import { safeStringify } from "@superglue/shared";
export const DEFAULT_MAX_DOWNLOAD_BYTES = 1000 * 1024 * 1024; // 1000 MB
export function downloadJson(
data: any,
filename: string,
options?: {
maxBytes?: number;
onTooLarge?: (bytes: number) => void;
onError?: (error: Error) => void;
},
): void {
try {
if (data === undefined) {
throw new Error("No data to download");
}
const maxBytes = options?.maxBytes ?? DEFAULT_MAX_DOWNLOAD_BYTES;
const jsonString = typeof data === "string" ? data : safeStringify(data);
const byteLength =
typeof window !== "undefined" && "TextEncoder" in window
? new TextEncoder().encode(jsonString).length
: jsonString.length; // fallback approximation
if (byteLength > maxBytes) {
if (options?.onTooLarge) {
options.onTooLarge(byteLength);
} else {
console.warn(
`downloadJson aborted: payload too large (${byteLength.toLocaleString()} bytes)`,
);
if (typeof window !== "undefined") {
alert("Download aborted: data is too large to download safely in the browser.");
}
}
return;
}
const blob = new Blob([jsonString], { type: "application/json" });
const url = URL.createObjectURL(blob);
const link = document.createElement("a");
link.href = url;
link.download = filename;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
URL.revokeObjectURL(url);
} catch (error) {
if (options?.onError && error instanceof Error) {
options.onError(error);
} else {
console.error("downloadJson error", error);
}
}
}
export function formatJsonFilename(
baseFilename: string,
includeTimestamp: boolean = false,
): string {
if (includeTimestamp) {
const timestamp = new Date().toISOString().replace(/[:.]/g, "-").slice(0, -5);
return `${baseFilename}_${timestamp}.json`;
}
return `${baseFilename}.json`;
}
