import { FxError } from "@microsoft/teamsfx-api";
import { Result } from "neverthrow";
import { BundledFloor, TagEntry, TemplateSource, TemplateSourcePort } from "./templateSource";
/** v4 channel prefix and naming (ADR-0006 channel isolation). */
export declare const V4_TAG_PREFIX = "templates-v4@";
export declare const ZIP_EXT = ".zip";
export interface TemplateChannelConfig {
    /** NDJSON tag-list URL for the v4 channel (separate from the frozen v3 `tagListURL`). */
    templatesV4TagListURL: string;
    /** Base URL release assets are downloaded from. */
    templateDownloadBaseURL: string;
    /** Network retry budget. */
    tryLimits: number;
}
/** Parse the NDJSON tag list; malformed nonblank lines are hard errors. */
export declare function parseTagList(ndjson: string): TagEntry[];
/** The download URL for a v4 template package version. */
export declare function templateZipUrl(baseURL: string, version: string): string;
/** The on-disk cache directory for the v4 template packages. */
export declare function cacheDir(): string;
/** The cache file path for one version. */
export declare function cacheFile(version: string): string;
/** Build the production port; the bundled floor is injected. */
export declare function createTemplateSourcePort(config: TemplateChannelConfig, floor: BundledFloor): TemplateSourcePort;
/** Load bytes for an already-resolved source; never re-download here. */
export declare function loadResolvedPackage(source: TemplateSource, port: TemplateSourcePort): Result<Buffer, FxError>;
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