Fix tests on windows

packages/babel-core/test/api.js

@@ -813,7 +813,7 @@ describe("api", function () {
               "'plugins' section of your Babel config to enable transformation.",
           );
           expect(err.message).toMatch(
-            /You can re-run Babel with the BABEL_SHOW_CONFIG_FOR=(.*?)\/parsing-errors\/syntax-and-transform\/file.js environment variable to show the loaded configuration./,
+            /You can re-run Babel with the BABEL_SHOW_CONFIG_FOR=(.*?)[\\/]parsing-errors[\\/]syntax-and-transform[\\/]file.js environment variable to show the loaded configuration./,
           );
           done();
         },

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/methods-loose-preset-not-loose-win/input.js

@@ -0,0 +1,5 @@
+class A {
+  x = 2;
+
+  #foo() {}
+}

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/methods-loose-preset-not-loose-win/options.json

@@ -0,0 +1,13 @@
+{
+  "os": ["win32"],
+  "validateLogs": true,
+  "presets": [
+    ["env", {
+      "targets": { "node": 10 },
+      "shippedProposals": true
+    }]
+  ],
+  "plugins": [
+    ["proposal-private-methods", { "loose": true }]
+  ]
+}

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/methods-loose-preset-not-loose-win/output.js

@@ -0,0 +1,17 @@
+var id = 0;
+
+function _classPrivateFieldLooseKey(name) { return "__private_" + id++ + "_" + name; }
+
+var _foo = _classPrivateFieldLooseKey("foo");
+
+class A {
+  constructor() {
+    Object.defineProperty(this, _foo, {
+      value: _foo2
+    });
+    this.x = 2;
+  }
+
+}
+
+var _foo2 = function _foo2() {};

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/methods-loose-preset-not-loose-win/stderr.txt

@@ -0,0 +1,5 @@
+Though the "loose" option was set to "false" in your @babel/preset-env config, it will not be used for @babel/plugin-proposal-class-properties since the "loose" mode option was set to "true" for @babel/plugin-proposal-private-methods.
+The "loose" option must be the same for @babel/plugin-proposal-class-properties, @babel/plugin-proposal-private-methods and @babel/plugin-proposal-private-property-in-object (when they are enabled): you can silence this warning by explicitly adding
+	["@babel/plugin-proposal-class-properties", { "loose": true }]
+to the "plugins" section of your Babel config.
+You can re-run Babel with the BABEL_SHOW_CONFIG_FOR=<CWD>\packages\babel-preset-env\test\fixtures\loose-class-features-precedence\methods-loose-preset-not-loose\input.js environment variable to show the loaded configuration.

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/methods-loose-preset-not-loose/options.json

@@ -1,4 +1,5 @@
 {
+  "os": ["darwin", "linux"],
   "validateLogs": true,
   "presets": [
     ["env", {

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-loose-preset-not-loose-win/input.js

@@ -0,0 +1,5 @@
+class A {
+  x = 2;
+
+  #foo() {}
+}

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-loose-preset-not-loose-win/options.json

@@ -0,0 +1,13 @@
+{
+  "os": ["win32"],
+  "validateLogs": true,
+  "presets": [
+    ["env", {
+      "targets": { "node": 10 },
+      "shippedProposals": true
+    }]
+  ],
+  "plugins": [
+    ["proposal-class-properties", { "loose": true }]
+  ]
+}

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-loose-preset-not-loose-win/output.js

@@ -0,0 +1,17 @@
+var id = 0;
+
+function _classPrivateFieldLooseKey(name) { return "__private_" + id++ + "_" + name; }
+
+var _foo = _classPrivateFieldLooseKey("foo");
+
+class A {
+  constructor() {
+    Object.defineProperty(this, _foo, {
+      value: _foo2
+    });
+    this.x = 2;
+  }
+
+}
+
+var _foo2 = function _foo2() {};

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-loose-preset-not-loose-win/stderr.txt

@@ -0,0 +1,5 @@
+Though the "loose" option was set to "false" in your @babel/preset-env config, it will not be used for @babel/plugin-proposal-private-methods since the "loose" mode option was set to "true" for @babel/plugin-proposal-class-properties.
+The "loose" option must be the same for @babel/plugin-proposal-class-properties, @babel/plugin-proposal-private-methods and @babel/plugin-proposal-private-property-in-object (when they are enabled): you can silence this warning by explicitly adding
+	["@babel/plugin-proposal-private-methods", { "loose": true }]
+to the "plugins" section of your Babel config.
+You can re-run Babel with the BABEL_SHOW_CONFIG_FOR=<CWD>\packages\babel-preset-env\test\fixtures\loose-class-features-precedence\properties-loose-preset-not-loose\input.js environment variable to show the loaded configuration.

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-loose-preset-not-loose/options.json

@@ -1,4 +1,5 @@
 {
+  "os": ["darwin", "linux"],
   "validateLogs": true,
   "presets": [
     ["env", {

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-not-loose-preset-loose-win/input.js

@@ -0,0 +1,5 @@
+class A {
+  x = 2;
+
+  #foo() {}
+}

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-not-loose-preset-loose-win/options.json

@@ -0,0 +1,14 @@
+{
+  "os": ["win32"],
+  "validateLogs": true,
+  "presets": [
+    ["env", {
+      "targets": { "node": 10 },
+      "shippedProposals": true,
+      "loose": true
+    }]
+  ],
+  "plugins": [
+    ["proposal-class-properties", { "loose": false }]
+  ]
+}

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-not-loose-preset-loose-win/output.js

@@ -0,0 +1,14 @@
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+var _foo = new WeakSet();
+
+class A {
+  constructor() {
+    _foo.add(this);
+
+    _defineProperty(this, "x", 2);
+  }
+
+}
+
+var _foo2 = function _foo2() {};

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-not-loose-preset-loose-win/stderr.txt

@@ -0,0 +1,5 @@
+Though the "loose" option was set to "true" in your @babel/preset-env config, it will not be used for @babel/plugin-proposal-private-methods since the "loose" mode option was set to "false" for @babel/plugin-proposal-class-properties.
+The "loose" option must be the same for @babel/plugin-proposal-class-properties, @babel/plugin-proposal-private-methods and @babel/plugin-proposal-private-property-in-object (when they are enabled): you can silence this warning by explicitly adding
+	["@babel/plugin-proposal-private-methods", { "loose": false }]
+to the "plugins" section of your Babel config.
+You can re-run Babel with the BABEL_SHOW_CONFIG_FOR=<CWD>\packages\babel-preset-env\test\fixtures\loose-class-features-precedence\properties-not-loose-preset-loose\input.js environment variable to show the loaded configuration.

packages/babel-preset-env/test/fixtures/loose-class-features-precedence/properties-not-loose-preset-loose/options.json

@@ -1,4 +1,5 @@
 {
+  "os": ["darwin", "linux"],
   "validateLogs": true,
   "presets": [
     ["env", {