tools: add BigInt to globals

PR-URL: #21237
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

.eslintrc.js

@@ -243,6 +243,7 @@ module.exports = {
     'node-core/no-unescaped-regexp-dot': 'error',
   },
   globals: {
+    BigInt: false,
     COUNTER_HTTP_CLIENT_REQUEST: false,
     COUNTER_HTTP_CLIENT_RESPONSE: false,
     COUNTER_HTTP_SERVER_REQUEST: false,

lib/internal/fs/utils.js

@@ -160,7 +160,6 @@ Stats.prototype._checkModeProperty = function(property) {
     return false;  // Some types are not available on Windows
   }
   if (typeof this.mode === 'bigint') {  // eslint-disable-line valid-typeof
-    // eslint-disable-next-line no-undef
     return (this.mode & BigInt(S_IFMT)) === BigInt(property);
   }
   return (this.mode & S_IFMT) === property;

test/parallel/test-fs-stat-bigint.js

@@ -31,7 +31,6 @@ function verifyStats(bigintStats, numStats) {
         `difference of ${key}.getTime() should < 2.\n` +
         `Number version ${time}, BigInt version ${time2}n`);
     } else if (key === 'mode') {
-      // eslint-disable-next-line no-undef
       assert.strictEqual(bigintStats[key], BigInt(val));
       assert.strictEqual(
         bigintStats.isBlockDevice(),
@@ -65,7 +64,6 @@ function verifyStats(bigintStats, numStats) {
       assert.strictEqual(bigintStats[key], undefined);
       assert.strictEqual(numStats[key], undefined);
     } else if (Number.isSafeInteger(val)) {
-      // eslint-disable-next-line no-undef
       assert.strictEqual(bigintStats[key], BigInt(val));
     } else {
       assert(