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51 lines
1.6 KiB
JavaScript
51 lines
1.6 KiB
JavaScript
/* @flow */
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"use strict"
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const Browsers = require("autoprefixer/lib/browsers")
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const Prefixes = require("autoprefixer/lib/prefixes")
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const autoprefixer = require("autoprefixer")
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/**
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* Use Autoprefixer's secret powers to determine whether or
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* not a certain CSS identifier contains a vendor prefix that
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* Autoprefixer, given the standardized identifier, could add itself.
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*
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* Used by `*-no-vendor-prefix-*` rules to find superfluous
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* vendor prefixes.
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*/
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const prefixes = new Prefixes(autoprefixer.data.prefixes, new Browsers(autoprefixer.data.browsers, []))
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/**
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* Most identifier types have to be looked up in a unique way,
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* so we're exposing special functions for each.
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*/
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module.exports = {
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atRuleName(identifier/*: string*/)/*: boolean*/ {
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return prefixes.remove[`@${identifier.toLowerCase()}`]
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},
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selector(identifier/*: string*/)/*: boolean*/ {
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return prefixes.remove.selectors.some(selectorObj => {
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return identifier.toLowerCase() === selectorObj.prefixed
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})
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},
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mediaFeatureName(identifier/*: string*/)/*: boolean*/ {
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return identifier.toLowerCase().indexOf("device-pixel-ratio") !== -1
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},
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property(identifier/*: string*/)/*: boolean*/ {
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return autoprefixer.data.prefixes[prefixes.unprefixed(identifier.toLowerCase())]
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},
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propertyValue(prop/*: string*/, value/*: string*/)/*: boolean*/ {
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const possiblePrefixableValues = prefixes.remove[prop.toLowerCase()] && prefixes.remove[prop.toLowerCase()].values
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return possiblePrefixableValues && possiblePrefixableValues.some(valueObj => {
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return value.toLowerCase() === valueObj.prefixed
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})
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},
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}
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