/**
 * On-disk schema of the `flowr-sigdb` database (schema 5): the constants, enums, numeric tuple forms and
 * data interfaces that define the serialized format and its read view. The reader/writer/builder logic that
 * operates on these lives in `./sigdb` (which re-exports this module, so `./sigdb` stays the single entry point).
 */
/** The definition location of the binding, with a file path usually relative to the package project root. */
export interface SigDefinitionLocation {
    readonly file: string;
    readonly line: number;
}
/** The resolved identifiers of a singular package version */
export interface LibraryExports {
    /** R version identifier (see `RVersion.parse`) */
    readonly version: string;
    readonly exported: readonly string[];
    /** defined-but-not-exported identifiers (only available when internal names are stored, which we usually avoid in the db) */
    readonly internal: readonly string[];
    readonly deprecated: readonly string[];
    /**
     * S3 classes this package version OWNS: it registers at least one S3 method for the class (its NAMESPACE's
     * `S3method(generic, class)`) AND exports a same-named constructor function. See {@link FnProp.S3Owner}.
     */
    readonly s3Classes: readonly string[];
    /** S4 classes this package version OWNS: it exports the class via its NAMESPACE `exportClasses()`. See {@link FnProp.S4Owner}. */
    readonly s4Classes: readonly string[];
    /** flag indicating whether this is a package available on CRAN */
    readonly cran: boolean;
    /** package documentation url base in case this package is found at a different endpoint */
    readonly cranUrl?: string;
    /** definition location per identifier, if the database carries them */
    readonly locations?: ReadonlyMap<string, SigDefinitionLocation>;
}
export declare const SigDbMagic = "flowr-sigdb";
export declare const SigDbSchema = 5;
/** default CRAN source-package base URL, used to build a version's tarball link */
export declare const DefaultCranBase = "https://cran.r-project.org/src/contrib/";
/**
 * Parameter default expressions longer than this are stored truncated (with a `…` marker): flowR only needs a
 * short lexeme preview of a default, not the whole expression, so a small cap keeps the dictionary compact.
 */
export declare const MaxDefaultLength = 10;
/** file extension of the (uncompressed) bundle */
export declare const SigDbExt = ".sigs.ndjson";
/** function-level boolean properties, packed into {@link SigFn}'s bitfield */
export declare const enum FnProp {
    Exported = 1,
    HigherOrder = 2,
    Recursive = 4,
    CallsDeprecated = 8,
    CanThrow = 16,
    Deprecated = 32,
    CallsInternal = 64,
    NonDeterministic = 128,
    NoDoc = 256,
    S3Method = 512,
    /**
     * An exported function that is also an S3 class this package OWNS: it is a same-named constructor for a
     * class the package registers at least one S3 method for (see {@link LibraryExports.s3Classes}, derived
     * from this bit by {@link deriveLibraryExports}).
     */
    S3Owner = 1024,
    /**
     * Set on the name of an S4 class this package OWNS: it exports the class via its NAMESPACE `exportClasses()`
     * (see {@link LibraryExports.s4Classes}, derived from this bit by {@link deriveLibraryExports}).
     */
    S4Owner = 2048
}
/** the {@link FnProp} bit to its name (for decoding); integer keys iterate in ascending bit order */
export declare const FnPropNames: Readonly<Record<FnProp, string>>;
/** parameter flags, packed into {@link SigParam}'s flag int */
export declare const enum ParamFlag {
    /** forced: the argument is always evaluated (crawlr `always-read`) */
    Forced = 1,
    /** the argument has no default value (crawlr `missing`) */
    Missing = 2
}
/**
 * One parameter of a signature (position implied by array order): just `nameIdx`, or `[nameIdx, flags]`,
 * or `[nameIdx, flags, defaultIdx]`. All indices point into the global string dictionary.
 */
export type SigParam = number | [nameIdx: number, flags: number] | [nameIdx: number, flags: number, defaultIdx: number];
/** a full signature: the ordered parameter list */
export type Sig = SigParam[];
/**
 * One function record `[nameIdx, sigIdx, cgIdx, propBits, fileIdx, line]` (`sigIdx`/`cgIdx`/`fileIdx` are -1 when
 * absent), with an optional trailing `topicIdx` (the Rd help topic, present only when it differs from the name).
 * The trailing element is additive: readers that stop at `line` ignore it, so older bundles stay readable.
 */
export type SigFn = [nameIdx: number, sigIdx: number, cgIdx: number, propBits: number, fileIdx: number, line: number] | [nameIdx: number, sigIdx: number, cgIdx: number, propBits: number, fileIdx: number, line: number, topicIdx: number];
/** the kind of a package dependency (mirrors the DESCRIPTION fields) */
export declare const enum DepType {
    Depends = 0,
    Imports = 1,
    LinkingTo = 2,
    Suggests = 3,
    Enhances = 4
}
/** the {@link DepType} values in order, with their names (for decoding) */
export declare const DepTypeNames: readonly ["depends", "imports", "linkingTo", "suggests", "enhances"];
/** one dependency: `[nameIdx, type]` or `[nameIdx, type, constraintIdx]` (indices into the global dictionary) */
export type SigDep = [nameIdx: number, type: DepType] | [nameIdx: number, type: DepType, constraintIdx: number];
/**
 * A self-contained package. A `versions[ver]` entry is a **delta-encoded** ascending list of indices into
 * {@link PkgBlob.fns} (cumulative-sum to decode); its long runs of `1` just mean a version's functions sit in
 * consecutive pool slots, which brotli collapses on disk. See {@link PkgBlobTuple} for the on-disk order.
 */
export interface PkgBlob {
    sigs: Sig[];
    cgs: number[][];
    fns: SigFn[];
    /** version name to a delta-encoded ascending list of indices into {@link PkgBlob.fns} */
    versions: Record<string, number[]>;
    /** the subset of {@link PkgBlob.versions} that are not from CRAN (usually empty, so left undefined in memory) */
    noncran?: string[];
    /** pool of unique dependency lists (shared across a package's versions) */
    deps: SigDep[][];
    /** version name to an index into {@link PkgBlob.deps} (absent when the version declares no dependencies) */
    depsByVersion: Record<string, number>;
    /** version name to its release date as **days since the Unix epoch** (absent when the date is unknown) */
    dates: Record<string, number>;
}
/** on-disk tuple form of a {@link PkgBlob}: `[sigs, cgs, fns, versions, noncran, deps, depsByVersion, dates]` */
export type PkgBlobTuple = [Sig[], number[][], SigFn[], Record<string, number[]>, string[], SigDep[][], Record<string, number>, Record<string, number>?];
/**
 * Per-package metadata. The optional 4th element marks an **R-core / base package** (`base`, `stats`,
 * `parallel`, the historical `mva`/`nls`/…): for these the version keys are the R releases during which
 * the package shipped with core R, so the set of versions is exactly the R versions it was part of core.
 */
export type SigDbPkgMeta = [latest: string, archived: number, downloads: number, core?: number];
/**
 * Temporal tier of a bundle's packages:
 * - `current` -- only each package's latest version.
 * - `full`    -- every version (self-contained history).
 * - `history` -- every version EXCEPT the latest. This is the delta a `current` bundle already carries, so a
 *                `history` bundle mounts beside a `current`/slim one to add the older versions with no duplicate
 */
export type SigDbTier = 'full' | 'current' | 'history';
/** popularity shard: `top` keeps the most-downloaded packages, `rest` the remainder (undefined = all) */
export type SigDbShard = 'top' | 'rest';
export interface SigDbContent {
    readonly version: number;
    readonly date: string;
    readonly generated: number;
    /** temporal tier of this bundle */
    readonly tier: SigDbTier;
    /** popularity shard, when the bundle was split by download rank */
    readonly shard?: SigDbShard;
    /** the download-rank cutoff used for {@link SigDbContent.shard} */
    readonly topN?: number;
    /** which information this bundle stores */
    readonly features?: Required<SigDbFeatures>;
    readonly packages: number;
    readonly versions: number;
    readonly functions: number;
    readonly uniquePackages: number;
    readonly strings: number;
    readonly hash: string;
}
export interface SigDb {
    format: typeof SigDbMagic;
    schema: typeof SigDbSchema;
    scope: 'signatures';
    content: SigDbContent;
    cranBase?: string;
    /** global string dictionary */
    strings: string[];
    /** unique per-package blobs */
    blobs: PkgBlob[];
    /** package name to its index into {@link SigDb.blobs} */
    pkgs: Record<string, number>;
    /** package name to its {@link SigDbPkgMeta} */
    meta: Record<string, SigDbPkgMeta>;
}
export interface SigParamInfo {
    readonly name: string;
    readonly forced?: boolean;
    /** the argument has no default value */
    readonly missing?: boolean;
    readonly default?: string;
}
export interface SigFunctionInfo {
    readonly name: string;
    /** bitfield of {@link FnProp} (must set {@link FnProp.Exported} for exported functions) */
    readonly props: number;
    readonly params: readonly SigParamInfo[];
    /** named callees (order/duplication irrelevant; deduped + sorted internally) */
    readonly callees: readonly string[];
    readonly file?: string;
    readonly line?: number;
    /** the Rd help topic (man-page name) documenting this function, when it differs from {@link name} */
    readonly topic?: string;
}
/** one declared package dependency, e.g. `{ name: 'testthat', type: Suggests, constraint: '>= 2.1.0' }` */
export interface SigDependencyInfo {
    readonly name: string;
    readonly type: DepType;
    /** the version qualifier as written in DESCRIPTION, e.g. `>= 3.0.0` (absent = any version) */
    readonly constraint?: string;
}
export interface SigVersionInfo {
    readonly cran: boolean;
    readonly functions: readonly SigFunctionInfo[];
    /** declared dependencies of this version (Depends/Imports/LinkingTo/Suggests/Enhances) */
    readonly dependencies?: readonly SigDependencyInfo[];
    /** release date as milliseconds since the Unix epoch (stored at day granularity, used to find the newest release) */
    readonly date?: number;
}
/**
 * Which information to store in a bundle (default: everything). Turning a feature off shrinks the
 * database -- e.g. an exports-and-dependencies-only bundle omits the (largest) call graphs and signatures.
 * The export view (exported/internal/deprecated) is always available.
 */
export interface SigDbFeatures {
    /** parameter lists (names, forced/optional, defaults) -- default true */
    signatures?: boolean;
    /** per-function call graphs (named callees) -- default true */
    callGraphs?: boolean;
    /** definition locations (file + line) -- default true */
    locations?: boolean;
    /** per-version declared dependencies -- default true */
    dependencies?: boolean;
}