Artillery: Convert YAML scripts to TypeScript/JS

You are converting Artillery YAML test scripts to TypeScript or ESM JavaScript. The conversion is a 1:1 structural mapping — every YAML key maps directly to a JS export. Follow the steps below. Ask the user questions at each decision point marked with DECISION.

Step 1: Find Artillery YAML files

Glob for *.yml and *.yaml files in the project. Identify Artillery scripts by checking for config: and scenarios: as top-level keys. List the files found.

DECISION — If multiple Artillery YAML files exist, ask the user which to convert (or all).

Step 2: Detect output format

DECISION — Determine whether to output TypeScript or ESM JavaScript:

• If tsconfig.json exists, or .ts files are present in test directories → output .ts with type imports
• If the project is plain JS with no TypeScript setup → output .mjs
• If unclear → ask the user

Step 3: Check for YAML anchors and merge keys

Before converting, scan each YAML file for anchors (&name), aliases (*name), and merge keys (<<:). These are YAML-specific features with no JS equivalent.

If found:

1. Still attempt the conversion — resolve anchors/aliases by inlining the referenced values (duplicate the data at each usage site).
2. Add a comment at the top of the output file: // WARNING: This file was converted from YAML that used anchors/merge keys. The shared references have been inlined as duplicated values. Review carefully — the conversion may not be accurate.
3. Warn the user in the output summary which files contained anchors/merge keys and that manual review is needed.

Step 4: Convert each YAML file

For each Artillery YAML file, read it and convert to a JS/TS module. The mapping is purely structural — YAML values become JS object literals 1:1.

Top-level key mapping

Each top-level YAML key becomes a named export: config → export const config = { ... }, scenarios → export const scenarios = [ ... ], before/after → export const before/after = { ... }. before and after have no dedicated Artillery types and are exported untyped.

TypeScript output

Add type imports and annotations for config and scenarios:

import type { Config, Scenario } from "artillery";

export const config: Config = { ... };
export const scenarios: Scenario[] = [ ... ];

ESM JavaScript output

If outputting .mjs, no type imports or annotations — just plain export const.

File placement

Write the new file next to the original YAML file, with the same base name but .ts or .mjs extension.

Conversion example

config:
  target: https://api.example.com
  phases:
    - duration: 60
      arrivalRate: 5
scenarios:
  - name: "Browse products"
    flow:
      - get:
          url: "/products"
          headers:
            Authorization: "Bearer {{ authToken }}"

Becomes:

import type { Config, Scenario } from "artillery";

export const config: Config = {
  target: "https://api.example.com",
  phases: [{ duration: 60, arrivalRate: 5 }],
};

export const scenarios: Scenario[] = [
  {
    name: "Browse products",
    flow: [{ get: { url: "/products", headers: { Authorization: "Bearer {{ authToken }}" } } }],
  },
];

Note: Artillery template expressions like {{ authToken }} stay as literal strings. The processor field (if present) is also kept as-is (string reference).

Step 5: Verify

Try to verify the converted file:

2. If TypeScript: run npx tsc --noEmit <file> to type-check
3. If .mjs: run node --check <file> to syntax-check
4. If none of the above work: skip verification and tell the user to verify manually

Step 6: Output summary

Tell the user:

• Which files were converted and where the new files are
• The run command: npx artillery run ./path/to/new-file.ts (or .mjs)
• Original YAML files were left untouched — the user can delete them manually if desired