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bs-dataloader
This is a rewrite of dataloader js lib in reasonml for use with BuckleScript. I have a goal to make it work with native OCaml in the future but I still rely on some JavaScript structures.
Usage
module UserLoaderImpl = {
type value = user;
type key = userId;
/* The batchLoadFun needs to wrap the returned values in Js.Result.t so that we can reject each promise instead of all */
let batchLoadFun = userIds => batchGetUsers(userIds);
let options: options = {batch: true, maxBatchSize: 256, cache: true};
};
module UserLoader = DataLoader.Make(UserLoaderImpl);
UserLoader.load("1")
|> Js.Promise.then_(
user => {
displayUser user;
Js.Promise.resolve ();
}
);
/* elsewhere in your app */
UserLoader.load("2")
|> Js.Promise.then_(
user => {
interactWithUser user;
Js.Promsie.resolve();
}
);The example above will load both users at the same time with 1 request. If we later need one of the loaded users again we will get a cached version of the promise, if you need a new version from the server you can clear the key.
updateUser(~userId, ~userPatch)
|> Js.Promise.then_(_ => Js.Promise.resolve(UserLoader.clear userId))
|> Js.Promise.then_(_ => UserLoader.load("1"))
|> Js.Promise.then_(user => {
displayUser user;
Js.Promise.resolve ();
});Development
Build
npm run build
Build + Watch
npm run watch
Test
npm run test
Editor
If you use vscode, Press Windows + Shift + B it will build automatically