src fetchValidatedJson.ts

100% Statements 8/8

100% Branches 2/2

100% Functions 1/1

100% Lines 8/8

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  import type { Struct } from '@metamask/superstruct';
import { assert } from '@metamask/superstruct';
 
/**
 * Load and validate a JSON file
 *
 * @param configUrl - Path to the JSON file
 * @param validator - The validator to use to validate the JSON
 * @returns The validated JSON
 */
export async function fetchValidatedJson<Type>(
  configUrl: string,
  validator: Struct<Type>,
): Promise<Type> {
  try {
    const response = await fetch(configUrl);
    if (!response.ok) {
      throw new Error(
        `Failed to fetch config: ${response.status} ${response.statusText}`,
      );
    }
    const config = await response.json();
    assert(config, validator);
    return config;
  } catch (error) {
    throw new Error(
      `Failed to load config from ${configUrl}: ${String(error)}`,
    );
  }
}