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189import * as fs from "node:fs";
import * as path from "node:path";
import * as ts from "typescript";
export interface PathsConfig {
baseUrl?: string;
paths?: Record<string, string[]>;
tsconfigDir: string;
rootDir: string;
}
function matchPathPattern(moduleSpecifier: string, pattern: string): { matched: boolean; captured?: string } {
// Handle wildcard patterns
if (pattern.includes("*")) {
// Convert pattern to regex
const regexPattern = pattern
.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")
.replace(/\\\*/g, "(.*)");
const regex = new RegExp(`^${regexPattern}$`);
const match = moduleSpecifier.match(regex);
if (match) {
return { matched: true, captured: match[1] };
}
} else if (moduleSpecifier === pattern) {
// Exact match
return { matched: true };
}
return { matched: false };
}
function resolvePaths(
moduleSpecifier: string,
config: PathsConfig
): string | null {
// Skip relative imports
if (moduleSpecifier.startsWith("./") || moduleSpecifier.startsWith("../")) {
return null;
}
// Skip node modules
if (!moduleSpecifier.startsWith("@") && !moduleSpecifier.includes("/") && !config.paths?.[moduleSpecifier]) {
// Check if this could be a paths alias
const hasMatchingPattern = config.paths && Object.keys(config.paths).some(pattern => {
const cleanPattern = pattern.replace("*", "");
return moduleSpecifier.startsWith(cleanPattern);
});
if (!hasMatchingPattern) {
return null;
}
}
if (!config.paths) return null;
// Try to match against path patterns
for (const [pattern, replacements] of Object.entries(config.paths)) {
const { matched, captured } = matchPathPattern(moduleSpecifier, pattern);
if (matched) {
// Try each replacement in order
for (const replacement of replacements) {
let resolvedPath = replacement;
// Replace wildcard with captured content
if (captured !== undefined && replacement.includes("*")) {
resolvedPath = replacement.replace("*", captured);
}
// Resolve relative to baseUrl or tsconfig directory
const basePath = config.baseUrl
? path.resolve(config.tsconfigDir, config.baseUrl)
: config.tsconfigDir;
const absolutePath = path.resolve(basePath, resolvedPath);
// Check if the path exists (try with various extensions)
const extensions = [".ts", ".tsx", ".js", ".jsx", "/index.ts", "/index.tsx", "/index.js", "/index.jsx"];
// First try exact path
if (fs.existsSync(absolutePath)) {
// Check if it's a directory with index file
if (fs.statSync(absolutePath).isDirectory()) {
for (const ext of ["/index.ts", "/index.tsx", "/index.js", "/index.jsx"]) {
if (fs.existsSync(absolutePath + ext)) {
// Return relative path from the source file location
return absolutePath + ext;
}
}
} else {
return absolutePath;
}
}
// Try with extensions
for (const ext of extensions) {
if (fs.existsSync(absolutePath + ext)) {
return absolutePath + ext;
}
}
}
}
}
return null;
}
export const createPathsResolverTransformer =
(config: PathsConfig): ts.TransformerFactory<ts.SourceFile | ts.Bundle> =>
(context) => {
return (sourceFile) => {
const visitor = (node: ts.Node): ts.Node => {
const isImport = ts.isImportDeclaration(node);
const isExport = ts.isExportDeclaration(node);
const isDynamicImport = ts.isCallExpression(node) && node.expression.kind === ts.SyntaxKind.ImportKeyword;
let originalText: string;
if (isImport || isExport || isDynamicImport) {
if (isImport || isExport) {
if (!node.moduleSpecifier || !ts.isStringLiteral(node.moduleSpecifier)) {
return ts.visitEachChild(node, visitor, context);
}
originalText = node.moduleSpecifier.text;
} else if (isDynamicImport) {
const arg = node.arguments[0]!;
if (!ts.isStringLiteral(arg)) {
return ts.visitEachChild(node, visitor, context);
}
originalText = arg.text;
} else {
return ts.visitEachChild(node, visitor, context);
}
// Try to resolve using paths
const resolvedPath = resolvePaths(originalText, config);
if (resolvedPath && ts.isSourceFile(sourceFile)) {
// Convert absolute path to relative path from current source file
const sourceFileDir = path.dirname(sourceFile.fileName);
let relativePath = path.relative(sourceFileDir, resolvedPath);
// Ensure it starts with ./ or ../
if (!relativePath.startsWith(".")) {
relativePath = "./" + relativePath;
}
// Convert to posix path
relativePath = relativePath.replace(/\\/g, "/");
// Remove extension for TypeScript files
if (relativePath.endsWith(".ts") || relativePath.endsWith(".tsx")) {
relativePath = relativePath.replace(/\.(ts|tsx)$/, "");
}
// Update the node with resolved path
if (isImport) {
return ts.factory.updateImportDeclaration(
node,
node.modifiers,
node.importClause,
ts.factory.createStringLiteral(relativePath),
node.assertClause
);
} else if (isExport) {
return ts.factory.updateExportDeclaration(
node,
node.modifiers,
node.isTypeOnly,
node.exportClause,
ts.factory.createStringLiteral(relativePath),
node.assertClause
);
} else if (isDynamicImport) {
return ts.factory.updateCallExpression(node, node.expression, node.typeArguments, [
ts.factory.createStringLiteral(relativePath),
...node.arguments.slice(1),
]);
}
}
}
return ts.visitEachChild(node, visitor, context);
};
return ts.visitNode(sourceFile, visitor) as ts.SourceFile;
};
};