@savvy-web/bun-builder

Build TypeScript libraries in milliseconds with Bun's native bundler. Automatic entry detection from package.json, rolled-up .d.ts declarations, and catalog:/workspace: resolution for monorepo publishing -- zero configuration required.

Features

• Sub-Second Builds -- Bun's native bundler for fast iteration cycles
• Zero Configuration -- Auto-detects entry points from package.json exports
• Bundled or Bundleless -- Single-file bundles with rolled-up .d.ts, or preserve source structure with raw declarations
• TSDoc Warnings -- API Extractor TSDoc warnings reported with source locations; configurable severity
• Catalog Resolution -- Resolves Bun catalog: and workspace: protocols for npm publishing
• Multi-Target Publishing -- Single config produces dev and npm builds; all artifacts are copied to each publishConfig.targets directory

Installation

bun add -D @savvy-web/bun-builder

Peer Dependencies

bun add -D @microsoft/api-extractor @typescript/native-preview typescript @types/bun

Quick Start

Create a bun.config.ts file in your project root:

import { BunLibraryBuilder } from '@savvy-web/bun-builder';

export default BunLibraryBuilder.create({});

Run the build:

bun run bun.config.ts                  # Build all targets
bun run bun.config.ts --env-mode dev   # Dev build only
bun run bun.config.ts --env-mode npm   # npm build only

Defaults

The builder ships with sensible defaults -- most projects need no configuration:

| Option | Default | Description | | --- | --- | --- | | bundle | true | Bundled output with rolled-up .d.ts via API Extractor | | splitting | true (multi-entry) / false (single-entry) | Code splitting for shared modules between entry points | | apiModel | true | API model generation for the npm target | | tsdoc.warnings | "fail" (CI) / "log" (local) | TSDoc warning severity |

Bundleless Mode

Set bundle: false to preserve the source directory structure in output. Files are compiled individually instead of bundled, and raw .d.ts files are emitted directly (no DTS rollup). API model generation still works if enabled. Test files (.test.ts, .spec.ts) and __test__/__tests__ directories are automatically excluded from declaration output via import graph analysis.

import { BunLibraryBuilder } from '@savvy-web/bun-builder';

export default BunLibraryBuilder.create({
  bundle: false,
});

TSDoc Warnings

API Extractor TSDoc warnings are collected and reported with source file and line information. Control the behavior with the tsdoc.warnings option:

import { BunLibraryBuilder } from '@savvy-web/bun-builder';

export default BunLibraryBuilder.create({
  apiModel: {
    tsdoc: {
      warnings: 'fail',  // 'fail' | 'log' | 'none'
    },
  },
});

• "fail" -- Fail the build on TSDoc warnings (default in CI)
• "log" -- Log warnings but continue (default locally)
• "none" -- Suppress warnings entirely

For fine-grained control, use suppressWarnings to silence specific messages:

export default BunLibraryBuilder.create({
  apiModel: {
    suppressWarnings: [
      { messageId: 'ae-forgotten-export', pattern: '_InternalHelper' },
      { pattern: '^Analysis will use' },
    ],
  },
});

TypeScript Configuration

The package includes a base tsconfig optimized for ESM library builds:

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "extends": "@savvy-web/bun-builder/tsconfig/ecma/lib.json"
}

Documentation

For configuration options, API reference, and advanced usage:

• Configuration Reference -- Complete options documentation
• Package.json Transformation -- Export and dependency transforms
• Declaration Bundling -- TypeScript declaration generation
• Advanced Usage -- Programmatic API and custom pipelines

Contributing

See CONTRIBUTING.md for development setup and guidelines.

License

MIT