(feature): convert to esm module

* Change require by import
* Fix jest configuration for esm module

.eslintrc.json

@@ -1,7 +1,8 @@
 {
     "extends": "eslint:recommended",
     "parserOptions": {
-        "ecmaVersion": 8
+        "ecmaVersion": 8,
+        "sourceType": "module"
     },
     "env": {
         "node": true,

__test__/generator.test.js

@@ -1,9 +1,9 @@
-const generator = require('./../src/generator.js');
-const validator = require('./../src/validator.js');
+import generator from './../src/generator.js';
+import validate from './../src/validator.js';
 
 test('should return a valid isbn according with the passed param', () => {
   const validIsbn = generator('10');
-  expect(validator(validIsbn)).toBe(true);
+  expect(validate(validIsbn)).toBe(true);
 });
 
 test('should return a isbn string with the correct length depending on when "title" attribute is not passed', () => {

__test__/validator.test.js

@@ -1,27 +1,27 @@
-const validator = require('./../src/validator');
+import validate from './../src/validator.js';
 
 // Valid ISBN 8497364678, 84-481-2231-3, 978-84-415-2682-2
 
-test('validator should return TRUE if passed value is a valid 10 numbers ISBN ', () => {
-  expect(validator('84 - 481 - 2231 - 3')).toBe(true);
-  expect(validator('84 - 481 2231- 3')).toBe(true);
-  expect(validator('84   481         2231        3')).toBe(true);
-  expect(validator('8448122313')).toBe(true);
-  expect(validator('84-481-2231-3')).toBe(true);
-  expect(validator('006095485X')).toBe(true);
+test('validate method should return TRUE if passed value is a valid 10 numbers ISBN ', () => {
+  expect(validate('84 - 481 - 2231 - 3')).toBe(true);
+  expect(validate('84 - 481 2231- 3')).toBe(true);
+  expect(validate('84   481         2231        3')).toBe(true);
+  expect(validate('8448122313')).toBe(true);
+  expect(validate('84-481-2231-3')).toBe(true);
+  expect(validate('006095485X')).toBe(true);
 });
 
-test('should return FALSE if passed string does not have the correct lenght', () => {
-  expect(validator('84 - 481 - 2231')).toBe(false);
-  expect(validator('848122313')).toBe(false);
-  expect(validator('isbn: 84-481-2231-3')).toBe(false);
+test('validate method should return FALSE if passed string does not have the correct lenght', () => {
+  expect(validate('84 - 481 - 2231')).toBe(false);
+  expect(validate('848122313')).toBe(false);
+  expect(validate('isbn: 84-481-2231-3')).toBe(false);
 });
 
-test('validator should return TRUE if passed value is a valid 13 numbers ISBN ', () => {
-  expect(validator('978-84-415-2682-2')).toBe(true);
-  expect(validator('978-34-2628-155-0')).toBe(true);
+test('validate method should return TRUE if passed value is a valid 13 numbers ISBN ', () => {
+  expect(validate('978-84-415-2682-2')).toBe(true);
+  expect(validate('978-34-2628-155-0')).toBe(true);
 });
 
-test('validator should return FALSE if passed value is NOT a valid 13 numbers ISBN ', () => {
-  expect(validator('978-0-306-40615-6')).toBe(false);
+test('validate method should return FALSE if passed value is NOT a valid 13 numbers ISBN ', () => {
+  expect(validate('978-0-306-40615-6')).toBe(false);
 });

babel.config.json

@@ -0,0 +1,5 @@
+{
+  "presets": [
+    "@babel/preset-env"
+  ]
+}

index.js

@@ -1,7 +1,4 @@
-const validate = require('./src/validator.js');
-const generate = require('./src/generator.js');
+import validate from './src/validator.js';
+import generate from './src/generator.js';
 
-module.exports = {
-  validate,
-  generate
-};
+export { validate, generate };

jest.config.js

@@ -1,7 +1,7 @@
 // For a detailed explanation regarding each configuration property, visit:
 // https://jestjs.io/docs/en/configuration.html
 
-module.exports = {
+export default {
   // All imported modules in your tests should be mocked automatically
   // automock: false,
 
@@ -170,7 +170,9 @@ module.exports = {
   // timers: "real",
 
   // A map from regular expressions to paths to transformers
-  // transform: undefined,
+  transform: {
+    "^.+\\.[t|j]sx?$": "babel-jest"
+  },
 
   // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
   // transformIgnorePatterns: [