andrewpietiladotcom/lib/MimeHeader.js

class MimeHeader {
    constructor(message, value) {
        if ( message.indexOf(':') === -1 ) {
            throw new TypeError("Invalid header.");
        }
        this.rawMessage = message;
        if ( value ) {
            // TODO: ICK!
            this.rawMessage = `${this.rawMessage}: ${value}`;
        }
    }

    get key() {
        return this.rawMessage.split(':')[0].trim();
    }

    get rawValue() {
        return this.rawMessage.slice(this.rawMessage.indexOf(':'));
    }

    toString() {
        return this.rawMessage;
    }
}

export default MimeHeader;