Twitter Typeahead - Troubleshooting Bloodhound Issue in TypeScript

I have been trying to implement the pre-fetch feature from Typeahead's website using Typescript.

After including the typeahead.d.ts file, everything seems to be fine until I attempt to use a Bloodhound instance as the dataset source.

The original example code looks like this:

var countries = new Bloodhound({
  datumTokenizer: Bloodhound.tokenizers.whitespace,
  queryTokenizer: Bloodhound.tokenizers.whitespace,
  prefetch: '../data/countries.json'
});

$('#prefetch .typeahead').typeahead(null, {
  name: 'countries',
  source: countries
});

In my Typescript conversion, it appears as follows:

// Configuration for employee search box
var emps = new Bloodhound({
  datumTokenizer: Bloodhound.tokenizers.whitespace,
  queryTokenizer: Bloodhound.tokenizers.whitespace,
  prefetch: { url: prefetchUrl }
});

$("#employee").typeahead(null, {
  name: "emps",
  source: emps
});

However, I encounter an error message which states:

Argument of type '{ name: string; source: Bloodhound<{}>; }' is not assignable to parameter of type 'Dataset'.

Types of property 'source' are incompatible.

Type 'Bloodhound<{}>' is not assignable to type '(query: string, cb: (result: any) => void) => void'.

If anyone can guide me on correcting my translation or modifying the d.ts file for successful compilation, I would greatly appreciate it.

Although the JavaScript functionality works perfectly fine, these Typescript errors are hindering the build process of my project.

Thank you!

Answer №1

When assigning a source to be a DataSet, the definition is as follows:

source: (query: string, cb: (result: any) => void) => void;

You are attempting to pass it the type of a Bloodhound object.

It seems like there may have been an update to the actual API or the d.ts file might be outdated.

Upon further investigation into the project's source code, it seems that the library does accept a Bloodhound object for the source...

// use duck typing to see if source is a bloodhound instance by checking
// for the __ttAdapter property; otherwise assume it is a function
this.source = o.source.__ttAdapter ? o.source.__ttAdapter() : o.source;

Reference

In light of this, I would recommend updating the d.ts on definitely typed either through a pull request or by reaching out to the authors directly.

Edit

A potential update to the d.ts could be:

source: (query: string, cb: (result: any) => void) => void | Bloodhound;

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