Typescript
Typescript is a very popular compiler that allows developers to use modern ES6 features as well as a very mature typing system. The benefits are so great that it has become of the first presets supported by the just-task-preset library.
Given a library with Typescript source code, it might be desirable to have multiple output formats for different audiences. By default, the tscTask() function looks for the tsconfig.json present in the project root. The preset higher order function can take in an option that overrides compilation options. The Typescript compiler options are passed to the tsc.js script.
A list of available options are located at the Typescript documentation site. The options passed into the preset function will be passed in as command line arguments as a string.
// just-task.js
import { tscTask } from 'just-task-preset';
task('ts', tscTask());
For variety, try having two kinds of output at the same time (built in parallel)
// just-task.js
import { parallel } from 'just-task';
import { tscTask } from 'just-task-preset';
task('ts:commonjs', tscTask({ module: 'commonjs' }));
task('ts:esnext', tscTask({ module: 'esnext' }));
task('ts', parallel('ts:commonjs', 'ts:esnext'));
Next Steps
Learn about the Jest preset