diff --git a/packages/typescript/4.2.3/build.sh b/packages/typescript/4.2.3/build.sh
new file mode 100755
index 0000000..83ab333
--- /dev/null
+++ b/packages/typescript/4.2.3/build.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+source ../../node/15.10.0/build.sh
+
+source ./environment
+
+bin/npm install -g typescript@4.2.3
\ No newline at end of file
diff --git a/packages/typescript/4.2.3/compile b/packages/typescript/4.2.3/compile
new file mode 100644
index 0000000..1258d16
--- /dev/null
+++ b/packages/typescript/4.2.3/compile
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+# Put instructions to compile source code, remove this file if the language does not require this stage
+
+tsc $*
\ No newline at end of file
diff --git a/packages/typescript/4.2.3/environment b/packages/typescript/4.2.3/environment
new file mode 100644
index 0000000..780b668
--- /dev/null
+++ b/packages/typescript/4.2.3/environment
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+# Put 'export' statements here for environment variables
+export PATH=$PWD/bin:$PATH
diff --git a/packages/typescript/4.2.3/metadata.json b/packages/typescript/4.2.3/metadata.json
new file mode 100644
index 0000000..f4a54de
--- /dev/null
+++ b/packages/typescript/4.2.3/metadata.json
@@ -0,0 +1,6 @@
+{
+  "language": "typescript",
+  "version": "4.2.3",
+  "aliases": ["ts","node-ts","tsc"],
+  "author": "Thomas Hobson <git@hexf.me>"
+}
diff --git a/packages/typescript/4.2.3/run b/packages/typescript/4.2.3/run
new file mode 100644
index 0000000..dfd4249
--- /dev/null
+++ b/packages/typescript/4.2.3/run
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+# Put instructions to run the runtime
+
+CODE=$(sed 's/ts$/js/' <<<"$1")
+shift
+
+node $CODE $*
diff --git a/packages/typescript/4.2.3/test.ts b/packages/typescript/4.2.3/test.ts
new file mode 100644
index 0000000..56ed4a0
--- /dev/null
+++ b/packages/typescript/4.2.3/test.ts
@@ -0,0 +1 @@
+console.log("OK")
\ No newline at end of file