feature: handle per index meilisearch params

[8byr0]

Pull Request

Related issue

Fixes #1361

What does this PR do?

• Allow configuring meilisearchParams for each index individually (multi search)

From :

const client = instantMeiliSearch(
      "host",
      "key",
      {
        meiliSearchParams: {
          matchingStrategy: MatchingStrategies.ALL,
        },
      },
    ).searchClient;

To :

const client = instantMeiliSearch("host", "key", {
  meiliSearchParams: {
    indexesOverrides: {
      products: { matchingStrategy: MatchingStrategies.ALL },
      categories: { matchingStrategy: MatchingStrategies.LAST },
    },
  },
}).searchClient

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
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Thank you so much for contributing to Meilisearch!

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[8byr0]

My initial proposal in #1364 was to be able to override directly like :

const client = instantMeiliSearch(
      "host",
      "key",
      {
        meiliSearchParams: {
          products: { matchingStrategy: MatchingStrategies.ALL },
          categories: { matchingStrategy: MatchingStrategies.LAST },
        },
      },
    ).searchClient;

Unfortunately as far as I've seen it's not possible using typescript

This one works fine for accessing the values

export type OverridableMeiliSearchSearchParameters = BaseMeiliSearchSearchParameters & {
  [K in Exclude<string, keyof BaseMeiliSearchSearchParameters>]?: BaseMeiliSearchSearchParameters;
};

// No TS errors
const res = myobject[indexName].attributesToRetrieve;

// TS error
const meiliSearchParams: OverridableMeiliSearchSearchParameters = {
      attributesToHighlight: ['movies', 'genres'],
      highlightPreTag: '<em>',
      highlightPostTag: '</em>',
      matchingStrategy: MatchingStrategies.ALL,
    }

This one works fine for declaring values

export type OverridableMeiliSearchSearchParameters =
  | BaseMeiliSearchSearchParameters
  | (BaseMeiliSearchSearchParameters & {
      [K in Exclude<
        string,
        keyof BaseMeiliSearchSearchParameters
      >]?: BaseMeiliSearchSearchParameters
    })

// TS errors
const res = myobject[indexName].attributesToRetrieve;

// No TS errors
const meiliSearchParams: OverridableMeiliSearchSearchParameters = {
      attributesToHighlight: ['movies', 'genres'],
      highlightPreTag: '<em>',
      highlightPostTag: '</em>',
      matchingStrategy: MatchingStrategies.ALL,
    }

Open to discuss it if anyone has another approach in mind