
-          base58.decode(123);
-        }, function (err) {
-          return err.message === 'Value passed is not a string.';
-        });
+    describe("when passed a non string", function() {
+      it("throws an error", function() {
+        assert.throws(
+          function() {
+            base58.decode(123);
+          },
+          function(err) {
+            return err.message === "Value passed is not a string.";
+          }
+        );
       });
     });
 
-    describe('when passed a non base58 string', function () {
-      it('throws an error', function () {
-        assert.throws(function () {
-          base58.decode('>_<');
-        }, function (err) {
-          return err.message === 'Value passed is not a valid Base58 string.';
-        });
+    describe("when passed a non base58 string", function() {
+      it("throws an error", function() {
+        assert.throws(
+          function() {
+            base58.decode(">_<");
+          },
+          function(err) {
+            return err.message === "Value passed is not a valid Base58 string.";
+          }
+        );
       });
     });
   });