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node_modules/is-what/build.js

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+/* eslint-disable */
+
+// npm install rollup-plugin-typescript2 typescript --save-dev
+import typescript from 'rollup-plugin-typescript2'
+// import { terser } from 'rollup-plugin-terser'
+// import resolve from 'rollup-plugin-node-resolve'
+
+// ------------------------------------------------------------------------------------------
+// formats
+// ------------------------------------------------------------------------------------------
+// amd – Asynchronous Module Definition, used with module loaders like RequireJS
+// cjs – CommonJS, suitable for Node and Browserify/Webpack
+// esm – Keep the bundle as an ES module file
+// iife – A self-executing function, suitable for inclusion as a <script> tag. (If you want to create a bundle for your application, you probably want to use this, because it leads to smaller file sizes.)
+// umd – Universal Module Definition, works as amd, cjs and iife all in one
+// system – Native format of the SystemJS loader
+
+// ------------------------------------------------------------------------------------------
+// setup
+// ------------------------------------------------------------------------------------------
+const pkg = require('./package.json')
+const name = pkg.name
+const className = name.replace(/(^\w|-\w)/g, c => c.replace('-', '').toUpperCase())
+const external = Object.keys(pkg.dependencies || [])
+const plugins = [
+  typescript({ useTsconfigDeclarationDir: true, tsconfigOverride: { exclude: ['test/**/*'] } }),
+]
+
+// ------------------------------------------------------------------------------------------
+// Builds
+// ------------------------------------------------------------------------------------------
+function defaults (config) {
+  // defaults
+  const defaults = {
+    plugins,
+    external,
+  }
+  // defaults.output
+  config.output = config.output.map(output => {
+    return Object.assign(
+      {
+        sourcemap: false,
+        name: className,
+        exports: 'named',
+      },
+      output
+    )
+  })
+  return Object.assign(defaults, config)
+}
+
+export default [
+  defaults({
+    input: 'src/index.ts',
+    output: [
+      { file: 'dist/index.cjs.js', format: 'cjs' },
+      { file: 'dist/index.esm.js', format: 'esm' },
+    ],
+  }),
+]