Transform ES2015 Unicode Escapes to ES5

packages/babel-compat-data/data/plugins.json

@@ -87,6 +87,7 @@
     "chrome": "62",
     "opera": "49",
     "edge": "79",
+    "firefox": "78",
     "safari": "11.1",
     "node": "8.10",
     "ios": "11.3",
@@ -97,6 +98,7 @@
     "chrome": "64",
     "opera": "51",
     "edge": "79",
+    "firefox": "78",
     "safari": "11.1",
     "node": "10",
     "ios": "11.3",
@@ -268,6 +270,17 @@
     "samsung": "5",
     "electron": "0.37"
   },
+  "transform-unicode-escapes": {
+    "chrome": "44",
+    "opera": "31",
+    "edge": "12",
+    "firefox": "53",
+    "safari": "9",
+    "node": "4",
+    "ios": "9",
+    "samsung": "4",
+    "electron": "0.30"
+  },
   "transform-unicode-regex": {
     "chrome": "50",
     "opera": "37",

packages/babel-compat-data/scripts/data/plugin-features.js

@@ -62,6 +62,7 @@ const es2015 = {
       'RegExp "y" and "u" flags / "y" flag',
     ],
   },
+  "transform-unicode-escapes": "Unicode code point escapes",
   "transform-unicode-regex": {
     features: [
       'RegExp "y" and "u" flags / "u" flag, case folding',

packages/babel-compat-data/scripts/download-compat-table.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 
-COMPAT_TABLE_COMMIT=9e07df3875d8416af85cf523716519e9dd1e5e44
+COMPAT_TABLE_COMMIT=50e5424d113869b08911a5df956d0e931722e5b5
 GIT_HEAD=build/compat-table/.git/HEAD
 
 if [ -d "build/compat-table" ]; then

packages/babel-plugin-transform-template-literals/test/fixtures/default/tag-with-unicode-escapes/input.js

@@ -0,0 +1 @@
+var foo = bar`\u0061\u{0061}\ud835\udc9c\u{1d49c}`;

packages/babel-plugin-transform-template-literals/test/fixtures/default/tag-with-unicode-escapes/output.js

@@ -0,0 +1,13 @@
+function _templateObject() {
+  const data = _taggedTemplateLiteral(["aa\uD835\uDC9C\uD835\uDC9C"], ["\\u0061\\u{0061}\\ud835\\udc9c\\u{1d49c}"]);
+
+  _templateObject = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _taggedTemplateLiteral(strings, raw) { if (!raw) { raw = strings.slice(0); } return Object.freeze(Object.defineProperties(strings, { raw: { value: Object.freeze(raw) } })); }
+
+var foo = bar(_templateObject());

packages/babel-plugin-transform-unicode-escapes/.npmignore

@@ -0,0 +1,3 @@
+src
+test
+*.log

packages/babel-plugin-transform-unicode-escapes/README.md

@@ -0,0 +1,19 @@
+# @babel/plugin-transform-unicode-escapes
+
+> Compile ES2015 Unicode escapes to ES5
+
+See our website [@babel/plugin-transform-unicode-escapes](https://babeljs.io/docs/en/next/babel-plugin-transform-unicode-escapes.html) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/plugin-transform-unicode-escapes
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/plugin-transform-unicode-escapes --dev
+```

packages/babel-plugin-transform-unicode-escapes/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "@babel/plugin-transform-unicode-escapes",
+  "version": "7.8.3",
+  "description": "Compile ES2015 Unicode escapes to ES5",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-unicode-escapes",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "^7.8.3"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.8.3",
+    "@babel/helper-plugin-test-runner": "^7.8.3"
+  }
+}

packages/babel-plugin-transform-unicode-escapes/src/index.js

@@ -0,0 +1,107 @@
+import { declare } from "@babel/helper-plugin-utils";
+import { types as t } from "@babel/core";
+
+export default declare(api => {
+  api.assertVersion(7);
+
+  const surrogate = /[\ud800-\udfff]/g;
+  const unicodeEscape = /(\\+)u\{([0-9a-fA-F]+)\}/g;
+
+  function escape(code) {
+    let str = code.toString(16);
+    // Sigh, node 6 doesn't have padStart
+    // TODO: Remove in Babel 8, when we drop node 6.
+    while (str.length < 4) str = "0" + str;
+    return "\\u" + str;
+  }
+
+  function replacer(match, backslashes, code) {
+    if (backslashes.length % 2 === 0) {
+      return match;
+    }
+
+    const char = String.fromCodePoint(parseInt(code, 16));
+    const escaped = backslashes.slice(0, -1) + escape(char.charCodeAt(0));
+
+    return char.length === 1 ? escaped : escaped + escape(char.charCodeAt(1));
+  }
+
+  function replaceUnicodeEscapes(str) {
+    return str.replace(unicodeEscape, replacer);
+  }
+
+  function getUnicodeEscape(str) {
+    let match;
+    while ((match = unicodeEscape.exec(str))) {
+      if (match[1].length % 2 === 0) continue;
+      unicodeEscape.lastIndex = 0;
+      return match[0];
+    }
+    return null;
+  }
+
+  return {
+    name: "transform-unicode-escapes",
+    visitor: {
+      Identifier(path) {
+        const { node, key } = path;
+        const { name } = node;
+        const replaced = name.replace(surrogate, c => {
+          return `_u${c.charCodeAt(0).toString(16)}`;
+        });
+        if (name === replaced) return;
+
+        const str = t.inherits(t.stringLiteral(name), node);
+
+        if (key === "key") {
+          path.replaceWith(str);
+          return;
+        }
+
+        const { parentPath, scope } = path;
+        if (
+          parentPath.isMemberExpression({ property: node }) ||
+          parentPath.isOptionalMemberExpression({ property: node })
+        ) {
+          parentPath.node.computed = true;
+          path.replaceWith(str);
+          return;
+        }
+
+        const binding = scope.getBinding(name);
+        if (binding) {
+          scope.rename(name, scope.generateUid(replaced));
+          return;
+        }
+
+        throw path.buildCodeFrameError(
+          `Can't reference '${name}' as a bare identifier`,
+        );
+      },
+
+      "StringLiteral|DirectiveLiteral"(path) {
+        const { node } = path;
+        const { extra } = node;
+
+        if (extra?.raw) extra.raw = replaceUnicodeEscapes(extra.raw);
+      },
+
+      TemplateElement(path) {
+        const { node, parentPath } = path;
+        const { value } = node;
+
+        const firstEscape = getUnicodeEscape(value.raw);
+        if (!firstEscape) return;
+
+        const grandParent = parentPath.parentPath;
+        if (grandParent.isTaggedTemplateExpression()) {
+          throw path.buildCodeFrameError(
+            `Can't replace Unicode escape '${firstEscape}' inside tagged template literals. You can enable '@babel/plugin-transform-template-literals' to compile them to classic strings.`,
+          );
+        }
+
+        value.raw = replaceUnicodeEscapes(value.raw);
+      },
+    },
+  };
+});

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/directive/input.js

@@ -0,0 +1 @@
+"𝒜\ud835\udc9c\u{1d49c}"

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/directive/output.js

@@ -0,0 +1 @@
+"𝒜\ud835\udc9c\ud835\udc9c";

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-bare-identifier-global/input.js

@@ -0,0 +1 @@
+\u{1d49c};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-bare-identifier-global/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Can't reference '𝒜' as a bare identifier"
+}

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-bare-identifier/input.js

@@ -0,0 +1,2 @@
+var \u{1d49c} = 1;
+\u{1d49c};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-bare-identifier/output.js

@@ -0,0 +1,2 @@
+var _ud835_udc9c = 1;
+_ud835_udc9c;

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-class-accessor-key/input.js

@@ -0,0 +1 @@
+var o = class { get \u{1d49c}() {} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-class-accessor-key/output.js

@@ -0,0 +1,4 @@
+var o = class {
+  get "\uD835\uDC9C"() {}
+
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-class-field-key/input.js

@@ -0,0 +1 @@
+var o = class { \u{1d49c} =  1 };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-class-field-key/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-unicode-escapes", "syntax-class-properties"]
+}

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-class-field-key/output.js

@@ -0,0 +1,3 @@
+var o = class {
+  "\uD835\uDC9C" = 1;
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-class-method-key/input.js

@@ -0,0 +1 @@
+var o = class { \u{1d49c}() {} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-class-method-key/output.js

@@ -0,0 +1,4 @@
+var o = class {
+  "\uD835\uDC9C"() {}
+
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-member-property/input.js

@@ -0,0 +1 @@
+obj.\u{1d49c};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-member-property/output.js

@@ -0,0 +1 @@
+obj["\uD835\uDC9C"];

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-accessor-key/input.js

@@ -0,0 +1 @@
+var o = { get \u{1d49c}() {} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-accessor-key/output.js

@@ -0,0 +1,4 @@
+var o = {
+  get "\uD835\uDC9C"() {}
+
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-method-key/input.js

@@ -0,0 +1 @@
+var o = { \u{1d49c}() {} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-method-key/output.js

@@ -0,0 +1,4 @@
+var o = {
+  "\uD835\uDC9C"() {}
+
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-property-key/input.js

@@ -0,0 +1 @@
+var o = { \u{1d49c}: 1 };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-property-key/output.js

@@ -0,0 +1,3 @@
+var o = {
+  "\uD835\uDC9C": 1
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-property-shorthand-global/input.js

@@ -0,0 +1 @@
+var o = { \u{1d49c} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-property-shorthand-global/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Can't reference '𝒜' as a bare identifier"
+}

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-property-shorthand/input.js

@@ -0,0 +1,2 @@
+var \u{1d49c} = 1;
+var o = { \u{1d49c} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-object-property-shorthand/output.js

@@ -0,0 +1,4 @@
+var _ud835_udc9c = 1;
+var o = {
+  "\uD835\uDC9C": _ud835_udc9c
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-optional-member-property/input.js

@@ -0,0 +1 @@
+obj?.\u{1d49c};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/escaped-optional-member-property/output.js

@@ -0,0 +1 @@
+obj?.["\uD835\uDC9C"];

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-unicode-escapes"]
+}

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-bare-identifier-global/input.js

@@ -0,0 +1 @@
+𝒜;

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-bare-identifier-global/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Can't reference '𝒜' as a bare identifier"
+}

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-bare-identifier/input.js

@@ -0,0 +1,2 @@
+var 𝒜 = 1;
+𝒜;

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-bare-identifier/output.js

@@ -0,0 +1,2 @@
+var _ud835_udc9c = 1;
+_ud835_udc9c;

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-class-accessor-key/input.js

@@ -0,0 +1 @@
+var o = class { get 𝒜 () {} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-class-accessor-key/output.js

@@ -0,0 +1,4 @@
+var o = class {
+  get "\uD835\uDC9C"() {}
+
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-class-field-key/input.js

@@ -0,0 +1 @@
+var o = class { 𝒜  = 1 };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-class-field-key/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-unicode-escapes", "syntax-class-properties"]
+}

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-class-field-key/output.js

@@ -0,0 +1,3 @@
+var o = class {
+  "\uD835\uDC9C" = 1;
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-class-method-key/input.js

@@ -0,0 +1 @@
+var o = class { 𝒜 () {} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-class-method-key/output.js

@@ -0,0 +1,4 @@
+var o = class {
+  "\uD835\uDC9C"() {}
+
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-member-property/input.js

@@ -0,0 +1 @@
+obj.𝒜 ;

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-member-property/output.js

@@ -0,0 +1 @@
+obj["\uD835\uDC9C"];

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-accessor-key/input.js

@@ -0,0 +1 @@
+var o = { get 𝒜 () {} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-accessor-key/output.js

@@ -0,0 +1,4 @@
+var o = {
+  get "\uD835\uDC9C"() {}
+
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-method-key/input.js

@@ -0,0 +1 @@
+var o = { 𝒜 () {} };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-method-key/output.js

@@ -0,0 +1,4 @@
+var o = {
+  "\uD835\uDC9C"() {}
+
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-property-key/input.js

@@ -0,0 +1 @@
+var o = { 𝒜 : 1 };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-property-key/output.js

@@ -0,0 +1,3 @@
+var o = {
+  "\uD835\uDC9C": 1
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-property-shorthand-global/input.js

@@ -0,0 +1 @@
+var o = { 𝒜  };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-property-shorthand-global/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Can't reference '𝒜' as a bare identifier"
+}

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-property-shorthand/input.js

@@ -0,0 +1,2 @@
+var 𝒜 = 1;
+var o = { 𝒜  };

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-object-property-shorthand/output.js

@@ -0,0 +1,4 @@
+var _ud835_udc9c = 1;
+var o = {
+  "\uD835\uDC9C": _ud835_udc9c
+};

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-optional-member-property/input.js

@@ -0,0 +1 @@
+obj?.𝒜 ;

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/raw-optional-member-property/output.js

@@ -0,0 +1 @@
+obj?.["\uD835\uDC9C"];

packages/babel-plugin-transform-unicode-escapes/test/fixtures/unicode-escapes/string/input.js

@@ -0,0 +1,7 @@
+0;
+"𝒜\ud835\udc9c\u{1d49c}";
+"\u{1d49c}";
+"\\u{1d49c}";
+"\\\u{1d49c}";
+"\\\\u{1d49c}";
+