Function isFreetextQualifier

Returns true if the given qualifier is a FreetextQualifier otherwise false.

The condition for being a valid freetext is that the qualifier should have a freetext key and the value should be a string which is more than 3 characters in length. The additional condition is that the value should not contain a whitespace(' ') unless the value is in the key:value pattern.

// valid
{ freetext: 'abc' }
// valid
{ freetext: 'key:value with spaces' }
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// invalid
{ freetext: 'value with spaces' }
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