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Showing content from https://grafana.com/docs/k6/latest/using-k6/javascript-typescript-compatibility-mode/ below:

JavaScript and TypeScript compatibility mode

Open source

Note

If you’re using k6 v0.53 or higher, the compatibility mode feature doesn’t have much impact on the k6 default behavior. Refer to this GitHub issue for more details.

Starting on k6 v0.57, TypeScript support is enabled by default, and the experimental-enhanced-mode option has been removed.

k6 offers two JavaScript compatibility modes:

• Base mode: Only uses native support in k6 and the underlying JavaScript runtime. For k6 v0.53.0 or higher, it has the same functionality as extended apart from the global aliasing.
• Extended mode: Similar to base mode, with an additional alias from global to globalThis for Node.js compatibility. This is the default mode.

After k6 v0.53.0, the only difference between the base and extended modes is that global, the Node.js global variable, is aliased to the value of globalThis.

When running tests, you can change the mode by using the --compatibility-mode option:

By default, k6 uses the --compatibility-mode=extended mode:

k6 run --compatibility-mode=base script.js

K6_COMPATIBILITY_MODE=base k6 run script.js

k6 uses esbuild to transpile TypeScript (TS) code for all files that have the .ts extension.

TypeScript support is partial as it strips the type information but doesn’t provide type safety.

const http = require('k6/http');
const k6 = require('k6');

module.exports.options = {
  vus: 10,
  duration: '30s',
};

module.exports.default = function () {
  http.get('http://test.k6.io');
  k6.sleep(1);
};

⚠️ About require()

Note that require() is a custom k6 implementation of module loading, which doesn’t behave in the same way as the require() call in Node.js. Specifically, it only handles loading of built-in k6 modules, scripts on the local filesystem, and remote scripts over HTTP(S), but it does not support the Node.js module resolution algorithm.

The examples below demonstrate the use of Babel with bundlers like Webpack and Rollup:

• k6-template-es6: Template using Webpack and Babel to bundle k6 tests.
• k6-rollup-example: Example using Rollup and Babel to bundle a testing project.

• Running large tests: Optimize k6 for better performance.
• k6 Modules: Different options to import modules in k6.
• k6 Archive Command: The k6 archive command bundles all k6 test dependencies into a tar file, which can then be used for execution. It may also reduce the execution startup time.

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