Housekeeping

frontend/src/lib/mongo.js

@@ -0,0 +1,34 @@
+import { ObjectId } from 'bson';
+
+// Calculate the min and max values of (un)signed integers with n bits
+export const intMin = bits => Math.pow(2, bits - 1) * -1;
+export const intMax = bits => Math.pow(2, bits - 1) - 1;
+export const uintMax = bits => Math.pow(2, bits) - 1;
+
+// Boundaries for some ubiquitous integer types
+export const int32 = [ intMin(32), intMax(32) ];
+export const int64 = [ intMin(64), intMax(64) ];
+export const uint64 = [ 0, uintMax(64) ];
+
+// Input types
+export const numericInputTypes = [ 'int', 'long', 'uint64', 'double', 'decimal' ];
+export const inputTypes = [ 'string', 'objectid', 'bool', 'date', ...numericInputTypes ];
+
+export function isBsonBuiltin(value) {
+  return (
+    (typeof value === 'object') &&
+    (value !== null) &&
+    (typeof value._bsontype === 'string') &&
+    (typeof value.inspect === 'function')
+  );
+}
+
+export function canBeObjectId(value) {
+  try {
+    new ObjectId(value);
+    return true;
+  }
+  catch {
+    return false;
+  }
+}