JavaScript Playgrounds
The playground can now handle JavaScript files.
It's quite reasonable to wonder why we would add support
for JavaScript in the playground, but it's likely that the
majority of TypeScript's users are using JavaScript.
TypeScript can use inferred types, type acquisition and
JSDoc support in a JavaScript file to provide a great
tooling environment:
example:objects-and-arrays
example:automatic-type-acquisition
example:jsdoc-support
The playground supporting JavaScript means that you
can learn and walk people through complicated JSDoc
examples, or debug issues when there are expectation
mis-matches.
For example, how come this JSDoc comment isn't typed
correctly?
/**
* Adds two numbers together
* @param {number} The first number
* @param {number} The second number
* @returns {number}
*/
function addTwoNumbers(a, b) {
return a + b;
}