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-rw-r--r--templates/javascript/src/lib.ts3
1 files changed, 3 insertions, 0 deletions
diff --git a/templates/javascript/src/lib.ts b/templates/javascript/src/lib.ts
new file mode 100644
index 0000000..38ba65b
--- /dev/null
+++ b/templates/javascript/src/lib.ts
@@ -0,0 +1,3 @@
+export function unreachable(msg: string): never {
+  throw new Error(msg);
+}