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compatible-redis-client.ts
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compatible-redis-client.ts
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export type RedisCallback<T> = (error: Error | null, result: T) => void;
/**
* A minimal subset of the callback interface that is implemented by several Redis
* clients.
*/
export interface CompatibleCallbackRedisClient {
get(key: string, callback?: RedisCallback<string | null>): unknown;
set(key: string, value: string, callback?: RedisCallback<unknown>): unknown;
set(
key: string,
value: string,
expiryMode: string,
time: number,
callback?: RedisCallback<unknown>
): unknown;
del(key: string, callback?: RedisCallback<number>): unknown;
on?(event: 'error', callback?: (error: Error) => unknown): unknown;
sadd(key: string, member: string, callback?: RedisCallback<unknown>): unknown;
srem(key: string, member: string, callback?: RedisCallback<unknown>): unknown;
smembers(key: string, callback?: RedisCallback<string[]>): unknown;
}
/**
* A minimal subset of the Promise interface that is implemented by several Redis clients.
*/
export interface CompatiblePromiseRedisClient {
get(key: string): PromiseLike<string | null>;
set(
key: string,
value: string,
expiryMode?: string,
time?: number
): PromiseLike<unknown>;
del(key: string): PromiseLike<number>;
on?(event: 'error', callback: (error: Error) => unknown): unknown;
sadd(key: string, member: string): PromiseLike<unknown>;
srem(key: string, member: string): PromiseLike<unknown>;
smembers(key: string): PromiseLike<string[]>;
}
export type CompatibleRedisClient =
| CompatibleCallbackRedisClient
| CompatiblePromiseRedisClient;
export function isPromiseClient(
client: CompatibleRedisClient
): client is CompatiblePromiseRedisClient {
const result = client.get('hello');
if (typeof (result as PromiseLike<unknown>)?.then === 'function') {
return true;
}
return false;
}