07ea6cf582
Previously, there was circular dependency between `ngcc/src/utils.ts`, `ngcc/src/dependencies/dependency_host.ts` and `ngcc/src/dependencies/esm_dependency_host.ts`. More specifically, `utils.ts` would [import from `esm_dependency_host.ts`][1], which would [import from `dependency_host.ts`][2], which would in turn [import from `utils.ts`][3]. This might be fine in some environments/module formats, but it can cause unclear errors in the transpiled CommonJS/UMD format (given how Node.js handles [cycles in module resolution][4]). (An example error can be found [here][5].) This commit fixes the problem by moving the code that depends on `EsmDependencyHost` out of `utils.ts` and into a dedicated file under `dependencies/`. It also converts the `createDtsDependencyHost()` function to a class for consistency with the rest of the `DependencyHost`s. [1]: https://github.com/angular/angular/blob/18d89c9c8/packages/compiler-cli/ngcc/src/utils.ts#L10 [2]: https://github.com/angular/angular/blob/18d89c9c8/packages/compiler-cli/ngcc/src/dependencies/esm_dependency_host.ts#L10 [3]: https://github.com/angular/angular/blob/18d89c9c8/packages/compiler-cli/ngcc/src/dependencies/dependency_host.ts#L9 [4]: https://nodejs.org/api/modules.html#modules_cycles [5]: https://circleci.com/gh/angular/angular/577581 PR Close #34512
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