llll/changelog.md at 42be0adef9bde2cbc5163132270bafaf1c2de092 - llll

13.1.0

Fix bug where $elemMatch tested objects: e.g: sift({a: {$elemMatch: 1}})({ a: { b: 1}}). $elemMatch now expects arrays based on Mongodb syntax. E.g: sift({a: {$elemMatch: 1}})({ a: { b: 1}})

new custom operations syntax (see API readme)
null & undefined are not treated equally (change has been added to keep spec as functionality as possible to MongoDB)
select option has been removed
compare option now expects boolean return value instead of an integer
nested queries are no-longer supported
expressions option is now operations
operations parameter now expects new operations API
ImmutableJS support removed for now
Remove bower support

Query properties now excpect exact object shape (based on https://github.com/crcn/sift.js/issues/152). E.g: [{a: { b: 1}}, {a: { b: 1, c: 2}}]].filter(sift({ a: { b: 1} })) === [{a: {b: 1}], and [{a: 1, b: 1}, {a: 1}]].filter(sift({ a: 1 })) === [{a: 1, b: 1}, {a: 1}].

DEPRECATED indexOf in favor of array.findIndex(sift(query))
second param is now options instead of select function. E.g: sift(query, { expressions: customExpressions, select: selectValue })
DEPRECATED sift(query, array). You must now use array.filter(sift(query))
Queries now expect exact object shape (based on https://github.com/crcn/sift.js/issues/117). E.g: [{a: 1, b: 1}, {a: 1}]].filter(sift({ a: 1 })) === [{a: 1}]

sift.use({
  $operator: function(a) {
    return function(b) {
      // compare here
    };
  }
});