diff --git a/lib/.eslintrc.yaml b/lib/.eslintrc.yaml
index 02d70f83f9c..0f34afff081 100644
--- a/lib/.eslintrc.yaml
+++ b/lib/.eslintrc.yaml
@@ -49,6 +49,8 @@ rules:
       message: "Use `const { RegExp } = primordials;` instead of the global."
     - name: Set
       message: "Use `const { Set } = primordials;` instead of the global."
+    - name: String
+      message: "Use `const { String } = primordials;` instead of the global."
     - name: Symbol
       message: "Use `const { Symbol } = primordials;` instead of the global."
     - name: Uint16Array
diff --git a/lib/_http_client.js b/lib/_http_client.js
index 30ab9016844..0aae57aed4e 100644
--- a/lib/_http_client.js
+++ b/lib/_http_client.js
@@ -29,6 +29,7 @@ const {
   ObjectAssign,
   ObjectKeys,
   ObjectSetPrototypeOf,
+  String,
   Symbol
 } = primordials;
 
diff --git a/lib/assert.js b/lib/assert.js
index 6ad672d6986..08ef1824092 100644
--- a/lib/assert.js
+++ b/lib/assert.js
@@ -29,6 +29,7 @@ const {
   Map,
   NumberIsNaN,
   RegExpPrototypeTest,
+  String,
 } = primordials;
 
 const { Buffer } = require('buffer');
diff --git a/lib/events.js b/lib/events.js
index c1343acbf31..7d3ee54018d 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -35,6 +35,7 @@ const {
   PromiseResolve,
   ReflectApply,
   ReflectOwnKeys,
+  String,
   Symbol,
   SymbolFor,
   SymbolAsyncIterator
diff --git a/lib/internal/assert/assertion_error.js b/lib/internal/assert/assertion_error.js
index 3c2150c69e4..c89219eef82 100644
--- a/lib/internal/assert/assertion_error.js
+++ b/lib/internal/assert/assertion_error.js
@@ -7,6 +7,7 @@ const {
   ObjectDefineProperty,
   ObjectGetPrototypeOf,
   ObjectKeys,
+  String,
 } = primordials;
 
 const { inspect } = require('internal/util/inspect');
diff --git a/lib/internal/bootstrap/loaders.js b/lib/internal/bootstrap/loaders.js
index c4ef1d12a29..127ef67c36e 100644
--- a/lib/internal/bootstrap/loaders.js
+++ b/lib/internal/bootstrap/loaders.js
@@ -52,6 +52,7 @@ const {
   ObjectPrototypeHasOwnProperty,
   ReflectGet,
   SafeSet,
+  String,
 } = primordials;
 
 // Set up process.moduleLoadList.
diff --git a/lib/internal/errors.js b/lib/internal/errors.js
index ff4cea13b61..314c06c7b78 100644
--- a/lib/internal/errors.js
+++ b/lib/internal/errors.js
@@ -21,6 +21,7 @@ const {
   NumberIsInteger,
   ObjectDefineProperty,
   ObjectKeys,
+  String,
   StringPrototypeStartsWith,
   Symbol,
   SymbolFor,
diff --git a/lib/internal/event_target.js b/lib/internal/event_target.js
index f9dda75f046..4db6af26e39 100644
--- a/lib/internal/event_target.js
+++ b/lib/internal/event_target.js
@@ -9,6 +9,7 @@ const {
   ObjectAssign,
   ObjectDefineProperties,
   ObjectDefineProperty,
+  String,
   Symbol,
   SymbolFor,
   SymbolToStringTag,
diff --git a/lib/internal/http2/util.js b/lib/internal/http2/util.js
index 93994ca29ea..b3fdf420c8c 100644
--- a/lib/internal/http2/util.js
+++ b/lib/internal/http2/util.js
@@ -8,6 +8,8 @@ const {
   ObjectCreate,
   ObjectKeys,
   Set,
+  String,
+  StringFromCharCode,
   StringPrototypeToLowerCase,
   Symbol,
 } = primordials;
@@ -459,8 +461,8 @@ const assertValidPseudoHeaderTrailer = hideStackFrames((key) => {
 });
 
 const emptyArray = [];
-const kNeverIndexFlag = String.fromCharCode(NGHTTP2_NV_FLAG_NO_INDEX);
-const kNoHeaderFlags = String.fromCharCode(NGHTTP2_NV_FLAG_NONE);
+const kNeverIndexFlag = StringFromCharCode(NGHTTP2_NV_FLAG_NO_INDEX);
+const kNoHeaderFlags = StringFromCharCode(NGHTTP2_NV_FLAG_NONE);
 function mapToHeaders(map,
                       assertValuePseudoHeader = assertValidPseudoHeader) {
   let ret = '';
diff --git a/lib/internal/process/warning.js b/lib/internal/process/warning.js
index e2d41eac73b..2822ef22f1f 100644
--- a/lib/internal/process/warning.js
+++ b/lib/internal/process/warning.js
@@ -3,6 +3,7 @@
 const {
   ArrayIsArray,
   Error,
+  String,
 } = primordials;
 
 const assert = require('internal/assert');
diff --git a/lib/internal/readline/utils.js b/lib/internal/readline/utils.js
index d75b64dd46b..408d12d01e1 100644
--- a/lib/internal/readline/utils.js
+++ b/lib/internal/readline/utils.js
@@ -1,6 +1,7 @@
 'use strict';
 
 const {
+  String,
   Symbol,
 } = primordials;
 
diff --git a/lib/internal/url.js b/lib/internal/url.js
index f56e006e90a..3c464ffbd63 100644
--- a/lib/internal/url.js
+++ b/lib/internal/url.js
@@ -11,6 +11,7 @@ const {
   ObjectKeys,
   ReflectGetOwnPropertyDescriptor,
   ReflectOwnKeys,
+  String,
   Symbol,
   SymbolIterator,
   SymbolToStringTag,
diff --git a/lib/internal/util/inspect.js b/lib/internal/util/inspect.js
index a9795390253..2a9bb18fdf6 100644
--- a/lib/internal/util/inspect.js
+++ b/lib/internal/util/inspect.js
@@ -49,6 +49,7 @@ const {
   Set,
   SetPrototype,
   SetPrototypeValues,
+  String,
   StringPrototypeValueOf,
   SymbolPrototypeToString,
   SymbolPrototypeValueOf,
diff --git a/lib/internal/validators.js b/lib/internal/validators.js
index f9509a48827..2ef7d653d98 100644
--- a/lib/internal/validators.js
+++ b/lib/internal/validators.js
@@ -5,6 +5,7 @@ const {
   NumberIsInteger,
   NumberMAX_SAFE_INTEGER,
   NumberMIN_SAFE_INTEGER,
+  String,
 } = primordials;
 
 const {
diff --git a/lib/internal/worker.js b/lib/internal/worker.js
index c04484b3d8d..c89c8cd4e27 100644
--- a/lib/internal/worker.js
+++ b/lib/internal/worker.js
@@ -11,6 +11,7 @@ const {
   ObjectEntries,
   Promise,
   PromiseResolve,
+  String,
   Symbol,
   SymbolFor,
 } = primordials;
diff --git a/lib/querystring.js b/lib/querystring.js
index 4d196633dcf..04a21e8d07f 100644
--- a/lib/querystring.js
+++ b/lib/querystring.js
@@ -29,6 +29,7 @@ const {
   MathAbs,
   ObjectCreate,
   ObjectKeys,
+  String,
 } = primordials;
 
 const { Buffer } = require('buffer');
diff --git a/lib/tls.js b/lib/tls.js
index 2ccbe409c96..a46031ad7da 100644
--- a/lib/tls.js
+++ b/lib/tls.js
@@ -26,6 +26,10 @@ const {
   ArrayIsArray,
   ObjectDefineProperty,
   ObjectFreeze,
+  StringFromCharCode,
+  StringPrototypeCharCodeAt,
+  StringPrototypeReplace,
+  StringPrototypeSplit,
 } = primordials;
 
 const {
@@ -137,11 +141,17 @@ function unfqdn(host) {
   return host.replace(/[.]$/, '');
 }
 
+// String#toLowerCase() is locale-sensitive so we use
+// a conservative version that only lowercases A-Z.
+function toLowerCase(c) {
+  return StringFromCharCode(32 + StringPrototypeCharCodeAt(c, 0));
+}
+
 function splitHost(host) {
-  // String#toLowerCase() is locale-sensitive so we use
-  // a conservative version that only lowercases A-Z.
-  const replacer = (c) => String.fromCharCode(32 + c.charCodeAt(0));
-  return unfqdn(host).replace(/[A-Z]/g, replacer).split('.');
+  return StringPrototypeSplit(
+    StringPrototypeReplace(unfqdn(host), /[A-Z]/g, toLowerCase),
+    '.'
+  );
 }
 
 function check(hostParts, pattern, wildcards) {
diff --git a/lib/wasi.js b/lib/wasi.js
index a764a1745ab..072f19be923 100644
--- a/lib/wasi.js
+++ b/lib/wasi.js
@@ -4,6 +4,7 @@ const {
   ArrayPrototypePush,
   FunctionPrototypeBind,
   ObjectEntries,
+  String,
   Symbol,
 } = primordials;