| Path : /var/www/html/www.netippbx.net/netippbx/node_modules/tailwindcss/src/lib/ |
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| Current File : /var/www/html/www.netippbx.net/netippbx/node_modules/tailwindcss/src/lib/cacheInvalidation.js |
import crypto from 'crypto'
import * as sharedState from './sharedState'
/**
* Calculate the hash of a string.
*
* This doesn't need to be cryptographically secure or
* anything like that since it's used only to detect
* when the CSS changes to invalidate the context.
*
* This is wrapped in a try/catch because it's really dependent
* on how Node itself is build and the environment and OpenSSL
* version / build that is installed on the user's machine.
*
* Based on the environment this can just outright fail.
*
* See https://github.com/nodejs/node/issues/40455
*
* @param {string} str
*/
function getHash(str) {
try {
return crypto.createHash('md5').update(str, 'utf-8').digest('binary')
} catch (err) {
return ''
}
}
/**
* Determine if the CSS tree is different from the
* previous version for the given `sourcePath`.
*
* @param {string} sourcePath
* @param {import('postcss').Node} root
*/
export function hasContentChanged(sourcePath, root) {
let css = root.toString()
// We only care about files with @tailwind directives
// Other files use an existing context
if (!css.includes('@tailwind')) {
return false
}
let existingHash = sharedState.sourceHashMap.get(sourcePath)
let rootHash = getHash(css)
let didChange = existingHash !== rootHash
sharedState.sourceHashMap.set(sourcePath, rootHash)
return didChange
}