Do not warn for loose of class features in preset-env

packages/babel-helper-create-class-features-plugin/package.json

@@ -29,6 +29,7 @@
   },
   "devDependencies": {
     "@babel/core": "workspace:*",
-    "@babel/helper-plugin-test-runner": "workspace:*"
+    "@babel/helper-plugin-test-runner": "workspace:*",
+    "@babel/preset-env": "workspace:*"
   }
 }

packages/babel-helper-create-class-features-plugin/src/index.js

@@ -44,7 +44,11 @@ export function createClassFeaturePlugin({
   const constantSuper = api.assumption("constantSuper");
   const noDocumentAll = api.assumption("noDocumentAll");
 
-  if (loose) {
+  if (
+    loose === true ||
+    loose ===
+      "#__internal__@babel/preset-env__prefer-true-but-false-is-ok-if-it-prevents-an-error"
+  ) {
     const explicit = [];
 
     if (setPublicClassFields !== undefined) {

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/no-loose-and-assumptions-preset-env/input.js

@@ -0,0 +1,3 @@
+class A {
+  foo;
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/no-loose-and-assumptions-preset-env/options.json

@@ -0,0 +1,8 @@
+{
+  "validateLogs": true,
+  "presets": [["env", { "shippedProposals": true }]],
+  "assumptions": {
+    "setPublicClassFields": true
+  },
+  "targets": "chrome 70"
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/no-loose-and-assumptions-preset-env/output.js

@@ -0,0 +1,6 @@
+class A {
+  constructor() {
+    this.foo = void 0;
+  }
+
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/no-loose-and-assumptions-preset-env/stderr.txt

@@ -0,0 +1 @@
+

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/warn-loose-and-assumptions-preset-env/input.js

@@ -0,0 +1,3 @@
+class A {
+  foo;
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/warn-loose-and-assumptions-preset-env/options.json

@@ -0,0 +1,8 @@
+{
+  "validateLogs": true,
+  "presets": [["env", { "loose": true, "shippedProposals": true }]],
+  "assumptions": {
+    "setPublicClassFields": true
+  },
+  "targets": "chrome 70"
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/warn-loose-and-assumptions-preset-env/output.js

@@ -0,0 +1,6 @@
+class A {
+  constructor() {
+    this.foo = void 0;
+  }
+
+}

packages/babel-helper-create-class-features-plugin/test/fixtures/plugin-proposal-class-properties/warn-loose-and-assumptions-preset-env/stderr.txt

@@ -0,0 +1,10 @@
+[proposal-class-properties]: You are using the "loose: true" option and you are explicitly setting a value for the "setPublicClassFields" assumption. The "loose" option can cause incompatibilities with the other class features plugins, so it's recommended that you replace it with the following top-level option:
+	"assumptions": {
+		"setPublicClassFields": true,
+		"privateFieldsAsProperties": true
+	}
+[proposal-private-methods]: You are using the "loose: true" option and you are explicitly setting a value for the "setPublicClassFields" assumption. The "loose" option can cause incompatibilities with the other class features plugins, so it's recommended that you replace it with the following top-level option:
+	"assumptions": {
+		"setPublicClassFields": true,
+		"privateFieldsAsProperties": true
+	}

yarn.lock

@@ -429,6 +429,7 @@ __metadata:
     "@babel/helper-plugin-test-runner": "workspace:*"
     "@babel/helper-replace-supers": "workspace:^7.13.0"
     "@babel/helper-split-export-declaration": "workspace:^7.12.13"
+    "@babel/preset-env": "workspace:*"
   peerDependencies:
     "@babel/core": ^7.0.0
   languageName: unknown