Package Exports

@lyrasearch/lyra
@lyrasearch/lyra/dist/cjs/lyra.js
@lyrasearch/lyra/dist/esm/lyra.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@lyrasearch/lyra) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Try the live demo

Installation

You can install Lyra using npm, yarn, pnpm:

npm i @lyrasearch/lyra

yarn add @lyrasearch/lyra

pnpm add @lyrasearch/lyra

Usage

Lyra is quite simple to use. The first thing to do is to create a new database instance and set an indexing schema:

import { create, insert, remove, search } from "@lyrasearch/lyra";

const db = create({
  schema: {
    author: "string",
    quote: "string",
  },
});

Lyra will only index string properties, but will allow you to set and store additional data if needed.

Once the db instance is created, you can start adding some documents:

insert(db, {
  quote:
    "It is during our darkest moments that we must focus to see the light.",
  author: "Aristotle",
});

insert(db, {
  quote:
    "If you really look closely, most overnight successes took a long time.",
  author: "Steve Jobs",
});

insert(db, {
  quote:
    "If you are not willing to risk the usual, you will have to settle for the ordinary.",
  author: "Jim Rohn",
});

insert(db, {
  quote: "You miss 100% of the shots you don't take",
  author: "Wayne Gretzky - Michael Scott",
});

Please note that the insert function is synchronous. If you have a large number of documents, we highly recommend using the insertBatch function instead, which prevents the event loop from blocking. This operation is asynchronous and returns a promise:

await insertBatch(db, [
  {
    quote:
      "It is during our darkest moments that we must focus to see the light.",
    author: "Aristotle",
  },
  {
    quote:
      "If you really look closely, most overnight successes took a long time.",
    author: "Steve Jobs",
  },
  {
    quote:
      "If you are not willing to risk the usual, you will have to settle for the ordinary.",
    author: "Jim Rohn",
  },
  {
    quote: "You miss 100% of the shots you don't take",
    author: "Wayne Gretzky - Michael Scott",
  },
]);

After the data has been inserted, you can finally start to query the database.

const searchResult = search(db, {
  term: "if",
  properties: "*",
});

In the case above, you will be searching for all the documents containing the word if, looking up in every schema property (AKA index):

{
  elapsed: 99, // elapsed time is in microseconds
  hits: [
    {
      id: 'ckAOPGTA5qLXx0MgNr1Zy',
      quote: 'If you really look closely, most overnight successes took a long time.',
      author: 'Steve Jobs'
    },
    {
      id: 'fyl-_1veP78IO-wszP86Z',
      quote: 'If you are not willing to risk the usual, you will have to settle for the ordinary.',
      author: 'Jim Rohn'
    }
  ],
  count: 2
}

You can also restrict the lookup to a specific property:

const searchResult = search(db, {
  term: "Michael",
  properties: ["author"],
});

Result:

{
  elapsed: 111,
  hits: [
    {
      id: 'L1tpqQxc0c2djrSN2a6TJ',
      quote: "You miss 100% of the shots you don't take",
      author: 'Wayne Gretzky - Michael Scott'
    }
  ],
  count: 1
}

If needed, you can also delete a given document by using the remove method:

remove(db, "L1tpqQxc0c2djrSN2a6TJ");

Hooks

When dealing with asynchronous operations, hooks are an excelent mechanism to intercept and perform operations during the workflow. Lyra supports hooks natively. The create function allows you to specific a sequence of hooks.

import { create } from "@lyrasearch/lyra";

const db = create({
  schema: {},
  hooks: {
    // HERE
  },
});

Important: The hooks run in the same context as the main function execution. It means, that if your hook takes X milliseconds to resolve, the Lyra function will take X + Y (where Y = Lyra operation).

afterInsert hook

The afterInsert hook is called after the insertion of a document into the database. The hook will be called with the id of the inserted document.

Example:

import { create, insertWithHooks } from "@lyrasearch/lyra";

async function hook1 (id: string): Promise<void> {
  // called before hook2
}

function hook2 (id: string): void {
  // ...
}

const db = create({
  schema: {
    author: "string",
    quote: "string",
  },
  hooks: {
    afterInsert: [hook1, hook2],
  },
});

await insertWithHooks(db, { author: "test", quote: "test" })

License

Lyra is licensed under the Apache 2.0 license.