/** The AVCS scope a working tree writes into. Empty ⇒ the base view (no tag at all). */
export type BranchScope = {
    line?: string;
    workspace?: string;
};
/**
 * Map a git branch to an AVCS scope (docs/20 §3.2). A topic branch is work that intends to
 * CONVERGE, so it becomes a workspace; a line is permanent divergence and is only ever
 * chosen deliberately.
 *
 *   explicit `--line`         → { line }        a human asking to diverge
 *   detached HEAD / no git    → { }             the base view, untagged
 *   a branch with a line ref  → { line }        pre-existing work keeps its history (W9)
 *   trunk                     → { }             the base view, untagged
 *   anything else             → { workspace }   a converging topic branch
 *
 * `hasExistingLine` is the caller's answer to "is there already a `line:<branch>` ref?".
 * Remapping such a branch to a workspace would leave its captured history unreachable from
 * the view it has been accumulating in, so the old mapping wins for as long as it exists.
 * It is checked BEFORE trunk on purpose: in a repository from before `trunk` existed, a trunk
 * named anything but main/master had itself become a line, and its accumulated work lives in
 * that line's view — sending new captures to the default view would split the history in two.
 */
export declare function scopeForBranch(branch: string | null | undefined, trunks: Iterable<string>, opts?: {
    explicitLine?: string;
    hasExistingLine?: boolean;
}): BranchScope;
/**
 * The single branch a completed git merge brought in, read off git's own reflog subject, or
 * `null` when it cannot be read off unambiguously (docs/20 §3.4).
 *
 * `post-merge` receives no arguments and runs after `MERGE_HEAD` is gone, so the reflog is
 * the only record of what was merged. Landing is append-only and irreversible, so anything
 * short of one unmistakable branch name returns null and the caller must land NOTHING
 * (docs/20 R1): an octopus merge names several, a squash merge (R2) names none at all.
 */
export declare function mergedBranchFromReflog(subject: string | null | undefined): string | null;
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