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index.test.js
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index.test.js
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let postcss = require('postcss')
let postcssNested = require('postcss-nested')
let plugin = require('.')
it('should be possible to load a custom nesting plugin', async () => {
let input = css`
.foo {
color: black;
@screen md {
color: blue;
}
}
`
expect(
await run(input, function (root) {
root.walkRules((rule) => {
rule.selector += '-modified'
})
})
).toMatchCss(css`
.foo-modified {
color: black;
@media screen(md) {
color: blue;
}
}
`)
})
it('should be possible to load a custom nesting plugin by name (string) instead', async () => {
let input = css`
.foo {
color: black;
@screen md {
color: blue;
}
}
`
expect(await run(input, 'postcss-nested')).toMatchCss(css`
.foo {
color: black;
}
@media screen(md) {
.foo {
color: blue;
}
}
`)
})
it('should default to the bundled postcss-nested plugin (no options)', async () => {
let input = css`
.foo {
color: black;
@screen md {
color: blue;
}
}
`
expect(await run(input)).toMatchCss(css`
.foo {
color: black;
}
@media screen(md) {
.foo {
color: blue;
}
}
`)
})
it('should default to the bundled postcss-nested plugin (empty ooptions)', async () => {
let input = css`
.foo {
color: black;
@screen md {
color: blue;
}
}
`
expect(await run(input, {})).toMatchCss(css`
.foo {
color: black;
}
@media screen(md) {
.foo {
color: blue;
}
}
`)
})
test('@screen rules are replaced with media queries', async () => {
let input = css`
.foo {
color: black;
@screen md {
color: blue;
}
}
`
expect(await run(input, postcssNested)).toMatchCss(css`
.foo {
color: black;
}
@media screen(md) {
.foo {
color: blue;
}
}
`)
})
test('@screen rules can work with `@apply`', async () => {
let input = css`
.foo {
@apply bg-black;
@screen md {
@apply bg-blue-500;
}
}
`
expect(await run(input, postcssNested)).toMatchCss(css`
.foo {
@apply bg-black;
}
@media screen(md) {
.foo {
@apply bg-blue-500;
}
}
`)
})
// ---
function indentRecursive(node, indent = 0) {
node.each &&
node.each((child, i) => {
if (!child.raws.before || child.raws.before.includes('\n')) {
child.raws.before = `\n${node.type !== 'rule' && i > 0 ? '\n' : ''}${' '.repeat(indent)}`
}
child.raws.after = `\n${' '.repeat(indent)}`
indentRecursive(child, indent + 1)
})
}
function formatNodes(root) {
indentRecursive(root)
if (root.first) {
root.first.raws.before = ''
}
}
async function run(input, options) {
return (
await postcss([options === undefined ? plugin : plugin(options), formatNodes]).process(input, {
from: undefined,
})
).toString()
}
function css(templates) {
return templates.join('')
}