Build System: added rollup to produce es2015 & es5 imports, flattened types file

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 dist
 coverage
+typings

package.json

@@ -1,9 +1,23 @@
 {
-  "version": "1.9.1",
+  "version": "2.0.0",
   "license": "MIT",
-  "main": "dist/index.js",
+  "main": "dist/index.cjs",
   "typings": "dist/index.d.ts",
-  "module": "dist/esm/index.js",
+  "module": "dist/index.mjs",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "require": "./dist/index.cjs",
+      "import": "./dist/index.mjs",
+      "default": "./dist/index.js"
+    },
+    "./es2015": {
+      "types": "./dist/es2015/index.d.ts",
+      "require": "./dist/es2015/index.cjs",
+      "import": "./dist/es2015/index.mjs",
+      "default": "./dist/es2015/index.js"
+    }
+  },
   "files": [
     "dist",
     "src"
@@ -12,9 +26,7 @@
     "node": ">=10"
   },
   "scripts": {
-    "build": "yarn build:cjs && yarn build:esm",
-    "build:cjs": "tsc",
-    "build:esm": "tsc --module es2015 --outDir dist/esm",
+    "build": "tsc --project tsconfig.d.json && NODE_ENV=production rollup -c rollup.config.js",
     "test": "tsdx test --notify --verbose",
     "lint": "tsdx lint",
     "prepack": "yarn build",
@@ -65,7 +77,10 @@
     "mongodb": "^3.6.6",
     "publish-please": "^5.5.2",
     "tsdx": "^0.14.1",
-    "typescript": "^4.2.4"
+    "typescript": "^4.2.4",
+    "rollup": "^2.79.0",
+    "rollup-plugin-typescript2": "^0.33.0",
+    "rollup-plugin-dts": "^4.2.2"
   },
   "dependencies": {
     "copy-anything": "^3.0.2"

rollup.config.js

@@ -0,0 +1,105 @@
+'use strict';
+
+var path = require('path');
+var tsc = require('rollup-plugin-typescript2');
+var dts = require('rollup-plugin-dts').default;
+var rollup = require('rollup');
+
+var cwd = path.join(__dirname);
+var shared = {
+    external: /^copy-anything$/,
+    input: {
+        index: path.join(__dirname, 'src', 'index.ts')
+    },
+    plugins: [
+        tsc({
+            cwd: cwd,
+            tsconfig: path.join(cwd, 'tsconfig.json'),
+            check: true,
+            clean: true
+        })
+    ]
+};
+var outDir = path.join(__dirname, 'dist');
+var outDirES2015 = path.join(__dirname, 'dist', 'es2015');
+
+var es5Settings = Object.assign({}, shared, {
+    output: [
+        {
+            dir: outDir,
+            format: 'esm',
+            entryFileNames: '[name].mjs',
+            chunkFileNames: '[name].mjs',
+            hoistTransitiveImports: false,
+            sourcemap: true
+        },
+        {
+            dir: outDir,
+            format: 'cjs',
+            entryFileNames: '[name].cjs',
+            chunkFileNames: '[name].cjs',
+            hoistTransitiveImports: false,
+            sourcemap: true,
+            exports: 'auto'
+        },
+        {
+            dir: outDir,
+            format: 'esm',
+            entryFileNames: '[name].js',
+            chunkFileNames: '[name].js',
+            hoistTransitiveImports: false,
+            sourcemap: true
+        }
+    ]
+});
+
+var es2015Settings = Object.assign({}, shared, {
+    plugins: [
+        tsc({
+            cwd: cwd,
+            tsconfig: path.join(cwd, 'tsconfig.es2015.json'),
+            check: true,
+            clean: true,
+        })
+    ],
+    output: es5Settings.output.map(function mapper(conf) {
+        var shallow = Object.assign({}, conf);
+        shallow.dir = outDirES2015;
+        return shallow;
+    })
+})
+
+module.exports = rollup.defineConfig([
+    es5Settings,
+    es2015Settings,
+    {
+        input: {
+            index: path.join(cwd, 'typings', 'index.d.ts')
+        },
+        plugins: [
+			dts({
+				compilerOptions: {
+					module: 99,
+					moduleResolution: 99,
+					esModuleInterop: true,
+					allowSyntheticDefaultImports: true,
+					lib: ['dom', 'esnext']
+				}
+			})
+		],
+        output: [
+            {
+                dir: outDir,
+                format: 'esm',
+                entryFileNames: '[name].d.ts',
+                chunkFileNames: '[name].d.ts'
+            },
+            {
+                dir: outDirES2015,
+                format: 'esm',
+                entryFileNames: '[name].d.ts',
+                chunkFileNames: '[name].d.ts'
+            },
+        ]
+    }
+]);

tsconfig.d.json

@@ -0,0 +1,22 @@
+{
+  "include": ["src"],
+  "exclude": ["**/*.spec.ts", "**/*.test.ts"],
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "lib": ["esnext"],
+    "importHelpers": false,
+    "declaration": true,
+    "sourceMap": true,
+    "emitDeclarationOnly": true,
+    "declarationDir": "./typings",
+    "moduleResolution": "node",
+    "strict": true,
+    "noUnusedLocals": true,
+    "forceConsistentCasingInFileNames": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "esModuleInterop": true
+  }
+}

tsconfig.es2015.json

@@ -0,0 +1,21 @@
+{
+  "include": ["src"],
+  "exclude": ["**/*.spec.ts", "**/*.test.ts"],
+  "compilerOptions": {
+    "forceConsistentCasingInFileNames": true,
+    "target": "ES2015",
+    "module": "ESNext",
+    "lib": ["esnext"],
+    "importHelpers": false,
+    "declaration": false,
+    "sourceMap": true,
+    "rootDir": "./src",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "moduleResolution": "node",
+    "esModuleInterop": true
+  }
+}

tsconfig.json

@@ -2,13 +2,13 @@
   "include": ["src"],
   "exclude": ["**/*.spec.ts", "**/*.test.ts"],
   "compilerOptions": {
-    "module": "CommonJS",
+    "target": "ES5",
+    "module": "ESNext",
     "lib": ["esnext"],
     "importHelpers": false,
-    "declaration": true,
+    "declaration": false,
     "sourceMap": true,
     "rootDir": "./src",
-    "outDir": "./dist",
     "strict": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,