Implementation:Promptfoo Promptfoo Version Constants

Knowledge Sources	Promptfoo_Promptfoo
Domains	Build_System, Constants
Last Updated	2026-02-14 07:45 GMT

Overview

Compile-time constants module exporting the application version and PostHog analytics key, injected during the build process.

Description

The Version_Constants module (version.ts) exports two compile-time constants: VERSION (the package version from package.json, injected by tsdown's define option at build time or read from npm_package_version in development) and POSTHOG_KEY (the PostHog analytics key, populated only in production builds). These constants are used throughout the application for version reporting, telemetry, and update checking.

Usage

Import VERSION wherever the application version is needed (telemetry, update checks, API headers, CLI output). POSTHOG_KEY is used only by the telemetry module.

Code Reference

Source Location

• Repository: Promptfoo_Promptfoo
• File: src/version.ts
• Lines: 1-34

Signature

export const VERSION: string
export const POSTHOG_KEY: string

Import

import { VERSION, POSTHOG_KEY } from './version';
// Or via re-export:
import { VERSION } from './constants';

I/O Contract

Inputs

Name	Type	Required	Description
(none)	—	—	Compile-time injected values

Outputs

Name	Type	Description
VERSION	string	Application version (e.g., "0.120.24")
POSTHOG_KEY	string	PostHog analytics key (empty in development)

Usage Examples

import { VERSION } from './version';

console.log(`promptfoo v${VERSION}`);
// Output: "promptfoo v0.120.24"

Related Pages

• Environment:Promptfoo_Promptfoo_Node_Runtime