chore(build): add CJS, ESM, bundled ESM, and bundled UMD artifacts

feat(tooling): switch from npm to pnpm

chore(tooling): convert config to JSON format

- Build CJS, ESM, bundled ESM and bundled UMD artifacts
- Use pnpm instead of npm
- Convert eslint config to JSON

.eslintrc.json

@@ -0,0 +1,17 @@
+{
+  "env": {
+    "node": true,
+    "es6": true
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "sourceType": "module"
+  },
+  "extends": ["plugin:@typescript-eslint/recommended", "plugin:prettier/recommended"],
+  "plugins": ["prettier"],
+  "root": true,
+  "rules": {
+    "prettier/prettier": "error"
+  }
+}

__tests__/.eslintrc.json

@@ -0,0 +1,23 @@
+{
+  "env": {
+    "es6": true,
+    "node": true,
+    "jest/globals": true
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "sourceType": "module"
+  },
+  "extends": ["plugin:@typescript-eslint/recommended", "plugin:prettier/recommended"],
+  "plugins": ["jest", "prettier"],
+  "rules": {
+    "jest/no-disabled-tests": "off",
+    "jest/no-focused-tests": "error",
+    "jest/no-identical-title": "error",
+    "jest/prefer-to-have-length": "warn",
+    "jest/valid-expect": "error",
+    "prettier/prettier": "error"
+  },
+  "root": true
+}

babel.config.js

@@ -1,3 +1,26 @@
-module.exports = {
-  presets: [['@babel/preset-env', { targets: { node: 'current' } }], '@babel/preset-typescript'],
+export default () => {
+  const sharedPresets = ['@babel/preset-typescript']
+
+  const shared = {
+    ignore: ['./src/cli.ts', './__tests__', './**/*.d.ts'],
+    presets: sharedPresets,
+    sourceMaps: true,
+  }
+
+  return {
+    env: {
+      ESM_UNBUNDLED: shared,
+      ESM_BUNDLED: {
+        ...shared,
+        presets: [['@babel/preset-env', { targets: '> 0.25%, not dead' }], ...sharedPresets],
+      },
+      CJS: {
+        ...shared,
+        presets: [
+          ['@babel/preset-env', { modules: 'commonjs', targets: { node: 'current' } }],
+          ...sharedPresets,
+        ],
+      },
+    },
+  }
 }

examples/browser-multiple/.eslintrc.json

@@ -0,0 +1,11 @@
+{
+  "env": {
+    "browser": true
+  },
+  "globals": {
+    "MediaInfo": "readonly"
+  },
+  "parserOptions": {
+    "sourceType": "script"
+  }
+}

examples/browser-simple/.eslintrc.json

@@ -0,0 +1,11 @@
+{
+  "env": {
+    "browser": true
+  },
+  "globals": {
+    "MediaInfo": "readonly"
+  },
+  "parserOptions": {
+    "sourceType": "script"
+  }
+}