diff --git a/package-lock.json b/package-lock.json
index dc05ff3c6..b983b8851 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,7 +7,7 @@
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           "version": "4.1.0",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "integrity": "sha1-i5+PCM8ay4Q3Vqg5yox+MWjFGZc=",
           "dev": true
         },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "integrity": "sha1-InZ74htirxCBV0MG9prFG2IgOWE=",
           "dev": true,
           "requires": {
             "emoji-regex": "^7.0.1",
@@ -1705,7 +1705,7 @@
         "strip-ansi": {
           "version": "5.2.0",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "integrity": "sha1-jJpTb+tq/JYr36WxBKUJHBrZwK4=",
           "dev": true,
           "requires": {
             "ansi-regex": "^4.1.0"
@@ -1726,7 +1726,7 @@
     "yargs-unparser": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
-      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "integrity": "sha1-7yXCx2n/a9CeSw+dfGBfsnhG6p8=",
       "dev": true,
       "requires": {
         "flat": "^4.1.0",
@@ -1737,7 +1737,7 @@
     "yn": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
-      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q=="
+      "integrity": "sha1-HodAGgnXZ8HV6rJqbkwYUYLS61A="
     }
   }
 }
diff --git a/package.json b/package.json
index 4c4eb65f0..b966398ba 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "@types/chai": "^4.0.4",
     "@types/diff": "^4.0.2",
     "@types/mocha": "^5.2.7",
-    "@types/node": "^13.13.1",
+    "@types/node": "13.13.5",
     "@types/proxyquire": "^1.3.28",
     "@types/react": "^16.0.2",
     "@types/semver": "^7.1.0",
@@ -76,7 +76,7 @@
     "semver": "^7.1.3",
     "tslint": "^6.1.0",
     "tslint-config-standard": "^9.0.0",
-    "typescript": "^3.7.2",
+    "typescript": "3.8.3",
     "typescript-json-schema": "^0.42.0"
   },
   "peerDependencies": {
diff --git a/src/esm.ts b/src/esm.ts
index ed1e6003c..2443d7f7b 100644
--- a/src/esm.ts
+++ b/src/esm.ts
@@ -66,7 +66,7 @@ export function registerAndCreateEsmHooks (opts?: RegisterOptions) {
     assert(pathname !== null, 'ESM getFormat() hook: URL should never have null pathname')
 
     // If file has .ts, .tsx, or .jsx extension, then ask node how it would treat this file if it were .js
-    const ext = posixPath.extname(pathname!)
+    const ext = posixPath.extname(pathname)
     if (ext === '.ts' || ext === '.tsx' || ext === '.jsx') {
       return defer(formatUrl({
         ...parsed,