kitten.sh
1import { transformSync as transform } from '@babel/core';
2import { createFilter } from '@rollup/pluginutils';
3
4const simplifyJSTags = ({ types: t }) => ({
5 visitor: {
6 TaggedTemplateExpression(path) {
7 if (path.node.tag.name !== 'js') return;
8
9 const expressions = path.node.quasi.expressions;
10
11 const quasis = path.node.quasi.quasis.map((x) =>
12 x.value.cooked
13 .replace(/\s*[=(){},;:!]\s*/g, (x) => x.trim())
14 .replace(/\s+/g, ' ')
15 .replace(/^\s+$/g, '')
16 );
17
18 const concat = expressions.reduceRight(
19 (prev, node, i) =>
20 t.binaryExpression(
21 '+',
22 t.stringLiteral(quasis[i]),
23 t.binaryExpression('+', node, prev)
24 ),
25 t.stringLiteral(quasis[quasis.length - 1])
26 );
27
28 path.replaceWith(concat);
29 },
30 },
31});
32
33function simplifyJSTagsPlugin(opts = {}) {
34 const filter = createFilter(opts.include, opts.exclude, {
35 resolve: false,
36 });
37
38 return {
39 name: 'cleanup',
40
41 renderChunk(code, chunk) {
42 if (!filter(chunk.fileName)) {
43 return null;
44 }
45
46 return transform(code, {
47 plugins: [simplifyJSTags],
48 babelrc: false,
49 });
50 },
51 };
52}
53
54export default simplifyJSTagsPlugin;