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323 lines
12 KiB
323 lines
12 KiB
import { EventEmitter } from 'events'
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declare namespace lmdb {
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export function open<V = any, K extends Key = Key>(path: string, options: RootDatabaseOptions): RootDatabase<V, K>
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export function open<V = any, K extends Key = Key>(options: RootDatabaseOptionsWithPath): RootDatabase<V, K>
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class Database<V = any, K extends Key = Key> extends EventEmitter {
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/**
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* Get the value stored by given id/key
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* @param id The key for the entry
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**/
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get(id: K): V | undefined
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/**
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* Get the entry stored by given id/key, which includes both the value and the version number (if available)
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* @param id The key for the entry
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**/
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getEntry(id: K): {
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value: V
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version?: number
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} | undefined
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/**
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* Get the value stored by given id/key in binary format, as a Buffer
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* @param id The key for the entry
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**/
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getBinary(id: K): Buffer | undefined
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/**
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* Get the value stored by given id/key in binary format, as a temporary Buffer.
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* This is faster, but the data is only valid until the next get operation
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* @param id The key for the entry
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**/
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getBinaryFast(id: K): Buffer | undefined
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/**
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* Store the provided value, using the provided id/key
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* @param id The key for the entry
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* @param value The value to store
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**/
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put(id: K, value: V): Promise<boolean>
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/**
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* Store the provided value, using the provided id/key and version number, and optionally the required
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* existing version
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* @param id The key for the entry
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* @param value The value to store
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* @param version The version number to assign to this entry
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* @param ifVersion If provided the put will only succeed if the previous version number matches this (atomically checked)
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**/
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put(id: K, value: V, version: number, ifVersion?: number): Promise<boolean>
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/**
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* Remove the entry with the provided id/key
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* @param id The key for the entry to remove
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**/
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remove(id: K): Promise<boolean>
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/**
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* Remove the entry with the provided id/key, conditionally based on the provided existing version number
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* @param id The key for the entry to remove
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* @param ifVersion If provided the remove will only succeed if the previous version number matches this (atomically checked)
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**/
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remove(id: K, ifVersion: number): Promise<boolean>
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/**
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* Remove the entry with the provided id/key and value (mainly used for dupsort databases) and optionally the required
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* existing version
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* @param id The key for the entry to remove
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* @param valueToRemove The value for the entry to remove
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**/
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remove(id: K, valueToRemove: V): Promise<boolean>
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/**
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* Syncronously store the provided value, using the provided id/key, will return after the data has been written.
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* @param id The key for the entry
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* @param value The value to store
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**/
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putSync(id: K, value: V): void
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/**
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* Syncronously store the provided value, using the provided id/key and version number
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* @param id The key for the entry
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* @param value The value to store
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* @param version The version number to assign to this entry
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**/
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putSync(id: K, value: V, version: number): void
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/**
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* Syncronously store the provided value, using the provided id/key and options
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* @param id The key for the entry
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* @param value The value to store
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* @param options The version number to assign to this entry
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**/
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putSync(id: K, value: V, options: PutOptions): void
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/**
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* Syncronously remove the entry with the provided id/key
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* existing version
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* @param id The key for the entry to remove
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**/
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removeSync(id: K): boolean
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/**
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* Synchronously remove the entry with the provided id/key and value (mainly used for dupsort databases)
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* existing version
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* @param id The key for the entry to remove
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* @param valueToRemove The value for the entry to remove
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**/
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removeSync(id: K, valueToRemove: V): boolean
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/**
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* Get all the values for the given key (for dupsort databases)
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* existing version
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* @param key The key for the entry to remove
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* @param options The options for the iterator
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**/
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getValues(key: K, options?: RangeOptions): ArrayLikeIterable<V>
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/**
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* Get the count of all the values for the given key (for dupsort databases)
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* existing version
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* @param options The options for the range/iterator
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**/
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getValuesCount(key: K, options?: RangeOptions): number
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/**
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* Get all the unique keys for the given range
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* existing version
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* @param options The options for the range/iterator
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**/
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getKeys(options: RangeOptions): ArrayLikeIterable<K>
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/**
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* Get the count of all the unique keys for the given range
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* existing version
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* @param options The options for the range/iterator
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**/
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getKeysCount(options: RangeOptions): number
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/**
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* Get all the entries for the given range
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* existing version
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* @param options The options for the range/iterator
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**/
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getRange(options: RangeOptions): ArrayLikeIterable<{ key: K, value: V, version?: number }>
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/**
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* Get the count of all the entries for the given range
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* existing version
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* @param options The options for the range/iterator
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**/
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getCount(options: RangeOptions): number
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/**
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* @deprecated Since v1.3.0, this will be replaced with the functionality of transactionAsync in a future release
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**/
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transaction<T>(action: () => T): T
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/**
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* Execute a transaction syncronously, running all the actions within the action callback in the transaction,
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* and committing the transaction after the action callback completes.
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* existing version
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* @param action The function to execute within the transaction
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* @param abort If true will abort the transaction when completed
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**/
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transactionSync<T>(action: () => T): T
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/**
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* Execute a transaction asyncronously, running all the actions within the action callback in the transaction,
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* and committing the transaction after the action callback completes.
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* existing version
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* @param action The function to execute within the transaction
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**/
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transactionAsync<T>(action: () => T): Promise<T>
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/**
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* Execute a transaction asyncronously, running all the actions within the action callback in the transaction,
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* and committing the transaction after the action callback completes.
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* existing version
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* @param action The function to execute within the transaction
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* @param abort If true will abort the transaction when completed
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**/
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childTransaction<T>(action: () => T): Promise<T>
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/**
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* Execute writes actions that are all conditionally dependent on the entry with the provided key having the provided
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* version number (checked atomically).
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* @param id Key of the entry to check
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* @param ifVersion The require version number of the entry for all actions to succeed
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* @param action The function to execute with actions that will be dependent on this condition
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**/
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ifVersion(id: K, ifVersion: number, action: () => any): Promise<boolean>
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/**
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* Execute writes actions that are all conditionally dependent on the entry with the provided key
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* not existing (checked atomically).
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* @param id Key of the entry to check
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* @param action The function to execute with actions that will be dependent on this condition
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**/
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ifNoExists(id: K, action: () => any): Promise<boolean>
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/**
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* Check if an entry for the provided key exists
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* @param id Key of the entry to check
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*/
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doesExist(key: K): boolean
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/**
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* Check if an entry for the provided key/value exists
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* @param id Key of the entry to check
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* @param value Value of the entry to check
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*/
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doesExist(key: K, value: V): boolean
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/**
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* Check if an entry for the provided key exists with the expected version
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* @param id Key of the entry to check
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* @param version Expected version
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*/
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doesExist(key: K, version: number): boolean
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/**
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* Delete this database/store.
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**/
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deleteDB(): void
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/**
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* Clear all the entries from this database/store.
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**/
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clear(): void
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/**
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* Check the reader locks and remove any stale reader locks. Returns the number of stale locks that were removed.
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**/
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readerCheck(): number
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/**
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* Returns a string that describes all the current reader locks, useful for debugging if reader locks aren't being removed.
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**/
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readerList(): string
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/**
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* Returns statistics about the current database
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**/
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getStats(): {}
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/**
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* Explicitly force the read transaction to reset to the latest snapshot/version of the database
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**/
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resetReadTxn(): void
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/**
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* Make a snapshot copy of the current database at the indicated path
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**/
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backup(path: string): Promise<void>
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/**
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* Close the current database.
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**/
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close(): void
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}
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/* A special value that can be returned from a transaction to indicate that the transaction should be aborted */
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export const ABORT = 10000000000000
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class RootDatabase<V = any, K extends Key = Key> extends Database<V, K> {
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/**
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* Open a database store using the provided options.
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**/
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openDB(options: DatabaseOptions & { name: string }): Database<V, K>
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/**
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* Open a database store using the provided options.
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**/
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openDB(dbName: string, dbOptions: DatabaseOptions): Database<V, K>
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}
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type Key = Key[] | string | symbol | number | boolean | Buffer;
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interface DatabaseOptions {
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name?: string
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cache?: boolean
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compression?: boolean | CompressionOptions
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encoding?: 'msgpack' | 'json' | 'string' | 'binary' | 'ordered-binary'
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sharedStructuresKey?: Key
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useVersions?: boolean
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keyIsBuffer?: boolean
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keyIsUint32?: boolean
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dupSort?: boolean
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strictAsyncOrder?: boolean
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}
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interface RootDatabaseOptions extends DatabaseOptions {
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/** The maximum number of databases to be able to open (there is some extra overhead if this is set very high).*/
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maxDbs?: number
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/** Set a longer delay (in milliseconds) to wait longer before committing writes to increase the number of writes per transaction (higher latency, but more efficient) **/
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commitDelay?: number
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asyncTransactionOrder?: 'after' | 'before' | 'strict'
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mapSize?: number
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pageSize?: number
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remapChunks?: boolean
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/** This provides a small performance boost (when not using useWritemap) for writes, by skipping zero'ing out malloc'ed data, but can leave application data in unused portions of the database. This is recommended unless there are concerns of database files being accessible. */
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noMemInit?: boolean
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/** Use writemaps, discouraged at this. This improves performance by reducing malloc calls, but it is possible for a stray pointer to corrupt data. */
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useWritemap?: boolean
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noSubdir?: boolean
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noSync?: boolean
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noMetaSync?: boolean
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readOnly?: boolean
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mapAsync?: boolean
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maxReaders?: number
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winMemoryPriority?: 1 | 2 | 3 | 4 | 5
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}
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interface RootDatabaseOptionsWithPath extends RootDatabaseOptions {
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path: string
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}
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interface CompressionOptions {
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threshold?: number
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dictionary?: Buffer
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}
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interface RangeOptions {
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/** Starting key for a range **/
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start?: Key
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/** Ending key for a range **/
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end?: Key
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/** Iterate through the entries in reverse order **/
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reverse?: boolean
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/** Include version numbers in each entry returned **/
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versions?: boolean
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/** The maximum number of entries to return **/
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limit?: number
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/** The number of entries to skip **/
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offset?: number
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/** Use a snapshot of the database from when the iterator started **/
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snapshot?: boolean
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}
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interface PutOptions {
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/* Append to the database using MDB_APPEND, which can be faster */
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append?: boolean
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/* Append to a dupsort database using MDB_APPENDDUP, which can be faster */
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appendDup?: boolean
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/* Perform put with MDB_NOOVERWRITE which will fail if the entry for the key already exists */
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noOverwrite?: boolean
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/* Perform put with MDB_NODUPDATA which will fail if the entry for the key/value already exists */
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noDupData?: boolean
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/* The version of the entry to set */
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version?: number
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}
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class ArrayLikeIterable<T> implements Iterable<T> {
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map<U>(callback: (entry: T) => U): ArrayLikeIterable<U>
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filter(callback: (entry: T) => any): ArrayLikeIterable<T>
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[Symbol.iterator]() : Iterator<T>
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forEach(callback: (entry: T) => any): void
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asArray: T[]
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}
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export function getLastVersion(): number
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export function compareKey(a: Key, b: Key): number
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}
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export = lmdb
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