chore: use es6 modules syntax

.babelrc

@@ -1,5 +1,13 @@
 {
   "presets": [
-    "@babel/preset-env"
+    [
+      "@babel/preset-env", {
+        "modules": "cjs"
+      }
+    ]
+  ],
+
+  "plugins": [
+    "add-module-exports"
   ]
 }

package.json

@@ -46,6 +46,7 @@
     "@babel/core": "7.9.0",
     "@babel/preset-env": "7.9.0",
     "@babel/register": "7.9.0",
+    "babel-plugin-add-module-exports": "^1.0.2",
     "eslint": "6.8.0",
     "eslint-config-google": "0.14.0",
     "fancy-log": "1.3.3",

scripts/log/index.js

@@ -22,8 +22,6 @@
  * THE SOFTWARE.
  */
 
-'use strict';
-
 const log = require('fancy-log');
 const colors = require('ansi-colors');
 

src/.eslintrc

@@ -0,0 +1,5 @@
+{
+  "parserOptions": {
+    "sourceType": "module"
+  }
+}

src/dependency.js

@@ -22,16 +22,14 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-const _ = require('lodash');
-const EOL = require('./eol.js');
-const Person = require('./person.js');
+import _ from 'lodash';
+import {EOL} from './eol.js';
+import {Person} from './person.js';
 
 /**
  * Dependency structure.
  */
-module.exports = class Dependency {
+export class Dependency {
   /**
    * Create new dependency from package description.
    *
@@ -118,4 +116,4 @@ module.exports = class Dependency {
 
     return lines.join(EOL);
   }
-};
+}

src/eol.js

@@ -22,6 +22,4 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-module.exports = '\n';
+export const EOL = '\n';

src/format-path.js

@@ -22,17 +22,15 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-const _ = require('lodash');
+import _ from 'lodash';
 
 /**
  * Format given array of path to a human readable path.
  *
  * @param {Array<string|number>} paths List of paths.
  * @return {string} The full path.
  */
-function formatPath(paths) {
+export function formatPath(paths) {
   let str = '';
 
   _.forEach(paths, (p) => {
@@ -47,5 +45,3 @@ function formatPath(paths) {
 
   return str;
 }
-
-module.exports = formatPath;

src/generate-block-comment.js

@@ -22,9 +22,7 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-const commenting = require('commenting');
+import commenting from 'commenting';
 
 /**
  * Generate block comment from given text content.
@@ -33,7 +31,7 @@ const commenting = require('commenting');
  * @param {Object} commentStyle The comment style setting.
  * @return {string} Block comment.
  */
-module.exports = function generateBlockComment(text, commentStyle) {
+export function generateBlockComment(text, commentStyle) {
   const options = {
     extension: '.js',
   };
@@ -47,4 +45,4 @@ module.exports = function generateBlockComment(text, commentStyle) {
   }
 
   return commenting(text.trim(), options);
-};
+}

src/index-rollup-legacy.js

@@ -22,12 +22,16 @@
  * SOFTWARE.
  */
 
-'use strict';
+import _ from 'lodash';
+import {licensePlugin} from './license-plugin.js';
 
-const _ = require('lodash');
-const licensePlugin = require('./license-plugin.js');
-
-module.exports = (options = {}) => {
+/**
+ * Create rollup plugin compatible with rollup < 1.0.0
+ *
+ * @param {Object} options Plugin options.
+ * @return {Object} Plugin instance.
+ */
+export function licensePluginLegacy(options = {}) {
   const plugin = licensePlugin(options);
 
   return {
@@ -96,4 +100,4 @@ module.exports = (options = {}) => {
       plugin.scanThirdParties();
     },
   };
-};
+}

src/index-rollup-stable.js

@@ -22,12 +22,16 @@
  * SOFTWARE.
  */
 
-'use strict';
+import _ from 'lodash';
+import {licensePlugin} from './license-plugin.js';
 
-const _ = require('lodash');
-const licensePlugin = require('./license-plugin.js');
-
-module.exports = (options = {}) => {
+/**
+ * Create rollup plugin compatible with rollup >= 1.0.0
+ *
+ * @param {Object} options Plugin options.
+ * @return {Object} Plugin instance.
+ */
+export function licensePluginStable(options = {}) {
   const plugin = licensePlugin(options);
 
   return {
@@ -70,4 +74,4 @@ module.exports = (options = {}) => {
       plugin.scanThirdParties();
     },
   };
-};
+}

src/index.js

@@ -22,11 +22,14 @@
  * SOFTWARE.
  */
 
-'use strict';
 
-const rollup = require('rollup');
+import * as rollup from 'rollup';
+import {licensePluginLegacy} from './index-rollup-legacy';
+import {licensePluginStable} from './index-rollup-stable';
+
 const VERSION = rollup.VERSION;
 const MAJOR_VERSION = VERSION ? Number(VERSION.split('.')[0]) : 0;
 const IS_ROLLUP_LEGACY = MAJOR_VERSION === 0;
+const plugin = IS_ROLLUP_LEGACY ? licensePluginLegacy : licensePluginStable;
 
-module.exports = IS_ROLLUP_LEGACY ? require('./index-rollup-legacy') : require('./index-rollup-stable');
+export default plugin;

src/license-plugin-name.js

@@ -22,10 +22,8 @@
  * SOFTWARE.
  */
 
-'use strict';
-
 /**
  * The plugin name.
  * @type {string}
  */
-module.exports = 'rollup-plugin-license';
+export const PLUGIN_NAME = 'rollup-plugin-license';

src/license-plugin-option.js

@@ -22,13 +22,11 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-const _ = require('lodash');
-const PLUGIN_NAME = require('./license-plugin-name.js');
-const validators = require('./schema-validators.js');
-const validateSchema = require('./schema-validator.js');
-const formatPath = require('./format-path.js');
+import _ from 'lodash';
+import {PLUGIN_NAME} from './license-plugin-name.js';
+import {validators} from './schema-validators.js';
+import {validateSchema} from './schema-validator.js';
+import {formatPath} from './format-path.js';
 
 /**
  * The option object schema.
@@ -299,10 +297,10 @@ function validateOptions(options) {
  * @param {Object} options Option object to validate.
  * @return {Object} New normalized options.
  */
-module.exports = function licensePluginOption(options) {
+export function licensePluginOptions(options) {
   const normalizedOptions = normalizeOptions(options);
 
   validateOptions(normalizedOptions);
 
   return normalizedOptions;
-};
+}

src/license-plugin.js

@@ -22,22 +22,20 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-const fs = require('fs');
-const path = require('path');
-const mkdirp = require('mkdirp');
-const _ = require('lodash');
-const moment = require('moment');
-const MagicString = require('magic-string');
-const glob = require('glob');
-
-const Dependency = require('./dependency.js');
-const generateBlockComment = require('./generate-block-comment.js');
-const licensePluginOptions = require('./license-plugin-option.js');
-const licenseValidator = require('./license-validator');
-const PLUGIN_NAME = require('./license-plugin-name.js');
-const EOL = require('./eol.js');
+import fs from 'fs';
+import path from 'path';
+import mkdirp from 'mkdirp';
+import _ from 'lodash';
+import moment from 'moment';
+import MagicString from 'magic-string';
+import glob from 'glob';
+
+import {Dependency} from './dependency.js';
+import {generateBlockComment} from './generate-block-comment.js';
+import {licensePluginOptions} from './license-plugin-option.js';
+import {licenseValidator} from './license-validator';
+import {PLUGIN_NAME} from './license-plugin-name.js';
+import {EOL} from './eol.js';
 
 /**
  * Pre-Defined comment style:
@@ -544,8 +542,8 @@ class LicensePlugin {
  * @param {Object} options Option object.
  * @return {LicensePlugin} The new instance.
  */
-module.exports = function licensePlugin(options) {
+export function licensePlugin(options) {
   return new LicensePlugin(
       licensePluginOptions(options)
   );
-};
+}

src/license-validator.js

@@ -22,8 +22,8 @@
  * SOFTWARE.
  */
 
-const spdxExpressionValidate = require('spdx-expression-validate');
-const spdxSatisfies = require('spdx-satisfies');
+import spdxExpressionValidate from 'spdx-expression-validate';
+import spdxSatisfies from 'spdx-satisfies';
 
 /**
  * Normalize license name:
@@ -78,7 +78,7 @@ function isValid(dependency, allow) {
   return spdxExpressionValidate(license) && spdxSatisfies(license, allow);
 }
 
-module.exports = {
+export const licenseValidator = {
   isUnlicensed,
   isValid,
 };

src/person.js

@@ -22,17 +22,15 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-const _ = require('lodash');
+import _ from 'lodash';
 
 /**
  * Person, defined by:
  * - A name.
  * - An email (optional).
  * - An URL (optional).
  */
-module.exports = class Person {
+export class Person {
   /**
    * Create the person.
    *
@@ -94,4 +92,4 @@ module.exports = class Person {
 
     return text;
   }
-};
+}

src/schema-validator.js

@@ -22,10 +22,8 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-const _ = require('lodash');
-const formatPath = require('./format-path.js');
+import _ from 'lodash';
+import {formatPath} from './format-path.js';
 
 /**
  * Validate value against given schema.
@@ -147,4 +145,14 @@ function validate(obj, schema, current = []) {
   return _.isArray(obj) ? validateArray(obj, schema, current) : validateObject(obj, schema, current);
 }
 
-module.exports = validate;
+/**
+ * Validate given object against given schema.
+ *
+ * @param {Object} obj Object to validate.
+ * @param {Object} schema The schema against the given object will be validated.
+ * @param {Array<string>} current The current path context of given object, useful to validate against subobject.
+ * @return {Array<Object>} Found errors.
+ */
+export function validateSchema(obj, schema, current) {
+  return validate(obj, schema, current);
+}

src/schema-validators.js

@@ -22,9 +22,7 @@
  * SOFTWARE.
  */
 
-'use strict';
-
-const _ = require('lodash');
+import _ from 'lodash';
 
 /**
  * Check if given value is a `string`.
@@ -96,7 +94,7 @@ function isObject(value) {
   return _.isObject(value) && !isArray(value) && !isFunction(value) && !isNil(value) && !isString(value) && !isNumber(value);
 }
 
-module.exports = {
+export const validators = {
   string() {
     return {
       type: 'object.type.string',

test/.eslintrc

@@ -1,4 +1,7 @@
 {
+  "parserOptions": {
+    "sourceType": "module"
+  },
   "env": {
     "jasmine": true
   },