purgecode/lib/graph.js

A safe, smart code-cleaning utility for JavaScript/TypeScript projects

import path from "path";
export function findUnusedFiles(project, entryPoints = []) {
    const sourceFiles = project.getSourceFiles();
    const allFilePaths = new Set(sourceFiles.map((sf) => sf.getFilePath()));
    const importedFiles = new Set();
    for (const sourceFile of sourceFiles) {
        // Get all imports
        const imports = sourceFile.getImportDeclarations();
        const exports = sourceFile.getExportDeclarations(); // Re-exports
        for (const decl of [...imports, ...exports]) {
            const moduleSpecifier = decl.getModuleSpecifier();
            if (moduleSpecifier) {
                const sourceFileDef = decl.getModuleSpecifierSourceFile();
                if (sourceFileDef) {
                    importedFiles.add(sourceFileDef.getFilePath());
                }
            }
        }
    }
    // Filter out files that are imported
    let unusedFiles = [...allFilePaths].filter((filePath) => !importedFiles.has(filePath));
    // Filter out known entry points or common entry patterns
    const entryPatterns = ["index", "main", "app", "entry"];
    unusedFiles = unusedFiles.filter((filePath) => {
        const baseName = path.basename(filePath, path.extname(filePath));
        return !entryPatterns.includes(baseName.toLowerCase());
    });
    return unusedFiles;
}