tools: move eslint from tools to tools/node_modules

This is required because we need to add the babel-eslint dependency
and it has to be able to resolve "eslint".
babel-eslint is required to support future ES features such as async
iterators and import.meta.

Refs: https://github.com/nodejs/node/pull/17755
PR-URL: https://github.com/nodejs/node/pull/17820
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/node_modules/is-alphabetical/index.js b/tools/node_modules/eslint/node_modules/is-alphabetical/index.js
new file mode 100644
index 0000000000..3b27588720
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/is-alphabetical/index.js
@@ -0,0 +1,13 @@
+'use strict';
+
+module.exports = alphabetical;
+
+/* Check if the given character code, or the character
+ * code at the first character, is alphabetical. */
+function alphabetical(character) {
+  var code = typeof character === 'string' ?
+    character.charCodeAt(0) : character;
+
+  return (code >= 97 && code <= 122) || /* a-z */
+    (code >= 65 && code <= 90); /* A-Z */
+}