Optionally use strong type hierarchies for read outputs and write inputs.

README.md

@@ -51,6 +51,27 @@ co(
 );
 ```
 
+## TypeScript write placeholders
+
+`NodeFire` supports separate read and write type shapes.  The optional second generic parameter
+defines special write-value patterns, and defaults to none.
+
+Each pattern is `[keyPattern, baseType, specialValue]`, where `specialValue` is allowed for keys
+matching `keyPattern` when the field includes `baseType`.
+All nested write properties also accept `null` to support Firebase delete semantics.
+
+```ts
+import NodeFire from 'nodefire';
+
+type CounterIncrement = {'.sv': {increment: number}};
+type WritePatterns = [
+  [`${string}timestamp`, number, {'.sv': string}],
+  [`${string}Count`, number, CounterIncrement]
+];
+
+const db = new NodeFire<FirebaseData, WritePatterns>(admin.database().ref());
+```
+
 ## API
 
 This is reproduced from the source code, which is authoritative.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nodefire",
-  "version": "4.0.0",
+  "version": "4.1.0",
   "description": "A promise-centric Firebase library for NodeJS",
   "main": "built/index.js",
   "types": "built/index.d.ts",