diff --git a/src/fs.ts b/src/fs.ts
index 0d3311a..9ea5a4e 100644
--- a/src/fs.ts
+++ b/src/fs.ts
@@ -53,6 +53,10 @@ export class OnePasswordFileManager {
     invariant(fs.existsSync(this.root), `Profile ${profileName} does not exist.`)
   }
 
+  #hasFile(path: string) {
+    return this.fs.existsSync(resolve(this.root, path))
+  }
+
   async #readFile(path: string) {
     return await this.fs.readFile(resolve(this.root, path), "utf-8")
   }
@@ -70,9 +74,10 @@ export class OnePasswordFileManager {
   }
 
   async getBand(name: string) {
-    try {
-      return await this.#readFile(`band_${name.toUpperCase()}.js`)
-    } catch {}
+    const fileName = `band_${name.toUpperCase()}.js`
+    if (this.#hasFile(fileName)) {
+      return await this.#readFile(fileName)
+    }
   }
 
   setProfile(profile: string) {
diff --git a/src/models.ts b/src/models.ts
new file mode 100644
index 0000000..bc6789a
--- /dev/null
+++ b/src/models.ts
@@ -0,0 +1,39 @@
+import invariant from "tiny-invariant"
+
+export enum Category {
+  Login = 1,
+  CreditCard = 2,
+  SecureNote = 3,
+  Identity = 4,
+  Password = 5,
+  Tombstone = 99,
+  SoftwareLicense = 100,
+  BankAccount = 101,
+  Database = 102,
+  DriverLicense = 103,
+  OutdoorLicense = 104,
+  Membership = 105,
+  Passport = 106,
+  Rewards = 107,
+  SSN = 108,
+  Router = 109,
+  Server = 100,
+  Email = 111,
+}
+
+export enum FieldType {
+  Password = "P",
+  Text = "T",
+  Email = "E",
+  Number = "N",
+  Radio = "R",
+  Telephone = "TEL",
+  Checkbox = "C",
+  URL = "U",
+}
+
+export function getCategory(category: string) {
+  const int = parseInt(category)
+  invariant(int in Category, `Invalid category: ${category}`)
+  return int as Category
+}
diff --git a/tsconfig.json b/tsconfig.json
index de6888f..b041711 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,11 +10,9 @@
     "noUnusedLocals": true,
     "noUnusedParameters": true,
     "resolveJsonModule": true,
-    "strictBindCallApply": true,
-    "strictFunctionTypes": true,
-    "strictNullChecks": true,
+    "strict": true,
     "stripInternal": true,
-    "target": "es2020",
+    "target": "esnext",
     "esModuleInterop": true
   },
   "ts-node": {