Add more documentation about completion/link/filter to README

[rouilj]

I want to use a tagging component for adding keywords to an item. There can be thousands of keywords,
so I want to have:

• the user start typing a matching keyword
• perform a query, using the currently typed match, to a web server after a short delay
• get a json response with suitable matches
• allow the user to choose a match

Thanks.

[jcubic]

Look at the signature of completion:

completion {list: string[] | function(): Promise(string[])|string[], delay: miliseconds, min_length: number}

This is pseudo TypeScript.

You can use:

var tags = tagger(input, {
    completion: {
        list(str) {
            return fetch(`/api/completion?text=${str}`).then(res => res.json());
        },
        delay: 500,
        min_length: 2
    }
});

There is only missing argument to the function in README.

[jcubic]

I've added some documentation to the demo. There is also a need to add some docs to README.

[rouilj]

Typescript signatures aren't my thing. I assume the signature should be interpreted as:
a function that takes (a currently undocumented) string argument and returns either a
Promise that resolves to a list/array of strings, or returns a list/array of strings directly.
Am I interpreting that correctly?

In my case I guess I would need to create a new Promise that wraps the fetch and changes
the shape of res.json to return a list of strings as the returned value from the search (for first) looks like:

{
    "data": {
        "collection": [
            {
                "id": "3",
                "link": "https://endpoint.example.com/ep/rest/data/keyword/3",
                "name": "First Time Failure"
            }
        ],
        "@total_size": 1
    }
}

[jcubic]

Yes, exactly.