fix(cdk/schematics): avoid runtime errors thrown by devkit tree when TypeScript tries non-existent path #22982
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TypeScript resolves modules using a rather complicated module resolution algorithm. The algorithm tries various paths to determine a possible entry-point for a module. e.g. it also respects a containing `package.json` file, or respects the closest `node_modules` parent directory. In some situations, TypeScript could end up trying a path where a parent directory segment resolves to an existent file. e.g. consider the following directory structure: ``` node_modules/my-pkg/package.json node_modules/my-pkg/styles.css ``` TypeScript could end up trying a path like: `node_modules/my-pkg/styles.css/package.json` or `node_modules/my-pkg/styles.css/a/b/package.json`. This depends on how the module resolution executes, and how the module is referenced. In the example above though, TypeScript checks if the files exist. Our update logic delegates this check to our virtual file system. The virtual file system currently would throw an error by accident as it walks up the path and discovers that `styles.css` is not a directory, _but_ a file. This results in an error as seen in angular#22919. Fixes angular#22919.
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TypeScript resolves modules using a rather complicated module resolution algorithm. The algorithm tries various paths to determine a possible entry-point for a module. e.g. it also respects a containing `package.json` file, or respects the closest `node_modules` parent directory. In some situations, TypeScript could end up trying a path where a parent directory segment resolves to an existent file. e.g. consider the following directory structure: ``` node_modules/my-pkg/package.json node_modules/my-pkg/styles.css ``` TypeScript could end up trying a path like: `node_modules/my-pkg/styles.css/package.json` or `node_modules/my-pkg/styles.css/a/b/package.json`. This depends on how the module resolution executes, and how the module is referenced. In the example above though, TypeScript checks if the files exist. Our update logic delegates this check to our virtual file system. The virtual file system currently would throw an error by accident as it walks up the path and discovers that `styles.css` is not a directory, _but_ a file. This results in an error as seen in #22919. Fixes #22919. (cherry picked from commit 805d3ae)
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TypeScript resolves modules using a rather complicated module
resolution algorithm. The algorithm tries various paths to
determine a possible entry-point for a module. e.g. it also
respects a containing
package.jsonfile, or respects the closestnode_modulesparent directory.In some situations, TypeScript could end up trying a path where
a parent directory segment resolves to an existent file. e.g.
consider the following directory structure:
TypeScript could end up trying paths like:
node_modules/my-pkg/styles.css/package.jsonornode_modules/my-pkg/styles.css/a/b/package.json. This depends on howthe module resolution executes, and how the module is referenced.
In the example above though, TypeScript checks if the files exist. Our update
logic delegates this check to our virtual file system. The virtual file
system currently would throw an error by accident as it walks up the
path and discovers that
styles.cssis not a directory, but a file (https://github.com/angular/angular-cli/blob/master/packages/angular_devkit/schematics/src/tree/host-tree.ts#L321)This results in an error as seen in
#22919. This seems to have been introduced
accidentally with #21161.