providerSchema.pre('save', function(next) {

    if(this.level === 4){
        if(this.description.length >= 80 || this.certifications.length > 5){
            next(new Error('your current plan does not have this feature'));
        } else {
            next()
        }
    } else if(this.level === 3){
        if(this.description.length >= 50 || this.certifications.length > 3){
            next(new Error('your current plan does not have this feature'));
        } else {
            next()
        }
    } else if(this.level === 2){
        if(this.description.length >= 30 || this.certifications.length > 0 || this.teaser || this.social.length > 0){
            next(new Error('your current plan does not have this feature'));
        } else {
            next()
        }
    } else if(this.level === 1){
        if(this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart){
            next(new Error('your current plan does not have this feature'));
        } else {
            next()
        }
    } else {
        if(this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart){
            next(new Error('your current plan does not have this feature'));
        } else {
            next()
        }
});

providerSchema.pre('save', function(next) {

    if(((this.level === 4) && (this.description.length >= 80 || this.certifications.length > 5)) ||
       ((this.level === 3) && (this.description.length >= 50 || this.certifications.length > 3)) ||
       ((this.level === 2) && (this.description.length >= 30 || this.certifications.length > 0 || this.teaser || this.social.length > 0)) ||
       ((this.level === 1 || this.level === 0) && (this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart))){
         next(new Error('your current plan does not have this feature'));
    } else {
         next()
    }
});
```

providerSchema.pre('save', function (next) {

     var valid = true;
    if (this.level === 4) {
        if (this.description.length >= 80 || this.certifications.length > 5) {
            valid = false;
        }
    } else if (this.level === 3) {
        if (this.description.length >= 50 || this.certifications.length > 3) {
            valid = false;
        }
    } else if (this.level === 2) {
        if (this.description.length >= 30 || this.certifications.length > 0 || this.teaser || this.social.length > 0) {
            valid = false;
        }
    } else if (this.level === 1) {
        if (this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart) {
            valid = false;
        }
    } else {
        if (this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart) {
            valid = false;
        }
    }

    if (valid) {
        next();
    } else {
        next(new Error('your current plan does not have this feature'));
    }
});

providerSchema.pre('save', function (next) {
    if (isValidFeatureRequest()) {
        next();
    } else {
        next(new Error('your current plan does not have this feature'));
    }

    function isValidFeatureRequest() {
        if (this.level === 4) {
            if (this.description.length >= 80 || this.certifications.length > 5) {
                return false;
            }
        } else if (this.level === 3) {
            if (this.description.length >= 50 || this.certifications.length > 3) {
                return false;
            }
        } else if (this.level === 2) {
            if (this.description.length >= 30 || this.certifications.length > 0 || this.teaser || this.social.length > 0) {
                return false;
            }
        } else if (this.level === 1) {
            if (this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart) {
                return false;
            }
        } else {
            if (this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart) {
                return false;
            }
        }
        return true;
    }
});

providerSchema.pre('save', function (next) {
    if (isValidFeatureRequest()) {
        next();
    } else {
        next(new Error('your current plan does not have this feature'));
    }

    function isValidFeatureRequest() {
        if (this.level === 4) {
            if (this.description.length >= 80 || this.certifications.length > 5) {
                return false;
            }
        } else if (this.level === 3) {
            if (this.description.length >= 50 || this.certifications.length > 3) {
                return false;
            }
        } else if (this.level === 2) {
            if (this.description.length >= 30 || this.certifications.length > 0 || this.teaser || this.social.length > 0) {
                return false;
            }
        } else {
            if (this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart) {
                return false;
            }
        }
        return true;
    }
});

function                               | CC
-------------------------------------------
providerSchema                         | 2
isValidFeatureRequest                  | 20

providerSchema.pre('save', function (next) {
    if (isValidFeatureRequest()) {
        next();
    } else {
        next(new Error('your current plan does not have this feature'));
    }

    function isValidFeatureRequest() {
        if (this.level === 4) {
            if (descriptionOrCertificationsOffLimits(80, 5)) {
                return false;
            }
        } else if (this.level === 3) {
            if (descriptionOrCertificationsOffLimits(40, 3)) {
                return false;
            }
        } else if (this.level === 2) {
            if (descriptionOrCertificationsOffLimits(30, 0) || this.teaser || this.social.length > 0) {
                return false;
            }
        } else {
            if (this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart) {
                return false;
            }
        }
        return true;
    }

    function descriptionOrCertificationsOffLimits(descriptionLimit, certificationsLimit) {
        return this.description.length >= descriptionLimit || this.certifications.length > certificationsLimit;
    }
});

function                               | CC
-------------------------------------------
providerSchema                         | 2
isValidFeatureRequest                  | 17
descriptionOrCertificationsOffLimits   | 2

providerSchema.pre('save', function (next) {
    if (isValidFeatureRequest()) {
        next();
    } else {
        next(new Error('your current plan does not have this feature'));
    }

    function isValidFeatureRequest() {
        if (this.level === 4) {
            if (descriptionOrCertificationsOffLimits(80, 5)) {
                return false;
            }
        } else if (this.level === 3) {
            if (descriptionOrCertificationsOffLimits(40, 3)) {
                return false;
            }
        } else if (this.level === 2) {
            if (descriptionOrCertificationsOffLimits(30, 0) || this.teaser || this.social.length > 0) {
                return false;
            }
        } else if (hasAny()) {
            return false;
        }
        return true;
    }

    function descriptionOrCertificationsOffLimits(descriptionLimit, certificationsLimit) {
        return this.description.length >= descriptionLimit || this.certifications.length > certificationsLimit;
    }

    function hasAny() {
        return this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart;
    }
});

function                               | CC
-------------------------------------------
providerSchema                         | 2
isValidFeatureRequest                  | 10
descriptionOrCertificationsOffLimits   | 2
hasAny                                 | 8

function hasAny() {
        return this.description ||
            this.certifications.length > 0 ||
            this.teaser ||
            this.social.length > 0 ||
            this.locationLat ||
            this.locationLong ||
            this.workingHourEnd ||
            this.workingHourStart;
    }

providerSchema.pre('save', function (next) {
    if (isValidFeatureRequest()) {
        next();
    } else {
        next(new Error('your current plan does not have this feature'));
    }

    function isValidFeatureRequest() {
        if (this.level === 4) {
            if (descriptionOrCertificationsOffLimits(80, 5)) {
                return false;
            }
        } else if (this.level === 3) {
            if (descriptionOrCertificationsOffLimits(40, 3)) {
                return false;
            }
        } else if (this.level === 2) {
            if (descriptionOrCertificationsOffLimits(30, 0) || hasTeaserOrSocial()) {
                return false;
            }
        } else if (hasAny()) {
            return false;
        }
        return true;
    }

    function descriptionOrCertificationsOffLimits(descriptionLimit, certificationsLimit) {
        return this.description.length >= descriptionLimit || this.certifications.length > certificationsLimit;
    }

    function hasTeaserOrSocial() {
        return this.teaser || this.social.length > 0;
    }

    function hasAny() {
        return this.description ||
            this.certifications.length > 0 ||
            this.teaser ||
            this.social.length > 0 ||
            this.locationLat ||
            this.locationLong ||
            this.workingHourEnd ||
            this.workingHourStart;
    }
});

function                               | CC
-------------------------------------------
providerSchema                         | 2
isValidFeatureRequest                  | 9
descriptionOrCertificationsOffLimits   | 2
hasTeaserOrSocial                      | 2
hasAny                                 | 8

function isValidFeatureRequest() {
        if (this.level === 4 && descriptionOrCertificationsOffLimits(80, 5)) {
            return false;
        } else if (this.level === 3 && descriptionOrCertificationsOffLimits(40, 3)) {
            return false;
        } else if (this.level === 2 && descriptionOrCertificationsOffLimits(30, 0) || hasTeaserOrSocial()) {
            return false;
        } else if (hasAny()) {
            return false;
        }
        return true;
    }

function isValidFeatureRequest() {
        if (isLevel4AndNotValid()) {
            return false;
        } else if (isLevel3AndNotValid()) {
            return false;
        } else if (isLevel2AndNotValid()) {
            return false;
        } else if (hasAny()) {
            return false;
        }
        return true;
    }

    function isLevel4AndNotValid() {
        return this.level === 4 && descriptionOrCertificationsOffLimits(80, 5);
    }

    function isLevel3AndNotValid() {
        return this.level === 3 && descriptionOrCertificationsOffLimits(40, 3);
    }

    function isLevel2AndNotValid() {
        this.level === 2 && (descriptionOrCertificationsOffLimits(30, 0) || hasTeaserOrSocial());
    }

function                               | CC
-------------------------------------------
providerSchema                         | 2
isValidFeatureRequest                  | 5
isLevel4AndNotValid                    | 2
isLevel3AndNotValid                    | 2
isLevel2AndNotValid                    | 3
descriptionOrCertificationsOffLimits   | 2
hasTeaserOrSocial                      | 2
hasAny                                 | 8

function isValidFeatureRequest() {
        if (isLevel4AndNotValid()) {
            return false;
        }

        if (isLevel3AndNotValid()) {
            return false;
        }

        if (isLevel2AndNotValid()) {
            return false;
        }

        return !hasAny();
    }

providerSchema.pre('save', function (next) {
    if (isValidFeatureRequest()) {
        next();
    } else {
        next(new Error('your current plan does not have this feature'));
    }

    function isValidFeatureRequest() {
        if (isLevel4AndNotValid()) {
            return false;
        }

        if (isLevel3AndNotValid()) {
            return false;
        }

        if (isLevel2AndNotValid()) {
            return false;
        }

        return !hasAny();
    }

    function isLevel4AndNotValid() {
        return this.level === 4 && descriptionOrCertificationsOffLimits(80, 5);
    }

    function isLevel3AndNotValid() {
        return this.level === 3 && descriptionOrCertificationsOffLimits(40, 3);
    }

    function isLevel2AndNotValid() {
        this.level === 2 && (descriptionOrCertificationsOffLimits(30, 0) || hasTeaserOrSocial());
    }

    function descriptionOrCertificationsOffLimits(descriptionLimit, certificationsLimit) {
        return this.description.length >= descriptionLimit || this.certifications.length > certificationsLimit;
    }

    function hasTeaserOrSocial() {
        return this.teaser || this.social.length > 0;
    }

    function hasAny() {
        return this.description ||
            this.certifications.length > 0 ||
            this.teaser ||
            this.social.length > 0 ||
            this.locationLat ||
            this.locationLong ||
            this.workingHourEnd ||
            this.workingHourStart;
    }
});

function                               | CC
-------------------------------------------
providerSchema                         | 2
isValidFeatureRequest                  | 4
isLevel4AndNotValid                    | 2
isLevel3AndNotValid                    | 2
isLevel2AndNotValid                    | 3
descriptionOrCertificationsOffLimits   | 2
hasTeaserOrSocial                      | 2
hasAny                                 | 8

function bar(foo) {
  if (foo === 2) { foo = 3 } // path 1
  else { foo = 4 } // path 2
  return foo;
}


function bar(foo) {
  if (foo === 2) { foo = 3 } // path 1
                             // hidden else path 2
  return foo;
}

function bar(foo) {
  if (foo === 2) { foo = 3 } // path 1
  else if (foo === 4) { foo = 5 } // path 2
  else { foo = 4 } // path 3
  return foo;
}

function bar(foo) {
  if (foo === 2 || foo === 4) { foo = 3 } // path 1 and 2
  else { foo = 4 } // path 3
  return foo;
}

function poo(foo) {
  if (foo === 2 || foo === 4) { foo = 3 }
  else { foo = 4 }
  return foo;
}
function bar(foo) {
  if (foo === 2 || foo === 4) { foo = 3 }
  else { foo = poo(foo) }
  return foo;
}

providerSchema.pre('save', function(next) {

    if(((this.level === 4) && (this.description.length >= 80 || this.certifications.length > 5)) ||
       ((this.level === 3) && (this.description.length >= 50 || this.certifications.length > 3)) ||
       ((this.level === 2) && (this.description.length >= 30 || this.certifications.length > 0 || this.teaser || this.social.length > 0)) ||
       ((this.level === 1 || this.level === 0) && (this.description || this.certifications.length > 0 || this.teaser || this.social.length > 0 || this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart))){
         next(new Error('your current plan does not have this feature'));
    } else {
         next()
    }
});

function foo(a) {
  if(a === 1) { a = 2 }
  else if (a === 2) { a = 3 }
  else if (a === 3) { a = 4 }
  else { a = undefined }
  return a;
}

function foo(a) {
  return ({"1": 2, "2": 3, "3": 4})[a];
}

providerSchema.pre('save', function(next) {
    const checkSocial = () => this.description || this.teaser || this.social.length > 0;
    const checkLocation = () => this.locationLat || this.locationLong || this.workingHourEnd || this.workingHourStart;
    const fail = () => false;
    const levels = {
        "4": {desc: 80, cert: 6, fail},
        "3": {desc: 50, cert: 4, fail},
        "2": {desc: 30, cert: 1, fail() { return checkSocial() } },
        "1": {desc: -1, cert: 1, fail() { return checkSocial() || checkLocation() } },
        "0": {desc: -1, cert: 1, fail() { return checkSocial() || checkLocation() } },
    };

    const checkPass= ({level, description, certifications}) => {
        if(levels[level]) {
            const check = levels[level];
            if(check.fail() && check.desc < description.length && check.cert < certifications.length) {
                return false;
            }
        }
        return true;
    }
    checkPass(this) ? next() : next(new Error("Your current plan does not have this feature."));

});

function validateData(data) {

    switch(data.level) {
        case 0:
        case 1:
            return data.description || data.certifications.length > 0 || data.teaser || data.social.length > 0 || data.locationLat || data.locationLong || data.workingHourEnd || data.workingHourStart
        case 2:
            return data.description.length >= 30 || data.certifications.length > 0 || data.teaser || data.social.length > 0);
        case 3:
            return (data.description.length >= 50 || data.certifications.length > 3));
        case 4:
            return (data.description.length >= 80 || data.certifications.length > 5);
    }
}

providerSchema.pre('save', function(next) {

    if(validateData(this)){
         next(new Error('your current plan does not have this feature'));
    } else {
         next()
    }
});

// For each data field we care about, at what level do various
// conditions on that field become available?
const LEVEL_REQUIREMENTS = [
    ({description}) => {
        if (description.length >= 80) return 5; // or maybe Infinity?
        if (description.length >= 50) return 4;
        if (description.length >= 30) return 3;
        if (description) return 2;
        return 0;
    },
    ({certifications}) => {
        if (certifications.length > 5) return 5;
        if (certifications.length > 3) return 4;
        if (certifications.length > 0) return 3;
        return 0;
    },
    ({teaser}) => teaser ? 3 : 0,
    ({social}) => social.length > 0 ? 3 : 0,
    ({locationLat}) => locationLat ? 2 : 0,
    ({locationLong}) => locationLong ? 2 : 0,
    ({workingHourEnd}) => workingHourEnd ? 2 : 0,
    ({workingHourStart}) => workingHourStart ? 2 : 0,
];

function validate(data) {
    return LEVEL_REQUIREMENTS.every(levelRequirement => data.level >= levelRequirement(data));
}

...

providerSchema.pre('save', function(next) {
    if (validate(this)) {
        next();
    } else {
        next(new Error('your current plan does not have this feature'));
    }
});