Convert logging infrastructure to TypeScript

ts/util/reallyJsonStringify.ts

@@ -0,0 +1,43 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+/**
+ * Returns `JSON.stringify(value)` if that returns a string, otherwise returns a value
+ * like `[object Object]` or `[object Undefined]`.
+ *
+ * `JSON.stringify` doesn't always return a string. Some examples:
+ *
+ *     JSON.stringify(undefined) === undefined
+ *
+ *     JSON.stringify(Symbol()) === undefined
+ *
+ *     JSON.stringify({ toJSON() {} }) === undefined
+ *
+ *     const a = {};
+ *     const b = { a };
+ *     a.b = a;
+ *     JSON.stringify(a);  // => Throws a TypeError
+ *
+ *     JSON.stringify(123n);  // => Throws a TypeError
+ *
+ *     const scary = {
+ *       toJSON() {
+ *         throw new Error('uh oh');
+ *       }
+ *     };
+ *     JSON.stringify(scary);  // => Throws "uh oh"
+ *
+ * This makes sure we return a string and don't throw.
+ */
+export function reallyJsonStringify(value: unknown): string {
+  let result: unknown;
+  try {
+    result = JSON.stringify(value);
+  } catch (_err) {
+    result = undefined;
+  }
+
+  return typeof result === 'string'
+    ? result
+    : Object.prototype.toString.call(value);
+}