🪵 Logtail - Shared TypeScript types

New to Logtail? Here's a low-down on logging in JavaScript.

@logtail/types

The Logtail JS library packages are written in TypeScript.

Various types are shared between multiple packages. Those shared types have been separated out into their own package, to make it easier for importing.

That's what you'll find in this package.

Importing types

You can import a shared type into a TypeScript project by importing directly from this package:

// For example, `ILogtailLog`
import { ILogtailLog } from "@logtail/types";

Types

ILogtailOptions

Config options for the Logtail Base class for creating a Logtail client instance.

export interface ILogtailOptions {
  /**
   * Endpoint URL for syncing logs with Logtail.com
   */
  endpoint: string;

  /**
   * Maximum number of logs to sync in a single request to Logtail.com
   */
  batchSize: number;

  /**
   * Max interval (in milliseconds) before a batch of logs proceeds to syncing
   */
  batchInterval: number;

  /**
   * Maximum number of sync requests to make concurrently (useful to limit
   * network I/O)
   */
  syncMax: number;

  /**
   * Boolean to specify whether thrown errors/failed logs should be ignored
   */
  ignoreExceptions: boolean;
}

LogLevel

Enum representing a log level between debug -> error:

enum LogLevel {
  Debug = "debug",
  Info = "info",
  Warn = "warn",
  Error = "error",
}

Context

You can add meta information to your logs by adding a string, boolean, Date or number to a string field (or any nested object containing fields of the same.)

We call this 'context' and these are the types:

/**
 * Context type - a string/number/bool/Date, or a nested object of the same
 */
export type ContextKey = string | number | boolean | Date;
export type Context = { [key: string]: ContextKey | Context };

ILogtailLog

The log object which is implicitly created by calling .log() (or any explicit log level function - e.g. .info()), and is passed down the chain for Logtail middleware before syncing with Logtail.com

interface ILogtailLog {
  dt: Date;
  level: LogLevel; // <-- see `LogLevel` above
  message: string;
  [key: string]: ContextKey | Context; // <-- see `Context` above
}

Middleware

A type representing a Middleware function passed to .use() (or .remove())

type Middleware = (log: ILogtailLog) => Promise<ILogtailLog>;

Sync

The type of the function passed to .setSync(), for syncing a log with Logtail.com:

Note: Differs from the Middleware type because it receives - and resolves to a Promise of - an array of batched ILogtailLog.

Sync = (logs: ILogtailLog[]) => Promise<ILogtailLog[]>

LICENSE

ISC