started mongo stuff, but it's a PITA. fuck mongo

parts/3/phonebookBackend/node_modules/mongoose/lib/cast/bigint.js

@@ -0,0 +1,46 @@
+'use strict';
+
+const { Long } = require('bson');
+
+/**
+ * Given a value, cast it to a BigInt, or throw an `Error` if the value
+ * cannot be casted. `null` and `undefined` are considered valid.
+ *
+ * @param {Any} value
+ * @return {Number}
+ * @throws {Error} if `value` is not one of the allowed values
+ * @api private
+ */
+
+const MAX_BIGINT = 9223372036854775807n;
+const MIN_BIGINT = -9223372036854775808n;
+const ERROR_MESSAGE = `Mongoose only supports BigInts between ${MIN_BIGINT} and ${MAX_BIGINT} because MongoDB does not support arbitrary precision integers`;
+
+module.exports = function castBigInt(val) {
+  if (val == null) {
+    return val;
+  }
+  if (val === '') {
+    return null;
+  }
+  if (typeof val === 'bigint') {
+    if (val > MAX_BIGINT || val < MIN_BIGINT) {
+      throw new Error(ERROR_MESSAGE);
+    }
+    return val;
+  }
+
+  if (val instanceof Long) {
+    return val.toBigInt();
+  }
+
+  if (typeof val === 'string' || typeof val === 'number') {
+    val = BigInt(val);
+    if (val > MAX_BIGINT || val < MIN_BIGINT) {
+      throw new Error(ERROR_MESSAGE);
+    }
+    return val;
+  }
+
+  throw new Error(`Cannot convert value to BigInt: "${val}"`);
+};