/**
 * Transform a `.scss` source into CSS-equivalent text that the downstream
 * Lyse pipeline (token extraction, hardcoded-value rules) can consume.
 *
 * CRITICAL invariant: the transform is **line-count preserving**. Output line N
 * corresponds to source line N. Downstream rules report findings by line against
 * this output, and those line numbers must match the original `.scss` source —
 * otherwise findings (and codemod edits, SARIF locations) land on the wrong
 * line. We therefore neutralize SCSS-only constructs *in place* (blanking their
 * source lines) instead of removing AST nodes and re-stringifying, which would
 * collapse lines and shift everything below.
 *
 * The transform is deliberately lossy and minimal:
 * - `$variable: value;` declarations feed a symbol table, then their source
 *   lines are blanked (kept as empty lines).
 * - `#{$variable}` interpolation is resolved against the symbol table. An
 *   unresolved interpolation is left as-is so downstream rules can still surface
 *   "unknown token" findings rather than silently swallowing it.
 * - SCSS-only at-rules (`@include`, `@if`, `@for`, `@function`, `@use`,
 *   `@import`, etc.) have their full source line range blanked.
 * - `@mixin` is special-cased: only its header line (`@mixin name(args) {`) and
 *   closing brace are blanked, so CSS-like declarations in the body (a real
 *   hardcoded-value drift surface) are still scanned. Single-line mixins
 *   collapse to one blanked line as before.
 * - `//` line comments are converted to CSS block comments in place, so a
 *   value inside a comment is not mistaken for a hardcoded-value violation.
 * - Plain rules / nested rules / plain at-rules (`@media`, `@supports`,
 *   `@keyframes`, `@theme`) are kept verbatim.
 *
 * Out of scope for v0.1:
 * - `.sass` indented syntax (postcss-scss does not parse it; the caller keeps
 *   `.sass` flagged as `skipped`).
 * - SCSS functions (`darken()`, `map-get()`, …) — left unresolved.
 * - `@function` / `@include`-content bodies (SCSS logic, not CSS declarations) —
 *   still fully blanked.
 */
export declare function transformScssToCss(source: string): string;