/**
 * DOT syntax helpers
 *
 * Two small pieces that exist because a generated DOT that nobody parses is a DOT that WILL break:
 *
 * 1. `dotValue()` — the ONE place a runtime value (service name, api name, project name, title)
 *    becomes safe to interpolate into a quoted DOT string. Inlining values at each call site is how
 *    an unescaped `"` shipped and took the whole diagram down: in DOT a bare `"` TERMINATES the
 *    string it appears in, so one bad node line makes the entire graph fail to parse.
 * 2. `assertValidDot()` — a structural check on the emitted DOT that turns exactly that class of
 *    mistake into a thrown error at generation time, instead of a blank page with a Graphviz
 *    "syntax error in line N" that only a human opening the HTML ever sees.
 */
/**
 * Escape a runtime value for use INSIDE a quoted DOT string.
 *
 * Only `\` and `"` matter: everything else (parens, spaces, `-`, `#`, unicode) is ordinary text once
 * it is inside quotes. Note this deliberately escapes `\` FIRST, so a value containing a backslash
 * cannot smuggle an escape sequence in. Callers compose label lines with a literal `\\n` AFTER
 * escaping their values — the separator is ours, the value is theirs.
 */
export declare function dotValue(value: string): string;
/**
 * Escape a runtime value for a `record`/`Mrecord` label, on TOP of {@link dotValue}.
 *
 * A record label is not ordinary label text: `|` splits fields, `{}` toggles the layout direction
 * and `<>` delimit port names. A queue name carrying any of them would not merely look wrong — it
 * would restructure the node, splitting one queue box into two or rotating it. Graphviz's record
 * grammar escapes those with a backslash, and since {@link dotValue} has already doubled real
 * backslashes, the `\\` emitted here survives into the record parser as a single one.
 *
 * Leading and trailing spaces are also dropped by the record parser, which is exactly why the
 * horizontal-cylinder queue node uses a `" |"` prefix — that empty first field is deliberate.
 */
export declare function recordValue(value: string): string;
/** Thrown when the generator produces DOT that Graphviz could not parse. */
export declare class InvalidDotError extends Error {
    constructor(message: string);
}
/**
 * Fail loudly on structurally broken DOT.
 *
 * This is not a full Graphviz parser — it is the check that catches the failure mode a string
 * builder actually has: a quote that ends a string early (or never ends it). It scans the quoted
 * strings honouring `\"` escapes and asserts each one is terminated and is bounded by DOT
 * punctuation rather than by bare text. An unescaped `"` inside a label always violates that: the
 * string ends mid-label, and the remaining label text becomes stray tokens.
 */
export declare function assertValidDot(dot: string, source: string): void;