Function getLocalModuleSpecifier

internal/modulespecifiers/specifiers.go:485–634

(
	moduleFileName string,
	info Info,
	compilerOptions *core.CompilerOptions,
	host ModuleSpecifierGenerationHost,
	importMode core.ResolutionMode,
	preferences ModuleSpecifierPreferences,
	pathsOnly bool,
)

}

func getLocalModuleSpecifier(
	moduleFileName string,
	info Info,
	compilerOptions *core.CompilerOptions,
	host ModuleSpecifierGenerationHost,
	importMode core.ResolutionMode,
	preferences ModuleSpecifierPreferences,
	pathsOnly bool,
) string {
	paths := compilerOptions.Paths
	rootDirs := compilerOptions.RootDirs

	if pathsOnly && paths == nil {
		return ""
	}

	sourceDirectory := info.SourceDirectory

	allowedEndings := preferences.getAllowedEndingsInPreferredOrder(importMode)
	var relativePath string
	if len(rootDirs) > 0 {
		relativePath = tryGetModuleNameFromRootDirs(rootDirs, moduleFileName, sourceDirectory, allowedEndings, compilerOptions, host)
	}
	if len(relativePath) == 0 {
		relativePath = processEnding(ensurePathIsNonModuleName(tspath.GetRelativePathFromDirectory(sourceDirectory, moduleFileName, tspath.ComparePathsOptions{
			UseCaseSensitiveFileNames: host.UseCaseSensitiveFileNames(),
			CurrentDirectory:          host.GetCurrentDirectory(),
		})), allowedEndings, compilerOptions, host)
	}

	if (paths == nil && !compilerOptions.GetResolvePackageJsonImports()) || preferences.relativePreference == RelativePreferenceRelative {
		if pathsOnly {
			return ""
		}
		return relativePath
	}

	root := compilerOptions.GetPathsBasePath(host.GetCurrentDirectory())
	baseDirectory := tspath.GetNormalizedAbsolutePath(root, host.GetCurrentDirectory())
	relativeToBaseUrl := getRelativePathIfInSameVolume(moduleFileName, baseDirectory, host.UseCaseSensitiveFileNames())
	if len(relativeToBaseUrl) == 0 {
		if pathsOnly {
			return ""
		}
		return relativePath
	}

	var fromPackageJsonImports string
	if !pathsOnly {
		fromPackageJsonImports = tryGetModuleNameFromPackageJsonImports(
			moduleFileName,
			sourceDirectory,
			compilerOptions,
			host,
			importMode,
			prefersTsExtension(allowedEndings),
		)
	}