xref: /expo/tools/taskfile-swc.js (revision cd9c29bc) 
1// Based on Next.js swc taskr file.
2// https://github.com/vercel/next.js/blob/5378db8f807dbb9ff0993662f0a39d0f6cba2452/packages/next/taskfile-swc.js
3
4const { transform } = require('@swc/core');
5const path = require('path');
6
7module.exports = function (task) {
8  task.plugin('swc', {}, function* (file, environment, { stripExtension } = {}) {
9    // Don't compile .d.ts
10    if (file.base.endsWith('.d.ts')) return;
11
12    const setting = {
13      output: 'build',
14      options: {
15        module: {
16          type: 'commonjs',
17        },
18        env: {
19          targets: {
20            node: '14.17.6',
21          },
22        },
23        jsc: {
24          loose: true,
25          parser: {
26            syntax: 'typescript',
27            dynamicImport: true,
28          },
29        },
30      },
31    };
32
33    const filePath = path.join(file.dir, file.base);
34    const inputFilePath = path.join(__dirname, filePath);
35    const outputFilePath = path.dirname(path.join(__dirname, setting.output, filePath));
36
37    const options = {
38      filename: path.join(file.dir, file.base),
39      sourceMaps: true,
40      sourceFileName: path.relative(outputFilePath, inputFilePath),
41      ...setting.options,
42    };
43
44    const output = yield transform(file.data.toString('utf-8'), options);
45    const ext = path.extname(file.base);
46
47    // Replace `.ts|.tsx` with `.js` in files with an extension
48    if (ext) {
49      const extRegex = new RegExp(ext.replace('.', '\\.') + '$', 'i');
50      // Remove the extension if stripExtension is enabled or replace it with `.js`
51      file.base = file.base.replace(extRegex, stripExtension ? '' : '.js');
52    }
53
54    if (output.map) {
55      const map = `${file.base}.map`;
56
57      output.code += Buffer.from(`\n//# sourceMappingURL=${map}`);
58
59      // add sourcemap to `files` array
60      this._.files.push({
61        base: map,
62        dir: file.dir,
63        data: Buffer.from(output.map),
64      });
65    }
66
67    file.data = Buffer.from(output.code);
68  });
69};
70