nodejs
diff --git a/‎lib/internal/tty.js‎
Lines changed: 14 additions & 6 deletions b/‎lib/internal/tty.js‎
Lines changed: 14 additions & 6 deletions
@@ -22,6 +22,12 @@
 
 'use strict';
 
+const {
+  RegExpPrototypeTest,
+  StringPrototypeSplit,
+  StringPrototypeToLowerCase,
+} = primordials;
+
 const {
   ERR_INVALID_ARG_TYPE,
   ERR_OUT_OF_RANGE
@@ -134,7 +140,7 @@ function getColorDepth(env = process.env) {
     // Lazy load for startup performance.
     if (OSRelease === undefined) {
       const { release } = require('os');
-      OSRelease = release().split('.');
+      OSRelease = StringPrototypeSplit(release(), '.');
     }
     // Windows 10 build 10586 is the first Windows release that supports 256
     // colors. Windows 10 build 14931 is the first release that supports
@@ -163,14 +169,15 @@ function getColorDepth(env = process.env) {
   }
 
   if ('TEAMCITY_VERSION' in env) {
-    return /^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/.test(env.TEAMCITY_VERSION) ?
+    return RegExpPrototypeTest(/^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/, env.TEAMCITY_VERSION) ?
       COLORS_16 : COLORS_2;
   }
 
   switch (env.TERM_PROGRAM) {
     case 'iTerm.app':
       if (!env.TERM_PROGRAM_VERSION ||
-        /^[0-2]\./.test(env.TERM_PROGRAM_VERSION)) {
+        RegExpPrototypeTest(/^[0-2]\./, env.TERM_PROGRAM_VERSION)
+      ) {
         return COLORS_256;
       }
       return COLORS_16m;
@@ -186,16 +193,17 @@ function getColorDepth(env = process.env) {
   }
 
   if (env.TERM) {
-    if (/^xterm-256/.test(env.TERM))
+    if (RegExpPrototypeTest(/^xterm-256/, env.TERM)) {
       return COLORS_256;
+    }
 
-    const termEnv = env.TERM.toLowerCase();
+    const termEnv = StringPrototypeToLowerCase(env.TERM);
 
     if (TERM_ENVS[termEnv]) {
       return TERM_ENVS[termEnv];
     }
     for (const term of TERM_ENVS_REG_EXP) {
-      if (term.test(termEnv)) {
+      if (RegExpPrototypeTest(term, termEnv)) {
         return COLORS_16;
       }
     }