/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.dev/license
 */
/**
 * The character used to mark the start and end of a "block" in a `$localize` tagged string.
 * A block can indicate metadata about the message or specify a name of a placeholder for a
 * substitution expressions.
 *
 * For example:
 *
 * ```ts
 * $localize`Hello, ${title}:title:!`;
 * $localize`:meaning|description@@id:source message text`;
 * ```
 */
export declare const BLOCK_MARKER = ":";
/**
 * The marker used to separate a message's "meaning" from its "description" in a metadata block.
 *
 * For example:
 *
 * ```ts
 * $localize `:correct|Indicates that the user got the answer correct: Right!`;
 * $localize `:movement|Button label for moving to the right: Right!`;
 * ```
 */
export declare const MEANING_SEPARATOR = "|";
/**
 * The marker used to separate a message's custom "id" from its "description" in a metadata block.
 *
 * For example:
 *
 * ```ts
 * $localize `:A welcome message on the home page@@myApp-homepage-welcome: Welcome!`;
 * ```
 */
export declare const ID_SEPARATOR = "@@";
/**
 * The marker used to separate legacy message ids from the rest of a metadata block.
 *
 * For example:
 *
 * ```ts
 * $localize `:@@custom-id␟2df64767cd895a8fabe3e18b94b5b6b6f9e2e3f0: Welcome!`;
 * ```
 *
 * Note that this character is the "symbol for the unit separator" (␟) not the "unit separator
 * character" itself, since that has no visual representation. See https://graphemica.com/%E2%90%9F.
 *
 * Here is some background for the original "unit separator character":
 * https://stackoverflow.com/questions/8695118/whats-the-file-group-record-unit-separator-control-characters-and-its-usage
 */
export declare const LEGACY_ID_INDICATOR = "\u241F";