How to use the isBefore function from validator

StringStrategy.js

GitHub: maanyakaran/core

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this.isBase64 = (subject) => {
    return StringValidator.isBase64(subject) ? null : subject + ' is not base64';
}

this.isBefore = (date) => (subject) => {
    return StringValidator.isBefore(subject, date) ? null : subject + ' is not before' + date;
}

this.isBoolean = (subject) => {
    return StringValidator.isBoolean(subject) ? null : subject + ' is not boolean';

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validation.js

GitHub: rappopo/dab

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  if (!m.isValid()) return false
  return validatorJs.isAfter(value, m.toDate())
}

validator.isBefore = function (value, dt, format) {
  if (!dt) return validatorJs.isBefore(value)
  let m = _.isEmpty(format) ? moment(dt) : moment(dt, format)
  if (!m.isValid()) return false
  return validatorJs.isBefore(value, m.toDate())
}

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+ 7 other calls in file

express-validator2.js

GitHub: yinhaixiang/express-validator2

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  }
  return true;
},
isBefore: function(rule, value) {
  if (rule) {
    return validator.isBefore(value);
  }
  return true;
},
isIn: function(rule, value) {

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+ 5 other calls in file

validators.js

GitHub: mmerkes/express-route-validator

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isAscii: validator.isAscii,
// isBase64(str) - check if a string is base64 encoded.
isBase64: validator.isBase64,
// isBefore(str [, date]) - check if the string is a date that's before the specified date.
isBefore: function (str, date) {
  return validator.isBefore(str, typeof date !== 'boolean' ? date : undefined);
},
// isBoolean(str) - check if a string is a boolean.
isBoolean: validator.isBoolean,
// isByteLength(str, min [, max]) - check if the string's length (in bytes) falls in a range.

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+ 17 other calls in file