gfmjs

gfmjs is a JavaScript test runner for GitHub Flavored Markdown files. It extracts JavaScript code blocks, transforms // => expected style comments into actual assertions, and executes the code, reporting syntax errors, runtime errors, and failed assertions.

Inspired by jsmd.

features

Single-line // => expected and Block/Multi-line comments /* => expected */. are supported. Newlines, extra lines, and spaces are fine.

const x = 123

x // => 123

x
// => 123

x
/*
	=>
		123
*/

Any expression should work as an expected value.

const expected = [ 1, 2, 3 ]
const foo = value => {
	value // => expected.shift()
}
foo(1)
foo(2)
foo(3)

It has a sourcemap back to the original markdown file so errors should include the original location.

As of v2, code will be interpreted as an ES module entrypoint, so use import rather than require. Use createRequire if needed.

usage

$ gfmjs ./README.md

# write the javascript bundle to a file
$ gfmjs -o ./build/README.js ./README.md

Code blocks that are tagged as js or javascript will be evaluated.

```js
	// code here
```
```javascript
	// code here
```

You can also make hidden code blocks that will be evaluated by using html comments tagged in the same manner:

<!--js
	// code here
-->

If you want to write visible javascript code blocks that won't be evaluated but will be styled, tag them as node:

```node
	// code here
```