Make resolveConfig compatible with feature flag configs (#2347)

* Make resolveConfig compatible with feature flag configs

* Update changelog

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-- Nothing yet!
+- Fix issue where `resolveConfig` didn't take into account configs added by feature flags ([#2347](https://github.com/tailwindlabs/tailwindcss/pull/2347))
 
 ## [1.8.4] - 2020-09-06
 

resolveConfig.js

@@ -1,6 +1,11 @@
 const resolveConfigObjects = require('./lib/util/resolveConfig').default
-const defaultConfig = require('./stubs/defaultConfig.stub.js')
+const getAllConfigs = require('./lib/util/getAllConfigs').default
 
 module.exports = function resolveConfig(...configs) {
-  return resolveConfigObjects([...configs, defaultConfig])
+  // Make sure the correct config object is mutated to include flagged config plugins.
+  // This sucks, refactor soon.
+  const firstConfigWithPlugins = configs.find(c => Array.isArray(c.plugins)) || configs[0]
+  const [, ...defaultConfigs] = getAllConfigs(firstConfigWithPlugins)
+
+  return resolveConfigObjects([...configs, ...defaultConfigs])
 }

src/index.js

@@ -9,49 +9,9 @@ import registerConfigAsDependency from './lib/registerConfigAsDependency'
 import processTailwindFeatures from './processTailwindFeatures'
 import formatCSS from './lib/formatCSS'
 import resolveConfig from './util/resolveConfig'
+import getAllConfigs from './util/getAllConfigs'
 import { defaultConfigFile } from './constants'
 import defaultConfig from '../stubs/defaultConfig.stub.js'
-import { flagEnabled } from './featureFlags'
-
-import uniformColorPalette from './flagged/uniformColorPalette.js'
-import extendedSpacingScale from './flagged/extendedSpacingScale.js'
-import defaultLineHeights from './flagged/defaultLineHeights.js'
-import extendedFontSizeScale from './flagged/extendedFontSizeScale.js'
-import darkModeVariant from './flagged/darkModeVariant.js'
-import standardFontWeights from './flagged/standardFontWeights'
-
-function getAllConfigs(config) {
-  const configs = [defaultConfig]
-
-  if (flagEnabled(config, 'uniformColorPalette')) {
-    configs.unshift(uniformColorPalette)
-  }
-
-  if (flagEnabled(config, 'extendedSpacingScale')) {
-    configs.unshift(extendedSpacingScale)
-  }
-
-  if (flagEnabled(config, 'defaultLineHeights')) {
-    configs.unshift(defaultLineHeights)
-  }
-
-  if (flagEnabled(config, 'extendedFontSizeScale')) {
-    configs.unshift(extendedFontSizeScale)
-  }
-
-  if (flagEnabled(config, 'standardFontWeights')) {
-    configs.unshift(standardFontWeights)
-  }
-
-  if (flagEnabled(config, 'darkModeVariant')) {
-    configs.unshift(darkModeVariant)
-    if (Array.isArray(config.plugins)) {
-      config.plugins = [...darkModeVariant.plugins, ...config.plugins]
-    }
-  }
-
-  return [config, ...configs]
-}
 
 function resolveConfigPath(filePath) {
   // require('tailwindcss')({ theme: ..., variants: ... })

src/util/getAllConfigs.js

@@ -0,0 +1,41 @@
+import defaultConfig from '../../stubs/defaultConfig.stub.js'
+import { flagEnabled } from '../featureFlags'
+import uniformColorPalette from '../flagged/uniformColorPalette.js'
+import extendedSpacingScale from '../flagged/extendedSpacingScale.js'
+import defaultLineHeights from '../flagged/defaultLineHeights.js'
+import extendedFontSizeScale from '../flagged/extendedFontSizeScale.js'
+import darkModeVariant from '../flagged/darkModeVariant.js'
+import standardFontWeights from '../flagged/standardFontWeights'
+
+export default function getAllConfigs(config) {
+  const configs = [defaultConfig]
+
+  if (flagEnabled(config, 'uniformColorPalette')) {
+    configs.unshift(uniformColorPalette)
+  }
+
+  if (flagEnabled(config, 'extendedSpacingScale')) {
+    configs.unshift(extendedSpacingScale)
+  }
+
+  if (flagEnabled(config, 'defaultLineHeights')) {
+    configs.unshift(defaultLineHeights)
+  }
+
+  if (flagEnabled(config, 'extendedFontSizeScale')) {
+    configs.unshift(extendedFontSizeScale)
+  }
+
+  if (flagEnabled(config, 'standardFontWeights')) {
+    configs.unshift(standardFontWeights)
+  }
+
+  if (flagEnabled(config, 'darkModeVariant')) {
+    configs.unshift(darkModeVariant)
+    if (Array.isArray(config.plugins)) {
+      config.plugins = [...darkModeVariant.plugins, ...config.plugins]
+    }
+  }
+
+  return [config, ...configs]
+}