rwsdk/dist/lib/normalizeModulePath.mjs

Build fast, server-driven webapps on Cloudflare with SSR, RSC, and realtime

import path from "node:path";
import { normalizePath } from "vite";
const windowsDriveAbsoluteRE = /^[A-Za-z]:\//;
// Vite's normalizePath only converts backslashes on Windows. This wrapper
// ensures forward slashes regardless of platform, which matters when win32
// path functions are injected for testing on Linux.
const normalizePathSeparators = (p) => normalizePath(p.replace(/\\/g, "/"));
/**
 * Find the number of common ancestor segments between two absolute paths.
 * Returns the count of shared directory segments from the root.
 */
export function findCommonAncestorDepth(path1, path2) {
    const segments1 = path1.split("/").filter(Boolean);
    const segments2 = path2.split("/").filter(Boolean);
    let commonLength = 0;
    const minLength = Math.min(segments1.length, segments2.length);
    for (let i = 0; i < minLength; i++) {
        if (segments1[i] === segments2[i]) {
            commonLength++;
        }
        else {
            break;
        }
    }
    return commonLength;
}
/**
 * Normalize a module path to a consistent form.
 * Returns slash-prefixed paths for files within project root,
 * or absolute paths for external files.
 *
 * Examples:
 *   /Users/justin/my-app/src/page.ts      → /src/page.ts
 *   ../shared/utils.ts                    → /Users/justin/shared/utils.ts
 *   /src/page.ts (Vite-style)            → /src/page.ts
 *   node_modules/foo/index.js            → /node_modules/foo/index.js
 *
 * With { absolute: true }:
 *   /Users/justin/my-app/src/page.ts      → /Users/justin/my-app/src/page.ts
 *
 * With { isViteStyle: false }:
 *   /opt/tools/logger.ts                  → /opt/tools/logger.ts (treated as external)
 *   /src/page.tsx                         → /src/page.tsx (treated as external)
 *
 * With { isViteStyle: true }:
 *   /opt/tools/logger.ts                  → /opt/tools/logger.ts (resolved as Vite-style)
 *   /src/page.tsx, { absolute: true }     → /Users/justin/my-app/src/page.tsx
 */
export function normalizeModulePath(modulePath, projectRootDir, options = {}, _path = path) {
    modulePath = normalizePathSeparators(modulePath);
    projectRootDir = normalizePathSeparators(_path.resolve(projectRootDir));
    // Handle empty string or current directory
    if (modulePath === "" || modulePath === ".") {
        return options.absolute ? projectRootDir : "/";
    }
    // For relative paths, resolve them first
    let resolved;
    if (_path.isAbsolute(modulePath)) {
        if (modulePath.startsWith(projectRootDir + "/") ||
            modulePath === projectRootDir) {
            // Path starts with project root - it's a real absolute path inside project
            resolved = modulePath;
        }
        else {
            // Check how the path relates to the project root
            if (options.isViteStyle !== undefined) {
                // User explicitly specified whether this should be treated as Vite-style
                if (options.isViteStyle) {
                    resolved = _path.resolve(projectRootDir, modulePath.slice(1));
                }
                else {
                    resolved = modulePath;
                }
            }
            else {
                // Fall back to heuristics using common ancestor depth
                const commonDepth = findCommonAncestorDepth(modulePath, projectRootDir);
                if (commonDepth > 0 || windowsDriveAbsoluteRE.test(modulePath)) {
                    // Paths share meaningful common ancestor, or this is a Windows absolute
                    // path on a different drive — treat as a real external absolute path
                    resolved = modulePath;
                }
                else {
                    // No meaningful common ancestor - assume Vite-style path within project
                    resolved = _path.resolve(projectRootDir, modulePath.slice(1));
                }
            }
        }
    }
    else {
        resolved = _path.resolve(projectRootDir, modulePath);
    }
    resolved = normalizePathSeparators(resolved);
    // If absolute option is set, always return absolute paths
    if (options.absolute) {
        return resolved;
    }
    // Check if the resolved path is within the project root
    const relative = _path.relative(projectRootDir, resolved);
    // If the path goes outside the project root (starts with ..) or is on a
    // different drive (Windows: path.relative returns an absolute path), return absolute
    if (relative.startsWith("..") || _path.isAbsolute(relative)) {
        return resolved;
    }
    // Path is within project root, return as Vite-style relative path
    const cleanRelative = relative === "." ? "" : relative;
    return "/" + normalizePathSeparators(cleanRelative);
}