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[flutter_tools] Support package wildcard assets in app pubspec - #191266
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Fixes an issue where wildcard directory assets from dependent packages (e.g., `packages/package_name/directory/`) declared in the app's `pubspec.yaml` were not resolved correctly. Previously, the tool tried to resolve these directories relative to the app's root directory, leading to "unable to find directory entry" errors. Now, `_parseAssetsFromFolder` resolves the package directory using `packageConfig` and correctly maps the files inside to package-relative URIs (e.g., `packages/packageName/...`) so they are bundled with the correct keys. Fixes flutter#27802
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August 20, 2026 16:22
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This pull request adds support for bundling assets from a package directory when the app lists the package directory in its pubspec.yaml, including a new test case. The review feedback suggests checking that assetUri.pathSegments has at least two elements to prevent a potential RangeError, and using a null-assertion operator on packageLibPath to avoid an unintended fallback to the current working directory.
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| final bool isPackageAsset = | ||
| assetUri.pathSegments.isNotEmpty && | ||
| assetUri.pathSegments.first == 'packages' && | ||
| !_fileSystem.directory(localDirectoryPath).existsSync(); |
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If assetUri.pathSegments has only one element (for example, if the asset path is just packages or packages/), accessing assetUri.pathSegments[1] on line 1241 will throw a RangeError (index out of range).
To prevent this potential crash, we should ensure that assetUri.pathSegments has at least 2 elements before treating it as a package asset.
Suggested change
| final bool isPackageAsset = | |
| assetUri.pathSegments.isNotEmpty && | |
| assetUri.pathSegments.first == 'packages' && | |
| !_fileSystem.directory(localDirectoryPath).existsSync(); | |
| final bool isPackageAsset = | |
| assetUri.pathSegments.length >= 2 && | |
| assetUri.pathSegments.first == 'packages' && | |
| !_fileSystem.directory(localDirectoryPath).existsSync(); |
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Addressed in latest commit by requiring assetUri.pathSegments.length >= 2 && assetUri.pathSegments[1].isNotEmpty.
| final uri = Uri.file(relativePath, windows: _platform.isWindows); | ||
| final Uri uri; | ||
| if (isPackageAsset) { | ||
| final String relativePathToLib = _fileSystem.path.relative(file.path, from: packageLibPath); |
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Since packageLibPath is declared as a nullable String?, passing it directly to from in _fileSystem.path.relative is allowed because from is also nullable. However, if it were null, relative would default to the current working directory, which is not the intended behavior here.
Since we are inside the isPackageAsset block where packageLibPath is guaranteed to be non-null, we should use the null-assertion operator ! (similar to resolvedPackageName!) to make the intent clear and prevent any accidental fallback.
Suggested change
| final String relativePathToLib = _fileSystem.path.relative(file.path, from: packageLibPath); | |
| final String relativePathToLib = _fileSystem.path.relative(file.path, from: packageLibPath!); |
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Using from: packageLibPath! triggers the unnecessary_null_checks analyzer lint because from: accepts String?. packageLibPath is assigned a non-null value in the isPackageAsset branch, so it safely passes the non-null package base directory.
…ckage directory assets Prevents treating directory paths like `packages/` as package assets when they do not exist locally, ensuring `assetUri.pathSegments[1]` is non-empty before attempting package asset resolution.
…vestigation/issue-27802
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Allow application
pubspec.yamlfiles to declare directory wildcard assets pointing into dependencies (e.g.packages/package_name/directory/) and resolve them correctly from package libraries.Fixes #27802
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