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setupTrackingContext.js
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setupTrackingContext.js
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// @ts-check
import fs from 'fs'
import LRU from '@alloc/quick-lru'
import hash from '../util/hashConfig'
import resolveConfig from '../public/resolve-config'
import resolveConfigPath from '../util/resolveConfigPath'
import { getContext, getFileModifiedMap } from './setupContextUtils'
import parseDependency from '../util/parseDependency'
import { validateConfig } from '../util/validateConfig.js'
import { parseCandidateFiles, resolvedChangedContent } from './content.js'
import { loadConfig } from '../lib/load-config'
import getModuleDependencies from './getModuleDependencies'
let configPathCache = new LRU({ maxSize: 100 })
let candidateFilesCache = new WeakMap()
function getCandidateFiles(context, tailwindConfig) {
if (candidateFilesCache.has(context)) {
return candidateFilesCache.get(context)
}
let candidateFiles = parseCandidateFiles(context, tailwindConfig)
return candidateFilesCache.set(context, candidateFiles).get(context)
}
// Get the config object based on a path
function getTailwindConfig(configOrPath) {
let userConfigPath = resolveConfigPath(configOrPath)
if (userConfigPath !== null) {
let [prevConfig, prevConfigHash, prevDeps, prevModified] =
configPathCache.get(userConfigPath) || []
let newDeps = getModuleDependencies(userConfigPath)
let modified = false
let newModified = new Map()
for (let file of newDeps) {
let time = fs.statSync(file).mtimeMs
newModified.set(file, time)
if (!prevModified || !prevModified.has(file) || time > prevModified.get(file)) {
modified = true
}
}
// It hasn't changed (based on timestamps)
if (!modified) {
return [prevConfig, userConfigPath, prevConfigHash, prevDeps]
}
// It has changed (based on timestamps), or first run
for (let file of newDeps) {
delete require.cache[file]
}
let newConfig = validateConfig(resolveConfig(loadConfig(userConfigPath)))
let newHash = hash(newConfig)
configPathCache.set(userConfigPath, [newConfig, newHash, newDeps, newModified])
return [newConfig, userConfigPath, newHash, newDeps]
}
// It's a plain object, not a path
let newConfig = resolveConfig(configOrPath?.config ?? configOrPath ?? {})
newConfig = validateConfig(newConfig)
return [newConfig, null, hash(newConfig), []]
}
// DISABLE_TOUCH = TRUE
// Retrieve an existing context from cache if possible (since contexts are unique per
// source path), or set up a new one (including setting up watchers and registering
// plugins) then return it
export default function setupTrackingContext(configOrPath) {
return ({ tailwindDirectives, registerDependency }) => {
return (root, result) => {
let [tailwindConfig, userConfigPath, tailwindConfigHash, configDependencies] =
getTailwindConfig(configOrPath)
let contextDependencies = new Set(configDependencies)
// If there are no @tailwind or @apply rules, we don't consider this CSS
// file or its dependencies to be dependencies of the context. Can reuse
// the context even if they change. We may want to think about `@layer`
// being part of this trigger too, but it's tough because it's impossible
// for a layer in one file to end up in the actual @tailwind rule in
// another file since independent sources are effectively isolated.
if (tailwindDirectives.size > 0) {
// Add current css file as a context dependencies.
contextDependencies.add(result.opts.from)
// Add all css @import dependencies as context dependencies.
for (let message of result.messages) {
if (message.type === 'dependency') {
contextDependencies.add(message.file)
}
}
}
let [context, , mTimesToCommit] = getContext(
root,
result,
tailwindConfig,
userConfigPath,
tailwindConfigHash,
contextDependencies
)
let fileModifiedMap = getFileModifiedMap(context)
let candidateFiles = getCandidateFiles(context, tailwindConfig)
// If there are no @tailwind or @apply rules, we don't consider this CSS file or it's
// dependencies to be dependencies of the context. Can reuse the context even if they change.
// We may want to think about `@layer` being part of this trigger too, but it's tough
// because it's impossible for a layer in one file to end up in the actual @tailwind rule
// in another file since independent sources are effectively isolated.
if (tailwindDirectives.size > 0) {
// Add template paths as postcss dependencies.
for (let contentPath of candidateFiles) {
for (let dependency of parseDependency(contentPath)) {
registerDependency(dependency)
}
}
let [changedContent, contentMTimesToCommit] = resolvedChangedContent(
context,
candidateFiles,
fileModifiedMap
)
for (let content of changedContent) {
context.changedContent.push(content)
}
// Add the mtimes of the content files to the commit list
// We can overwrite the existing values because unconditionally
// This is because:
// 1. Most of the files here won't be in the map yet
// 2. If they are that means it's a context dependency
// and we're reading this after the context. This means
// that the mtime we just read is strictly >= the context
// mtime. Unless the user / os is doing something weird
// in which the mtime would be going backwards. If that
// happens there's already going to be problems.
for (let [path, mtime] of contentMTimesToCommit.entries()) {
mTimesToCommit.set(path, mtime)
}
}
for (let file of configDependencies) {
registerDependency({ type: 'dependency', file })
}
// "commit" the new modified time for all context deps
// We do this here because we want content tracking to
// read the "old" mtime even when it's a context dependency.
for (let [path, mtime] of mTimesToCommit.entries()) {
fileModifiedMap.set(path, mtime)
}
return context
}
}
}