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- /**
- * @typedef {import('../types.js').Options} Options
- * @typedef {import('../types.js').State} State
- */
- /**
- * @param {State} state
- * @returns {Exclude<Options['rule'], null | undefined>}
- */
- export function checkRule(state) {
- const marker = state.options.rule || '*'
- if (marker !== '*' && marker !== '-' && marker !== '_') {
- throw new Error(
- 'Cannot serialize rules with `' +
- marker +
- '` for `options.rule`, expected `*`, `-`, or `_`'
- )
- }
- return marker
- }
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