{"id":16894,"library":"rucksack-lite","title":"Rucksack Lite Resource Management Core","description":"rucksack-lite is a JavaScript library providing the foundational `RucksackLite` class for managing and preparing JavaScript and CSS resources. It serves as the core resource abstraction layer, differentiating it from actual bundlers, and is utilized by the more comprehensive `rucksack` bundler package. Currently at version 6.0.0, the library underwent a complete rewrite in this major release, focusing on robust handling of both local and remote resources. It defines a `RucksackResource` class internally for managing resource paths, types (JS/CSS), and generating the necessary HTML markup for inclusion. While its release cadence appears somewhat irregular, major versions signify active development with significant architectural shifts, such as licensing updates and full rewrites. Its primary differentiation lies in offering a clean, object-oriented API for resource management, abstracting away complexities of path resolution and markup generation prior to the actual bundling process.","status":"active","version":"6.0.0","language":"javascript","source_language":"en","source_url":"ssh://git@github.com/Bloggify/rucksack-lite","tags":["javascript","rucksack","and","css","bundler"],"install":[{"cmd":"npm install rucksack-lite","lang":"bash","label":"npm"},{"cmd":"yarn add rucksack-lite","lang":"bash","label":"yarn"},{"cmd":"pnpm add rucksack-lite","lang":"bash","label":"pnpm"}],"dependencies":[],"imports":[{"note":"RucksackLite is the default export and the main class. The package is ESM-only since v6.","wrong":"const RucksackLite = require('rucksack-lite')","symbol":"RucksackLite","correct":"import RucksackLite from 'rucksack-lite'"},{"note":"RucksackResource is a class for defining individual assets; it's documented as a constructor and likely a named export from the main module.","wrong":"import RucksackResource from 'rucksack-lite/lib/RucksackResource'","symbol":"RucksackResource","correct":"import { RucksackResource } from 'rucksack-lite'"},{"note":"For environments requiring dynamic loading or specific module resolution, RucksackLite can be imported asynchronously in both ESM and CJS contexts.","symbol":"Dynamic Import","correct":"const { default: RucksackLite } = await import('rucksack-lite');"}],"quickstart":{"code":"import RucksackLite, { RucksackResource } from 'rucksack-lite';\nimport path from 'path';\nimport { fileURLToPath } from 'url';\n\nconst __filename = fileURLToPath(import.meta.url);\nconst __dirname = path.dirname(__filename);\n\nasync function setupRucksack() {\n  const r = new RucksackLite({\n    name: \"my-app\",\n    bundle_dir: path.resolve(__dirname, \"output\"), // Ensure an absolute path for bundle_dir\n    bundle_url: \"/static\",\n    input: \"main.js\" // This input file isn't created in this example, but defines the primary bundle.\n  });\n\n  // Add a remote JavaScript resource by URL string\n  r.add(\"https://example.com/index.js\");\n\n  // Add a remote CSS resource using the RucksackResource class for explicit typing\n  r.add(new RucksackResource({\n    path: \"https://example.com/styles.css\",\n    type: \"css\"\n  }));\n\n  // Generate the HTML markup (note: this does not perform actual bundling)\n  const htmlMarkup = r.html();\n  console.log('Generated HTML Markup:\\n', htmlMarkup);\n\n  // The `bundle()` method primarily processes local resources for path resolution\n  // It does NOT create actual bundled files without the full `rucksack` package and actual files.\n  try {\n    console.log('\\nAttempting to call bundle() (no actual files created in this quickstart):');\n    await r.bundle();\n    console.log('Bundle operation completed (paths resolved, if any local resources were added).');\n  } catch (error) {\n    console.warn('Bundle operation warning (expected without actual files/bundler):', error.message);\n  }\n\n  console.log('\\nRefreshed Markup after potential bundle operation:');\n  console.log(r.html());\n}\n\nsetupRucksack().catch(console.error);\n","lang":"javascript","description":"This quickstart demonstrates how to instantiate `RucksackLite`, add various types of resources (remote JS by string, remote CSS explicitly via `RucksackResource`), and generate the corresponding HTML markup. It highlights the resource management capabilities without performing actual file bundling, which is the domain of the `rucksack` package."},"warnings":[{"fix":"Review the updated API documentation, especially for resource addition (`add`) and initialization (`RucksackLite` constructor), and adapt code accordingly. The example uses ESM syntax with `import.meta.url`.","message":"Version 6.0.0 introduces a complete rewrite of the library, potentially breaking existing integrations. Key changes include a refined resource class and updated handling of local/remote resources.","severity":"breaking","affected_versions":">=6.0.0"},{"fix":"Migrate your project to use ES Modules (e.g., use `import` syntax, ensure `\"type\": \"module\"` in package.json, or use `.mjs` file extension). Alternatively, use dynamic import: `const { default: RucksackLite } = await import('rucksack-lite');` in a CommonJS context.","message":"The package transitioned to an ESM-only module, indicated by the use of `import` statements and `import.meta.url` in examples. CommonJS `require()` is no longer supported directly for synchronous imports.","severity":"breaking","affected_versions":">=6.0.0"},{"fix":"Review The KINDLY License terms available on the project's GitHub repository to ensure compatibility with your project's licensing and usage policies.","message":"Version 3.0.0 relicensed the project under The KINDLY License. While this might not be a direct API breaking change, it represents a significant change in usage terms and conditions which may require review by legal or compliance teams.","severity":"breaking","affected_versions":">=3.0.0"},{"fix":"Ensure you are using `rucksack` for actual bundling operations. `rucksack-lite` provides the resource abstraction layer. Do not expect `rucksack-lite.bundle()` to create minified or concatenated files without additional setup or the full `rucksack` package.","message":"`rucksack-lite` focuses solely on resource management, path resolution, and HTML markup generation. It does not perform actual JavaScript or CSS file bundling, minification, or concatenation. For bundling, the separate `rucksack` package is required.","severity":"gotcha","affected_versions":">=1.0.0"}],"env_vars":null,"last_verified":"2026-04-22T00:00:00.000Z","next_check":"2026-07-21T00:00:00.000Z","problems":[{"fix":"Convert your module to ES Modules (e.g., use `import` syntax, ensure `\"type\": \"module\"` in package.json, or use `.mjs` file extension). Alternatively, use dynamic import: `const { default: RucksackLite } = await import('rucksack-lite');`","cause":"Attempting to import `rucksack-lite` using `require()` in a CommonJS module, but the package is an ES Module.","error":"ERR_REQUIRE_ESM"},{"fix":"Use the default import syntax: `import RucksackLite from 'rucksack-lite';`","cause":"Incorrectly importing `RucksackLite` (e.g., using named import `import { RucksackLite } from 'rucksack-lite'`) when it is a default export.","error":"TypeError: RucksackLite is not a constructor"},{"fix":"Ensure `bundle_dir` is always an absolute path. Use Node.js built-in `path.resolve(__dirname, 'your_directory')` or similar methods to construct an absolute path.","cause":"The `bundle_dir` option passed to `RucksackLite` constructor is either missing or provided as a relative path, which can cause issues with file operations or later bundling steps.","error":"Error: bundle_dir is not defined or is not an absolute path"}],"ecosystem":"npm","meta_description":null}