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