| 1 | /** |
| 2 | * Errors grouped: the same exception thrown a thousand times is one group |
| 3 | * with a count, not a thousand lines. What makes two the same is their |
| 4 | * name, their message with the parts that change taken out (numbers, ids, |
| 5 | * quoted values), and where they were thrown (the top frame of the stack, |
| 6 | * its file and function, not its line, which moves with every change). |
| 7 | */ |
| 8 | |
| 9 | /** The message with what varies between occurrences taken out. */ |
| 10 | export function messageShape(message: string): string { |
| 11 | return message |
| 12 | .replace(/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/gi, "<id>") |
| 13 | .replace(/\b[0-9a-f]{12,}\b/gi, "<id>") |
| 14 | .replace(/(["'`])(?:(?!\1).){0,200}\1/g, "$1…$1") |
| 15 | .replace(/https?:\/\/\S+/g, "<url>") |
| 16 | .replace(/\d+(\.\d+)?/g, "#") |
| 17 | .replace(/\s+/g, " ") |
| 18 | .trim() |
| 19 | .slice(0, 300); |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * The top frame that is the app's own: its function and file, without |
| 24 | * line, column or a build's hash. Frames of the runtime and of |
| 25 | * node_modules are skipped while there is another. |
| 26 | */ |
| 27 | export function topFrame(stack: string | null | undefined): string { |
| 28 | if (!stack) return ""; |
| 29 | const frames = stack |
| 30 | .split("\n") |
| 31 | .map((line) => line.trim()) |
| 32 | .filter((line) => line.startsWith("at ") || /@.+:\d+/.test(line)); |
| 33 | const own = frames.find((f) => !/node_modules|node:|internal\/|<anonymous>|native/.test(f)) ?? frames[0] ?? ""; |
| 34 | return own |
| 35 | .replace(/:\d+(:\d+)?\)?$/, "") |
| 36 | .replace(/[.-][0-9a-f]{6,}(?=\.\w+$)/i, "") |
| 37 | .replace(/\(|\)/g, "") |
| 38 | .replace(/^at /, "") |
| 39 | .slice(0, 300); |
| 40 | } |
| 41 | |
| 42 | export async function fingerprint(name: string, message: string, stack: string | null | undefined, service: string): Promise<string> { |
| 43 | const key = [service, name, messageShape(message), topFrame(stack)].join("\u0000"); |
| 44 | const digest = await crypto.subtle.digest("SHA-256", new TextEncoder().encode(key)); |
| 45 | return [...new Uint8Array(digest).slice(0, 8)].map((b) => b.toString(16).padStart(2, "0")).join(""); |
| 46 | } |