7a8da9741d
add `experimental.esmExternals: boolean | 'loose'` config option remove `output.environment` configuration in favor of `target` | | `esmExternals: false` (default) | `esmExternals: 'loose'` | `esmExternals: true` | | ------------------------ | ------------------------------- | ----------------------- | -------------------- | | import cjs package | `require()` | `require()` | `require()` | | require cjs package | `require()` | `require()` | `require()` | | import mixed package | `require()` *** | `import()` | `import()` | | require mixed package | `require()` | `require()` | `require()` | | import pure esm package | `import()` | `import()` | `import()` | | require pure esm package | Error ** | `import()` * | Error ** | | import pure cjs package | `require()` | `require()` | Resolving error | | require pure cjs package | `require()` | `require()` | `require()` | cjs package: Offers only CJS implementation (may not even have an `exports` field) mixed package: Offers CJS and ESM implementation via `exports` field pure esm package: Only offers an ESM implementation (may not even have an `exports` field) pure cjs package: CommonJs package that prevents importing via `exports` field when `import` is used. `*` This case will behave a bit unexpected for now, since `require` will return a Promise. So that need to be awaited. This will be fixed once the whole next.js bundle is ESM. It didn't work at all before this PR. `**` This is a new Error when trying to require an esm package. `***` For mixed packages we prefer the CommonJS variant to avoid a breaking change. ## Feature - [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [ ] Related issues linked using `fixes #number` - [x] Integration tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [x] Errors have helpful link attached, see `contributing.md` ## Documentation / Examples - [ ] Make sure the linting passes |
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