/**
 * How alike two blobs are, 0 to 100, matching dulwich's own score.
 *
 * The two implementations have to agree digit for digit or rename detection
 * diverges between the languages at the 60% threshold: a move-plus-edit would
 * read as one rename on one side and as an add beside a delete on the other.
 *
 * Two empty blobs are perfectly alike, which is the one case a ratio cannot
 * express.
 */
export declare function similarityScore(a: Uint8Array, b: Uint8Array): number;
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