export interface WriteCollisionInput {
    /** Absolute path the plugin wants to write to. */
    targetPath: string;
    /**
     * Current contents of the file at `targetPath`, or `null` if the file
     * does not exist. The caller is responsible for the actual `readFile`
     * — we deliberately keep this function pure.
     */
    existingContents: string | null;
    /**
     * Set of absolute paths the plugin has already emitted during the
     * current build/dev session. If the target path is in this set, we're
     * updating our own output (subsequent compile of the same target after
     * a cache miss/eviction) and overwriting is safe.
     */
    emittedThisRun: Set<string>;
}
/**
 * Decide whether writing to `targetPath` is safe.
 *
 * Returns the literal string `'write'` when safe — chosen over a boolean
 * so the call site reads naturally (`if (checkWriteCollision(...) ===
 * 'write') { ... }`). Throws otherwise.
 */
export declare function checkWriteCollision(input: WriteCollisionInput): 'write';
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