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node_modules/i18next-xhr-backend/rollup.config.js

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+import babel from 'rollup-plugin-babel';
+import nodeResolve from 'rollup-plugin-node-resolve';
+import { terser } from 'rollup-plugin-terser';
+import pkg from './package.json';
+
+const getBabelOptions = ({ useESModules }) => ({
+  exclude: /node_modules/,
+  runtimeHelpers: true,
+  plugins: [
+    ['@babel/transform-runtime', { useESModules }]
+  ]
+});
+
+const input = './src/index.js';
+const name = 'i18nextXHRBackend'
+// check relative and absolute paths for windows and unix
+const external = id => !id.startsWith('.') && !id.startsWith('/') && !id.includes(':');
+
+export default [
+  {
+    input,
+    output: { format: 'cjs', file: pkg.main },
+    external,
+    plugins: [
+      babel(getBabelOptions({ useESModules: false }))
+    ]
+  },
+
+  {
+    input,
+    output: { format: 'esm', file: pkg.module },
+    external,
+    plugins: [
+      babel(getBabelOptions({ useESModules: true }))
+    ]
+  },
+
+  {
+    input,
+    output: { format: 'umd', name, file: `dist/umd/${name}.js` },
+    plugins: [
+      babel(getBabelOptions({ useESModules: true })),
+      nodeResolve()
+    ],
+  },
+  {
+    input,
+    output: { format: 'umd', name, file: `dist/umd/${name}.min.js` },
+    plugins: [
+      babel(getBabelOptions({ useESModules: true })),
+      nodeResolve(),
+      terser()
+    ],
+  }
+]