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import {  Context,  DdcEvent,  DdcOptions,  FilterOptions,  Item,  OnCallback,  SourceOptions,} from "../types.ts";import { Denops } from "../deps.ts";
export type OnInitArguments<Params extends Record<string, unknown>> = {  denops: Denops;  filterOptions: FilterOptions;  filterParams: Params;};
export type OnEventArguments<Params extends Record<string, unknown>> = {  denops: Denops;  context: Context;  onCallback: OnCallback;  options: DdcOptions;  filterOptions: FilterOptions;  filterParams: Params;};
export type FilterArguments<Params extends Record<string, unknown>> = {  denops: Denops;  context: Context;  onCallback: OnCallback;  options: DdcOptions;  sourceOptions: SourceOptions;  filterOptions: FilterOptions;  filterParams: Params;  completeStr: string;  candidates: Item[]; // Deprecated  items: Item[];};
export abstract class BaseFilter<Params extends Record<string, unknown>> {  name = "";  isInitialized = false;  apiVersion = 4;
  events: DdcEvent[] = [];
  async onInit(_args: OnInitArguments<Params>): Promise<void> {}
  async onEvent(_args: OnEventArguments<Params>): Promise<void> {}
  abstract filter({}: FilterArguments<Params>): Promise<Item[]>;
  abstract params(): Params;}
export function defaultFilterOptions(): FilterOptions {  return {    placeholder: undefined,  };}
export function defaultFilterParams(): Record<string, unknown> {  return {};}