How to use the expo-task-manager.isTaskDefined function in expo-task-manager
To help you get started, we’ve selected a few expo-task-manager examples, based on popular ways it is used in public projects.
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expo / expo / packages / expo-background-fetch / src / BackgroundFetch.ts View on Github 
export async function registerTaskAsync(taskName: string, options: BackgroundFetchOptions = {}): Promise {
if (!ExpoBackgroundFetch.registerTaskAsync) {
throw new UnavailabilityError('BackgroundFetch', 'registerTaskAsync')
}
if (!TaskManager.isTaskDefined(taskName)) {
throw new Error(
`Task '${taskName}' is not defined. You must define a task using TaskManager.defineTask before registering.`
);
}
await ExpoBackgroundFetch.registerTaskAsync(taskName, options);
}export async function registerTaskAsync(taskName, options = {}) {
if (!ExpoBackgroundFetch.registerTaskAsync) {
throw new UnavailabilityError('BackgroundFetch', 'registerTaskAsync');
}
if (!TaskManager.isTaskDefined(taskName)) {
throw new Error(`Task '${taskName}' is not defined. You must define a task using TaskManager.defineTask before registering.`);
}
await ExpoBackgroundFetch.registerTaskAsync(taskName, options);
}
export async function unregisterTaskAsync(taskName) {export async function registerTaskAsync(taskName: string, options: BackgroundFetchOptions = {}): Promise {
if (!ExpoBackgroundFetch.registerTaskAsync) {
throw new UnavailabilityError('BackgroundFetch', 'registerTaskAsync')
}
if (!TaskManager.isTaskDefined(taskName)) {
throw new Error(
`Task '${taskName}' is not defined. You must define a task using TaskManager.defineTask before registering.`
);
}
await ExpoBackgroundFetch.registerTaskAsync(taskName, options);
}export async function registerTaskAsync(taskName, options = {}) {
if (!ExpoBackgroundFetch.registerTaskAsync) {
throw new UnavailabilityError('BackgroundFetch', 'registerTaskAsync');
}
if (!TaskManager.isTaskDefined(taskName)) {
throw new Error(`Task '${taskName}' is not defined. You must define a task using TaskManager.defineTask before registering.`);
}
await ExpoBackgroundFetch.registerTaskAsync(taskName, options);
}
export async function unregisterTaskAsync(taskName) {expo-task-manager
Expo module that provides support for tasks that can run in the background.
