wikijs-fork/server/modules/rendering/markdown-core/underline.js

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const renderEm = (tokens, idx, opts, env, slf) => {
const token = tokens[idx];
if (token.markup === '_') {
token.tag = 'u';
}
return slf.renderToken(tokens, idx, opts);
}
module.exports = (md) => {
md.renderer.rules.em_open = renderEm;
md.renderer.rules.em_close = renderEm;
}