Convert to typescript; Update naming to follow rxfire; Support sub modules

Author: chrisbianca

.babelrc.js

@@ -1,11 +1,11 @@
 # NPM / Yarn
+.rpt2_cache
 node_modules
 npm-debug.log
 
-# Build output
-dist
-lib
-es
+# Rollup build output
+**/dist
+**/*.d.ts
 
 # OS files
 .DS_Store

.eslintrc

@@ -0,0 +1 @@
+export { default as useAuthState, AuthStateHook } from './useAuthState';

.flowconfig

@@ -0,0 +1,6 @@
+{
+  "name": "react-firebase-hooks/auth",
+  "main": "dist/index.cjs.js",
+  "module": "dist/index.esm.js",
+  "typings": "dist/auth/index.d.ts"
+}

.gitignore

@@ -0,0 +1,25 @@
+import { auth, User } from 'firebase';
+import { useEffect } from 'react';
+import { useDataLoader } from '../util';
+
+export type AuthStateHook = {
+  user?: firebase.User;
+  initialising: boolean;
+};
+
+export default (auth: auth.Auth): AuthStateHook => {
+  const { loading, setValue, value } = useDataLoader<User>();
+
+  useEffect(() => {
+    const listener = auth.onAuthStateChanged(setValue);
+
+    return () => {
+      listener();
+    };
+  }, []);
+
+  return {
+    initialising: loading,
+    user: value,
+  };
+};

auth/index.ts

@@ -0,0 +1,2 @@
+export { default as useList, ListHook } from './useList';
+export { default as useObject, ObjectHook } from './useObject';

auth/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "react-firebase-hooks/database",
+  "main": "dist/index.cjs.js",
+  "module": "dist/index.esm.js",
+  "typings": "dist/database/index.d.ts"
+}

auth/useAuthState.ts

@@ -0,0 +1,153 @@
+import { database } from 'firebase';
+import { useEffect, useState } from 'react';
+
+export type ListHook = {
+  error?: Object;
+  list: database.DataSnapshot[];
+  loading: boolean;
+};
+
+type KeyValueState = {
+  keys: string[];
+  values: database.DataSnapshot[];
+};
+
+export default (query: database.Query): ListHook => {
+  const [error, setError] = useState(false);
+  const [loading, setLoading] = useState(true);
+  // Combine keys and values in a single state hook to allow them to be manipulated together
+  const [{ values }, setKeysValues] = useState({ keys: [], values: [] });
+
+  const onChildAdded = (
+    snapshot: database.DataSnapshot | null,
+    previousKey?: string | null
+  ) => {
+    setKeysValues((prevKeyValueState: KeyValueState) => {
+      return snapshot
+        ? addChild(prevKeyValueState, snapshot, previousKey)
+        : prevKeyValueState;
+    });
+  };
+
+  const onChildChanged = (snapshot: database.DataSnapshot | null) => {
+    setKeysValues((prevKeyValueState: KeyValueState) => {
+      if (!snapshot || !snapshot.key) {
+        return prevKeyValueState;
+      }
+
+      const index = prevKeyValueState.keys.indexOf(snapshot.key);
+      return {
+        ...prevKeyValueState,
+        values: [
+          ...prevKeyValueState.values.slice(0, index),
+          snapshot,
+          ...prevKeyValueState.values.slice(index + 1),
+        ],
+      };
+    });
+  };
+
+  const onChildMoved = (
+    snapshot: database.DataSnapshot | null,
+    previousKey?: string | null
+  ) => {
+    setKeysValues((prevKeyValueState: KeyValueState) => {
+      if (!snapshot) {
+        return prevKeyValueState;
+      }
+      // Remove the child from it's previous location
+      const tempKeyValueState = removeChild(prevKeyValueState, snapshot);
+      // Add the child into it's new location
+      return addChild(tempKeyValueState, snapshot, previousKey);
+    });
+  };
+
+  const onChildRemoved = (snapshot: database.DataSnapshot | null) => {
+    setKeysValues((prevKeyValueState: KeyValueState) => {
+      return snapshot
+        ? removeChild(prevKeyValueState, snapshot)
+        : prevKeyValueState;
+    });
+  };
+
+  useEffect(
+    () => {
+      // This is here to indicate that all the data has been successfully received
+      query.once(
+        'value',
+        () => {
+          setLoading(false);
+        },
+        (err: object) => {
+          setError(err);
+          setLoading(false);
+        }
+      );
+      query.on('child_added', onChildAdded);
+      query.on('child_changed', onChildChanged);
+      query.on('child_moved', onChildMoved);
+      query.on('child_removed', onChildRemoved);
+
+      return () => {
+        query.off('child_added', onChildAdded);
+        query.off('child_changed', onChildChanged);
+        query.off('child_moved', onChildMoved);
+        query.off('child_removed', onChildRemoved);
+      };
+    },
+    // TODO: Check if this works suitably for 'query' parameters
+    [query]
+  );
+
+  return {
+    error,
+    list: values,
+    loading,
+  };
+};
+
+const addChild = (
+  keyValueState: KeyValueState,
+  snapshot: firebase.database.DataSnapshot,
+  previousKey?: string | null
+): KeyValueState => {
+  if (!snapshot.key) {
+    return keyValueState;
+  }
+
+  const { keys, values } = keyValueState;
+  if (!previousKey) {
+    // The child has been added to the start of the list
+    return {
+      keys: [snapshot.key, ...keys],
+      values: [snapshot, ...values],
+    };
+  }
+  // Establish the index for the previous child in the list
+  const index = keys.indexOf(previousKey);
+  // Insert the item after the previous child
+  return {
+    keys: [...keys.slice(0, index + 1), snapshot.key, ...keys.slice(index + 1)],
+    values: [
+      ...values.slice(0, index + 1),
+      snapshot,
+      ...values.slice(index + 1),
+    ],
+  };
+};
+
+const removeChild = (
+  keyValueState: KeyValueState,
+  snapshot: firebase.database.DataSnapshot
+): KeyValueState => {
+  if (!snapshot.key) {
+    return keyValueState;
+  }
+
+  const { keys, values } = keyValueState;
+  const index = keys.indexOf(snapshot.key);
+  return {
+    keys: [...keys.slice(0, index), ...keys.slice(index + 1)],
+    values: [...values.slice(0, index), ...values.slice(index + 1)],
+  };
+};