Import babel-plugin-transform-dotall-regex (#7059)

Original: https://github.com/mathiasbynens/babel-plugin-transform-dotall-regex

Moving it into the official Babel repository makes it easier to maintain the transform.

packages/babel-plugin-transform-dotall-regex/README.md

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+# @babel/plugin-transform-dotall-regex
+
+> Compile regular expressions using [the `s` (`dotAll`) flag](https://github.com/tc39/proposal-regexp-dotall-flag) to ES5 that works in today’s environments.
+
+## Example
+
+**In**
+
+```js
+/./s
+```
+
+**Out**
+
+```js
+/[\0-\uFFFF]/
+```
+
+**In**
+
+```js
+/./su
+```
+
+**Out**
+
+```js
+/[\0-\u{10FFFF}]/u
+```
+
+[Here’s an online demo.](https://mothereff.in/regexpu#input=const+regex+%3D+/foo.bar/s%3B%0Aconsole.log%28%0A++regex.test%28%27foo%5Cnbar%27%29%0A%29%3B%0A//+%E2%86%92+true&dotAllFlag=1)
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-transform-dotall-regex
+```
+
+## Usage
+
+### Via `.babelrc` (recommended)
+
+`.babelrc`
+
+```json
+{
+  "plugins": ["@babel/plugin-transform-dotall-regex"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins @babel/plugin-transform-dotall-regex script.js
+```
+
+### Via Node.js API
+
+```js
+require('@babel/core').transform(code, {
+  'plugins': ['@babel/plugin-transform-dotall-regex']
+});
+```
+
+## Author
+
+| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |
+|---|
+| [Mathias Bynens](https://mathiasbynens.be/) |

packages/babel-plugin-transform-dotall-regex/package.json

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+{
+  "name": "@babel/plugin-transform-dotall-regex",
+  "version": "7.0.0-beta.35",
+  "description": "Compile regular expressions using the `s` (`dotAll`) flag to ES5.",
+  "homepage": "https://babeljs.io/",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "engines": {
+    "node": ">=4"
+  },
+  "keywords": [
+    "babel-plugin",
+    "regex",
+    "regexp",
+    "regular expressions",
+    "dotall"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-dotall-regex.git"
+  },
+  "bugs": "https://github.com/babel/babel/issues",
+  "dependencies": {
+    "@babel/helper-regex": "7.0.0-beta.35",
+    "regexpu-core": "^4.1.3"
+  },
+  "peerDependencies": {
+    "@babel/core": "7.0.0-beta.35"
+  },
+  "devDependencies": {
+    "@babel/core": "7.0.0-beta.35",
+    "@babel/helper-plugin-test-runner": "7.0.0-beta.35"
+  }
+}

packages/babel-plugin-transform-dotall-regex/src/index.js

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+import rewritePattern from "regexpu-core";
+import * as regex from "@babel/helper-regex";
+
+export default function() {
+  return {
+    visitor: {
+      RegExpLiteral(path) {
+        const node = path.node;
+        if (!regex.is(node, "s")) {
+          return;
+        }
+        node.pattern = rewritePattern(node.pattern, node.flags, {
+          dotAllFlag: true,
+          useUnicodeFlag: regex.is(node, "u"),
+        });
+        regex.pullFlag(node, "s");
+      },
+    },
+  };
+}

packages/babel-plugin-transform-dotall-regex/test/fixtures/dotall-regex/options.json

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+{
+  "plugins": ["transform-dotall-regex"]
+}

packages/babel-plugin-transform-dotall-regex/test/fixtures/dotall-regex/simple/actual.js

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+var a = /./;
+var b = /./s;

packages/babel-plugin-transform-dotall-regex/test/fixtures/dotall-regex/simple/expected.js

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+var a = /./;
+var b = /[\0-\uFFFF]/;

packages/babel-plugin-transform-dotall-regex/test/fixtures/dotall-regex/with-unicode-flag/actual.js

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+var a = /./u;
+var b = /./su;

packages/babel-plugin-transform-dotall-regex/test/fixtures/dotall-regex/with-unicode-flag/expected.js

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+var a = /./u;
+var b = /[\0-\u{10FFFF}]/u;

packages/babel-plugin-transform-dotall-regex/test/index.js

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+import runner from "@babel/helper-plugin-test-runner";
+runner(__dirname);