{"id":15589,"library":"declaration-bundler-webpack4-plugin","title":"Webpack 4 Declaration Bundler Plugin","description":"This library, `declaration-bundler-webpack4-plugin`, bundles individual TypeScript declaration files (`.d.ts`) generated during the Webpack build process into a single, combined declaration file. It achieves this by re-composing the declarations as if all classes and interfaces were defined as internal modules within a specified `moduleName`. This makes the plugin particularly relevant for niche scenarios where classes and interfaces are deliberately exposed to a global module space, allowing for runtime access patterns that mimic internal TypeScript modules, often mapping prefixed URIs (like `foaf:Image`) back to module paths (e.g., `my.modules.rdfs.Image`). The current version is 1.0.6-beta.2. Given its beta status, the last commit dating back to early 2020, and its explicit tie to Webpack 4 (which is no longer the current major version of Webpack), its release cadence is effectively stalled, indicating it is no longer actively maintained. Its key differentiator is this unique, somewhat opinionated, approach to declaration bundling for a very specific internal module emulation pattern, which the documentation explicitly states makes it unsuitable for standard internal or external module usage. It primarily functions as an extension of `ts-loader`, requiring `ts-loader` to generate the initial individual declaration files for each source file, which this plugin then processes into a single output.","status":"abandoned","version":"1.0.6-beta.2","language":"javascript","source_language":"en","source_url":"https://github.com/damingerdai/declaration-bundler-webpack4-plugin","tags":["javascript","typescript","webpack4","declaration"],"install":[{"cmd":"npm install declaration-bundler-webpack4-plugin","lang":"bash","label":"npm"},{"cmd":"yarn add declaration-bundler-webpack4-plugin","lang":"bash","label":"yarn"},{"cmd":"pnpm add declaration-bundler-webpack4-plugin","lang":"bash","label":"pnpm"}],"dependencies":[{"reason":"This plugin is specifically designed for Webpack 4. It is unlikely to be compatible with newer versions.","package":"webpack","optional":false},{"reason":"Required to generate individual TypeScript declaration files (`.d.ts`) that this plugin then bundles.","package":"ts-loader","optional":false}],"imports":[{"note":"This plugin is designed for CommonJS environments, reflecting its age and Webpack 4 context. It does not support ESM imports.","wrong":"import DeclarationBundlerPlugin from 'declaration-bundler-webpack-plugin';\nimport { DeclarationBundlerPlugin } from 'declaration-bundler-webpack-plugin';","symbol":"DeclarationBundlerPlugin","correct":"const DeclarationBundlerPlugin = require('declaration-bundler-webpack-plugin');"}],"quickstart":{"code":"const path = require('path');\nconst DeclarationBundlerPlugin = require('declaration-bundler-webpack-plugin');\n\nmodule.exports = {\n    entry: './src/init.ts', // Assumes entry files like src/init.ts, src/foo.ts, src/foo2.ts as per README\n    output: {\n        filename: './builds/bundle.js',\n        path: path.resolve(__dirname, 'dist') // Using path.resolve for output directory\n    },\n    resolve: {\n        extensions: ['.ts', '.tsx', '.js'] // Modern usage, simplified from README for clarity\n    },\n    module: {\n        rules: [ // 'loaders' is deprecated, 'rules' is current for Webpack 4+\n            { test: /\\.ts(x?)$/, loader: 'ts-loader' }\n        ]\n    },\n    watch: false, // Set to false for a typical build, README shows true\n    plugins: [\n        new DeclarationBundlerPlugin({\n            moduleName:'some.path.moduleName',\n            out:'./builds/bundle.d.ts'\n        })\n    ]\n};","lang":"javascript","description":"Demonstrates a basic Webpack 4 configuration using `ts-loader` to compile TypeScript and `DeclarationBundlerPlugin` to consolidate generated `.d.ts` files into a single, internal-module-like declaration file, `bundle.d.ts`."},"warnings":[{"fix":"Carefully evaluate if your module exposure strategy aligns with the plugin's 'internal module' emulation. For typical TypeScript projects, a different declaration bundling approach is likely needed.","message":"This plugin is designed for a very specific use case involving exposing external modules as internal TypeScript modules in a global namespace. It is explicitly stated in the documentation that it is not useful if your project adheres to standard internal or external module patterns.","severity":"gotcha","affected_versions":">=1.0.0"},{"fix":"If using Webpack 5 or later, this plugin is unsuitable. Seek an alternative declaration bundling solution compatible with your Webpack version.","message":"This plugin is explicitly for Webpack 4. It is highly unlikely to be compatible with Webpack 5 or newer versions due to significant breaking changes in Webpack's API and plugin architecture.","severity":"breaking","affected_versions":"1.x.x"},{"fix":"Ensure `ts-loader` is correctly set up in your Webpack configuration and `declaration: true` is enabled in your `tsconfig.json` to produce the necessary `.d.ts` artifacts.","message":"The plugin requires `ts-loader` to be configured with `declaration: true` in your `tsconfig.json` (or equivalent) to generate individual `.d.ts` files for each source file, which it then bundles. Without these individual declaration files, the plugin will have no declarations to process.","severity":"gotcha","affected_versions":">=1.0.0"},{"fix":"Consider migrating to actively maintained declaration bundling solutions or be prepared to fork and maintain this plugin yourself if its niche functionality is critical to your project and no alternatives exist.","message":"The package is in beta (1.0.6-beta.2) and has seen no updates since early 2020. Its original upstream project (`smol/declaration-bundler-webpack-plugin`) is archived. This indicates the plugin is abandoned and not actively maintained, posing a risk for future compatibility, security, and bug fixes.","severity":"deprecated","affected_versions":"1.x.x"}],"env_vars":null,"last_verified":"2026-04-21T00:00:00.000Z","next_check":"2026-07-20T00:00:00.000Z","problems":[{"fix":"Run `npm install declaration-bundler-webpack-plugin --save-dev` or `yarn add declaration-bundler-webpack-plugin --dev`.","cause":"The plugin package is not installed as a dependency in your project.","error":"Module not found: Error: Can't resolve 'declaration-bundler-webpack-plugin' in '...'"},{"fix":"Ensure you are using `const DeclarationBundlerPlugin = require('declaration-bundler-webpack-plugin');` as the plugin exports as a CommonJS module and is not designed for ES module `import` syntax.","cause":"Incorrect import syntax for a CommonJS module, or issues with how `require` resolves the module, leading to attempting to call `new` on a non-constructor.","error":"TypeError: DeclarationBundlerPlugin is not a constructor"},{"fix":"Verify that `ts-loader` is properly set up in your Webpack configuration and that `declaration: true` is enabled within your `tsconfig.json` file to produce the necessary `.d.ts` artifacts.","cause":"`ts-loader` is not configured to generate individual TypeScript declaration files (`.d.ts`), or `declaration: true` is missing in your `tsconfig.json`.","error":"ERROR in DeclarationBundlerPlugin: No declaration files found to bundle. Please ensure 'ts-loader' is configured to generate '.d.ts' files."}],"ecosystem":"npm"}