diff --git a/md5/md5.d.ts b/md5/md5.d.ts
new file mode 100644
index 0000000..ab89097
--- /dev/null
+++ b/md5/md5.d.ts
@@ -0,0 +1 @@
+export default function md5(str: string): string;
diff --git a/sha1/sha1.d.ts b/sha1/sha1.d.ts
new file mode 100644
index 0000000..c1b0c2e
--- /dev/null
+++ b/sha1/sha1.d.ts
@@ -0,0 +1 @@
+export default function sha1(str: string): string;
diff --git a/sha256/sha256.d.ts b/sha256/sha256.d.ts
new file mode 100644
index 0000000..7520b38
--- /dev/null
+++ b/sha256/sha256.d.ts
@@ -0,0 +1 @@
+export default function sha256(str: string): string;