build: remove babel-plugin-add-module-exports

Since we have deprecated deep requires we no longer need the
module.exports from the individual v*.js files.

Since we now ship plain, non-babled deep require files on the top level
of the npm package for legacy CommonJS deep-require support we can
compensate for the lack of module.exports in there and instead simply
access the "default" export of the algorithm-specific modules.

This change was inspired by
webpack/webpack#7973 (comment)

.babelrc.js

@@ -3,7 +3,6 @@ module.exports = {
   plugins: [],
   env: {
     commonjs: {
-      plugins: ['babel-plugin-add-module-exports'],
       presets: [['@babel/preset-env', { targets: { node: '8' }, modules: 'commonjs' }]],
     },
     esmBrowser: {

package.json

@@ -52,7 +52,6 @@
     "@wdio/static-server-service": "6.0.13",
     "@wdio/sync": "6.0.15",
     "babel-eslint": "10.1.0",
-    "babel-plugin-add-module-exports": "1.0.2",
     "bundlewatch": "0.2.6",
     "eslint": "6.8.0",
     "eslint-config-prettier": "6.10.1",

v1.js

@@ -1,6 +1,6 @@
 const deprecate = require('./deprecate.js');
 
-const v1 = require('./dist/v1.js');
+const v1 = require('./dist/v1.js').default;
 
 module.exports = deprecate(
   v1,

v3.js

@@ -1,6 +1,6 @@
 const deprecate = require('./deprecate.js');
 
-const v3 = require('./dist/v3.js');
+const v3 = require('./dist/v3.js').default;
 
 module.exports = deprecate(
   v3,

v4.js

@@ -1,6 +1,6 @@
 const deprecate = require('./deprecate.js');
 
-const v4 = require('./dist/v4.js');
+const v4 = require('./dist/v4.js').default;
 
 module.exports = deprecate(
   v4,

v5.js

@@ -1,6 +1,6 @@
 const deprecate = require('./deprecate.js');
 
-const v5 = require('./dist/v5.js');
+const v5 = require('./dist/v5.js').default;
 
 module.exports = deprecate(
   v5,