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import { flagEnabled } from '../featureFlags'
import log, { dim } from './log'
export function normalizeConfig(config) {
// Quick structure validation
/**
* type FilePath = string
* type RawFile = { raw: string, extension?: string }
* type ExtractorFn = (content: string) => Array<string>
* type TransformerFn = (content: string) => string
*
* type Content =
* | Array<FilePath | RawFile>
* | {
* files: Array<FilePath | RawFile>,
* extract?: ExtractorFn | { [extension: string]: ExtractorFn }
* transform?: TransformerFn | { [extension: string]: TransformerFn }
* }
*/
let valid = (() => {
// `config.purge` should not exist anymore
if (config.purge) {
return false
}
// `config.content` should exist
if (!config.content) {
return false
}
// `config.content` should be an object or an array
if (
!Array.isArray(config.content) &&
!(typeof config.content === 'object' && config.content !== null)
) {
return false
}
// When `config.content` is an array, it should consist of FilePaths or RawFiles
if (Array.isArray(config.content)) {
return config.content.every((path) => {
// `path` can be a string
if (typeof path === 'string') return true
// `path` can be an object { raw: string, extension?: string }
// `raw` must be a string
if (typeof path?.raw !== 'string') return false
// `extension` (if provided) should also be a string
if (path?.extension && typeof path?.extension !== 'string') {
return false
}
return true
})
}
// When `config.content` is an object
if (typeof config.content === 'object' && config.content !== null) {
// Only `files`, `relative`, `extract`, and `transform` can exist in `config.content`
if (
Object.keys(config.content).some(
(key) => !['files', 'relative', 'extract', 'transform'].includes(key)
)
) {
return false
}
// `config.content.files` should exist of FilePaths or RawFiles
if (Array.isArray(config.content.files)) {
if (
!config.content.files.every((path) => {
// `path` can be a string
if (typeof path === 'string') return true
// `path` can be an object { raw: string, extension?: string }
// `raw` must be a string
if (typeof path?.raw !== 'string') return false
// `extension` (if provided) should also be a string
if (path?.extension && typeof path?.extension !== 'string') {
return false
}
return true
})
) {
return false
}
// `config.content.extract` is optional, and can be a Function or a Record<String, Function>
if (typeof config.content.extract === 'object') {
for (let value of Object.values(config.content.extract)) {
if (typeof value !== 'function') {
return false
}
}
} else if (
!(config.content.extract === undefined || typeof config.content.extract === 'function')
) {
return false
}
// `config.content.transform` is optional, and can be a Function or a Record<String, Function>
if (typeof config.content.transform === 'object') {
for (let value of Object.values(config.content.transform)) {
if (typeof value !== 'function') {
return false
}
}
} else if (
!(
config.content.transform === undefined || typeof config.content.transform === 'function'
)
) {
return false
}
// `config.content.relative` is optional and can be a boolean
if (
typeof config.content.relative !== 'boolean' &&
typeof config.content.relative !== 'undefined'
) {
return false
}
}
return true
}
return false
})()
if (!valid) {
log.warn('purge-deprecation', [
'The `purge`/`content` options have changed in Tailwind CSS v3.0.',
'Update your configuration file to eliminate this warning.',
'https://tailwindcss.com/docs/upgrade-guide#configure-content-sources',
])
}
// Normalize the `safelist`
config.safelist = (() => {
let { content, purge, safelist } = config
if (Array.isArray(safelist)) return safelist
if (Array.isArray(content?.safelist)) return content.safelist
if (Array.isArray(purge?.safelist)) return purge.safelist
if (Array.isArray(purge?.options?.safelist)) return purge.options.safelist
return []
})()
// Normalize the `blocklist`
config.blocklist = (() => {
let { blocklist } = config
if (Array.isArray(blocklist)) {
if (blocklist.every((item) => typeof item === 'string')) {
return blocklist
}
log.warn('blocklist-invalid', [
'The `blocklist` option must be an array of strings.',
'https://tailwindcss.com/docs/content-configuration#discarding-classes',
])
}
return []
})()
// Normalize prefix option
if (typeof config.prefix === 'function') {
log.warn('prefix-function', [
'As of Tailwind CSS v3.0, `prefix` cannot be a function.',
'Update `prefix` in your configuration to be a string to eliminate this warning.',
'https://tailwindcss.com/docs/upgrade-guide#prefix-cannot-be-a-function',
])
config.prefix = ''
} else {
config.prefix = config.prefix ?? ''
}
// Normalize the `content`
config.content = {
relative: (() => {
let { content } = config
if (content?.relative) {
return content.relative
}
return flagEnabled(config, 'relativeContentPathsByDefault')
})(),
files: (() => {
let { content, purge } = config
if (Array.isArray(purge)) return purge
if (Array.isArray(purge?.content)) return purge.content
if (Array.isArray(content)) return content
if (Array.isArray(content?.content)) return content.content
if (Array.isArray(content?.files)) return content.files
return []
})(),
extract: (() => {
let extract = (() => {
if (config.purge?.extract) return config.purge.extract
if (config.content?.extract) return config.content.extract
if (config.purge?.extract?.DEFAULT) return config.purge.extract.DEFAULT
if (config.content?.extract?.DEFAULT) return config.content.extract.DEFAULT
if (config.purge?.options?.extractors) return config.purge.options.extractors
if (config.content?.options?.extractors) return config.content.options.extractors
return {}
})()
let extractors = {}
let defaultExtractor = (() => {
if (config.purge?.options?.defaultExtractor) {
return config.purge.options.defaultExtractor
}
if (config.content?.options?.defaultExtractor) {
return config.content.options.defaultExtractor
}
return undefined
})()
if (defaultExtractor !== undefined) {
extractors.DEFAULT = defaultExtractor
}
// Functions
if (typeof extract === 'function') {
extractors.DEFAULT = extract
}
// Arrays
else if (Array.isArray(extract)) {
for (let { extensions, extractor } of extract ?? []) {
for (let extension of extensions) {
extractors[extension] = extractor
}
}
}
// Objects
else if (typeof extract === 'object' && extract !== null) {
Object.assign(extractors, extract)
}
return extractors
})(),
transform: (() => {
let transform = (() => {
if (config.purge?.transform) return config.purge.transform
if (config.content?.transform) return config.content.transform
if (config.purge?.transform?.DEFAULT) return config.purge.transform.DEFAULT
if (config.content?.transform?.DEFAULT) return config.content.transform.DEFAULT
return {}
})()
let transformers = {}
if (typeof transform === 'function') {
transformers.DEFAULT = transform
} else if (typeof transform === 'object' && transform !== null) {
Object.assign(transformers, transform)
}
return transformers
})(),
}
// Validate globs to prevent bogus globs.
// E.g.: `./src/*.{html}` is invalid, the `{html}` should just be `html`
for (let file of config.content.files) {
if (typeof file === 'string' && /{([^,]*?)}/g.test(file)) {
log.warn('invalid-glob-braces', [
`The glob pattern ${dim(file)} in your Tailwind CSS configuration is invalid.`,
`Update it to ${dim(file.replace(/{([^,]*?)}/g, '$1'))} to silence this warning.`,
// TODO: Add https://tw.wtf/invalid-glob-braces
])
break
}
}
return config
}