/**
 * Sanitize a CSS property *value* before it is written into a style rule.
 *
 * Transformations applied (in order):
 * 1. Strip null bytes (`\u0000`) — can confuse CSS parsers across environments.
 * 2. Truncate at the first `{` or `}` character — prevents rule injection.
 *    Example: `"red}body{background:evil"` → `"red"`.
 * 3. Strip dangerous URL protocols inside `url(...)` — removes `javascript:`,
 *    `vbscript:`, and `data:text/html` (case-insensitive) from url() arguments.
 *    Example: `url("javascript:evil")` → `url("evil")`.
 *
 * Safe values such as `calc(100% - 2px)`, `url("https://…")`,
 * `url(data:image/png;base64,…)`, multi-stop gradients, `var(--x, fallback)`,
 * and semicolons are passed through without modification.
 */
export declare function sanitizeValue(value: string): string;
/**
 * Validate a CSS property *name*.
 *
 * Returns `true` when the name contains only ASCII letters and hyphens, which
 * covers all standard CSS properties (e.g. `color`, `background-color`,
 * `--my-custom-prop`) as well as camelCase variants used by the serializer
 * (e.g. `backgroundColor`, `fontSize`).
 *
 * Returns `false` for anything containing digits, braces, semicolons, colons,
 * or other characters that have no place in a property name — these are skipped
 * with a console warning in the serializer, preventing malformed rules such as
 * `color:red: …` or `font}size: …` from being written into the stylesheet.
 */
export declare function sanitizePropertyName(name: string): boolean;
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