SizeProvider

One size scale for everything with a height: sm, md and lg are the control heights (32, 44 and 60px at default density), so a button, a field and a select of the same size line up in a row. Wrap a toolbar, a filter bar or a card footer in SizeProvider and every control inside takes that size; a size passed to a control wins. Controls read it with useControlSize.

Feel Controls that sit in a row line up, because a size means one height everywhere.

Or let the agent fetch it: get_component("size") on the Echo MCP server.

Installation

npx echo-ui-cli add size

First time? Run npx echo-ui-cli init once — it sets the project up, and add refuses to run before it.

At a glance

Version: 0.3.0
Weight: 196 B (minified and gzipped; React not counted)

Usage

tsx

import { SizeProvider } from "@/echo/size";

<SizeProvider size="sm">{toolbar}</SizeProvider>

Composition

SizeProvider → context read by every sized control

Examples

A dense toolbar

Every control inside is sm without saying so.

tsx

<SizeProvider size="sm">
  <Field aria-label="Search" placeholder="Search" />
  <HardwareButton>Filter</HardwareButton>
</SizeProvider>

A field and its button

The same size is the same height.

tsx

<Field label="Invite" placeholder="name@example.com" />
<HardwareButton>Send</HardwareButton>

Accessibility

Adds no element and no role.
sm is 32px, above the 24px minimum target; on a touch screen sm buttons grow to a 44px target.

Tested against WCAG 2.2 AA on every release:

axe — No axe violations, in the component's own gallery and on its page.
keyboard — Every action is reachable and operable from the keyboard alone.
focus-visible — Focus is visible on every focusable part, in normal and forced-colors mode.
forced-colors — State stays visible when the look's colours are replaced by the system's.
target-size — Every target's real hit area is at least 24×24px, at every density.
reflow — Content reflows into 320px and survives a doubled text size.

Not covered: screen-reader: not yet verified by a person. Everything above is a machine check; a person has not yet driven this component with a screen reader.

Props

SizeProvider props
Prop	Type	Default
`size` requiredThe size every control inside takes, unless it's given its own.	`"sm" \| "md" \| "lg"`
`children`	`unknown`

Anti-patterns

Never use size for global density: that's the density setting, which scales every step.
Never make the one action a screen is built around sm: give it lg.

Changelog

v0.3.0 · 2026-10-12 · ChangedEvery item needs echo-ui-core 0.3.0 (all components). The drawn device, readability past AA and the design tests live in core, and the components that use them are built against it, so each item now declares echo-ui-core >=0.3.0 <0.4.0. Update core with the items: npm install echo-ui-core@^0.3.0 (or your package manager's), then npx echo-ui-cli update. An item whose files didn't change is the same code under a new version; the 0.2.0 files stay published.
v0.2.0 · 2026-10-04 · AddedOne size on everything with a height. Field, Select, NumberField, OtpField and Segmented take size="sm" | "md" | "lg" (32, 44 or 60px), matching HardwareButton, and all of them read a SizeProvider around them. md is exactly what they were. Avatar gains xs (inline with a line of text) and xl (a profile header).
v0.2.0 · 2026-10-04 · ChangedComments only, no behaviour change. Comments in the component source used to cite documents, milestones and ticket numbers from Echo's own planning, none of which exist in your project. The citations are gone and the sentences around them stay. Where a comment was only a citation, it now says what it meant. Three development warnings (HardwareButton's engraved/caption checks and StatusDot's missing-label check) also dropped the ticket code at the end of the message. echo-ui diff will show changes in most items; none of them are to code.
v0.2.0 · 2026-10-04 · ChangedAn item's version is now a function of declared data, not of how the changelog is formatted. The version an item ships under is published once and never rewritten, and it used to be inferred from prose: a regex for a bolded "Breaking" run across the whole unreleased section, and attribution by "does a bullet mention this name in backticks". One breaking entry therefore moved every item that changed that cycle, and an entry explaining that "Menu and Sheet are unchanged here" filed itself as a change to Menu and Sheet — which it really had.
v0.2.0 · 2026-10-04 · ChangedThe agent brief says Echo has not shipped. llms.txt and the MCP server's instructions led with npx echo-ui-cli init, and that name on npm is a reserved stub with no executable — so a model following the brief wrote an install step that fails with npx's own error. The brief now opens with the caveat, and the docs carry it on every surface that shows a command. One switch (CLI_RELEASED) silences all of them at launch, and a test refuses to let one move without the others. Affects all components only in what the brief says about installing them; no item's props, CSS or rendered semantics change.
v0.2.0 · 2026-10-04 · ChangedEcho's home is echo-ui.com. The registry, the docs and the packages all move to it from echo.nawwara.studio. Nothing was published under the old host, so no echo.json anywhere points at it and there is nothing to migrate — this is the last release where that is true.
v0.2.0 · 2026-10-04 · ChangedWeights, line heights, letter-spacing, z-index, border widths and icon sizes come from the theme scales in all components, with the old value as a fallback, so components keep working with echo-ui-core@0.0.1. Strays moved to the nearest step: most by under a pixel; HardwareButton icons are 14/16/20px (were 15/17/19).
v0.2.0 · 2026-10-04 · FixedContent now reflows into a 320px screen (400% zoom) and survives a doubled browser text size (WCAG 1.4.10, 1.4.4), across all components. Select's 180px floor, NumberField's readout, Segmented and Steps as flex items, EmptyState's grid columns, and Avatar's fixed-pixel disc all gave way; Panel counts its padding inside a width you set (box-sizing: border-box), so a <Panel style={{ width: 220 }}> is now 220px wide overall rather than 260px.

Preview