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