Don't use require() in ESM files (#12728)

* Update `yarn-plugin-conditions`

* Don't use `require()` in ESM files

packages/babel-core/src/config/helpers/escape-regexp.cjs

@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = process.env.BABEL_8_BREAKING
+  ? require("escape-string-regexp")
+  : require("lodash/escapeRegExp");

packages/babel-core/src/config/pattern-to-regex.js

@@ -1,9 +1,8 @@
 // @flow
 import path from "path";
 
-const escapeRegExp = process.env.BABEL_8_BREAKING
-  ? require("escape-string-regexp")
-  : require("lodash/escapeRegExp");
+// $FlowIgnore
+import escapeRegExp from "./helpers/escape-regexp";
 
 const sep = `\\${path.sep}`;
 const endSep = `(?:${sep}|$)`;
@@ -42,13 +41,11 @@ export default function pathToPattern(
         // *.ext matches a wildcard with an extension.
         if (part.indexOf("*.") === 0) {
           return (
-            // $FlowIgnore
             substitution + escapeRegExp(part.slice(1)) + (last ? endSep : sep)
           );
         }
 
         // Otherwise match the pattern text.
-        // $FlowIgnore
         return escapeRegExp(part) + (last ? endSep : sep);
       }),
     ].join(""),

packages/babel-helper-transform-fixture-test-runner/src/escape-regexp.cjs

@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = process.env.BABEL_8_BREAKING
+  ? require("escape-string-regexp")
+  : require("lodash/escapeRegExp");

packages/babel-helper-transform-fixture-test-runner/src/index.js

@@ -16,11 +16,7 @@ import vm from "vm";
 import checkDuplicatedNodes from "babel-check-duplicated-nodes";
 import QuickLRU from "quick-lru";
 import diff from "jest-diff";
-
-// $FlowIgnore
-const escapeRegExp = process.env.BABEL_8_BREAKING
-  ? require("escape-string-regexp")
-  : require("lodash/escapeRegExp");
+import escapeRegExp from "./escape-regexp";
 
 const cachedScripts = new QuickLRU({ maxSize: 10 });
 const contextModuleCache = new WeakMap();

packages/babel-register/src/escape-regexp.cjs

@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = process.env.BABEL_8_BREAKING
+  ? require("escape-string-regexp")
+  : require("lodash/escapeRegExp");

packages/babel-register/src/node.js

@@ -7,11 +7,7 @@ import { addHook } from "pirates";
 import fs from "fs";
 import path from "path";
 import Module from "module";
-
-// $FlowIgnore
-const escapeRegExp = process.env.BABEL_8_BREAKING
-  ? require("escape-string-regexp")
-  : require("lodash/escapeRegExp");
+import escapeRegExp from "./escape-regexp";
 
 const maps = {};
 let transformOpts = {};