stuffy

server/utils/mustbe.js

@@ -0,0 +1,44 @@
+export function mustBe(value, ...types) {
+    //
+    // empty type enforcement.
+    // Means we just want value to be define
+    if (types.length === 0 && typeof value !== "undefined") {
+        return value;
+    }
+
+    //
+    // value has a valid type
+    if (types.includes(typeof value)) {
+        return value;
+    }
+
+    // NOTE: only checks first element of array if it's a string.
+    if (types.includes("strings[]") && Array.isArray(value) && (value.length === 0 || typeof value[0] === "string")) {
+        return value;
+    }
+
+    throw new Error("Invalid data type. Expected >>" + types.join(" or ") + "<< but got " + typeof value);
+}
+
+export function mustBeString(value) {
+    return mustBe(value, "string");
+}
+
+export function mustBeInteger(value) {
+    if (typeof value === "number" && Number.isSafeInteger(value)) {
+        return value;
+    }
+}
+
+/**
+ *
+ * @param {string} str
+ * @param {RegExp} regex
+ */
+export function mustMatch(str, regex) {
+    if (!regex.test(str)) {
+        throw new Error(`String did not satisfy ${regex}`);
+    }
+
+    return str;
+}