Template literal for multiline regex with comments

regex-template-literal.js

/**
 * Simple custom template literal that removes comments and whitespace in regex
 */
const regex = ({ raw }, ...substitutions) =>
    new RegExp(
        String.raw(
            { raw: raw.map(v => v.replace(/\s+#.*$/gm, '').replace(/[\s\r\n]+/g, '')) },
            ...substitutions,
        ),
    );

/**
 * Example: detect import syntax in text
 */
const detectImport = filename => 
    regex`
        import
        [\s\r\n]+                       # whitespace (possibly newline)
        (?:                             # optional uncaptured
            ([\w$]+)                    # capture $1: default import
            [\s\r\n]*                   # optional whitespace (possibly newline)
        )?
        (?:                             # optional uncaptured
            ,
            [\s\r\n]*                   # optional whitespace (possibly newline)
        )?                              
        (?:                             # optional uncaptured
            {
            ([^}]*)                     # capture $2: named imports text (anything but closing brace)
            }
            [\s\r\n]*                   # optional whitespace (possibly newline)
        )?
        from
        [\s\r\n]+                       # whitespace (possibly newline)
        '[^']+/${filename}(?:\.js)?'    # single quoted module specifier ending in given filename
        `,