lyra - ? Fast, in-memory, typo-tolerant, full-text search engine written in TypeScript.

Created at: 2022-05-10 20:01:50
Language: TypeScript
License: NOASSERTION

Lyra

Tests

Try the live demo

Installation

You can install Lyra using npm, yarn, pnpm:

npm i @nearform/lyra
yarn add @nearform/lyra
pnpm add @nearform/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, search, remove } from '@nearform/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'
});

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');

License

Lyra is licensed under the Apache 2.0 license.