export declare enum NodeLockfileVersion {
    NpmLockV1 = "NPM_LOCK_V1",
    NpmLockV2 = "NPM_LOCK_V2",
    NpmLockV3 = "NPM_LOCK_V3",
    YarnLockV1 = "YARN_LOCK_V1",
    YarnLockV2 = "YARN_LOCK_V2",
    PnpmLockV5 = "PNPM_LOCK_V5",
    PnpmLockV6 = "PNPM_LOCK_V6",
    PnpmLockV9 = "PNPM_LOCK_V9"
}
export declare const getLockfileVersionFromFile: (targetFile: string) => NodeLockfileVersion;
export declare function getPnpmLockfileVersion(lockFileContents: string): NodeLockfileVersion.PnpmLockV5 | NodeLockfileVersion.PnpmLockV6 | NodeLockfileVersion.PnpmLockV9;
export declare function getYarnLockfileVersion(lockFileContents: string): NodeLockfileVersion.YarnLockV1 | NodeLockfileVersion.YarnLockV2;
export declare function getNpmLockfileVersion(lockFileContents: string): NodeLockfileVersion.NpmLockV1 | NodeLockfileVersion.NpmLockV2 | NodeLockfileVersion.NpmLockV3;
/**
 * Parse JSON from a manifest or lockfile. On failure throws an
 * InvalidUserInputError that preserves the underlying parser message
 * (including the position of the syntax error) and appends a best-effort hint
 * about the likely cause.
 *
 * `fileLabel` is the file kind shown in the error, e.g. 'package.json' or
 * 'package-lock.json'.
 */
export declare function parseJsonFile<T = any>(content: string, fileLabel: string): T;
/**
 * Best-effort, allocation-light hint describing the most likely reason a JSON
 * parse failed. Inspects only the leading characters of the content, never
 * throws, and returns '' when nothing recognisable is found - so it is always
 * safe to append to a parse-error message.
 */
export declare function describeLikelyJsonCause(content: string): string;