How does Vite's handling of nested conditions compare to other bundlers

Nesting and Specificity Order

- Vite: Conditions can be nested in the `exports` field of `package.json`. They should be specified from most specific to least specific. Vite will match the first condition that is in its allowed conditions list[1].

- Rollup: Rollup supports nested conditions in the `exports` field, following the same specificity order as Vite[2].

- Webpack: Webpack also supports nested conditions in the `exports` field, requiring the same specificity order as Vite and Rollup[3].

Allowed Conditions

- Vite: Has a predefined list of allowed conditions that includes `import`, `module`, `browser`, `default`, and environment-specific conditions like `production` or `development`. The `resolve.conditions` config option can add more[1].

- Rollup: Allows specifying custom conditions via the `preserveModules` and `preserveModulesRoot` options[2].

- Webpack: Allows defining custom conditions via the `resolve.conditionNames` option[3].

Handling Incorrect Conditions

- Vite: If the conditions are not structured correctly or Vite selects an incorrect export, it can lead to runtime errors. Careful structuring of the `exports` field is crucial[1].

- Rollup: Rollup will log warnings if it encounters issues with the `exports` field, but may still resolve an entry point[2].

- Webpack: Webpack will log errors if the `exports` field is malformed or if it cannot resolve an entry point[3].

Monorepo Support

- Vite: Automatically detects linked dependencies in a monorepo and treats them as source code, analyzing their dependencies instead of bundling them[4].

- Rollup: Requires using plugins like `@rollup/plugin-alias` to handle linked dependencies in a monorepo[2].

- Webpack: Requires using plugins like `enhanced-resolve` to handle linked dependencies in a monorepo[3].

In summary, Vite's handling of nested conditions is similar to other bundlers, but it has some advantages like automatic monorepo support and a more robust allowed conditions list. However, all bundlers require careful structuring of the `exports` field to avoid issues.