fix(resolve): resolve relative tsconfig paths against cwd

crates/rspack_resolver/src/cache.rs

@@ -68,6 +68,14 @@ impl<Fs: Send + Sync + FileSystem> Cache<Fs> {
     F: FnOnce(TsConfig) -> Fut + Send,
     Fut: Send + Future<Output = Result<TsConfig, ResolveError>>,
   {
+    // Like TypeScript, resolve the config file against cwd before deriving
+    // baseUrl and paths. A relative config must not produce relative resources.
+    let path = if path.is_absolute() {
+      Cow::Borrowed(path)
+    } else {
+      Cow::Owned(camino::absolute_utf8(path)?)
+    };
+    let path = path.as_ref();
     if let Some(tsconfig_ref) = self.tsconfigs.get(path.as_std_path()) {
       return Ok(Arc::clone(tsconfig_ref.value()));
     }

packages/rspack/src/config/adapter.ts

@@ -1,3 +1,4 @@
+import path from 'node:path';
 import {
   type RawAssetGeneratorDataUrlFnCtx,
   type RawAssetGeneratorOptions,
@@ -257,7 +258,8 @@ function getRawTsConfig(
   if (tsConfig === undefined) return tsConfig;
   const { configFile, references } = tsConfig;
   return {
-    configFile,
+    // WASI's cwd can differ from the JavaScript host's working directory.
+    configFile: path.resolve(configFile),
     referencesType:
       references === 'auto' ? 'auto' : references ? 'manual' : 'disabled',
     references: references === 'auto' ? undefined : references,

tests/rspack-test/configCases/resolve/tsconfig-relative-import-meta/generated/client.js

@@ -0,0 +1 @@
+export const url = import.meta.url;

tests/rspack-test/configCases/resolve/tsconfig-relative-import-meta/index.js

@@ -0,0 +1,5 @@
+import { url } from "@generated/client";
+
+it("should resolve import.meta.url through tsconfig paths with an absolute or relative config file", () => {
+	expect(url).toBe(EXPECTED_URL);
+});

tests/rspack-test/configCases/resolve/tsconfig-relative-import-meta/rspack.config.js

@@ -0,0 +1,23 @@
+const path = require('node:path');
+const { pathToFileURL } = require('node:url');
+const { DefinePlugin } = require('@rspack/core');
+
+/** @type {import("@rspack/core").Configuration[]} */
+module.exports = ['tsconfig.json', 'tsconfig-no-base-url.json'].flatMap(
+  (filename) => {
+    const configFile = path.join(__dirname, filename);
+    return [configFile, path.relative(process.cwd(), configFile)].flatMap(
+      (configFile) =>
+        [configFile, { configFile }].map((tsConfig) => ({
+          resolve: { tsConfig },
+          plugins: [
+            new DefinePlugin({
+              EXPECTED_URL: JSON.stringify(
+                pathToFileURL(path.join(__dirname, 'generated/client.js')).href,
+              ),
+            }),
+          ],
+        })),
+    );
+  },
+);

tests/rspack-test/configCases/resolve/tsconfig-relative-import-meta/tsconfig-no-base-url.json

@@ -0,0 +1,7 @@
+{
+	"compilerOptions": {
+		"paths": {
+			"@generated/*": ["./generated/*"]
+		}
+	}
+}

tests/rspack-test/configCases/resolve/tsconfig-relative-import-meta/tsconfig.json

@@ -0,0 +1,8 @@
+{
+	"compilerOptions": {
+		"baseUrl": "./generated",
+		"paths": {
+			"@generated/*": ["./*"]
+		}
+	}
+}