diff --git a/tools/deploy/deploy.js b/tools/deploy/deploy.ts
similarity index 74%
rename from tools/deploy/deploy.js
rename to tools/deploy/deploy.ts
index 13e0cf10..06c13ed2 100644
--- a/tools/deploy/deploy.js
+++ b/tools/deploy/deploy.ts
@@ -2,7 +2,7 @@
 import fs from 'fs';
 import pathlib from 'path';
 
-export function link(pairs, dstDir) {
+export function link(pairs : {src : string, dst : string}[], dstDir : string) {
     for (let {src, dst} of pairs) {
         dst = pathlib.join(dstDir, dst);
         fs.mkdirSync(pathlib.dirname(dst), {recursive: true});
diff --git a/tools/deploy/find.js b/tools/deploy/find.ts
similarity index 89%
rename from tools/deploy/find.js
rename to tools/deploy/find.ts
index 6026654d..8084bffb 100644
--- a/tools/deploy/find.js
+++ b/tools/deploy/find.ts
@@ -2,7 +2,7 @@
 import fs from 'fs';
 import pathlib from 'path';
 
-export function find(startDir, tag) {
+export function find(startDir : string, tag : string) {
     const stack = [startDir];
     const results = [];
     let dir;
diff --git a/tools/deploy/package.json b/tools/deploy/package.json
index fd9774dc..d844eebf 100644
--- a/tools/deploy/package.json
+++ b/tools/deploy/package.json
@@ -1,5 +1,6 @@
 {
     "dependencies": {
+        "@types/node": "^14.0.23",
         "commander": "^5.1.0",
         "debug": "^4.1.1"
     },