timepiece/node_modules/lit-html/directives/when.d.ts

26 lines
918 B
TypeScript

/**
* @license
* Copyright 2021 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/
/**
* When `condition` is true, returns the result of calling `trueCase()`, else
* returns the result of calling `falseCase()` if `falseCase` is defined.
*
* This is a convenience wrapper around a ternary expression that makes it a
* little nicer to write an inline conditional without an else.
*
* @example
*
* ```ts
* render() {
* return html`
* ${when(this.user, () => html`User: ${this.user.username}`, () => html`Sign In...`)}
* `;
* }
* ```
*/
export declare function when<T, F>(condition: true, trueCase: () => T, falseCase?: () => F): T;
export declare function when<T, F = undefined>(condition: false, trueCase: () => T, falseCase?: () => F): F;
export declare function when<T, F = undefined>(condition: unknown, trueCase: () => T, falseCase?: () => F): T | F;
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