function parseWhiteList(files) {
    if (!files || !Array.isArray(files)) {
        return null
    }

    const ig = ignore()
    const igN = ignore()
    let hasN = false

    for (const file of files) {
        if (typeof file === "string" && file) {
            const body = file.replace(SLASH_AT_BEGIN_AND_END, "")
            if (file.startsWith("!")) {
                igN.add(`${body}`)
                igN.add(`${body}/**`)
                hasN = true
            } else {
                ig.add(`/${body}`)
                ig.add(`/${body}/**`)
            }
        }
    }

    return hasN
        ? or(ig.createFilter(), not(igN.createFilter()))
        : ig.createFilter()
}
function parseWhiteList(files) {
    if (!files || !Array.isArray(files)) {
        return null
    }

    const ig = ignore()
    const igN = ignore()
    let hasN = false

    for (const file of files) {
        if (typeof file === "string" && file) {
            const body = file.replace(SLASH_AT_BEGIN_AND_END, "")
            if (file.startsWith("!")) {
                igN.add(`${body}`)
                igN.add(`${body}/**`)
                hasN = true
            } else {
                ig.add(`/${body}`)
                ig.add(`/${body}/**`)
            }
        }
    }

    return hasN
        ? or(ig.createFilter(), not(igN.createFilter()))
        : ig.createFilter()
}
function parseWhiteList ( files ) { if ( ! files || ! Array . isArray ( files ) ) { return null } const ig = ignore ( ) const igN = ignore ( ) let hasN = false for ( const file of files ) { if ( typeof file === "string" && file ) { const body = file . replace ( SLASH_AT_BEGIN_AND_END , "" ) if ( file . startsWith ( "!" ) ) { igN . add ( ` ${ body } ` ) igN . add ( ` ${ body } ` ) hasN = true } else { ig . add ( ` ${ body } ` ) ig . add ( ` ${ body } ` ) } } } return hasN ? or ( ig . createFilter ( ) , not ( igN . createFilter ( ) ) ) : ig . createFilter ( ) }
Creates a function which checks whether or not a given file should be ignored.

@param {string[]|null} files - File names of whitelist.
@returns {function|null} A function which checks whether or not a given file should be ignored.
Creates a function which checks whether or not a given file should be ignored .