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storage.ts
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storage.ts
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/**
* Simplified storage APIs with support for versioned fields, snapshots, metadata, and item definitions.
*
* See [the guide](https://wxt.dev/guide/storage.html) for more information.
*
* @module wxt/storage
*/
import { Storage, browser } from '~/browser';
import { dequal } from 'dequal/lite';
import { logger } from './sandbox/utils/logger';
import { toArray } from './core/utils/arrays';
export const storage = createStorage();
function createStorage(): WxtStorage {
const drivers: Record<string, WxtStorageDriver> = {
local: createDriver('local'),
session: createDriver('session'),
sync: createDriver('sync'),
managed: createDriver('managed'),
};
const getDriver = (area: string) => {
const driver = drivers[area];
if (driver == null) {
const areaNames = Object.keys(drivers).join(', ');
throw Error(`Invalid area "${area}". Options: ${areaNames}`);
}
return driver;
};
const resolveKey = (key: string) => {
const deliminatorIndex = key.indexOf(':');
const driverArea = key.substring(0, deliminatorIndex);
const driverKey = key.substring(deliminatorIndex + 1);
if (driverKey == null)
throw Error(
`Storage key should be in the form of "area:key", but received "${key}"`,
);
return {
driverArea,
driverKey,
driver: getDriver(driverArea),
};
};
const getMetaKey = (key: string) => key + '$';
const getValueOrDefault = (value: any, defaultValue: any) =>
value ?? defaultValue ?? null;
const getMetaValue = (properties: any) =>
typeof properties === 'object' && !Array.isArray(properties)
? properties
: {};
const getItem = async (
driver: WxtStorageDriver,
driverKey: string,
opts: GetItemOptions<any> | undefined,
) => {
const res = await driver.getItem<any>(driverKey);
return getValueOrDefault(res, opts?.defaultValue);
};
const getMeta = async (driver: WxtStorageDriver, driverKey: string) => {
const metaKey = getMetaKey(driverKey);
const res = await driver.getItem<any>(metaKey);
return getMetaValue(res);
};
const setItem = async (
driver: WxtStorageDriver,
driverKey: string,
value: any,
) => {
await driver.setItem(driverKey, value ?? null);
};
const setMeta = async (
driver: WxtStorageDriver,
driverKey: string,
properties: any | undefined,
) => {
const metaKey = getMetaKey(driverKey);
const existingFields = getMetaValue(await driver.getItem(metaKey));
const newFields = { ...existingFields };
Object.entries(properties).forEach(([key, value]) => {
if (value == null) {
delete newFields[key];
} else {
newFields[key] = value;
}
});
await driver.setItem(metaKey, newFields);
};
const removeItem = async (
driver: WxtStorageDriver,
driverKey: string,
opts: RemoveItemOptions | undefined,
) => {
await driver.removeItem(driverKey);
if (opts?.removeMeta) {
const metaKey = getMetaKey(driverKey);
await driver.removeItem(metaKey);
}
};
const removeMeta = async (
driver: WxtStorageDriver,
driverKey: string,
properties: string | string[] | undefined,
) => {
const metaKey = getMetaKey(driverKey);
if (properties == null) {
await driver.removeItem(metaKey);
} else {
const newFields = getMetaValue(await driver.getItem(metaKey));
toArray(properties).forEach((field) => delete newFields[field]);
await driver.setItem(metaKey, newFields);
}
};
const watch = (
driver: WxtStorageDriver,
driverKey: string,
cb: WatchCallback<any>,
) => {
return driver.watch(driverKey, cb);
};
const storage: WxtStorage = {
getItem: async (key, opts) => {
const { driver, driverKey } = resolveKey(key);
return await getItem(driver, driverKey, opts);
},
getItems: async (keys) => {
const areaToKeyMap = new Map<string, string[]>();
const keyToOptsMap = new Map<string, GetItemOptions<any> | undefined>();
keys.forEach((key) => {
let keyStr: string;
let opts: GetItemOptions<any> | undefined;
if (typeof key === 'string') {
keyStr = key;
} else {
keyStr = key.key;
opts = key.options;
}
const { driverArea, driverKey } = resolveKey(keyStr);
const keys = areaToKeyMap.get(driverArea) ?? [];
areaToKeyMap.set(driverArea, keys.concat(driverKey));
keyToOptsMap.set(keyStr, opts);
});
const results = await Promise.all(
Array.from(areaToKeyMap.entries()).map(async ([driverArea, keys]) => {
const driverResults = await drivers[driverArea].getItems(keys);
return driverResults.map((driverResult) => {
const key = `${driverArea}:${driverResult.key}`;
const value = getValueOrDefault(
driverResult.value,
keyToOptsMap.get(key)?.defaultValue,
);
return { key, value };
});
}),
);
return results.flat();
},
getMeta: async (key) => {
const { driver, driverKey } = resolveKey(key);
return await getMeta(driver, driverKey);
},
setItem: async (key, value) => {
const { driver, driverKey } = resolveKey(key);
await setItem(driver, driverKey, value);
},
setItems: async (values) => {
const areaToKeyValueMap = new Map<
string,
Array<{ key: string; value: any }>
>();
values.forEach(({ key, value }) => {
const { driverArea, driverKey } = resolveKey(key);
const values = areaToKeyValueMap.get(driverArea) ?? [];
areaToKeyValueMap.set(
driverArea,
values.concat({ key: driverKey, value }),
);
});
await Promise.all(
Array.from(areaToKeyValueMap.entries()).map(
async ([driverArea, values]) => {
const driver = getDriver(driverArea);
await driver.setItems(values);
},
),
);
},
setMeta: async (key, properties) => {
const { driver, driverKey } = resolveKey(key);
await setMeta(driver, driverKey, properties);
},
removeItem: async (key, opts) => {
const { driver, driverKey } = resolveKey(key);
await removeItem(driver, driverKey, opts);
},
removeItems: async (keys) => {
const areaToKeysMap = new Map<string, string[]>();
keys.forEach((key) => {
let keyStr: string;
let opts: RemoveItemOptions | undefined;
if (typeof key === 'string') {
keyStr = key;
} else {
keyStr = key.key;
opts = key.options;
}
const { driverArea, driverKey } = resolveKey(keyStr);
const areaKeys = areaToKeysMap.get(driverArea) ?? [];
areaKeys.push(driverKey);
if (opts?.removeMeta) {
areaKeys.push(getMetaKey(driverKey));
}
areaToKeysMap.set(driverArea, areaKeys);
});
await Promise.all(
Array.from(areaToKeysMap.entries()).map(async ([driverArea, keys]) => {
const driver = getDriver(driverArea);
await driver.removeItems(keys);
}),
);
},
removeMeta: async (key, properties) => {
const { driver, driverKey } = resolveKey(key);
await removeMeta(driver, driverKey, properties);
},
snapshot: async (base, opts) => {
const driver = getDriver(base);
const data = await driver.snapshot();
opts?.excludeKeys?.forEach((key) => {
delete data[key];
delete data[getMetaKey(key)];
});
return data;
},
restoreSnapshot: async (base, data) => {
const driver = getDriver(base);
await driver.restoreSnapshot(data);
},
watch: (key, cb) => {
const { driver, driverKey } = resolveKey(key);
return watch(driver, driverKey, cb);
},
unwatch() {
Object.values(drivers).forEach((driver) => {
driver.unwatch();
});
},
defineItem: (key: string, opts?: WxtStorageItemOptions<any>) => {
const { driver, driverKey } = resolveKey(key);
const { version: targetVersion = 1, migrations = {} } = opts ?? {};
if (targetVersion < 1) {
throw Error(
'Storage item version cannot be less than 1. Initial versions should be set to 1, not 0.',
);
}
const migrate = async () => {
const driverMetaKey = getMetaKey(driverKey);
const [{ value }, { value: meta }] = await driver.getItems([
driverKey,
driverMetaKey,
]);
if (value == null) return;
const currentVersion = meta?.v ?? 1;
if (currentVersion > targetVersion) {
throw Error(
`Version downgrade detected (v${currentVersion} -> v${targetVersion}) for "${key}"`,
);
}
logger.debug(
`Running storage migration for ${key}: v${currentVersion} -> v${targetVersion}`,
);
const migrationsToRun = Array.from(
{ length: targetVersion - currentVersion },
(_, i) => currentVersion + i + 1,
);
let migratedValue = value;
for (const migrateToVersion of migrationsToRun) {
migratedValue =
(await migrations?.[migrateToVersion]?.(migratedValue)) ??
migratedValue;
}
await driver.setItems([
{ key: driverKey, value: migratedValue },
{ key: driverMetaKey, value: { ...meta, v: targetVersion } },
]);
logger.debug(
`Storage migration completed for ${key} v${targetVersion}`,
{ migratedValue },
);
};
const migrationsDone =
opts?.migrations == null
? Promise.resolve()
: migrate().catch((err) => {
logger.error(`Migration failed for ${key}`, err);
});
const getDefaultValue = () => opts?.defaultValue ?? null;
return {
get defaultValue() {
return getDefaultValue();
},
getValue: async () => {
await migrationsDone;
return await getItem(driver, driverKey, opts);
},
getMeta: async () => {
await migrationsDone;
return await getMeta(driver, driverKey);
},
setValue: async (value) => {
await migrationsDone;
return await setItem(driver, driverKey, value);
},
setMeta: async (properties) => {
await migrationsDone;
return await setMeta(driver, driverKey, properties);
},
removeValue: async (opts) => {
await migrationsDone;
return await removeItem(driver, driverKey, opts);
},
removeMeta: async (properties) => {
await migrationsDone;
return await removeMeta(driver, driverKey, properties);
},
watch: (cb) =>
watch(driver, driverKey, (newValue, oldValue) =>
cb(newValue ?? getDefaultValue(), oldValue ?? getDefaultValue()),
),
migrate,
};
},
};
return storage;
}
function createDriver(
storageArea: 'local' | 'session' | 'sync' | 'managed',
): WxtStorageDriver {
const getStorageArea = () => {
if (browser.runtime == null) {
throw Error(
[
"'wxt/storage' must be loaded in a web extension environment",
'\n - If thrown during a build, see https://github.com/wxt-dev/wxt/issues/371',
" - If thrown during tests, mock 'wxt/browser' correctly. See https://wxt.dev/guide/testing.html\n",
].join('\n'),
);
}
if (browser.storage == null) {
throw Error(
"You must add the 'storage' permission to your manifest to use 'wxt/storage'",
);
}
const area = browser.storage[storageArea];
if (area == null)
throw Error(`"browser.storage.${storageArea}" is undefined`);
return area;
};
const watchListeners = new Set<
(changes: Storage.StorageAreaOnChangedChangesType) => void
>();
return {
getItem: async (key) => {
const res = await getStorageArea().get(key);
return res[key];
},
getItems: async (keys) => {
const result = await getStorageArea().get(keys);
return keys.map((key) => ({ key, value: result[key] ?? null }));
},
setItem: async (key, value) => {
if (value == null) {
await getStorageArea().remove(key);
} else {
await getStorageArea().set({ [key]: value });
}
},
setItems: async (values) => {
const map = values.reduce<Record<string, unknown>>(
(map, { key, value }) => {
map[key] = value;
return map;
},
{},
);
await getStorageArea().set(map);
},
removeItem: async (key) => {
await getStorageArea().remove(key);
},
removeItems: async (keys) => {
await getStorageArea().remove(keys);
},
snapshot: async () => {
return await getStorageArea().get();
},
restoreSnapshot: async (data) => {
await getStorageArea().set(data);
},
watch(key, cb) {
const listener = (changes: Storage.StorageAreaOnChangedChangesType) => {
const change = changes[key];
if (change == null) return;
if (dequal(change.newValue, change.oldValue)) return;
cb(change.newValue ?? null, change.oldValue ?? null);
};
getStorageArea().onChanged.addListener(listener);
watchListeners.add(listener);
return () => {
getStorageArea().onChanged.removeListener(listener);
watchListeners.delete(listener);
};
},
unwatch() {
watchListeners.forEach((listener) => {
getStorageArea().onChanged.removeListener(listener);
});
watchListeners.clear();
},
};
}
export interface WxtStorage {
/**
* Get an item from storage, or return `null` if it doesn't exist.
*
* @example
* await storage.getItem<number>("local:installDate");
*/
getItem<T>(key: string, opts?: GetItemOptions<T>): Promise<T | null>;
/**
* Get multiple items from storage. The return order is guaranteed to be the same as the order
* requested.
*
* @example
* await storage.getItems(["local:installDate", "session:someCounter"]);
*/
getItems(
keys: Array<string | { key: string; options?: GetItemOptions<any> }>,
): Promise<Array<{ key: string; value: any }>>;
/**
* Return an object containing metadata about the key. Object is stored at `key + "$"`. If value
* is not an object, it returns an empty object.
*
* @example
* await storage.getMeta("local:installDate");
*/
getMeta<T extends Record<string, unknown>>(key: string): Promise<T>;
/**
* Set a value in storage. Setting a value to `null` or `undefined` is equivalent to calling
* `removeItem`.
*
* @example
* await storage.setItem<number>("local:installDate", Date.now());
*/
setItem<T>(key: string, value: T | null): Promise<void>;
/**
* Set multiple values in storage. If a value is set to `null` or `undefined`, the key is removed.
*
* @example
* await storage.setItem([
* { key: "local:installDate", value: Date.now() },
* { key: "session:someCounter, value: 5 },
* ]);
*/
setItems(values: Array<{ key: string; value: any }>): Promise<void>;
/**
* Sets metadata properties. If some properties are already set, but are not included in the
* `properties` parameter, they will not be removed.
*
* @example
* await storage.setMeta("local:installDate", { appVersion });
*/
setMeta<T extends Record<string, unknown>>(
key: string,
properties: T | null,
): Promise<void>;
/**
* Removes an item from storage.
*
* @example
* await storage.removeItem("local:installDate");
*/
removeItem(key: string, opts?: RemoveItemOptions): Promise<void>;
/**
* Remove a list of keys from storage.
*/
removeItems(
keys: Array<string | { key: string; options?: RemoveItemOptions }>,
): Promise<void>;
/**
* Remove the entire metadata for a key, or specific properties by name.
*
* @example
* // Remove all metadata properties from the item
* await storage.removeMeta("local:installDate");
*
* // Remove only specific the "v" field
* await storage.removeMeta("local:installDate", "v")
*/
removeMeta(key: string, properties?: string | string[]): Promise<void>;
/**
* Return all the items in storage.
*/
snapshot(
base: string,
opts?: SnapshotOptions,
): Promise<Record<string, unknown>>;
/**
* Restores the results of `snapshot`. If new properties have been saved since the snapshot, they are
* not overridden. Only values existing in the snapshot are overridden.
*/
restoreSnapshot(base: string, data: any): Promise<void>;
/**
* Watch for changes to a specific key in storage.
*/
watch<T>(key: string, cb: WatchCallback<T | null>): Unwatch;
/**
* Remove all watch listeners.
*/
unwatch(): void;
/**
* Define a storage item with a default value, type, or versioning.
*
* Read full docs: https://wxt.dev/guide/storage.html#defining-storage-items
*/
defineItem<TValue, TMetadata extends Record<string, unknown> = {}>(
key: string,
): WxtStorageItem<TValue | null, TMetadata>;
defineItem<TValue, TMetadata extends Record<string, unknown> = {}>(
key: string,
options: WxtStorageItemOptions<TValue>,
): WxtStorageItem<TValue, TMetadata>;
}
interface WxtStorageDriver {
getItem<T>(key: string): Promise<T | null>;
getItems(keys: string[]): Promise<{ key: string; value: any }[]>;
setItem<T>(key: string, value: T | null): Promise<void>;
setItems(values: Array<{ key: string; value: any }>): Promise<void>;
removeItem(key: string): Promise<void>;
removeItems(keys: string[]): Promise<void>;
snapshot(): Promise<Record<string, unknown>>;
restoreSnapshot(data: Record<string, unknown>): Promise<void>;
watch<T>(key: string, cb: WatchCallback<T | null>): Unwatch;
unwatch(): void;
}
export interface WxtStorageItem<
TValue,
TMetadata extends Record<string, unknown>,
> {
defaultValue: TValue;
/**
* Get the latest value from storage.
*/
getValue(): Promise<TValue>;
/**
* Get metadata.
*/
getMeta(): Promise<NullablePartial<TMetadata>>;
/**
* Set the value in storage.
*/
setValue(value: TValue): Promise<void>;
/**
* Set metadata properties.
*/
setMeta(properties: NullablePartial<TMetadata>): Promise<void>;
/**
* Remove the value from storage.
*/
removeValue(opts?: RemoveItemOptions): Promise<void>;
/**
* Remove all metadata or certain properties from metadata.
*/
removeMeta(properties?: string[]): Promise<void>;
/**
* Listen for changes to the value in storage.
*/
watch(cb: WatchCallback<TValue>): Unwatch;
/**
* If there are migrations defined on the storage item, migrate to the latest version.
*
* **This function is ran automatically whenever the extension updates**, so you don't have to call it
* manually.
*/
migrate(): Promise<void>;
}
export interface GetItemOptions<T> {
/**
* Value returned from `getValue` when it would otherwise return null.
*/
defaultValue?: T;
}
export interface RemoveItemOptions {
/**
* Optionally remove metadata when deleting a key.
*
* @default false
*/
removeMeta?: boolean;
}
export interface SnapshotOptions {
/**
* Exclude a list of keys. The storage area prefix should be removed since the snapshot is for a
* specific storage area already.
*/
excludeKeys?: string[];
}
export interface WxtStorageItemOptions<T> {
defaultValue: T;
/**
* Provide a version number for the storage item to enable migrations. When changing the version
* in the future, migration functions will be ran on application startup.
*/
version?: number;
/**
* A map of version numbers to the functions used to migrate the data to that version.
*/
migrations?: Record<number, (oldValue: any) => any>;
}
/**
* Same as `Partial`, but includes `| null`. It makes all the properties of an object optional and
* nullable.
*/
export type NullablePartial<T> = {
[key in keyof T]+?: T[key] | undefined | null;
};
/**
* Callback called when a value in storage is changed.
*/
export type WatchCallback<T> = (newValue: T, oldValue: T) => void;
/**
* Call to remove a watch listener
*/
export type Unwatch = () => void;