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Restrict type for iterateCursor

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This commit is contained in:
Danila Fedorin 2021-08-10 14:11:26 -07:00
parent 46c306b487
commit 2b44878332
2 changed files with 11 additions and 11 deletions
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20
src/matrix/storage/idb/QueryTarget.ts
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@ -18,19 +18,19 @@ import {iterateCursor, reqAsPromise} from "./utils";
type Reducer<A,B> = (acc: B, val: A) => B
interface QueryTargetWrapper<T> {
openCursor: (range?: IDBKeyRange | null , direction?: IDBCursorDirection) => IDBRequest<IDBCursorWithValue>
openKeyCursor: (range: IDBKeyRange, direction: IDBCursorDirection) => IDBRequest<IDBCursor>
interface QueryTargetInterface<T> {
openCursor: (range?: IDBKeyRange | null , direction?: IDBCursorDirection) => IDBRequest<IDBCursorWithValue | null>
openKeyCursor: (range: IDBKeyRange, direction: IDBCursorDirection) => IDBRequest<IDBCursor | null>
supports: (method: string) => boolean
keyPath: string
get: (key: IDBValidKey) => IDBRequest<T>
getKey: (key: IDBValidKey) => IDBRequest<IDBValidKey>
get: (key: IDBValidKey) => IDBRequest<T | null>
getKey: (key: IDBValidKey) => IDBRequest<IDBValidKey | undefined>
}
export class QueryTarget<T> {
private _target: QueryTargetWrapper<T>
private _target: QueryTargetInterface<T>
constructor(target: QueryTargetWrapper<T>) {
constructor(target: QueryTargetInterface<T>) {
this._target = target;
}
@ -50,7 +50,7 @@ export class QueryTarget<T> {
return this._target.supports(methodName);
}
get(key: IDBValidKey): Promise<T> {
get(key: IDBValidKey): Promise<T | null> {
return reqAsPromise(this._target.get(key));
}
@ -58,7 +58,7 @@ export class QueryTarget<T> {
if (this._target.supports("getKey")) {
return reqAsPromise(this._target.getKey(key));
} else {
return reqAsPromise<T>(this._target.get(key)).then(value => {
return reqAsPromise(this._target.get(key)).then(value => {
if (value) {
return value[this._target.keyPath];
}
@ -119,7 +119,7 @@ export class QueryTarget<T> {
async findMaxKey(range: IDBKeyRange): Promise<IDBValidKey | undefined> {
const cursor = this._target.openKeyCursor(range, "prev");
let maxKey;
await iterateCursor(cursor, (value, key) => {
await iterateCursor(cursor, (_, key) => {
maxKey = key;
return {done: true};
});

2
src/matrix/storage/idb/utils.ts
View file

@ -128,7 +128,7 @@ type CursorIterator<T, I extends IDBCursor> = I extends IDBCursorWithValue ?
(value: T, key: IDBValidKey, cursor: IDBCursorWithValue) => { done: boolean, jumpTo?: IDBValidKey } :
(value: undefined, key: IDBValidKey, cursor: IDBCursor) => { done: boolean, jumpTo?: IDBValidKey }
export function iterateCursor<T, I extends IDBCursor = IDBCursorWithValue>(cursorRequest: IDBRequest<I>, processValue: CursorIterator<T, I>): Promise<boolean> {
export function iterateCursor<T, I extends IDBCursor = IDBCursorWithValue>(cursorRequest: IDBRequest<I | null>, processValue: CursorIterator<T, I>): Promise<boolean> {
// TODO: does cursor already have a value here??
return new Promise<boolean>((resolve, reject) => {
cursorRequest.onerror = () => {