4 files changed, 40 insertions, 32 deletions
diff --git a/src/lib/functions.ts b/src/lib/functions.ts
index 0ec9f00..21fdad9 100644
--- a/src/lib/functions.ts
+++ b/src/lib/functions.ts
@@ -1,4 +1,4 @@
-export function debounce(func: Function, timeout: number) {
+export function debounce(func: Function, timeout: number): any {
   let timer: any
   return (...args: any) => {
     clearTimeout(timer)
diff --git a/src/lib/i18n.ts b/src/lib/i18n.ts
index cd5b3de..3716367 100644
--- a/src/lib/i18n.ts
+++ b/src/lib/i18n.ts
@@ -1,4 +1,9 @@
-export function unit(n: number, singular: string, plural: string, f: (n: number, unit: string) => string = format): string {
+export function unit(
+  n: number, 
+  singular: string, 
+  plural: string, 
+  f: (n: number, unit: string) => string = format
+): string {
   return n > 1
     ? f(n, plural)
     : f(n, singular)
diff --git a/src/lib/rx.ts b/src/lib/rx.ts
index 1b41c27..bf01b6d 100644
--- a/src/lib/rx.ts
+++ b/src/lib/rx.ts
@@ -1,41 +1,48 @@
-// Html
+// [1.0.1] 2023-02-13
 
-export interface Html {
-  type: 'Tag' | 'WithVar'
-}
+// Html
 
-export interface Tag extends Html {
+export type Html
+  = false 
+  | undefined 
+  | string 
+  | number 
+  | Tag 
+  | WithVar<any> 
+  | Array<Html>
+  | Rx<Html> 
+
+interface Tag {
   type: 'Tag'
   tagName: string
   attributes: Attributes
-  children?: Array<Child>
+  children?: Array<Html>
   onmount?: (element: Element) => void
   onunmount?: (element: Element) => void
 }
 
-export interface WithVar<A> extends Html {
+interface WithVar<A> {
   type: 'WithVar'
   init: A
-  getChildren: (v: Var<A>, update: (f: (value: A) => A) => void) => Child
+  getChildren: (v: Var<A>, update: (f: (value: A) => A) => void) => Html
 }
 
 interface Attributes {
   [key: string]: Rx<AttributeValue> | AttributeValue
 }
 
-export type AttributeValue
+type AttributeValue
   = string
   | number
   | boolean
   | ((event: Event) => void)
   | ((element: Element) => void)
 
-export type Child = false | undefined | string | number | Html | Rx<Child> | Array<Child>
-
-function isChild(x: any): x is Child {
+function isHtml(x: any): x is Html {
   return (typeof x === 'string'
     || typeof x === 'number'
-    || isHtml(x)
+    || isTag(x) 
+    || isWithVar(x)
     || isRx(x)
     || Array.isArray(x))
 }
@@ -44,8 +51,8 @@ type ValueOrArray<T> = T | Array<ValueOrArray<T>>
 
 export function h(
   tagName: string,
-  x?: Attributes | Child,
-  ...children: Array<Child>
+  x?: Attributes | Html,
+  ...children: Array<Html>
 ): Tag {
   if (x === undefined || x === false) {
     return {
@@ -53,7 +60,7 @@ export function h(
       tagName,
       attributes: {}
     }
-  } else if (isChild(x)) {
+  } else if (isHtml(x)) {
     return {
       type: 'Tag',
       tagName,
@@ -82,7 +89,7 @@ export function h(
   }
 }
 
-export function withVar<A>(init: A, getChildren: (v: Var<A>, update: (f: (value: A) => A) => void) => Child): WithVar<A> {
+export function withVar<A>(init: A, getChildren: (v: Var<A>, update: (f: (value: A) => A) => void) => Html): WithVar<A> {
   return {
     type: 'WithVar',
     init,
@@ -115,7 +122,7 @@ class Var<A> extends Rx<A> {
   }
 }
 
-export class Map<A, B> extends Rx<B> {
+class Map<A, B> extends Rx<B> {
   readonly type: 'Map'
   readonly rx: Rx<A>
   readonly f: (value: A) => B
@@ -128,7 +135,7 @@ export class Map<A, B> extends Rx<B> {
   }
 }
 
-export class FlatMap<A, B> extends Rx<B> {
+class FlatMap<A, B> extends Rx<B> {
   readonly type: 'FlatMap'
   readonly rx: Rx<A>
   readonly f: (value: A) => Rx<B>
@@ -143,9 +150,9 @@ export class FlatMap<A, B> extends Rx<B> {
 
 // Mount
 
-export function mount(child: Child): Cancelable {
+export function mount(html: Html): Cancelable {
   const state = new State()
-  let appendRes = appendChild(state, document.body, child)
+  let appendRes = appendChild(state, document.body, html)
   return appendRes.cancel
 }
 
@@ -258,7 +265,7 @@ interface AppendResult {
   lastAdded?: Node
 }
 
-function appendChild(state: State, element: Element, child: Child, lastAdded?: Node): AppendResult {
+function appendChild(state: State, element: Element, child: Html, lastAdded?: Node): AppendResult {
   if (Array.isArray(child)) {
     let cancels: Array<Cancelable> = []
     let removes: Array<Removable> = []
@@ -335,7 +342,7 @@ function appendChild(state: State, element: Element, child: Child, lastAdded?: N
       remove: voidRemove,
       lastAdded: rxBase
     }
-    const cancelRx = rxRun(state, child, (value: Child) => {
+    const cancelRx = rxRun(state, child, (value: Html) => {
       appendRes.cancel()
       appendRes.remove()
       appendRes = appendChild(state, element, value, rxBase)
@@ -362,10 +369,6 @@ function appendChild(state: State, element: Element, child: Child, lastAdded?: N
   }
 }
 
-function isHtml<A>(x: any): x is Html {
-  return isTag<A>(x) || isWithVar<A>(x)
-}
-
 function isTag<A>(x: any): x is Tag {
   return x !== undefined && x.type === "Tag"
 }
diff --git a/src/view/filters.ts b/src/view/filters.ts
index 9ce277b..efe4115 100644
--- a/src/view/filters.ts
+++ b/src/view/filters.ts
@@ -1,4 +1,4 @@
-import { h, Rx } from 'lib/rx'
+import { h, Rx, Html } from 'lib/rx'
 import * as Book from 'book'
 import * as I18n from 'lib/i18n'
 
@@ -18,7 +18,7 @@ interface ViewFiltersParams {
   updateFilters: (f: (filters: Model) => Model) => void
 }
 
-export function view({ filteredBooks, filters, updateFilters }: ViewFiltersParams) {
+export function view({ filteredBooks, filters, updateFilters }: ViewFiltersParams): Html {
   return h('ul',
     h('li', [
       h('div', { className: 'g-FilterTitle' }, 'Lecture'),
@@ -40,7 +40,7 @@ interface ReadFilterParams {
   update: (status?: Book.ReadStatus) => void
 }
 
-function readFilter({ filteredBooks, readStatus, update }: ReadFilterParams) {
+function readFilter({ filteredBooks, readStatus, update }: ReadFilterParams): Html {
   return h('ul',
     { className: 'g-Filters' },
     readStatus.map(currentStatus => {