/**
 * Convert a string or string[] into a string[].
 * Multi-line strings are split by \n.
 *
 * D5 deletion semantics: empty content ("" or []) becomes [] — a replace
 * with empty content therefore deletes its target line/range (the splice in
 * applyReplaceSingle/applyReplaceRange spreads zero new lines), while the
 * append/prepend no-op guards (newLines.length === 0) keep "" a no-op there.
 * Pass [""] explicitly to insert a single empty line.
 */
export declare function toNewLines(input: string | string[]): string[];
/**
 * Strip any "LINE#HASH|" prefix from lines if present.
 * The model sometimes includes annotated hashline format in its replacement content.
 *
 * D14: when `refLineCount` (the target file's line count) is provided, a
 * prefix is stripped ONLY if its line number is a real line of that file
 * ([1, refLineCount]) — a look-alike prefix pointing at a line that cannot
 * exist in the file is legitimate user content and survives verbatim.
 * Anchor-validity is decided by LINE RANGE, not hash match: the pipeline
 * feeds the working range to apply* (edit-engine test 18 feeds pseudo-anchor
 * "1#abc|B!" into a 3-line replace and expects the strip), and the hash could
 * belong to a line the model echoed correctly. Direct calls without a ref
 * keep the legacy unconditional strip (the bare unit-test contract).
 */
export declare function stripLinePrefixes(lines: string[], refLineCount?: number): string[];
/**
 * If replacementLine lost its leading indent, restore it from templateLine.
 * Only triggers when:
 *   - templateLine has leading whitespace
 *   - replacementLine has NO leading whitespace (but is non-empty)
 */
export declare function restoreLeadingIndent(templateLine: string, replacementLine: string): string;
/**
 * Strip anchor echo from insert-after operations.
 * The model sometimes echoes the anchor line at the start of the replacement
 * in literal annotated-hashline form ("LINE#HASH|anchor"). D4: strips ONLY
 * when the first new line literally matches the prefix form and its prefixed
 * content equals the anchor line — a bare content line that merely equals the
 * anchor (e.g. consecutive "}") is never stripped.
 */
export declare function stripInsertAnchorEcho(anchorLine: string, newLines: string[]): string[];
/**
 * Strip anchor echo from insert-before (prepend) operations.
 * The model sometimes echoes the anchor line at the end of the replacement
 * in literal annotated-hashline form ("LINE#HASH|anchor"). D4: strips ONLY
 * when the last new line literally matches the prefix form and its prefixed
 * content equals the anchor line — a bare content line that merely equals the
 * anchor is never stripped.
 */
export declare function stripInsertBeforeEcho(anchorLine: string, newLines: string[]): string[];
/**
 * Strip range boundary echo from replace-range operations.
 * The model sometimes includes the boundary lines from the original range
 * in the replacement content in literal annotated-hashline form. D4: strips
 * ONLY when the boundary new line literally matches the prefix form and its
 * prefixed content equals the boundary line — a bare content line that merely
 * equals the boundary (e.g. re-using the old start line as new content) is
 * never stripped.
 *
 * Detects:
 *   - First line of newLines is "LINE#HASH|lines[startLine-1]" → strip from start
 *   - Last line of newLines is "LINE#HASH|lines[endLine-1]" → strip from end
 */
export declare function stripRangeBoundaryEcho(lines: string[], startLine: number, endLine: number, newLines: string[]): string[];
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