diff --git a/__tests__/generateModules.test.js b/__tests__/generateModules.test.js
deleted file mode 100644
index d9fdb1dff..000000000
--- a/__tests__/generateModules.test.js
+++ /dev/null
@@ -1,133 +0,0 @@
-import generateModules from '../src/util/generateModules'
-import defineClasses from '../src/util/defineClasses'
-
-function textAlign() {
-  return defineClasses({
-    'text-left': { 'text-align': 'left' },
-    'text-right': { 'text-align': 'right' },
-    'text-center': { 'text-align': 'center' },
-  })
-}
-
-function display() {
-  return defineClasses({
-    block: { display: 'block' },
-    inline: { display: 'inline' },
-    'inline-block': { display: 'inline-block' },
-  })
-}
-
-function borderStyle() {
-  return defineClasses({
-    'border-solid': { 'border-style': 'solid' },
-    'border-dashed': { 'border-style': 'dashed' },
-    'border-dotted': { 'border-style': 'dotted' },
-  })
-}
-
-test('an empty variants list generates a @variants at-rule with no parameters', () => {
-  const result = generateModules([{ name: 'textAlign', generator: textAlign }], {
-    textAlign: [],
-  })
-
-  const expected = `
-    @variants {
-      .text-left { text-align: left }
-      .text-right { text-align: right }
-      .text-center { text-align: center }
-    }
-  `
-  expect(result.toString()).toMatchCss(expected)
-})
-
-test('a `false` variants list generates no output', () => {
-  const result = generateModules([{ name: 'textAlign', generator: textAlign }], {
-    textAlign: false,
-  })
-
-  expect(result.toString()).toMatchCss('')
-})
-
-test('specified variants are included in the @variants at-rule', () => {
-  const result = generateModules([{ name: 'textAlign', generator: textAlign }], {
-    textAlign: ['responsive', 'hover'],
-  })
-
-  const expected = `
-    @variants responsive, hover {
-      .text-left { text-align: left }
-      .text-right { text-align: right }
-      .text-center { text-align: center }
-    }
-  `
-  expect(result.toString()).toMatchCss(expected)
-})
-
-test('options must provide variants for every module', () => {
-  expect(() => {
-    generateModules(
-      [{ name: 'textAlign', generator: textAlign }, { name: 'display', generator: display }],
-      {
-        textAlign: [],
-      }
-    )
-  }).toThrow()
-})
-
-test('variants can be different for each module', () => {
-  const result = generateModules(
-    [
-      { name: 'textAlign', generator: textAlign },
-      { name: 'display', generator: display },
-      { name: 'borderStyle', generator: borderStyle },
-    ],
-    {
-      textAlign: [],
-      display: false,
-      borderStyle: ['responsive', 'hover', 'focus'],
-    }
-  )
-
-  const expected = `
-    @variants {
-      .text-left { text-align: left }
-      .text-right { text-align: right }
-      .text-center { text-align: center }
-    }
-
-    @variants responsive, hover, focus {
-      .border-solid { border-style: solid }
-      .border-dashed { border-style: dashed }
-      .border-dotted { border-style: dotted }
-    }
-  `
-  expect(result.toString()).toMatchCss(expected)
-})
-
-test('generators can reference the generatorOptions object', () => {
-  const result = generateModules(
-    [
-      {
-        name: 'parameterized',
-        generator: generatorParams => {
-          return defineClasses({
-            foo: { color: generatorParams.color },
-          })
-        },
-      },
-    ],
-    {
-      parameterized: [],
-    },
-    {
-      color: 'blue',
-    }
-  )
-
-  const expected = `
-    @variants {
-      .foo { color: blue }
-    }
-  `
-  expect(result.toString()).toMatchCss(expected)
-})
diff --git a/src/util/generateModules.js b/src/util/generateModules.js
deleted file mode 100644
index 060f12943..000000000
--- a/src/util/generateModules.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import _ from 'lodash'
-import postcss from 'postcss'
-import wrapWithVariants from '../util/wrapWithVariants'
-
-export default function(modules, moduleOptions, generatorOptions = {}) {
-  modules.forEach(module => {
-    if (!_.has(moduleOptions, module.name)) {
-      throw new Error(`Module \`${module.name}\` is missing from moduleOptions.`)
-    }
-  })
-
-  return postcss.root({
-    nodes: _(modules)
-      .reject(module => moduleOptions[module.name] === false)
-      .flatMap(module =>
-        wrapWithVariants(module.generator(generatorOptions), moduleOptions[module.name])
-      )
-      .value(),
-  })
-}