data-test-api

API to expose test data in a convenient and consistent way

Installation

npm install -D data-test-api
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Usage

Api Reference: https://cheminfo.github.io/data-test-api/

Package exposing files

// src/index.ts

import { join } from 'node:path';

import type { AbsolutePath } from 'data-test-api';
import init from 'data-test-api';

const zipFilesApi = init(
  join(import.meta.dirname, '../data/zipped') as AbsolutePath,
  (dirent) => dirent.isFile() && dirent.name.endsWith('.zip'),
);

const flatFilesApi = init(join(import.meta.dirname, '../data/flat'));

export { zipFilesApi, flatFilesApi };
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Using the API

import { join } from 'node:path';

import type { AbsolutePath } from 'data-test-api';
import init from 'data-test-api';

const api = init(join(import.meta.dirname, '../data') as AbsolutePath);

const root = api.root;
const filePath = api.getPath('relative/path/to/file.txt');
// .getPath('./relative/path/to/file.txt') // also works
// .getPath('../data/relative/path/to/file.txt') // also works
// .getPath('/absolute/path') // typecheck error, absolute paths are not allowed

const fileByPath = await api.getFile('relative/path/to/file.txt'); // fulfill a FileEntry or reject a FileNotExistsError
const fileByPathBuffer = await fileByPath.buffer();
const fileByPathStream = await fileByPath.stream();

const fileByName = await api.findFile('file.txt'); // fulfill a FileEntry or reject a FileNotFoundError
const fileByNameBuffer = await fileByPath.buffer();
const fileByNameStream = await fileByPath.stream();

// async iteration on files
for await (const file of api.filesAsyncValues()) {
  const buffer = await file.buffer();
  console.log(file.path, buffer.toString());
}

// iteration on files
const values = await api.filesValues();
for (const file of values) {
  console.log(file.path);
}
// you can also use Iterator helpers if you use Node >= 22
// and add "ESNext.Iterator" to your tsconfig.json `compilerOptions.lib`

// array of files
const files = await api.files();

// get buffer with relative path
const bufferByPath = await api.getData('relative/path/to/file.txt');
const bufferByName = await api.findData('file.txt');
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FileEntry interface

https://cheminfo.github.io/data-test-api/interfaces/FileEntry.html

Extends the API

NB: default export of data-test-api is an alias for new DataTestApi(root, filter).

import { join } from 'node:path';

import { DataTestApi } from 'data-test-api';

export class JdxDataTestApi extends DataTestApi {
  constructor() {
    super(
      join(import.meta.dirname, '../data/jdx'),
      (dirent) => dirent.isFile() && dirent.name.endsWith('.jdx'),
    );
  }

  // you can override methods or add new ones
}
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Working relatively with working directory

// ls-recursive.js

import init from 'data-test-api';
const api = init('./', () => true);

for await (const file of api.filesAsyncValues()) {
  console.log(file.path); // path is relative to cwd
}
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