fix: Add Symbol.observable typings and isolate const enums

.changeset/new-feet-sell.md

@@ -0,0 +1,5 @@
+---
+'wonka': patch
+---
+
+Fix missing `Symbol.observable` typings and remove `const enum` exports, which aren't usable in isolated modules.

package.json

@@ -99,7 +99,7 @@
     "rollup-plugin-cjs-check": "^1.0.1",
     "rollup-plugin-dts": "^5.1.1",
     "tslib": "^2.4.1",
-    "typescript": "^4.9.3",
+    "typescript": "^4.9.5",
     "vitest": "^0.25.3",
     "zen-observable": "^0.10.0"
   }

src/index.ts

@@ -10,7 +10,18 @@
  * @packageDocumentation
  */
 
-export * from './types';
+export type {
+  TeardownFn,
+  Signal,
+  Sink,
+  Source,
+  Operator,
+  TypeOfSource,
+  Subscription,
+  Observer,
+  Subject,
+} from './types';
+
 export * from './sources';
 export * from './operators';
 export * from './sinks';

src/observable.ts

@@ -1,6 +1,12 @@
 import { Source, SignalKind, TalkbackKind } from './types';
 import { push, start, talkbackPlaceholder } from './helpers';
 
+declare global {
+  interface SymbolConstructor {
+    readonly observable: symbol;
+  }
+}
+
 /** A definition of the ES Observable Subscription type that is returned by
  * {@link Observable.subscribe}
  *
@@ -124,7 +130,8 @@ interface Observable<T> {
  *
  * @internal
  */
-const observableSymbol = (): typeof Symbol.observable => Symbol.observable || '@@observable';
+const observableSymbol = (): typeof Symbol.observable =>
+  Symbol.observable || ('@@observable' as any);
 
 /** Converts an ES Observable to a {@link Source}.
  * @param input - The {@link ObservableLike} object that will be converted.

tsconfig.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "forceConsistentCasingInFileNames": true,
+    "importsNotUsedAsValues": "remove",
     "noEmit": true,
     "esModuleInterop": true,
     "noUnusedLocals": true,
@@ -16,7 +17,8 @@
     "strict": true,
     "noImplicitAny": false,
     "noUnusedParameters": true,
-    "skipLibCheck": true
+    "skipLibCheck": true,
+    "isolatedModules": true
   },
   "include": ["src"]
 }