Please export the operatorsMap from Data Query's filter-no-eval.js.
If exporting the operators map is not an option, consider introducing an enum which defines the operators as constants:
export enum Operators {
contains = 'contains',
doesnotcontain = 'doesnotcontain',
doesnotendwith = 'doesnotendwith',
doesnotstartwith = 'doesnotstartwith',
endswith = 'endswith',
eq = 'eq',
gt = 'gt',
gte = 'gte',
isempty = 'isempty',
isnotempty = 'isnotempty',
isnotnull = 'isnotnull',
isnull = 'isnull',
lt = 'lt',
lte = 'lte',
neq = 'neq',
startswith = 'startswith'
}