feat: add babel-plugin-transform-not-strict

README.md

@@ -120,6 +120,9 @@ Enable `"@babel/preset-react"`. `true` by default.
 
 Enable `"@babel/preset-flow"`. `true` by default.
 
+8) `removeAllUseStrict`
+
+Remove all `'use strict'` from all files. Passed to `babel-plugin-transform-not-strict`. This is `false` by default.
 
 ## Behind the scenes
 
@@ -141,3 +144,6 @@ It includes the plugins for compile time code generation:
 
 It has the preset that automatically adds default export for older Node versions (so no `require().default` is needed).
 - `"babel-plugin-add-module-exports"`
+
+It has the plugin for removing `'use strict'`:
+- `"babel-plugin-transform-not-strict"`

index.js

@@ -42,12 +42,16 @@ function handleOptions(options) {
     flow = true
   }
 
-  return {targets, keepModules, addModuleExports, addModuleExportsDefaultProperty, sourceMap, react, flow }
+  if (removeAllUseStrict == null) {
+    removeAllUseStrict = false
+  }
+
+  return {targets, keepModules, addModuleExports, addModuleExportsDefaultProperty, sourceMap, react, flow, removeAllUseStrict }
 }
 
 module.exports = (api, options, dirname) => {
 
-  const {targets, keepModules, addModuleExports, addModuleExportsDefaultProperty, sourceMap, react, flow } = handleOptions(options)
+  const {targets, keepModules, addModuleExports, addModuleExportsDefaultProperty, sourceMap, react, flow, removeAllUseStrict } = handleOptions(options)
 
   let presets = [
     [
@@ -94,6 +98,9 @@ module.exports = (api, options, dirname) => {
     // compile time code generation
     require("babel-plugin-codegen"),
     require("babel-plugin-preval"),
+
+    // not strict
+    [require("babel-plugin-transform-not-strict"), {removeAll: removeAllUseStrict}],
   ];
 
   // transform modules (e.g when without Rollup)

package.json

@@ -35,7 +35,8 @@
     "@babel/preset-react": "7.10.4",
     "babel-plugin-add-module-exports": "^1.0.4",
     "babel-plugin-codegen": "^4.0.1",
-    "babel-plugin-preval": "^5.0.0"
+    "babel-plugin-preval": "^5.0.0",
+    "babel-plugin-transform-not-strict": "^0.2.0"
   },
   "peerDependencies": {
     "@babel/cli": "7.11.6",