East UI

Type-safe UI component library for the East language. Components return data structures describing UI layouts, enabling portable rendering across environments.

Quick Start

import { East } from "@elaraai/east";
import { Stack, Text, Button, UIComponentType } from "@elaraai/east-ui";

const MyComponent = East.function([], UIComponentType, $ => {
    return Stack.VStack([
        Text.Root("Hello, World!", { fontSize: "lg", fontWeight: "bold" }),
        Button.Root("Click Me", { variant: "solid", colorPalette: "blue" }),
    ], { gap: "4" });
});

const ir = MyComponent.toIR();

Decision Tree: Which Component to Use

Task → What do you need?
    │
    ├─ Layout (arrange content)
    │   ├─ Box → .Root() - basic container with padding, margin, bg
    │   ├─ Flex → .Root() - flexbox with direction, justify, align
    │   ├─ Stack → .HStack(), .VStack() - simplified horizontal/vertical stacking
    │   ├─ Grid → .Root() - CSS grid with templateColumns, templateRows
    │   ├─ Separator → .Root() - visual divider (horizontal/vertical)
    │   └─ Splitter → .Root() - resizable panels
    │
    ├─ Typography (display text)
    │   ├─ Text → .Root() - basic text with fontSize, fontWeight, color
    │   ├─ Heading → .Root() - semantic heading with size (h1-h6)
    │   ├─ Code → .Root() - inline code
    │   ├─ CodeBlock → .Root() - syntax-highlighted code block
    │   ├─ Link → .Root() - clickable hyperlink
    │   ├─ Highlight → .Root() - highlighted text span
    │   ├─ Mark → .Root() - marked/annotated text
    │   └─ List → .Ordered(), .Unordered() - bulleted or numbered lists
    │
    ├─ Buttons (user actions)
    │   ├─ Button → .Root() - clickable button with variant, colorPalette, onClick
    │   └─ IconButton → .Root() - icon-only button
    │
    ├─ Forms (user input)
    │   ├─ Input → .String(), .Integer(), .Float(), .DateTime() - typed text inputs
    │   ├─ Textarea → .Root() - multi-line text input
    │   ├─ Select → .Root() - dropdown selection
    │   ├─ Checkbox → .Root() - boolean checkbox
    │   ├─ Switch → .Root() - toggle switch
    │   ├─ Slider → .Root() - range slider with min, max, step
    │   ├─ Field → .Root() - form field wrapper with label, error
    │   ├─ FileUpload → .Root() - file upload input
    │   └─ TagsInput → .Root() - tag input with add/remove
    │
    ├─ Collections (display data sets)
    │   ├─ Table → .Root() - data table with columns, sorting, selection
    │   ├─ DataList → .Root() - generic data list with items
    │   ├─ TreeView → .Root() - hierarchical tree with expand/collapse
    │   ├─ Gantt → .Root() - Gantt chart for scheduling/timelines
    │   └─ Planner → .Root() - event planner/calendar
    │
    ├─ Charts (visualize data)
    │   ├─ Cartesian Charts
    │   │   ├─ Chart.Line(), .LineMulti() - line chart (single/multi series)
    │   │   ├─ Chart.Bar(), .BarMulti() - bar chart (single/multi series)
    │   │   ├─ Chart.Area(), .AreaMulti() - area chart (single/multi series)
    │   │   └─ Chart.Scatter(), .ScatterMulti() - scatter plot (single/multi series)
    │   ├─ Proportional Charts
    │   │   ├─ Chart.Pie() - pie/donut chart
    │   │   └─ Chart.Radar() - radar/spider chart
    │   ├─ Native Charts
    │   │   ├─ Chart.BarList() - horizontal bar list
    │   │   └─ Chart.BarSegment() - segmented bar
    │   └─ Sparkline → inline trend visualization
    │
    ├─ Display (show information)
    │   ├─ Badge → .Root() - small badge label
    │   ├─ Tag → .Root() - tag with optional close button
    │   ├─ Avatar → .Root() - user avatar image/initials
    │   ├─ Icon → .Root() - FontAwesome or custom icon
    │   └─ Stat → .Root() - statistic with label, value, change
    │
    ├─ Feedback (user feedback)
    │   ├─ Alert → .Root() - alert message (info, success, warning, error)
    │   └─ Progress → .Root() - progress bar or circular progress
    │
    ├─ Disclosure (reveal content)
    │   ├─ Accordion → .Root() - expandable sections
    │   ├─ Tabs → .Root() - tabbed interface
    │   └─ Carousel → .Root() - image carousel
    │
    ├─ Overlays (floating content)
    │   ├─ Dialog → .Root() - modal dialog with actions
    │   ├─ Drawer → .Root() - side drawer panel
    │   ├─ Popover → .Root() - positioned popover
    │   ├─ Tooltip → .Root() - hover tooltip
    │   ├─ Menu → .Root() - context/dropdown menu
    │   ├─ HoverCard → .Root() - hover-triggered card
    │   ├─ ActionBar → .Root() - bottom action bar
    │   └─ ToggleTip → .Root() - toggle-triggered tooltip
    │
    ├─ Container (content wrapper)
    │   └─ Card → .Root() - card with header, body, footer
    │
    └─ State (reactive data)
        ├─ State.readTyped(key, type) - read typed state
        ├─ State.writeTyped(key, option, type) - write typed state
        ├─ State.initTyped(key, value, type) - initialize if not exists
        └─ State.has(key) - check if key exists

Common Types

Type	Definition	Description
UIComponentType	VariantType({ box, flex, text, button, ... })	Recursive type for all UI components
SizeType	VariantType({ xs, sm, md, lg, xl })	Component size
ColorSchemeType	VariantType({ gray, red, green, blue, ... })	Color palette
FontWeightType	VariantType({ normal, medium, semibold, bold })	Text weight
FlexDirectionType	VariantType({ row, column, row-reverse, column-reverse })	Flex direction
JustifyContentType	VariantType({ flex-start, flex-end, center, space-between, ... })	Flex justify
AlignItemsType	VariantType({ flex-start, flex-end, center, stretch })	Flex align

Reference Documentation

• API Reference - Complete component signatures, props, and style types
• Examples - Working code examples by use case
• Full Usage Guide - Comprehensive developer guide

Available Components

Category	Components
Layout	Box, Flex, Stack, Grid, Separator, Splitter
Typography	Text, Heading, Code, CodeBlock, Link, Highlight, Mark, List
Buttons	Button, IconButton
Forms	Input, Textarea, Select, Checkbox, Switch, Slider, Field, FileUpload, TagsInput
Collections	Table, DataList, TreeView, Gantt, Planner
Charts	Chart.Line/Bar/Area/Scatter/Pie/Radar/BarList/BarSegment, Sparkline
Display	Badge, Tag, Avatar, Icon, Stat
Feedback	Alert, Progress
Disclosure	Accordion, Tabs, Carousel
Overlays	Dialog, Drawer, Popover, Tooltip, Menu, HoverCard, ActionBar, ToggleTip
Container	Card
State	State.readTyped, State.writeTyped, State.initTyped, State.has

Common Patterns

Basic Layout with Stack

import { Stack, Text, Button, UIComponentType } from "@elaraai/east-ui";

const layout = East.function([], UIComponentType, $ => {
    return Stack.VStack([
        Text.Root("Title", { fontSize: "xl", fontWeight: "bold" }),
        Text.Root("Description text here"),
        Stack.HStack([
            Button.Root("Cancel", { variant: "outline" }),
            Button.Root("Submit", { variant: "solid", colorPalette: "blue" }),
        ], { gap: "2" }),
    ], { gap: "4", padding: "6" });
});

Form with State

import { East, IntegerType, variant } from "@elaraai/east";
import { Stack, Input, Button, Text, State, UIComponentType } from "@elaraai/east-ui";

const counter = East.function([], UIComponentType, $ => {
    $(State.initTyped("count", 0n, IntegerType)());
    const count = $.let($(State.readTyped("count", IntegerType)()));

    return Stack.VStack([
        Text.Root(East.str`Count: ${count.unwrap("some")}`, { fontSize: "lg" }),
        Button.Root("Increment", {
            colorPalette: "blue",
            onClick: (_$) => {
                $(_$.exec(State.writeTyped("count", variant("some", count.unwrap("some").add(1n)), IntegerType)()));
            },
        }),
    ], { gap: "4" });
});

Data Table

import { Table, UIComponentType } from "@elaraai/east-ui";

const dataTable = East.function([], UIComponentType, $ => {
    return Table.Root(
        [
            { id: 1n, name: "Alice", email: "alice@example.com" },
            { id: 2n, name: "Bob", email: "bob@example.com" },
        ],
        [
            { header: "ID", accessorKey: "id" },
            { header: "Name", accessorKey: "name" },
            { header: "Email", accessorKey: "email" },
        ],
        { variant: "line", showColumnBorder: true }
    );
});

Line Chart

import { Chart, UIComponentType } from "@elaraai/east-ui";

const chart = East.function([], UIComponentType, $ => {
    return Chart.Line(
        [
            { month: "Jan", revenue: 186.0, profit: 80.0 },
            { month: "Feb", revenue: 305.0, profit: 120.0 },
            { month: "Mar", revenue: 237.0, profit: 95.0 },
        ],
        { revenue: { color: "teal.solid" }, profit: { color: "purple.solid" } },
        { xAxis: { dataKey: "month" }, showLegend: true, showDots: true }
    );
});

Dialog Overlay

import { Dialog, Button, Text, UIComponentType } from "@elaraai/east-ui";

const dialogExample = East.function([], UIComponentType, $ => {
    return Dialog.Root({
        trigger: Button.Root("Open Dialog"),
        title: "Confirm Action",
        children: [Text.Root("Are you sure you want to proceed?")],
        footer: [
            Button.Root("Cancel", { variant: "outline" }),
            Button.Root("Confirm", { colorPalette: "blue" }),
        ],
    });
});