swc: Support paths from tsconfig

src/test/transpilers.spec.ts

@@ -3,13 +3,23 @@
 // Should consolidate them here.
 
 import { context } from './testlib';
-import { ctxTsNode, testsDirRequire } from './helpers';
+import {
+ CMD_TS_NODE_WITHOUT_PROJECT_FLAG,
+ ctxTsNode,
+ TEST_DIR,
+ testsDirRequire,
+} from './helpers';
 import * as expect from 'expect';
+import { createExec } from './exec-helpers';
+
+const exec = createExec({
+ cwd: TEST_DIR,
+});
 
 const test = context(ctxTsNode);
 
 test.suite('swc', (test) => {
- test('verify that TS->SWC target mappings suppport all possible values from both TS and SWC', async (t) => {
+ test('verify that TS->SWC target mappings support all possible values from both TS and SWC', async (t) => {
  const swcTranspiler = testsDirRequire(
  'ts-node/transpilers/swc-experimental'
  ) as typeof import('../transpilers/swc');
@@ -44,4 +54,18 @@ test.suite('swc', (test) => {
  expect([...swcTranspiler.targetMapping.values()]).toContain(target);
  }
  });
+
+ test('verify paths are mapped correctly', async (t) => {
+ const { err, stdout } = await exec(
+ `${CMD_TS_NODE_WITHOUT_PROJECT_FLAG} swc-with-paths`,
+ {
+ env: {
+ ...process.env,
+ NODE_OPTIONS: `${process.env.NODE_OPTIONS || ''}}`,
+ },
+ }
+ );
+ expect(err).toBe(null);
+ expect(stdout).toMatch('Hello, world!\n');
+ });
 });

src/transpilers/swc.ts

@@ -1,3 +1,4 @@
+import * as path from 'path';
 import type * as ts from 'typescript';
 import type * as swcWasm from '@swc/wasm';
 import type * as swcTypes from '@swc/core';
@@ -60,6 +61,8 @@ export function create(createOptions: SwcTranspilerOptions): Transpiler {
  strict,
  alwaysStrict,
  noImplicitUseStrict,
+ baseUrl,
+ paths,
  } = compilerOptions;
  const nonTsxOptions = createSwcOptions(false);
  const tsxOptions = createSwcOptions(true);
@@ -110,6 +113,16 @@ export function create(createOptions: SwcTranspilerOptions): Transpiler {
  noImplicitUseStrict === true
  ? false
  : true;
+
+ const absolutePaths = Object.fromEntries(
+ Object.entries(paths || {})
+ .filter(([key, values]) => values.length > 0)
+ .map(([key, values]) => [
+ key,
+ values.map((value) => path.resolve(baseUrl || './', value)),
+ ])
+ ) as { [from: string]: [string] };
+
  return {
  sourceMaps: sourceMap,
  // isModule: true,
@@ -144,6 +157,9 @@ export function create(createOptions: SwcTranspilerOptions): Transpiler {
  } as swcTypes.ReactConfig,
  },
  keepClassNames,
+ baseUrl,
+ paths:
+ Object.keys(absolutePaths).length > 0 ? absolutePaths : undefined,
  } as swcTypes.JscConfig,
  };
  }

tests/swc-with-paths/index.ts

@@ -0,0 +1 @@
+import '@parent-dir/hello-world';

tests/swc-with-paths/tsconfig.json

@@ -0,0 +1,12 @@
+{
+ "ts-node": {
+ "swc": true
+ },
+ "compilerOptions": {
+ "module": "CommonJS",
+ "baseUrl": "./",
+ "paths": {
+ "@parent-dir/*": ["../*"]
+ }
+ }
+}