/var/lang/lib/node_modules/npm/node_modules/@npmcli/config/lib
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// replace any ${ENV} values with the appropriate environ.// optional "?" modifier can be used like this: ${ENV?} so in case of the variable being not defined, it evaluates into empty string. const envExpr = /(?<!\\)(\\*)\$\{([^${}?]+)(\?)?\}/g module.exports = (f, env) => f.replace(envExpr, (orig, esc, name, modifier) => { const fallback = modifier === '?' ? '' : `$\{${name}}` const val = env[name] !== undefined ? env[name] : fallback // consume the escape chars that are relevant. if (esc.length % 2) { return orig.slice((esc.length + 1) / 2) } return (esc.slice(esc.length / 2)) + val})