kitten.sh
1#!/usr/bin/env node
2
3// This CLI generates .js.flow definitions from .d.ts
4// TS definitions.
5// It accepts files to generate definitions for via
6// argv;
7
8const path = require('path');
9const fs = require('fs');
10const globby = require('globby');
11
12const { promisify } = require('util');
13const { compiler, beautify } = require('flowgen');
14
15const cwd = process.cwd();
16const writeFile = promisify(fs.writeFile);
17const readFile = promisify(fs.readFile);
18const preamble = '// @flow\n\n';
19
20const genEntry = async () => {
21 try {
22 fs.mkdirSync(path.resolve(cwd, 'dist'));
23 } catch (err) {
24 if (err.code !== 'EEXIST') {
25 throw err;
26 }
27 }
28
29 let entry = await readFile(path.resolve(cwd, 'index.js.flow'), { encoding: 'utf8' });
30
31 entry = entry.replace(/.\/src/g, '../src');
32
33 const outputCJS = path.resolve(cwd, 'dist/wonka.js.flow');
34 const outputES = path.resolve(cwd, 'dist/wonka.es.js.flow');
35
36 return Promise.all([
37 writeFile(outputCJS, entry, { encoding: 'utf8' }),
38 writeFile(outputES, entry, { encoding: 'utf8' })
39 ]);
40};
41
42const gen = async () => {
43 const input = await globby(['src/*.d.ts', 'src/**/*.d.ts'], {
44 gitignore: true
45 });
46
47 if (input.length === 0) {
48 throw new Error('No input files passed as arguments.');
49 }
50
51 console.log(`Compiling ${input.length} TS definitions to Flow...`);
52
53 const defs = input.map(filename => {
54 const fullpath = path.resolve(cwd, filename);
55 const flowdef = beautify(compiler.compileDefinitionFile(fullpath));
56 return { fullpath, flowdef };
57 });
58
59 const write = defs.map(({ fullpath, flowdef }) => {
60 const basename = path.basename(fullpath, '.d.ts');
61 const filepath = path.dirname(fullpath);
62 const newpath = path.join(filepath, basename + '.js.flow');
63
64 // Fix incorrect imports
65 const fixedFlowdef = flowdef.replace(/^import \{/g, 'import type {');
66
67 return writeFile(newpath, preamble + fixedFlowdef, {
68 encoding: 'utf8'
69 });
70 });
71
72 return Promise.all([...write, genEntry()]);
73};
74
75gen()
76 .then(() => {
77 process.exit(0);
78 })
79 .catch(err => {
80 console.error(err.message);
81 process.exit(1);
82 });