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注意: このページはまだ日本語に翻訳されていません。以下は英語の原文です。
type TopicFilter: (null | string | string[])[];
A TopicFilter provides a struture to define bloom-filter queries. Each field that is null matches any value, a field that is a string must match exactly that value and and array is effectively an OR-ed set, where any one of those values must match.

Source

providers/provider.ts:2605