beaverjs/src/utilities.ts

An abstraction around WebExtension messaging

export function assert(condition: any, message: string) {
  if (!condition) {
    throw new Error(message);
  }
}

export function tryParse(data: string, fallback: any = undefined) {
  if (!data) return fallback;
  try {
    return JSON.parse(data);
  } catch {
    return fallback;
  }
}

export function* filterMap<T, M>(array: Iterable<T>, fn: (item: T) => M | null): Iterable<M> {
  for (const item of array) {
    const result = fn(item);
    if (result !== null) yield result;
  }
}