batchloader - npm Package Compare versions

Comparing version 0.0.4 to 0.0.5

package.json

		{
		"name": "batchloader",
		"version": "0.0.4",
		"version": "0.0.5",
		"description": "BatchLoader is a utility for data fetching layer to reduce requests via batching written in TypeScript. Inspired by Facebook's DataLoader",
		@@ -5,0 +5,0 @@ "main": "lib/index.js",

README.md

		@@ -104,7 +104,8 @@ # BatchLoader

		const usernameLoader = new MappedBatchLoader(
		userLoader, // previously defined loader
		(user) => user && user.username // mapping function
		);
		const getUsername = (user) => user && user.username;

		const usernameLoader = userLoader.mapLoader(getUsername);
		// or
		const usernameLoader = new MappedBatchLoader(userLoader, getUsername);

		// same APIs as BatchLoader
		@@ -118,6 +119,5 @@ const username = await usernameLoader.load(userId);

		const anotherMappedLoader = new MappedBatchLoader(
		usernameLoader, // MappedBatchLoader can be mapped, too.
		...
		);
		const anotherMappedLoader = usernameLoader.mapLoader(mapFn);
		// or
		const anotherMappedLoader = new MappedBatchLoader(usernameLoader, mapFn);
		```
		@@ -124,0 +124,0 @@

src/mappedbatchloader.test.ts

		@@ -86,2 +86,42 @@ import { BatchLoader } from './batchloader';
		});

		test('mapLoader()', async () => {
		const idss = [] as number[][];
		const loader = new BatchLoader(
		(ids: number[]): Promise<number[]> =>
		new Promise(
		(resolve): void => {
		idss.push(ids);
		setTimeout(() => resolve(ids.map((i) => i * 2)), 10);
		}
		),
		String
		)
		.mapLoader((x): Promise<string> => Promise.resolve(String(x)))
		.mapLoader((x) => `${x}${x}`);

		expect(await loader.load(3)).toBe('66');
		expect(await loader.load(4)).toBe('88');
		expect(await loader.load(5)).toBe('1010');

		expect(await loader.loadMany([])).toEqual([]);
		expect(await loader.loadMany([1, 2, 3])).toEqual(['22', '44', '66']);
		expect(await loader.loadMany([1, 2, 3, 2, 3, 2, 1])).toEqual(
		[2, 4, 6, 4, 6, 4, 2].map((x) => `${x}${x}`)
		);

		expect(
		await Promise.all([
		loader.load(1),
		loader.load(2),
		loader.load(3),
		loader.load(2),
		loader.load(1),
		loader.load(2),
		loader.load(3),
		])
		).toEqual([2, 4, 6, 4, 2, 4, 6].map((x) => `${x}${x}`));

		expect(idss).toEqual([[3], [4], [5], [1, 2, 3], [1, 2, 3], [1, 2, 3]]);
		});
		});

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