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, 102 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/node_modules/deep-is/index.js b/tools/node_modules/eslint/node_modules/deep-is/index.js
new file mode 100644
index 0000000000..506fe27953
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/deep-is/index.js
@@ -0,0 +1,102 @@
+var pSlice = Array.prototype.slice;
+var Object_keys = typeof Object.keys === 'function'
+    ? Object.keys
+    : function (obj) {
+        var keys = [];
+        for (var key in obj) keys.push(key);
+        return keys;
+    }
+;
+
+var deepEqual = module.exports = function (actual, expected) {
+  // enforce Object.is +0 !== -0
+  if (actual === 0 && expected === 0) {
+    return areZerosEqual(actual, expected);
+
+  // 7.1. All identical values are equivalent, as determined by ===.
+  } else if (actual === expected) {
+    return true;
+
+  } else if (actual instanceof Date && expected instanceof Date) {
+    return actual.getTime() === expected.getTime();
+
+  } else if (isNumberNaN(actual)) {
+    return isNumberNaN(expected);
+
+  // 7.3. Other pairs that do not both pass typeof value == 'object',
+  // equivalence is determined by ==.
+  } else if (typeof actual != 'object' && typeof expected != 'object') {
+    return actual == expected;
+
+  // 7.4. For all other Object pairs, including Array objects, equivalence is
+  // determined by having the same number of owned properties (as verified
+  // with Object.prototype.hasOwnProperty.call), the same set of keys
+  // (although not necessarily the same order), equivalent values for every
+  // corresponding key, and an identical 'prototype' property. Note: this
+  // accounts for both named and indexed properties on Arrays.
+  } else {
+    return objEquiv(actual, expected);
+  }
+};
+
+function isUndefinedOrNull(value) {
+  return value === null || value === undefined;
+}
+
+function isArguments(object) {
+  return Object.prototype.toString.call(object) == '[object Arguments]';
+}
+
+function isNumberNaN(value) {
+  // NaN === NaN -> false
+  return typeof value == 'number' && value !== value;
+}
+
+function areZerosEqual(zeroA, zeroB) {
+  // (1 / +0|0) -> Infinity, but (1 / -0) -> -Infinity and (Infinity !== -Infinity)
+  return (1 / zeroA) === (1 / zeroB);
+}
+
+function objEquiv(a, b) {
+  if (isUndefinedOrNull(a) || isUndefinedOrNull(b))
+    return false;
+
+  // an identical 'prototype' property.
+  if (a.prototype !== b.prototype) return false;
+  //~~~I've managed to break Object.keys through screwy arguments passing.
+  //   Converting to array solves the problem.
+  if (isArguments(a)) {
+    if (!isArguments(b)) {
+      return false;
+    }
+    a = pSlice.call(a);
+    b = pSlice.call(b);
+    return deepEqual(a, b);
+  }
+  try {
+    var ka = Object_keys(a),
+        kb = Object_keys(b),
+        key, i;
+  } catch (e) {//happens when one is a string literal and the other isn't
+    return false;
+  }
+  // having the same number of owned properties (keys incorporates
+  // hasOwnProperty)
+  if (ka.length != kb.length)
+    return false;
+  //the same set of keys (although not necessarily the same order),
+  ka.sort();
+  kb.sort();
+  //~~~cheap key test
+  for (i = ka.length - 1; i >= 0; i--) {
+    if (ka[i] != kb[i])
+      return false;
+  }
+  //equivalent values for every corresponding key, and
+  //~~~possibly expensive deep test
+  for (i = ka.length - 1; i >= 0; i--) {
+    key = ka[i];
+    if (!deepEqual(a[key], b[key])) return false;
+  }
+  return true;
+}