import { TemplateResult } from '../processor/template-result';
/**
 * Conditional rendering directive.
 *
 * Renders `trueCase` when condition is truthy, `falseCase` when falsy.
 * Unlike ternary expressions, template functions are only called for the
 * active branch — the inactive branch is never evaluated.
 *
 * Usage:
 * ```ts
 * html`
 *   ${when(this.isLoggedIn,
 *     () => html`<user-profile .user="${this.user}"></user-profile>`,
 *     () => html`<login-form></login-form>`
 *   )}
 * `
 * ```
 *
 * @param condition - Truthy/falsy value to test
 * @param trueCase - Template function called when condition is truthy
 * @param falseCase - Optional template function called when condition is falsy
 */
export declare function when<T extends TemplateResult>(condition: unknown, trueCase: () => T, falseCase?: () => T): T | undefined;
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