Lightweight, in-memory implementation of VectorStore in TypeScript.
**Signature:**
```typescript
export declare class MemoryVectorStore implements VectorStore
```
## Methods
| Method | Modifiers | Description |
|---|---|---|
| [upsert(records)](https://developers.google.com/edge/api/mediapipe/js/tasks-retrieval.memoryvectorstore.md.txt#memoryvectorstoreupsert) | | Upserts records into the vector store. |
| [delete(ids)](https://developers.google.com/edge/api/mediapipe/js/tasks-retrieval.memoryvectorstore.md.txt#memoryvectorstoredelete) | | Deletes records by their IDs. |
| [deleteByMetadata(metadataFilter)](https://developers.google.com/edge/api/mediapipe/js/tasks-retrieval.memoryvectorstore.md.txt#memoryvectorstoredeletebymetadata) | | Deletes records matching a metadata filter. |
| [search(queryEmbedding, topK, metadataFilter)](https://developers.google.com/edge/api/mediapipe/js/tasks-retrieval.memoryvectorstore.md.txt#memoryvectorstoresearch) | | Searches for top-K matching records. |
| [get(ids)](https://developers.google.com/edge/api/mediapipe/js/tasks-retrieval.memoryvectorstore.md.txt#memoryvectorstoreget) | | Retrieves records by IDs. |
| [getAllRecordIds()](https://developers.google.com/edge/api/mediapipe/js/tasks-retrieval.memoryvectorstore.md.txt#memoryvectorstoregetallrecordids) | | Gets all unique record IDs. |
| [deleteAll()](https://developers.google.com/edge/api/mediapipe/js/tasks-retrieval.memoryvectorstore.md.txt#memoryvectorstoredeleteall) | | Deletes all records. |
| [close()](https://developers.google.com/edge/api/mediapipe/js/tasks-retrieval.memoryvectorstore.md.txt#memoryvectorstoreclose) | | Closes the vector store. |
## MemoryVectorStore.upsert() {#memoryvectorstoreupsert}
Upserts records into the vector store.
**Signature:**
```typescript
upsert(records: readonly RetrievalRecord[]): void;
```
### Parameters
| Parameter | Type | Description |
|---|---|---|
| records | readonly RetrievalRecord\[\] | |
**Returns:**
void
## MemoryVectorStore.delete() {#memoryvectorstoredelete}
Deletes records by their IDs.
**Signature:**
```typescript
delete(ids: readonly string[]): void;
```
### Parameters
| Parameter | Type | Description |
|---|---|---|
| ids | readonly string\[\] | |
**Returns:**
void
## MemoryVectorStore.deleteByMetadata() {#memoryvectorstoredeletebymetadata}
Deletes records matching a metadata filter.
**Signature:**
```typescript
deleteByMetadata(metadataFilter: Record): void;
```
### Parameters
| Parameter | Type | Description |
|---|---|---|
| metadataFilter | Record\ | |
**Returns:**
void
## MemoryVectorStore.search() {#memoryvectorstoresearch}
Searches for top-K matching records.
**Signature:**
```typescript
search(queryEmbedding: Float32Array | readonly number[], topK: number, metadataFilter?: Record): RetrievalRecord[];
```
### Parameters
| Parameter | Type | Description |
|---|---|---|
| queryEmbedding | Float32Array \| readonly number\[\] | |
| topK | number | |
| metadataFilter | Record\ | |
**Returns:**
RetrievalRecord\[\]
## MemoryVectorStore.get() {#memoryvectorstoreget}
Retrieves records by IDs.
**Signature:**
```typescript
get(ids: readonly string[]): RetrievalRecord[];
```
### Parameters
| Parameter | Type | Description |
|---|---|---|
| ids | readonly string\[\] | |
**Returns:**
RetrievalRecord\[\]
## MemoryVectorStore.getAllRecordIds() {#memoryvectorstoregetallrecordids}
Gets all unique record IDs.
**Signature:**
```typescript
getAllRecordIds(): string[];
```
**Returns:**
string\[\]
## MemoryVectorStore.deleteAll() {#memoryvectorstoredeleteall}
Deletes all records.
**Signature:**
```typescript
deleteAll(): void;
```
**Returns:**
void
## MemoryVectorStore.close() {#memoryvectorstoreclose}
Closes the vector store.
**Signature:**
```typescript
close(): void;
```
**Returns:**
void