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JavaScript
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/**
* @import {Options, State} from 'mdast-util-to-markdown'
*/
/**
* @param {State} state
* @returns {Exclude<Options['emphasis'], null | undefined>}
*/
export function checkEmphasis(state) {
const marker = state.options.emphasis || '*'
if (marker !== '*' && marker !== '_') {
throw new Error(
'Cannot serialize emphasis with `' +
marker +
'` for `options.emphasis`, expected `*`, or `_`'
)
}
return marker
}