/*!
 * Copyright (c) Microsoft Corporation and contributors. All rights reserved.
 * Licensed under the MIT License.
 */
import type { IFluidCompatibilityMetadata, Logger, Package } from "@fluidframework/build-tools";
import { PackageCommand } from "../../BasePackageCommand.js";
import type { PackageSelectionDefault } from "../../flags.js";
export declare const daysInMonthApproximation = 33;
export default class UpdateGenerationCommand extends PackageCommand<typeof UpdateGenerationCommand> {
    static readonly description = "Updates the generation and release date for layer compatibility.";
    static readonly flags: {
        readonly private: import("@oclif/core/interfaces").BooleanFlag<boolean>;
        readonly scope: import("@oclif/core/interfaces").OptionFlag<string[] | undefined, import("@oclif/core/interfaces").CustomOptions>;
        readonly skipScope: import("@oclif/core/interfaces").OptionFlag<string[] | undefined, import("@oclif/core/interfaces").CustomOptions>;
        readonly all: import("@oclif/core/interfaces").BooleanFlag<boolean>;
        readonly dir: import("@oclif/core/interfaces").OptionFlag<string[] | undefined, import("@oclif/core/interfaces").CustomOptions>;
        readonly packages: import("@oclif/core/interfaces").BooleanFlag<boolean>;
        readonly releaseGroup: import("@oclif/core/interfaces").OptionFlag<("client" | "server" | "build-tools" | "all" | "gitrest" | "historian")[] | undefined, import("@oclif/core/interfaces").CustomOptions>;
        readonly releaseGroupRoot: import("@oclif/core/interfaces").OptionFlag<("client" | "server" | "build-tools" | "all" | "gitrest" | "historian")[] | undefined, import("@oclif/core/interfaces").CustomOptions>;
        readonly changed: import("@oclif/core/interfaces").BooleanFlag<boolean>;
        readonly branch: import("@oclif/core/interfaces").OptionFlag<string, import("@oclif/core/interfaces").CustomOptions>;
        readonly concurrency: import("@oclif/core/interfaces").OptionFlag<number, import("@oclif/core/interfaces").CustomOptions>;
        readonly generationDir: import("@oclif/core/interfaces").OptionFlag<string, import("@oclif/core/interfaces").CustomOptions>;
        readonly outFile: import("@oclif/core/interfaces").OptionFlag<string, import("@oclif/core/interfaces").CustomOptions>;
        readonly minimumCompatWindowMonths: import("@oclif/core/interfaces").OptionFlag<number, import("@oclif/core/interfaces").CustomOptions>;
    };
    protected defaultSelection: PackageSelectionDefault;
    protected processPackage(pkg: Package): Promise<void>;
}
/**
 * Determines if the current package version represents a patch release.
 *
 * @param pkgVersion - The semantic version of the package (e.g., "2.0.1")
 * @returns True if the version is a patch release, false otherwise
 *
 * @throws Error When the provided version string is not a valid semantic version
 *
 * @example
 * ```typescript
 * isCurrentPackageVersionPatch("2.0.1"); // returns true
 * isCurrentPackageVersionPatch("2.1.0"); // returns false
 * isCurrentPackageVersionPatch("3.0.0"); // returns false
 * ```
 */
export declare function isCurrentPackageVersionPatch(pkgVersion: string): boolean;
/**
 * Generates the complete content for a layer generation TypeScript file.
 *
 * Creates a properly formatted TypeScript file with copyright header, autogenerated warning,
 * and export for generation number.
 *
 * @param generation - The layer compatibility generation number
 * @returns The complete file content as a string ready to be written to disk
 *
 * @example
 * ```typescript
 * const content = generateLayerFileContent(5);
 * // Returns a complete TypeScript file with exports:
 * // export const generation = 5;
 * ```
 */
export declare function generateLayerFileContent(generation: number): string;
/**
 * Determines if a new generation should be generated based on package version changes and time since
 * the last release.
 *
 * This function parses an existing layer generation file and decides whether to increment the generation
 * number based on:
 * 1. Whether the package version has changed since the last update
 * 2. How much time has elapsed since the previous release date
 * 3. The minimum compatibility window constraints
 *
 * The generation increment is calculated as the number of months since the previous release,
 * but capped at (minimumCompatWindowMonths - 1) to maintain compatibility requirements.
 *
 * @param currentPkgVersion - The current package version to compare against the stored version
 * @param fluidCompatMetadata - The existing Fluid compatibility metadata from the previous generation
 * @param minimumCompatWindowMonths - The maximum number of months of compatibility to maintain across layers
 * @param log - Logger instance for verbose output about the calculation process
 * @returns The new generation number if an update is needed, or undefined if no update is required
 *
 * @throws Error When the generation file content doesn't match the expected format
 * @throws Error When the current date is older than the previous release date
 */
export declare function maybeGetNewGeneration(currentPkgVersion: string, fluidCompatMetadata: IFluidCompatibilityMetadata, minimumCompatWindowMonths: number, log: Logger): number | undefined;
//# sourceMappingURL=layerCompatGeneration.d.ts.map