Index: userdiff.c
diff --git a/userdiff.c b/userdiff.c
--- a/userdiff.c	(revision 2953d95d402b6bff1a59c4712f4d46f1b9ea137f)
+++ b/userdiff.c	(revision 6724df99624834d9b7278a0bc95fa319f526a1fe)
@@ -297,6 +297,22 @@
 	 "|([^][)(}{[ \t])+"),
 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 	 "\\\\[a-zA-Z@]+|\\\\.|([a-zA-Z0-9]|[^\x01-\x7f])+"),
+PATTERNS("typescript",
+         "^[ \t]*((enum|interface|type)[ \t]+([a-zA-Z][a-zA-Z0-9]*)+.*)$\n"
+         /* Method definitions */
+         "^[ \t]*[a-z]+[ \t]+([A-Za-z_][A-Za-z_0-9]*)+([ \t]*=[ \t]*(function)?)?([ \t]*[A-Za-z_<>&][?&<>|.,A-Za-z_]*[ \t]*)*[ \t]*\\([^;]*$",
+         /* -- */
+         "[a-zA-Z_][a-zA-Z0-9_]*"
+         /* Integers and floats */
+         "|[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?"
+         /* Binary */
+         "|0[bB][01]+"
+         /* Hexadecimals */
+         "|0[xX][0-9a-fA-F]+"
+         /* Floats starting with a decimal point */
+         "|[-+]?([0-9]*\\.?[0-9]+|[0-9]+\\.?[0-9]*)([eE][-+]?[0-9]+)?"
+         /* Operators */
+         "[-+*/%&|^!=<>]=?|===|!==|<<=?|>>=?|&&|\\|\\||\\?\\?|\\+\\+|--|~"),
 { "default", NULL, NULL, -1, { NULL, 0 } },
 };
 #undef PATTERNS
Index: t/t4018/typescript-arrow-function
diff --git a/t/t4018/typescript-arrow-function b/t/t4018/typescript-arrow-function
new file mode 100644
--- /dev/null	(revision b60d253ea78063d444f7131c3100388a7cdac060)
+++ b/t/t4018/typescript-arrow-function	(revision b60d253ea78063d444f7131c3100388a7cdac060)
@@ -0,0 +1,4 @@
+const RIGHT = (one) => {
+    someMethodCall();
+    return ChangeMe;
+}
Index: t/t4018/typescript-class-member-function
diff --git a/t/t4018/typescript-class-member-function b/t/t4018/typescript-class-member-function
new file mode 100644
--- /dev/null	(revision b60d253ea78063d444f7131c3100388a7cdac060)
+++ b/t/t4018/typescript-class-member-function	(revision b60d253ea78063d444f7131c3100388a7cdac060)
@@ -0,0 +1,7 @@
+class Test {
+	var one;
+	function RIGHT(two: string) {
+		someMethodCall();
+		return ChangeMe;
+	}
+}
Index: t/t4018/typescript-enum
diff --git a/t/t4018/typescript-enum b/t/t4018/typescript-enum
new file mode 100644
--- /dev/null	(revision b60d253ea78063d444f7131c3100388a7cdac060)
+++ b/t/t4018/typescript-enum	(revision b60d253ea78063d444f7131c3100388a7cdac060)
@@ -0,0 +1,6 @@
+enum RIGHT {
+    ONE = 1,
+    TWO,
+    THREE,
+    ChangeMe
+}
Index: t/t4018/typescript-function
diff --git a/t/t4018/typescript-function b/t/t4018/typescript-function
new file mode 100644
--- /dev/null	(revision b60d253ea78063d444f7131c3100388a7cdac060)
+++ b/t/t4018/typescript-function	(revision b60d253ea78063d444f7131c3100388a7cdac060)
@@ -0,0 +1,4 @@
+function RIGHT<Type implements AnotherType>(one: number): Type {
+    someMethodCall();
+    return ChangeMe;
+}
Index: t/t4018/typescript-function-assignment
diff --git a/t/t4018/typescript-function-assignment b/t/t4018/typescript-function-assignment
new file mode 100644
--- /dev/null	(revision b60d253ea78063d444f7131c3100388a7cdac060)
+++ b/t/t4018/typescript-function-assignment	(revision b60d253ea78063d444f7131c3100388a7cdac060)
@@ -0,0 +1,4 @@
+const RIGHT = function(one: number): Type {
+    someMethodCall();
+    return ChangeMe;
+}
Index: t/t4018/typescript-interface
diff --git a/t/t4018/typescript-interface b/t/t4018/typescript-interface
new file mode 100644
--- /dev/null	(revision b60d253ea78063d444f7131c3100388a7cdac060)
+++ b/t/t4018/typescript-interface	(revision b60d253ea78063d444f7131c3100388a7cdac060)
@@ -0,0 +1,4 @@
+interface RIGHT {
+  one?: string;
+  [propName: ChangeMe]: any;
+}
\ No newline at end of file
Index: t/t4018/typescript-type
diff --git a/t/t4018/typescript-type b/t/t4018/typescript-type
new file mode 100644
--- /dev/null	(revision b60d253ea78063d444f7131c3100388a7cdac060)
+++ b/t/t4018/typescript-type	(revision b60d253ea78063d444f7131c3100388a7cdac060)
@@ -0,0 +1,4 @@
+type RIGHT = {
+  one: number,
+  ChangeMe: CustomType
+}
\ No newline at end of file
Index: t/t4034-diff-words.sh
diff --git a/t/t4034-diff-words.sh b/t/t4034-diff-words.sh
--- a/t/t4034-diff-words.sh	(revision b60d253ea78063d444f7131c3100388a7cdac060)
+++ b/t/t4034-diff-words.sh	(revision be6b88ac5ca33921af60ee42f71397011efb1806)
@@ -338,6 +338,7 @@
 test_language_driver ruby
 test_language_driver scheme
 test_language_driver tex
+test_language_driver typescript
 
 test_expect_success 'word-diff with diff.sbe' '
 	cat >pre <<-\EOF &&
Index: t/t4034/typescript/expect
diff --git a/t/t4034/typescript/expect b/t/t4034/typescript/expect
new file mode 100644
--- /dev/null	(revision be6b88ac5ca33921af60ee42f71397011efb1806)
+++ b/t/t4034/typescript/expect	(revision be6b88ac5ca33921af60ee42f71397011efb1806)
@@ -0,0 +1,57 @@
+<BOLD>diff --git a/pre b/post<RESET>
+<BOLD>index e4a51a2..9c56465 100644<RESET>
+<BOLD>--- a/pre<RESET>
+<BOLD>+++ b/post<RESET>
+<CYAN>@@ -1,16 +1,16 @@<RESET>
+log("Hello World<RED>!\n<RESET><GREEN>?<RESET>")
+<GREEN>(<RESET>1<GREEN>) (<RESET>-1e10<GREEN>) (<RESET>0xabcdef<GREEN>) u<RESET>'<RED>x<RESET><GREEN>y<RESET>'
+!<RED>a<RESET><GREEN>x<RESET> ~<RED>a a<RESET><GREEN>x x<RESET>++ <RED>a<RESET><GREEN>x<RESET>-- <RED>a<RESET><GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>&<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>*<RED>b a<RESET><GREEN>y x<RESET>/<RED>b a<RESET><GREEN>y x<RESET>%<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>+<RED>b a<RESET><GREEN>y x<RESET>-<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET><<<RED>b a<RESET><GREEN>y x<RESET>>><RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET><<RED>b a<RESET><GREEN>y x<RESET><=<RED>b a<RESET><GREEN>y x<RESET>><RED>b a<RESET><GREEN>y x<RESET>>=<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>==<RED>b a<RESET><GREEN>y x<RESET>!=<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>&<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>^<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>|<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>&&<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>||<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>?<RED>b<RESET><GREEN>y<RESET>:z
+<RED>a<RESET><GREEN>x<RESET>=<RED>b a<RESET><GREEN>y x<RESET>+=<RED>b a<RESET><GREEN>y x<RESET>-=<RED>b a<RESET><GREEN>y x<RESET>*=<RED>b a<RESET><GREEN>y x<RESET>/=<RED>b a<RESET><GREEN>y x<RESET>%=<RED>b a<RESET><GREEN>y x<RESET><<=<RED>b a<RESET><GREEN>y x<RESET>>>=<RED>b a<RESET><GREEN>y x<RESET>&=<RED>b a<RESET><GREEN>y x<RESET>^=<RED>b a<RESET><GREEN>y x<RESET>|=<RED>b
+<RESET>
+<RED>a<RESET><GREEN>y
+<RESET>
+<GREEN>x<RESET>,y
Index: t/t4034/typescript/post
diff --git a/t/t4034/typescript/post b/t/t4034/typescript/post
new file mode 100644
--- /dev/null	(revision be6b88ac5ca33921af60ee42f71397011efb1806)
+++ b/t/t4034/typescript/post	(revision be6b88ac5ca33921af60ee42f71397011efb1806)
@@ -0,0 +1,16 @@
+log("Hello World?")
+(1) (-1e10) (0xabcdef) u'y'
+!x ~x x++ x-- x*y x&y
+x*y x/y x%y
+x+y x-y
+x<<y x>>y
+x<y x<=y x>y x>=y
+x==y x!=y
+x&y
+x^y
+x|y
+x&&y
+x||y
+x?y:z
+x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
+x,y
Index: t/t4034/typescript/pre
diff --git a/t/t4034/typescript/pre b/t/t4034/typescript/pre
new file mode 100644
--- /dev/null	(revision be6b88ac5ca33921af60ee42f71397011efb1806)
+++ b/t/t4034/typescript/pre	(revision be6b88ac5ca33921af60ee42f71397011efb1806)
@@ -0,0 +1,16 @@
+log("Hello World!\n")
+1 -1e10 0xabcdef 'x'
+!a ~a a++ a-- a*b a&b
+a*b a/b a%b
+a+b a-b
+a<<b a>>b
+a<b a<=b a>b a>=b
+a==b a!=b
+a&b
+a^b
+a|b
+a&&b
+a||b
+a?b:z
+a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b
+a,y
Index: Documentation/gitattributes.txt
diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
--- a/Documentation/gitattributes.txt	(revision be6b88ac5ca33921af60ee42f71397011efb1806)
+++ b/Documentation/gitattributes.txt	(revision 2891f81b087a3f1c89d1417c40ba576aaa30feb9)
@@ -902,6 +902,8 @@
 
 - `tex` suitable for source code for LaTeX documents.
 
+- `typescript` suitable for source code for TypeScript language.
+
 
 Customizing word diff
 ^^^^^^^^^^^^^^^^^^^^^
