bitumen
v3.1.0
Published
A collection of utilities, types, and opinionated configuration for Babel, ESLint, Rollup, TypeScript, and Vitest.
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Overview
bitumen
is a collection of utilities, types, and opinionated configuration for Babel, ESLint, Rollup, TypeScript, and Vitest.
Supported Environments
- Client side: Last two versions of Chrome, Edge, Firefox (+ ESR), and Safari
- Server side: Maintained versions of Node.js
Usage
Configuration
Babel
- Targets maintained versions of Node.js and the last two versions of Chrome, Edge, Firefox (+ ESR), and Safari;
- transpiles TypeScript to JavaScript and rewrites import extensions
.?(c|m)ts?(x)
→.?(c|m)js
; - preserves ECMAScript modules (i.e. no CommonJS conversion); and
- enables support for import attributes.
Option 1: 📍 package.json
{
"babel": {
"extends": "bitumen/configuration/babel"
}
}
Option 2: 📍 babel.config.js
import base from 'bitumen/configuration/babel';
export default {
...base,
// custom configuration and overrides
};
ESLint
Configuration for JavaScript, TypeScript, and optionally React, based on:
| Plugin | Preset(s) |
| --- | --- |
| @eslint/js
| recommended
|
| @typescript-eslint
| strict-type-checked
, stylistic-type-checked
|
| eslint-plugin-import-x
| recommended
, typescript
|
| eslint-plugin-react
| all
|
| eslint-plugin-react-hooks
| recommended
|
📍 .eslintrc.cjs
const base = require('bitumen/configuration/eslint');
const react = require('bitumen/configuration/eslint-react');
/** @type {import('eslint').Linter.Config} */
module.exports = {
...base,
...react,
// custom configuration and overrides
};
Rollup
📍 rollup.config.js
import configure from 'bitumen/configuration/rollup';
import packageJson from './package.json';
export default configure(packageJson);
configure()
returns a configuration object which:
- Reads entry points from
package.json
'sexports
field (no conditionals, null targets, or patterns). - Writes distributable output to
DIST_PATH
, mirroring the directory structure ofBUILD_PATH
. - Writes CommonJS modules to
.cjs
files and ES modules to.js
files. - Excludes test directories
__mocks__
,__tests__
from the output. - Copies Sass stylesheets (
.scss
) fromSRC_PATH
toDIST_PATH
. - Copies TypeScript type declarations (
.d.ts
) fromBUILD_PATH
toDIST_PATH
, giving them a.d.ts
extension for ESM and a.d.cts
extension for CommonJS.
The following environment variables must be set at runtime:
BUILD_PATH
: Where Babel andtsc
output files can be found.DIST_PATH
: Where Rollup is to write its distributable output.FORMAT
: Type of modules to output; either 'es' (ESM) or 'cjs' (CommonJS).SRC_PATH
: Where the original source code is located.
TypeScript
📍 tsconfig.json
{
"extends": "bitumen/configuration/typescript",
// custom configuration and overrides
}
Vitest
- Automatically clears mocks after each test,
- enables globals for automatic DOM clean-up between UI tests,
- looks for tests and mocks under
./src
, - requires 100%
istanbul
coverage, - turns off watch mode by default, and
- uses thread workers for reduced overhead.
📍 vitest.config.js
import base from 'bitumen/configuration/vitest';
/** @type {import('vitest/config').UserConfig} */
export default {
...base,
// custom configuration and overrides
};
Library
bitumen
exposes named exports from the following entry points:
collections
configuration
mixins
types
utils
For example, to implement SortedSet
from collections
:
import {SortedSet} from 'bitumen/collections';
const set = new SortedSet();
Type Declarations
For proper module and type resolution, set option compilerOptions.module
to 'NodeNext' in jsconfig.json
or tsconfig.json
.
💡 bitumen
's TypeScript configuration is already set up this way.