import { nothing, type TemplateResult } from "lit-html";
/**
 * A `[condition, template]` tuple — the condition is evaluated and when
 * `true` its template is returned by {@link renderSwitch}.
 */
export type SwitchEntry = readonly [
    condition: boolean,
    template: TemplateResult
];
/**
 * One item in the array passed to {@link renderSwitch}.
 *
 * Either:
 * - `[condition, template]` — a conditional branch.
 * - `TemplateResult`        — an unconditional fallback (typically placed last).
 */
export type SwitchCase = SwitchEntry | TemplateResult;
/**
 * `renderSwitch` — return the template for the first truthy branch.
 *
 * Iterates `cases` in order:
 * - **`[condition, template]`** — if `condition` is truthy, `template` is returned.
 * - **`TemplateResult`** — returned unconditionally (acts as a default / fallback).
 *
 * If no branch matches and there is no fallback, `nothing` is returned so the
 * call site produces no DOM output.
 *
 * TypeScript narrows each element to either `SwitchEntry` (a 2-tuple) or
 * `TemplateResult` — both can be inferred without explicit type annotations at
 * the call site.
 *
 * @example
 * ```ts
 * // Three tabs + a fallback shown when no tab is active
 * html`${renderSwitch([
 *   [tab === "home",     html`<home-panel></home-panel>`],
 *   [tab === "settings", html`<settings-panel></settings-panel>`],
 *   [tab === "profile",  html`<profile-panel></profile-panel>`],
 *   html`<p>Select a tab to get started.</p>`,   // ← default
 * ])}`
 *
 * // Without a default — returns nothing when no condition is met
 * html`${renderSwitch([
 *   [isAdmin,  html`<admin-tools></admin-tools>`],
 *   [isEditor, html`<editor-bar></editor-bar>`],
 * ])}`
 * ```
 *
 * @param cases  Ordered list of `[condition, template]` entries and/or a
 *               plain `TemplateResult` default.
 * @returns      The first matching `TemplateResult`, or `nothing` when
 *               no branch matches.
 */
export declare function renderSwitch(cases: readonly SwitchCase[]): TemplateResult | typeof nothing;
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