Typescript compile issue with addField

[figelwump]

I'm using elasticlunr in a typescript project. I get the following typescript compiler error when using addField:

[0] Argument of type '"url"' is not assignable to parameter of type 'never'.  TS2345

The code:

            let elasticLunrIndex = elasticlunr(function () {
                this.addField('url');
            });

I made sure all strict checking is turned off in tsconfig.json. I can workaround it for now by casting the string to never (whatever that means) like so:

            let elasticLunrIndex = elasticlunr(function () {
                this.addField('url' as never);
            });

[sebastiansandqvist]

Looking at the typings for elasticlunr it looks like there's a constructor argument that determines what strings are valid to pass to this.addField.

So to fix your problem:

interface Foo {
  url: string;
}

let elasticLunrIndex = elasticlunr<Foo>(function () {
  this.addField('url');
});

[larrystone]

Also check out a more relaxed approach here