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 let entry = await readFile(path.resolve(cwd, 'index.js.flow'), { encoding: 'utf8' });
22
23 entry = entry.replace(/.\/src/g, '../src');
24
25 const outputCJS = path.resolve(cwd, 'dist/wonka.js.flow');
26 const outputES = path.resolve(cwd, 'dist/wonka.es.js.flow');
27
28 return Promise.all([
29 writeFile(outputCJS, entry, { encoding: 'utf8' }),
30 writeFile(outputES, entry, { encoding: 'utf8' })
31 ]);
32};
33
34const gen = async () => {
35 const input = await globby(['src/*.d.ts', 'src/**/*.d.ts'], {
36 gitignore: true
37 });
38
39 if (input.length === 0) {
40 throw new Error('No input files passed as arguments.');
41 }
42
43 console.log(`Compiling ${input.length} TS definitions to Flow...`);
44
45 const defs = input.map(filename => {
46 const fullpath = path.resolve(cwd, filename);
47 const flowdef = beautify(compiler.compileDefinitionFile(fullpath));
48 return { fullpath, flowdef };
49 });
50
51 const write = defs.map(({ fullpath, flowdef }) => {
52 const basename = path.basename(fullpath, '.d.ts');
53 const filepath = path.dirname(fullpath);
54 const newpath = path.join(filepath, basename + '.js.flow');
55
56 // Fix incorrect imports
57 const fixedFlowdef = flowdef.replace(/^import \{/g, 'import type {');
58
59 return writeFile(newpath, preamble + fixedFlowdef, {
60 encoding: 'utf8'
61 });
62 });
63
64 return Promise.all([...write, genEntry()]);
65};
66
67gen()
68 .then(() => {
69 process.exit(0);
70 })
71 .catch(err => {
72 console.error(err.message);
73 process.exit(1);
74 });