fix: resolve named CommonJS imports in dev-server bundling

[Aukevanoost]

Fixes #83

This pull request introduces comprehensive improvements to the handling of CommonJS (CJS) and ECMAScript Module (ESM) interop in the node-modules-bundler for esbuild. It adds robust detection and synthetic export generation for named exports from CJS modules, ensuring that named imports work correctly across module boundaries, especially when using module federation or import maps. The update also includes extensive unit tests for the new logic.

CommonJS/ESM Interop Enhancements

• Added a new createCjsNamedExportsPlugin esbuild plugin that, for CommonJS entry points, generates a synthetic ESM module re-exporting both the default and all discovered named exports at build time, fixing issues with named imports from CJS modules (e.g., import { isDayjs } from 'dayjs') [1]], [2]]).
• Implemented helper functions:
  • planCjsWrap to decide if a module needs wrapping and which keys to re-export ([src/tools/esbuild/node-modules-bundler.tsR31-R289]).
  • buildSyntheticCjsEntry to generate the synthetic ESM entry ([src/tools/esbuild/node-modules-bundler.tsR31-R289]).
  • isCommonjsCandidate to determine if a file should be treated as CommonJS ([src/tools/esbuild/node-modules-bundler.tsR31-R289]).
  • isEsmInteropError to distinguish benign ESM interop errors from real runtime failures ([src/tools/esbuild/node-modules-bundler.tsR31-R289]).
  • isIdentifierName to validate exportable identifier names ([src/tools/esbuild/node-modules-bundler.tsR31-R289]).

Build Pipeline and Transform Logic

• Updated the esbuild plugin setup to ensure the new CJS named exports plugin precedes the CommonJS plugin, so it takes precedence for entry-point resolution ([src/tools/esbuild/node-modules-bundler.tsR414-R416]).
• Refactored the transform skip logic into a new canSkipTransform function, which only skips .mjs files that don't need linking and when advanced optimizations are disabled [1]], [2]]).

Testing

• Added comprehensive unit tests for all new helper functions and plugin logic in node-modules-bundler.spec.ts, covering edge cases and ensuring correctness for CJS/ESM detection, export generation, and error handling [1]], [2]]).

These changes significantly improve the reliability and correctness of named import handling from CJS modules in esbuild-based builds, especially in federated or import map scenarios.