add some packages

node_modules/babel-plugin-minify-dead-code-elimination/README.md

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+# babel-plugin-minify-dead-code-elimination
+
+Inlines bindings when possible. Tries to evaluate expressions and prunes unreachable as a result.
+
+## Example
+
+**In**
+
+```javascript
+function foo() {var x = 1;}
+function bar() { var x = f(); }
+function baz() {
+  var x = 1;
+  console.log(x);
+  function unused() {
+    return 5;
+  }
+}
+```
+
+**Out**
+
+```javascript
+function foo() {}
+function bar() { f(); }
+function baz() {
+  console.log(1);
+}
+```
+
+## Installation
+
+```sh
+npm install babel-plugin-minify-dead-code-elimination
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+// without options
+{
+  "plugins": ["minify-dead-code-elimination"]
+}
+
+// with options
+{
+  "plugins": ["minify-dead-code-elimination", { "optimizeRawSize": true }]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins minify-dead-code-elimination script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["minify-dead-code-elimination"]
+});
+```
+
+## Options
+
++ `keepFnName` - prevent plugin from removing function name. Useful for code depending on `fn.name`
++ `keepFnArgs` - prevent plugin from removing function args. Useful for code depending on `fn.length`
++ `keepClassName` - prevent plugin from removing class name. Useful for code depending on `cls.name`
++ `tdz` - Account for TDZ (Temporal Dead Zone)