Convert project to esm

.gitignore

@@ -17,3 +17,4 @@ node_modules
 package-lock.json
 .nyc_output
 coverage
+dist

country-list.js

@@ -1,6 +1,4 @@
-'use strict'
-
-var data = require('./data.json')
+import data from './data.json'
 
 /** Precompute name and code lookups. */
 var nameMap = {}
@@ -12,7 +10,7 @@ function mapCodeAndName (country) {
   codeMap[country.code.toLowerCase()] = country.name
 }
 
-exports.overwrite = function overwrite (countries) {
+export function overwrite (countries) {
   if (!countries || !countries.length) return
   countries.forEach(function (country) {
     var foundIndex = data.findIndex(function (item) {
@@ -23,34 +21,34 @@ exports.overwrite = function overwrite (countries) {
   })
 }
 
-exports.getCode = function getCode (name) {
+export function getCode (name) {
   return nameMap[name.toLowerCase()]
 }
 
-exports.getName = function getName (code) {
+export function getName (code) {
   return codeMap[code.toLowerCase()]
 }
 
-exports.getNames = function getNames () {
+export function getNames () {
   return data.map(function (country) {
     return country.name
   })
 }
 
-exports.getCodes = function getCodes () {
+export function getCodes () {
   return data.map(function (country) {
     return country.code
   })
 }
 
-exports.getCodeList = function getCodeList () {
+export function getCodeList () {
   return codeMap
 }
 
-exports.getNameList = function getNameList () {
+export function getNameList () {
   return nameMap
 }
 
-exports.getData = function getData () {
+export function getData () {
   return data
 }

package.json

@@ -2,19 +2,25 @@
   "name": "country-list",
   "version": "2.1.1",
   "description": "Maps ISO 3166-1-alpha-2 codes to English country names and vice versa.",
-  "main": "country-list.js",
+  "main": "dist/country-list.cjs.js",
+  "module": "dist/country-list.esm.js",
   "files": [
-    "data.json"
+    "data.json",
+    "dist"
   ],
   "dependencies": {},
   "devDependencies": {
     "csv-parser": "^1.11.0",
+    "rollup": "^1.15.6",
+    "rollup-plugin-json": "^4.0.0",
     "standard": "^12.0.1",
-    "tap": "^12.0.1"
+    "tap": "^14.6.1"
   },
   "scripts": {
     "pretest": "standard",
-    "test": "tap test/*.js --100"
+    "test": "tap test/*.js --100",
+    "build": "rollup -c",
+    "prepublishOnly": "rollup -c"
   },
   "repository": {
     "type": "git",

rollup.config.js

@@ -0,0 +1,15 @@
+import json from 'rollup-plugin-json'
+import pkg from './package.json'
+
+export default [
+  {
+    input: './country-list.js',
+    output: { file: pkg.main, format: 'cjs' },
+    plugins: [json()]
+  },
+  {
+    input: './country-list.js',
+    output: { file: pkg.module, format: 'esm' },
+    plugins: [json()]
+  }
+]

test/get-code-list.js

@@ -1,8 +1,6 @@
-'use strict'
-
-var { test } = require('tap')
-var { getCodeList } = require('../')
-var data = require('../data.json')
+import { test } from 'tap'
+import { getCodeList } from '../country-list.js'
+import data from '../data.json'
 
 test('get all country names with code as key', function (t) {
   var list = getCodeList()

test/get-code.js

@@ -1,7 +1,5 @@
-'use strict'
-
-var { test } = require('tap')
-var { getCode } = require('../')
+import { test } from 'tap'
+import { getCode } from '../country-list.js'
 
 test('get code from country name', function (t) {
   t.equal(getCode('Iceland'), 'IS', 'name "Iceland" should return IS')

test/get-codes.js

@@ -1,8 +1,6 @@
-'use strict'
-
-var { test } = require('tap')
-var { getCodes } = require('../')
-var data = require('../data.json')
+import { test } from 'tap'
+import { getCodes } from '../country-list.js'
+import data from '../data.json'
 
 test('get all country codes', function (t) {
   t.equal(getCodes().length, data.length, 'codes should be as many as countries')

test/get-data.js

@@ -1,8 +1,6 @@
-'use strict'
-
-var { test } = require('tap')
-var { getData } = require('../')
-var data = require('../data.json')
+import { test } from 'tap'
+import { getData } from '../country-list.js'
+import data from '../data.json'
 
 test('get all country names', function (t) {
   t.equal(getData().length, data.length, 'data list should be the same lenght as data.json')

test/get-name-list.js

@@ -1,8 +1,6 @@
-'use strict'
-
-var { test } = require('tap')
-var { getNameList } = require('../')
-var data = require('../data.json')
+import { test } from 'tap'
+import { getNameList } from '../country-list.js'
+import data from '../data.json'
 
 test('get all country names with code as key', function (t) {
   var list = getNameList()

test/get-name.js

@@ -1,7 +1,5 @@
-'use strict'
-
-var { test } = require('tap')
-var { getName } = require('../')
+import { test } from 'tap'
+import { getName } from '../country-list.js'
 
 test('get name from country code', function (t) {
   t.equal(getName('IS'), 'Iceland', 'code "IS" should return Iceland')

test/get-names.js

@@ -1,8 +1,6 @@
-'use strict'
-
-var { test } = require('tap')
-var { getNames } = require('../')
-var data = require('../data.json')
+import { test } from 'tap'
+import { getNames } from '../country-list.js'
+import data from '../data.json'
 
 test('get all country names', function (t) {
   t.equal(getNames().length, data.length, 'country names should be as many as countries')

test/import.js

@@ -1,7 +1,5 @@
-'use strict'
-
-const { test } = require('tap')
-const { getCode, getName } = require('../')
+import { test } from 'tap'
+import { getCode, getName } from '../country-list.js'
 
 test('get code and name for country', t => {
   t.equal(getCode('Iceland'), 'IS', 'name "Iceland" should return IS')

test/overwrite.js

@@ -1,7 +1,5 @@
-'use strict'
-
-const { test } = require('tap')
-const { overwrite, getData, getName } = require('../')
+import { test } from 'tap'
+import { overwrite, getData, getName } from '../country-list.js'
 
 const correctedTW = {
   code: 'TW',