Add an assertion when updating conversations; update cleanData

ts/environment.ts

@@ -0,0 +1,49 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// Many places rely on this enum being a string.
+export enum Environment {
+  Development = 'development',
+  Production = 'production',
+  Staging = 'staging',
+  Test = 'test',
+  TestLib = 'test-lib',
+}
+
+let environment: undefined | Environment;
+
+export function getEnvironment(): Environment {
+  if (environment === undefined) {
+    // This should never happen—we should always have initialized the environment by this
+    //   point. It'd be nice to log here but the logger depends on the environment and we
+    //   can't have circular dependencies.
+    return Environment.Production;
+  }
+  return environment;
+}
+
+/**
+ * Sets the current environment. Should be called early in a process's life, and can only
+ * be called once.
+ */
+export function setEnvironment(env: Environment): void {
+  if (environment !== undefined) {
+    throw new Error('Environment has already been set');
+  }
+  environment = env;
+}
+
+const ENVIRONMENTS_BY_STRING = new Map<string, Environment>([
+  ['development', Environment.Development],
+  ['production', Environment.Production],
+  ['staging', Environment.Staging],
+  ['test', Environment.Test],
+  ['test-lib', Environment.TestLib],
+]);
+export function parseEnvironment(value: unknown): Environment {
+  if (typeof value !== 'string') {
+    return Environment.Production;
+  }
+  const result = ENVIRONMENTS_BY_STRING.get(value);
+  return result || Environment.Production;
+}