diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index 0052b8256e..61fd375e6f 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -68,6 +68,14 @@ interface SymbolConstructor {
 }
 declare var Symbol: SymbolConstructor;
 
+// Node.js ESNEXT support
+interface String {
+    /** Removes whitespace from the left end of a string. */
+    trimLeft(): string;
+    /** Removes whitespace from the right end of a string. */
+    trimRight(): string;
+}
+
 /************************************************
 *                                               *
 *                   GLOBAL                      *
diff --git a/types/node/node-tests.ts b/types/node/node-tests.ts
index 41639e52c6..d85a2574db 100644
--- a/types/node/node-tests.ts
+++ b/types/node/node-tests.ts
@@ -3751,3 +3751,13 @@ namespace module_tests {
     const m1: Module = new Module("moduleId");
     const m2: Module = new Module.Module("moduleId");
 }
+
+////////////////////////////////////////////////////
+/// Node.js ESNEXT Support
+////////////////////////////////////////////////////
+
+namespace esnext_string_tests {
+    const s: string = 'foo';
+    const s1: string = s.trimLeft();
+    const s2: string = s.trimRight();
+}