diff --git a/src/helpers/postcss_plugin.js b/src/helpers/postcss_plugin.js
index b72e09f9..bc9945dd 100644
--- a/src/helpers/postcss_plugin.js
+++ b/src/helpers/postcss_plugin.js
@@ -10,7 +10,7 @@
  * @param {(Function|Object)} func Function with PostCSS plugin interface.
  * @returns {Function} A PostCSS plugin.
  */
-function plugin(name, func) {
+export function plugin(name, func) {
   return Object.defineProperty(
     function intrface(...args) {
       const retFunc = func.apply(this, args)
diff --git a/src/helpers/split.js b/src/helpers/split.js
index 9a1711f8..c8844394 100644
--- a/src/helpers/split.js
+++ b/src/helpers/split.js
@@ -2,14 +2,13 @@
 /**
  * Split array into multiple arrays by specified condition.
  *
- * @alias module:helpers/split
  * @param {Array} arr Target array.
  * @param {splitCallback} func Callback to split array.
  * @param {boolean} [keepSplitedValue=false] Keep splited value. The split
  *     point is before the matched value.
  * @returns {Array[]} Splited array.
  */
-function split(arr, func, keepSplitedValue = false) {
+export function split(arr, func, keepSplitedValue = false) {
   const ret = [[]]
 
   for (const value of arr) {
diff --git a/src/helpers/wrap_array.js b/src/helpers/wrap_array.js
index 1cc17e67..e0182104 100644
--- a/src/helpers/wrap_array.js
+++ b/src/helpers/wrap_array.js
@@ -2,11 +2,11 @@
 /**
  * Wrap value in array if it is not an array.
  *
- * @alias module:helpers/wrap_array
+ * @function wrapArray
  * @param  {*} valOrArr
  * @return {Array}
  */
-const wrapArray = (valOrArr) => {
+export const wrapArray = (valOrArr) => {
   if (valOrArr == null || valOrArr === false) return []
   if (valOrArr instanceof Array) return valOrArr
   return [valOrArr]
diff --git a/src/helpers/wrap_tokens.js b/src/helpers/wrap_tokens.js
index ab1b1c26..ac8e1b7d 100644
--- a/src/helpers/wrap_tokens.js
+++ b/src/helpers/wrap_tokens.js
@@ -3,7 +3,6 @@
 /**
  * Wrap array of tokens by specified container object.
  *
- * @alias module:helpers/wrap_tokens
  * @param {Token} Token markdown-it's Token class.
  * @param {String} type Token type. It will be suffixed by `_open` / `_close`.
  * @param {Object} container A container object to wrap tokens, includes tag
@@ -14,7 +13,7 @@
  * @param {Token[]} [tokens=[]] Wrapping tokens.
  * @returns {Token[]} Wrapped tokens.
  */
-function wrapTokens(Token, type, container, tokens = []) {
+export function wrapTokens(Token, type, container, tokens = []) {
   const { tag } = container
 
   // Update nesting level of wrapping tokens
diff --git a/src/markdown/background_image.js b/src/markdown/background_image.js
index 0f2884ef..246b7b09 100644
--- a/src/markdown/background_image.js
+++ b/src/markdown/background_image.js
@@ -17,13 +17,14 @@ import parse from './background_image/parse'
  * In addition to the basic background implementation, it supports multiple
  * background images, filters, and split background.
  *
- * @alias module:markdown/background_image
+ * @function backgroundImage
  * @param {MarkdownIt} md markdown-it instance.
  */
-function backgroundImage(md) {
+function _backgroundImage(md) {
   parse(md)
   apply(md)
   advanced(md)
 }
 
-export default marpitPlugin(backgroundImage)
+export const backgroundImage = marpitPlugin(_backgroundImage)
+export default backgroundImage
diff --git a/src/markdown/background_image/advanced.js b/src/markdown/background_image/advanced.js
index 0aa3c4ff..eb9db0f7 100644
--- a/src/markdown/background_image/advanced.js
+++ b/src/markdown/background_image/advanced.js
@@ -1,6 +1,6 @@
 /** @module */
 import InlineStyle from '../../helpers/inline_style'
-import wrapTokens from '../../helpers/wrap_tokens'
+import { wrapTokens } from '../../helpers/wrap_tokens'
 import marpitPlugin from '../../plugin'
 
 /**
@@ -10,10 +10,10 @@ import marpitPlugin from '../../plugin'
  * element(s) instead of CSS backgrounds. It works by creating the isolated
  * layer into inline SVG.
  *
- * @alias module:markdown/background_image/advanced
+ * @function advancedBackground
  * @param {MarkdownIt} md markdown-it instance.
  */
-function advancedBackground(md) {
+function _advancedBackground(md) {
   md.core.ruler.after(
     'marpit_directives_apply',
     'marpit_advanced_background',
@@ -157,4 +157,5 @@ function advancedBackground(md) {
   )
 }
 
-export default marpitPlugin(advancedBackground)
+export const advancedBackground = marpitPlugin(_advancedBackground)
+export default advancedBackground
diff --git a/src/markdown/background_image/apply.js b/src/markdown/background_image/apply.js
index d51bb888..00dcdce7 100644
--- a/src/markdown/background_image/apply.js
+++ b/src/markdown/background_image/apply.js
@@ -9,10 +9,10 @@ import marpitPlugin from '../../plugin'
  * When inline SVG is enabled, it will reshape meta for advanced process instead
  * of converting to directives.
  *
- * @alias module:markdown/background_image/apply
+ * @function backgroundImageApply
  * @param {MarkdownIt} md markdown-it instance.
  */
-function backgroundImageApply(md) {
+function _backgroundImageApply(md) {
   md.core.ruler.after(
     'marpit_inline_svg',
     'marpit_apply_background_image',
@@ -115,4 +115,5 @@ function backgroundImageApply(md) {
   )
 }
 
-export default marpitPlugin(backgroundImageApply)
+export const backgroundImageApply = marpitPlugin(_backgroundImageApply)
+export default backgroundImageApply
diff --git a/src/markdown/background_image/parse.js b/src/markdown/background_image/parse.js
index 91a69d7e..f88a9ef4 100644
--- a/src/markdown/background_image/parse.js
+++ b/src/markdown/background_image/parse.js
@@ -18,10 +18,10 @@ const splitSizeMatcher = /^(left|right)(?::((?:\d*\.)?\d+%))?$/
  *
  * Furthermore, it parses additional keywords needed for background image.
  *
- * @alias module:markdown/background_image/parse
+ * @function backgroundImageParse
  * @param {MarkdownIt} md markdown-it instance.
  */
-function backgroundImageParse(md) {
+function _backgroundImageParse(md) {
   md.inline.ruler2.after(
     'marpit_parse_image',
     'marpit_background_image',
@@ -75,4 +75,5 @@ function backgroundImageParse(md) {
   )
 }
 
-export default marpitPlugin(backgroundImageParse)
+export const backgroundImageParse = marpitPlugin(_backgroundImageParse)
+export default backgroundImageParse
diff --git a/src/markdown/collect.js b/src/markdown/collect.js
index 154018d4..a9e457fa 100644
--- a/src/markdown/collect.js
+++ b/src/markdown/collect.js
@@ -9,10 +9,10 @@ import marpitPlugin from '../plugin'
  * Marpit instance. It would use in the returned object from
  * {@link Marpit#render}.
  *
- * @alias module:markdown/collect
+ * @function collect
  * @param {MarkdownIt} md markdown-it instance.
  */
-function collect(md) {
+function _collect(md) {
   const { marpit } = md
 
   md.core.ruler.push('marpit_collect', (state) => {
@@ -61,4 +61,5 @@ function collect(md) {
   })
 }
 
-export default marpitPlugin(collect)
+export const collect = marpitPlugin(_collect)
+export default collect
diff --git a/src/markdown/comment.js b/src/markdown/comment.js
index a5700634..f5d78292 100644
--- a/src/markdown/comment.js
+++ b/src/markdown/comment.js
@@ -1,6 +1,6 @@
 /** @module */
 import marpitPlugin from '../plugin'
-import yaml from './directives/yaml'
+import { yaml } from './directives/yaml'
 
 const commentMatcher = /<!--+\s*([\s\S]*?)\s*--+>/
 const commentMatcherOpening = /^<!--/
@@ -28,10 +28,10 @@ export function markAsParsed(token, kind) {
  * Parse HTML comment as token. Comments will strip regardless of html setting
  * provided by markdown-it.
  *
- * @alias module:markdown/comment
+ * @function comment
  * @param {MarkdownIt} md markdown-it instance.
  */
-function comment(md) {
+function _comment(md) {
   const parse = (token, content) => {
     const parsed = yaml(content, !!md.marpit.options.looseYAML)
 
@@ -126,4 +126,5 @@ function comment(md) {
   )
 }
 
-export default marpitPlugin(comment)
+export const comment = marpitPlugin(_comment)
+export default comment
diff --git a/src/markdown/container.js b/src/markdown/container.js
index eaa0b3ea..8ebf5546 100644
--- a/src/markdown/container.js
+++ b/src/markdown/container.js
@@ -1,15 +1,15 @@
 /** @module */
-import wrapArray from '../helpers/wrap_array'
-import wrapTokens from '../helpers/wrap_tokens'
+import { wrapArray } from '../helpers/wrap_array'
+import { wrapTokens } from '../helpers/wrap_tokens'
 import marpitPlugin from '../plugin'
 
 /**
  * Marpit container plugin.
  *
- * @alias module:markdown/container
+ * @function container
  * @param {MarkdownIt} md markdown-it instance.
  */
-function container(md) {
+function _container(md) {
   const containers = wrapArray(md.marpit.options.container)
   if (!containers) return
 
@@ -28,4 +28,5 @@ function container(md) {
   })
 }
 
-export default marpitPlugin(container)
+export const container = marpitPlugin(_container)
+export default container
diff --git a/src/markdown/directives/apply.js b/src/markdown/directives/apply.js
index 49e8d80a..d481d765 100644
--- a/src/markdown/directives/apply.js
+++ b/src/markdown/directives/apply.js
@@ -7,7 +7,7 @@ import builtInDirectives from './directives'
 /**
  * Apply parsed Marpit directives to markdown-it tokens.
  *
- * @alias module:markdown/directives/apply
+ * @function apply
  * @param {MarkdownIt} md markdown-it instance.
  * @param {Object} [opts]
  * @param {boolean} [opts.dataset=true] Assigns directives as HTML data
@@ -15,7 +15,7 @@ import builtInDirectives from './directives'
  * @param {boolean} [opts.css=true] Assigns directives as CSS Custom Properties
  *     of each section tag.
  */
-function apply(md, opts = {}) {
+function _apply(md, opts = {}) {
   const { marpit } = md
 
   const dataset = opts.dataset === undefined ? true : !!opts.dataset
@@ -103,4 +103,5 @@ function apply(md, opts = {}) {
   )
 }
 
-export default marpitPlugin(apply)
+export const apply = marpitPlugin(_apply)
+export default apply
diff --git a/src/markdown/directives/parse.js b/src/markdown/directives/parse.js
index 110ee34f..e8dca8bf 100644
--- a/src/markdown/directives/parse.js
+++ b/src/markdown/directives/parse.js
@@ -3,7 +3,7 @@ import MarkdownItFrontMatter from 'markdown-it-front-matter'
 import marpitPlugin from '../../plugin'
 import { markAsParsed } from '../comment'
 import * as directives from './directives'
-import yaml from './yaml'
+import { yaml } from './yaml'
 
 const isDirectiveComment = (token) =>
   token.type === 'marpit_comment' && token.meta.marpitParsedDirectives
@@ -14,14 +14,14 @@ const isDirectiveComment = (token) =>
  * Marpit comment plugin ans slide plugin requires already loaded to
  * markdown-it instance.
  *
- * @alias module:markdown/directives/parse
+ * @function parse
  * @param {MarkdownIt} md markdown-it instance.
  * @param {Object} [opts]
  * @param {boolean} [opts.frontMatter=true] Switch feature to support YAML
  *     front-matter. If true, you can use Jekyll style directive setting to the
  *     first page.
  */
-function parse(md, opts = {}) {
+function _parse(md, opts = {}) {
   const { marpit } = md
 
   const applyBuiltinDirectives = (newProps, builtinDirectives) => {
@@ -213,4 +213,5 @@ function parse(md, opts = {}) {
   })
 }
 
-export default marpitPlugin(parse)
+export const parse = marpitPlugin(_parse)
+export default parse
diff --git a/src/markdown/directives/yaml.js b/src/markdown/directives/yaml.js
index 94835323..b3d1f121 100644
--- a/src/markdown/directives/yaml.js
+++ b/src/markdown/directives/yaml.js
@@ -54,7 +54,7 @@ function convertLoose(text, looseDirectives) {
 /**
  * Parse text as YAML by using js-yaml's FAILSAFE_SCHEMA.
  *
- * @alias module:markdown/directives/yaml
+ * @function yaml
  * @param {String} text Target text.
  * @param {boolean|string[]} [looseDirectives=false] By setting `true`, it try
  *     to parse as loose YAML only in defined Marpit built-in directives. You
@@ -63,7 +63,7 @@ function convertLoose(text, looseDirectives) {
  * @returns {Object|false} Return parse result, or `false` when failed to parse.
  */
 
-export default (text, looseDirectives = false) =>
+export const yaml = (text, looseDirectives = false) =>
   parse(
     looseDirectives
       ? convertLoose(text, [
@@ -72,3 +72,5 @@ export default (text, looseDirectives = false) =>
         ])
       : text
   )
+
+export default yaml
diff --git a/src/markdown/fragment.js b/src/markdown/fragment.js
index a5ddb741..8891ea97 100644
--- a/src/markdown/fragment.js
+++ b/src/markdown/fragment.js
@@ -6,10 +6,10 @@ const fragmentedListMarkups = ['*', ')']
 /**
  * Marpit fragment plugin.
  *
- * @alias module:markdown/fragment
+ * @function fragment
  * @param {MarkdownIt} md markdown-it instance.
  */
-function fragment(md) {
+function _fragment(md) {
   // Fragmented list
   md.core.ruler.after('marpit_directives_parse', 'marpit_fragment', (state) => {
     if (state.inlineMode) return
@@ -49,4 +49,5 @@ function fragment(md) {
   })
 }
 
-export default marpitPlugin(fragment)
+export const fragment = marpitPlugin(_fragment)
+export default fragment
diff --git a/src/markdown/header_and_footer.js b/src/markdown/header_and_footer.js
index a58b8850..efebc1ee 100644
--- a/src/markdown/header_and_footer.js
+++ b/src/markdown/header_and_footer.js
@@ -1,5 +1,5 @@
 /** @module */
-import wrapTokens from '../helpers/wrap_tokens'
+import { wrapTokens } from '../helpers/wrap_tokens'
 import marpitPlugin from '../plugin'
 
 /**
@@ -7,10 +7,10 @@ import marpitPlugin from '../plugin'
  *
  * At each slide, add header and footer that are provided by directives.
  *
- * @alias module:markdown/header_and_footer
+ * @function headerAndFooter
  * @param {MarkdownIt} md markdown-it instance.
  */
-function headerAndFooter(md) {
+function _headerAndFooter(md) {
   md.core.ruler.after(
     'marpit_directives_apply',
     'marpit_header_and_footer',
@@ -68,4 +68,5 @@ function headerAndFooter(md) {
   )
 }
 
-export default marpitPlugin(headerAndFooter)
+export const headerAndFooter = marpitPlugin(_headerAndFooter)
+export default headerAndFooter
diff --git a/src/markdown/heading_divider.js b/src/markdown/heading_divider.js
index 6efeb164..139963b5 100644
--- a/src/markdown/heading_divider.js
+++ b/src/markdown/heading_divider.js
@@ -1,5 +1,5 @@
 /** @module */
-import split from '../helpers/split'
+import { split } from '../helpers/split'
 import marpitPlugin from '../plugin'
 
 /**
@@ -8,10 +8,10 @@ import marpitPlugin from '../plugin'
  * Start a new slide page at before of headings by prepending hidden `<hr>`
  * elements.
  *
- * @alias module:markdown/heading_divider
+ * @function headingDivider
  * @param {MarkdownIt} md markdown-it instance.
  */
-function headingDivider(md) {
+function _headingDivider(md) {
   const { marpit } = md
 
   md.core.ruler.before('marpit_slide', 'marpit_heading_divider', (state) => {
@@ -56,4 +56,5 @@ function headingDivider(md) {
   })
 }
 
-export default marpitPlugin(headingDivider)
+export const headingDivider = marpitPlugin(_headingDivider)
+export default headingDivider
diff --git a/src/markdown/image.js b/src/markdown/image.js
index 6a5e43b5..5a1479c9 100644
--- a/src/markdown/image.js
+++ b/src/markdown/image.js
@@ -6,12 +6,13 @@ import parse from './image/parse'
 /**
  * Marpit image plugin.
  *
- * @alias module:markdown/image
+ * @function image
  * @param {MarkdownIt} md markdown-it instance.
  */
-function image(md) {
+function _image(md) {
   parse(md)
   apply(md)
 }
 
-export default marpitPlugin(image)
+export const image = marpitPlugin(_image)
+export default image
diff --git a/src/markdown/image/apply.js b/src/markdown/image/apply.js
index 7c6a9296..c5691e3f 100644
--- a/src/markdown/image/apply.js
+++ b/src/markdown/image/apply.js
@@ -7,10 +7,10 @@ import marpitPlugin from '../../plugin'
  *
  * Apply image style and color spot directive based on parsed meta.
  *
- * @alias module:markdown/image/apply
+ * @function applyImage
  * @param {MarkdownIt} md markdown-it instance.
  */
-function applyImage(md) {
+function _applyImage(md) {
   // Build and apply image style
   md.inline.ruler2.push('marpit_apply_image', ({ tokens }) => {
     for (const token of tokens) {
@@ -70,4 +70,5 @@ function applyImage(md) {
   )
 }
 
-export default marpitPlugin(applyImage)
+export const applyImage = marpitPlugin(_applyImage)
+export default applyImage
diff --git a/src/markdown/image/parse.js b/src/markdown/image/parse.js
index 684075c7..9414b967 100644
--- a/src/markdown/image/parse.js
+++ b/src/markdown/image/parse.js
@@ -87,10 +87,10 @@ optionMatchers.set(/^sepia(?::(.+))?$/, (matches, meta) => ({
  * image url and options. The alternative text is regarded as space-separated
  * options.
  *
- * @alias module:markdown/image/parse
+ * @function parseImage
  * @param {MarkdownIt} md markdown-it instance.
  */
-function parseImage(md) {
+function _parseImage(md) {
   const { process } = md.core
 
   // Store original URL, for the color shorthand.
@@ -238,4 +238,5 @@ function parseImage(md) {
   })
 }
 
-export default marpitPlugin(parseImage)
+export const parseImage = marpitPlugin(_parseImage)
+export default parseImage
diff --git a/src/markdown/inline_svg.js b/src/markdown/inline_svg.js
index 0626e001..bd78352d 100644
--- a/src/markdown/inline_svg.js
+++ b/src/markdown/inline_svg.js
@@ -1,15 +1,15 @@
 /** @module */
-import split from '../helpers/split'
-import wrapTokens from '../helpers/wrap_tokens'
+import { split } from '../helpers/split'
+import { wrapTokens } from '../helpers/wrap_tokens'
 import marpitPlugin from '../plugin'
 
 /**
  * Marpit Inline SVG plugin.
  *
- * @alias module:markdown/inline_svg
+ * @function inlineSVG
  * @param {MarkdownIt} md markdown-it instance.
  */
-function inlineSVG(md) {
+function _inlineSVG(md) {
   const { marpit } = md
 
   md.core.ruler.after(
@@ -64,4 +64,5 @@ function inlineSVG(md) {
   )
 }
 
-export default marpitPlugin(inlineSVG)
+export const inlineSVG = marpitPlugin(_inlineSVG)
+export default inlineSVG
diff --git a/src/markdown/slide.js b/src/markdown/slide.js
index 76e50337..71777f4e 100644
--- a/src/markdown/slide.js
+++ b/src/markdown/slide.js
@@ -1,6 +1,6 @@
 /** @module */
-import split from '../helpers/split'
-import wrapTokens from '../helpers/wrap_tokens'
+import { split } from '../helpers/split'
+import { wrapTokens } from '../helpers/wrap_tokens'
 import marpitPlugin from '../plugin'
 
 export const defaultAnchorCallback = (i) => `${i + 1}`
@@ -11,7 +11,7 @@ export const defaultAnchorCallback = (i) => `${i + 1}`
  * Split markdown-it tokens into the slides by horizontal rule. Each slides
  * will be wrapped by section element.
  *
- * @alias module:markdown/slide
+ * @function slide
  * @param {MarkdownIt} md markdown-it instance.
  * @param {Object} [opts]
  * @param {Object} [opts.attributes] The `<section>` element attributes by
@@ -20,7 +20,7 @@ export const defaultAnchorCallback = (i) => `${i + 1}`
  *     the anchor with the page number starting from 1. You can customize anchor
  *     name by passing callback function.
  */
-function slide(md, opts = {}) {
+function _slide(md, opts = {}) {
   const anchor = opts.anchor === undefined ? true : opts.anchor
 
   const anchorCallback = (() => {
@@ -74,4 +74,5 @@ function slide(md, opts = {}) {
   })
 }
 
-export default marpitPlugin(slide)
+export const slide = marpitPlugin(_slide)
+export default slide
diff --git a/src/markdown/slide_container.js b/src/markdown/slide_container.js
index 8a599308..8ea4a090 100644
--- a/src/markdown/slide_container.js
+++ b/src/markdown/slide_container.js
@@ -1,16 +1,16 @@
 /** @module */
-import split from '../helpers/split'
-import wrapArray from '../helpers/wrap_array'
-import wrapTokens from '../helpers/wrap_tokens'
+import { split } from '../helpers/split'
+import { wrapArray } from '../helpers/wrap_array'
+import { wrapTokens } from '../helpers/wrap_tokens'
 import marpitPlugin from '../plugin'
 
 /**
  * Marpit slide container plugin.
  *
- * @alias module:markdown/slide_container
+ * @function slideContainer
  * @param {MarkdownIt} md markdown-it instance.
  */
-function slideContainer(md) {
+function _slideContainer(md) {
   const containers = wrapArray(md.marpit.options.slideContainer)
   if (!containers) return
 
@@ -40,4 +40,5 @@ function slideContainer(md) {
   })
 }
 
-export default marpitPlugin(slideContainer)
+export const slideContainer = marpitPlugin(_slideContainer)
+export default slideContainer
diff --git a/src/markdown/style/assign.js b/src/markdown/style/assign.js
index c8294e09..d4a55276 100644
--- a/src/markdown/style/assign.js
+++ b/src/markdown/style/assign.js
@@ -66,10 +66,10 @@ const scopeKeyframesPostCSSPlugin = postcssPlugin(
  * Assign style global directive and parsed styles to Marpit instance's
  * `lastStyles' property.
  *
- * @alias module:markdown/style/assign
+ * @function assign
  * @param {MarkdownIt} md markdown-it instance.
  */
-function assign(md) {
+function _assign(md) {
   const { marpit } = md
 
   md.core.ruler.after('marpit_slide', 'marpit_style_assign', (state) => {
@@ -152,4 +152,5 @@ function assign(md) {
   })
 }
 
-export default marpitPlugin(assign)
+export const assign = marpitPlugin(_assign)
+export default assign
diff --git a/src/markdown/style/parse.js b/src/markdown/style/parse.js
index 66165c41..b9319d4c 100644
--- a/src/markdown/style/parse.js
+++ b/src/markdown/style/parse.js
@@ -15,10 +15,10 @@ const styleMatcherScoped = /\bscoped\b/i
  * `<style>` elements will strip regardless of html setting provided by
  * markdown-it.
  *
- * @alias module:markdown/style/parse
+ * @function parse
  * @param {MarkdownIt} md markdown-it instance.
  */
-function parse(md) {
+function _parse(md) {
   /**
    * Based on markdown-it html_block rule
    * https://github.com/markdown-it/markdown-it/blob/master/lib/rules_block/html_block.js
@@ -76,4 +76,5 @@ function parse(md) {
   )
 }
 
-export default marpitPlugin(parse)
+export const parse = marpitPlugin(_parse)
+export default parse
diff --git a/src/markdown/sweep.js b/src/markdown/sweep.js
index 7d4292c1..7a50bf71 100644
--- a/src/markdown/sweep.js
+++ b/src/markdown/sweep.js
@@ -11,10 +11,10 @@ import marpitPlugin from '../plugin'
  * It also sweep the inline token marked as hidden forcely. Please notice that
  * plugins executed after this cannot handle hidden inline tokens.
  *
- * @alias module:markdown/sweep
+ * @function sweep
  * @param {MarkdownIt} md markdown-it instance.
  */
-function sweep(md) {
+function _sweep(md) {
   md.core.ruler.after('inline', 'marpit_sweep', (state) => {
     if (state.inlineMode) return
 
@@ -57,4 +57,5 @@ function sweep(md) {
   })
 }
 
-export default marpitPlugin(sweep)
+export const sweep = marpitPlugin(_sweep)
+export default sweep
diff --git a/src/marpit.js b/src/marpit.js
index 0ab323da..d967b988 100644
--- a/src/marpit.js
+++ b/src/marpit.js
@@ -1,6 +1,6 @@
 import MarkdownIt from 'markdown-it'
 import { marpitContainer } from './element'
-import wrapArray from './helpers/wrap_array'
+import { wrapArray } from './helpers/wrap_array'
 import marpitBackgroundImage from './markdown/background_image'
 import marpitCollect from './markdown/collect'
 import marpitComment from './markdown/comment'
diff --git a/src/plugin.js b/src/plugin.js
index 2f5a9c73..7f206dfb 100644
--- a/src/plugin.js
+++ b/src/plugin.js
@@ -6,7 +6,24 @@
  * Generate Marpit plugin from passed markdown-it plugin. Marpit plugin needs
  * markdown-it instance with `marpit` member.
  *
- * @alias module:plugin
+ * @example
+ * import { marpitPlugin } from '@marp-team/marpit/plugin'
+ *
+ * export default yourPlugin = marpitPlugin((md) => {
+ *   // Compatible with markdown-it plugin
+ *   md.renderer.rules.your_rule = (tokens, idx, options, env, self) => {
+ *     // ...
+ *   }
+ *
+ *   // And accessible to Marpit instance as `md.marpit`
+ *   const { marpit } = md
+ *
+ *   marpit.customDirectives.local.yourDirective = (value) => {
+ *     return { yourDirective: value }
+ *   }
+ * )}
+ *
+ * @function marpitPlugin
  * @param {Function} plugin Base plugin for markdown-it.
  * @returns {Function} Generated Marpit plugin.
  */
diff --git a/src/postcss/advanced_background.js b/src/postcss/advanced_background.js
index 080eb6ac..60d23131 100644
--- a/src/postcss/advanced_background.js
+++ b/src/postcss/advanced_background.js
@@ -6,9 +6,9 @@ import postcssPlugin from '../helpers/postcss_plugin'
  *
  * Append style to suport the advanced background.
  *
- * @alias module:postcss/advanced_background
+ * @function advancedBackground
  */
-const plugin = postcssPlugin(
+export const advancedBackground = postcssPlugin(
   'marpit-postcss-advanced-background',
   () => (css) => {
     css.last.after(
@@ -75,4 +75,4 @@ section[data-marpit-advanced-background-split] {
   }
 )
 
-export default plugin
+export default advancedBackground
diff --git a/src/postcss/import/parse.js b/src/postcss/import/parse.js
index 9c15410d..5be4555b 100644
--- a/src/postcss/import/parse.js
+++ b/src/postcss/import/parse.js
@@ -24,9 +24,9 @@ import postcssPlugin from '../../helpers/postcss_plugin'
  * can place `@import-theme` rule at any in the CSS root, and the content of
  * imported theme will always append to the beginning of CSS.
  *
- * @alias module:postcss/import/parse
+ * @function importParse
  */
-const plugin = postcssPlugin(
+export const importParse = postcssPlugin(
   'marpit-postcss-import-parse',
   () =>
     (css, { result }) => {
@@ -75,4 +75,4 @@ const plugin = postcssPlugin(
     }
 )
 
-export default plugin
+export default importParse
diff --git a/src/postcss/import/replace.js b/src/postcss/import/replace.js
index bca57c10..3984388b 100644
--- a/src/postcss/import/replace.js
+++ b/src/postcss/import/replace.js
@@ -10,10 +10,10 @@ import postcssImportParse from './parse'
  * Please see {@link module:postcss/import/parse} about the specification of
  * each syntax.
  *
- * @alias module:postcss/import/replace
+ * @function importReplace
  * @param {ThemeSet} themeSet ThemeSet instance.
  */
-const plugin = (themeSet, importedThemes = []) =>
+export const importReplace = (themeSet, importedThemes = []) =>
   postcssPlugin('marpit-postcss-import-replace', () => ({
     plugins: [
       postcssImportParse(),
@@ -36,7 +36,7 @@ const plugin = (themeSet, importedThemes = []) =>
                     )
 
                   const processed = postcss([
-                    plugin(themeSet, [...importedThemes, name]),
+                    importReplace(themeSet, [...importedThemes, name]),
                   ]).process(theme.css)
 
                   if (node.name === 'import') {
@@ -55,4 +55,4 @@ const plugin = (themeSet, importedThemes = []) =>
     ],
   }))
 
-export default plugin
+export default importReplace
diff --git a/src/postcss/import/rollup.js b/src/postcss/import/rollup.js
index acd2e336..571bb58b 100644
--- a/src/postcss/import/rollup.js
+++ b/src/postcss/import/rollup.js
@@ -10,35 +10,38 @@ import postcssPlugin from '../../helpers/postcss_plugin'
  *
  * This plugin takes care of rolling up invalid at-rules.
  *
- * @alias module:postcss/import/rollup
+ * @function importRollup
  */
-const plugin = postcssPlugin('marpit-postcss-import-rollup', () => (css) => {
-  const rolluped = {
-    charset: undefined,
-    imports: [],
-  }
-
-  css.walkAtRules((rule) => {
-    if (rule.name === 'charset') {
-      rule.remove()
-      if (!rolluped.charset) rolluped.charset = rule
-    } else if (rule.name === 'import') {
-      rolluped.imports.push(rule.remove())
+export const importRollup = postcssPlugin(
+  'marpit-postcss-import-rollup',
+  () => (css) => {
+    const rolluped = {
+      charset: undefined,
+      imports: [],
     }
-  })
 
-  const { first } = css
+    css.walkAtRules((rule) => {
+      if (rule.name === 'charset') {
+        rule.remove()
+        if (!rolluped.charset) rolluped.charset = rule
+      } else if (rule.name === 'import') {
+        rolluped.imports.push(rule.remove())
+      }
+    })
+
+    const { first } = css
 
-  // Rollup at-rules
-  ;[rolluped.charset, ...rolluped.imports]
-    .filter((r) => r)
-    .forEach((rule, idx) => {
-      // Strip whitespace from the beginning of first at-rule
-      const prependRule =
-        idx === 0 ? rule.clone({ raws: { before: undefined } }) : rule
+    // Rollup at-rules
+    ;[rolluped.charset, ...rolluped.imports]
+      .filter((r) => r)
+      .forEach((rule, idx) => {
+        // Strip whitespace from the beginning of first at-rule
+        const prependRule =
+          idx === 0 ? rule.clone({ raws: { before: undefined } }) : rule
 
-      first.before(prependRule)
-    })
-})
+        first.before(prependRule)
+      })
+  }
+)
 
-export default plugin
+export default importRollup
diff --git a/src/postcss/import/suppress.js b/src/postcss/import/suppress.js
index 5f03b1d8..1f3be7a4 100644
--- a/src/postcss/import/suppress.js
+++ b/src/postcss/import/suppress.js
@@ -10,19 +10,22 @@ import postcssImportParse from './parse'
  * This plugin is useful to prevent the inline style's rolled-up theme import by
  * unexpected order.
  *
- * @alias module:postcss/import/suppress
+ * @function importSuppress
  * @param {ThemeSet} themeSet ThemeSet instance.
  */
-const plugin = postcssPlugin('marpit-postcss-import-suppress', (themeSet) => ({
-  plugins: [
-    postcssImportParse(),
-    postcssPlugin('marpit-postcss-import-suppress', () => (css) => {
-      css.walk((node) => {
-        if (node.marpitImportParse && themeSet.has(node.marpitImportParse))
-          node.replaceWith(`${node.raw('before')}/* ${node.toString()}; */`)
-      })
-    })(),
-  ],
-}))
+export const importSuppress = postcssPlugin(
+  'marpit-postcss-import-suppress',
+  (themeSet) => ({
+    plugins: [
+      postcssImportParse(),
+      postcssPlugin('marpit-postcss-import-suppress', () => (css) => {
+        css.walk((node) => {
+          if (node.marpitImportParse && themeSet.has(node.marpitImportParse))
+            node.replaceWith(`${node.raw('before')}/* ${node.toString()}; */`)
+        })
+      })(),
+    ],
+  })
+)
 
-export default plugin
+export default importSuppress
diff --git a/src/postcss/meta.js b/src/postcss/meta.js
index 44bed7a0..9d6b41d0 100644
--- a/src/postcss/meta.js
+++ b/src/postcss/meta.js
@@ -6,11 +6,11 @@ import postcssPlugin from '../helpers/postcss_plugin'
  *
  * Parse CSS comment written in the format of `@key value`.
  *
+ * @function meta
  * @param {Object} [opts]
  * @param {Object} [opts.metaType] An object for defined types for metadata.
- * @alias module:postcss/meta
  */
-const plugin = postcssPlugin(
+export const meta = postcssPlugin(
   'marpit-postcss-meta',
   (opts = {}) =>
     (css, { result }) => {
@@ -37,4 +37,4 @@ const plugin = postcssPlugin(
     }
 )
 
-export default plugin
+export default meta
diff --git a/src/postcss/pagination.js b/src/postcss/pagination.js
index 8e87c9ec..060e8366 100644
--- a/src/postcss/pagination.js
+++ b/src/postcss/pagination.js
@@ -11,22 +11,25 @@ import postcssPlugin from '../helpers/postcss_plugin'
  * `section::after` of the root, to prevent override the defined attribute for
  * paginating.
  *
- * @alias module:postcss/pagination
+ * @function pagination
  */
-const plugin = postcssPlugin('marpit-postcss-pagination', () => (css) => {
-  css.walkRules((rule) => {
-    if (
-      rule.selectors.some((selector) =>
-        /^section(?![\w-])[^\s>+~]*::?after$/.test(
-          selector.replace(/\[.*?\]/g, '')
+export const pagination = postcssPlugin(
+  'marpit-postcss-pagination',
+  () => (css) => {
+    css.walkRules((rule) => {
+      if (
+        rule.selectors.some((selector) =>
+          /^section(?![\w-])[^\s>+~]*::?after$/.test(
+            selector.replace(/\[.*?\]/g, '')
+          )
         )
       )
-    )
-      rule.walkDecls('content', (decl) => {
-        if (!decl.value.includes('attr(data-marpit-pagination)'))
-          decl.replaceWith(`${decl.raw('before')}/* ${decl.toString()}; */`)
-      })
-  })
-})
+        rule.walkDecls('content', (decl) => {
+          if (!decl.value.includes('attr(data-marpit-pagination)'))
+            decl.replaceWith(`${decl.raw('before')}/* ${decl.toString()}; */`)
+        })
+    })
+  }
+)
 
-export default plugin
+export default pagination
diff --git a/src/postcss/printable.js b/src/postcss/printable.js
index 37458753..dd70a4d2 100644
--- a/src/postcss/printable.js
+++ b/src/postcss/printable.js
@@ -18,15 +18,17 @@ html, body {
  * @param {Object} opts
  * @param {string} opts.width
  * @param {string} opts.height
- * @alias module:postcss/printable
+ * @function printable
  */
-const plugin = postcssPlugin('marpit-postcss-printable', (opts) => (css) => {
-  css.walkAtRules('media', (rule) => {
-    if (rule.params === 'marpit-print') rule.remove()
-  })
+export const printable = postcssPlugin(
+  'marpit-postcss-printable',
+  (opts) => (css) => {
+    css.walkAtRules('media', (rule) => {
+      if (rule.params === 'marpit-print') rule.remove()
+    })
 
-  css.first.before(
-    `
+    css.first.before(
+      `
 @page {
   size: ${opts.width} ${opts.height};
   margin: 0;
@@ -53,13 +55,14 @@ const plugin = postcssPlugin('marpit-postcss-printable', (opts) => (css) => {
   }
 }
 `.trim()
-  )
-})
+    )
+  }
+)
 
 /**
  * The post-process PostCSS plugin of Marpit printable plugin.
  *
- * @alias module:postcss/printable.postprocess
+ * @function postprocess
  */
 export const postprocess = postcssPlugin(
   'marpit-postcss-printable-postprocess',
@@ -72,4 +75,4 @@ export const postprocess = postcssPlugin(
     })
 )
 
-export default plugin
+export default printable
diff --git a/src/postcss/pseudo_selector/prepend.js b/src/postcss/pseudo_selector/prepend.js
index 96b012e2..b82850e8 100644
--- a/src/postcss/pseudo_selector/prepend.js
+++ b/src/postcss/pseudo_selector/prepend.js
@@ -7,9 +7,9 @@ import postcssPlugin from '../../helpers/postcss_plugin'
  * Prepend `:marpit-container > :marpit-slide` pseudo selector to each selector
  * of Marpit theme CSS for modulized styling.
  *
- * @alias module:postcss/pseudo_selector/prepend
+ * @function pseudoSelectorPrepend
  */
-const plugin = postcssPlugin(
+export const pseudoSelectorPrepend = postcssPlugin(
   'marpit-postcss-pseudo-selector-prepend',
   () => (css) =>
     css.walkRules((rule) => {
@@ -27,4 +27,4 @@ const plugin = postcssPlugin(
     })
 )
 
-export default plugin
+export default pseudoSelectorPrepend
diff --git a/src/postcss/pseudo_selector/replace.js b/src/postcss/pseudo_selector/replace.js
index 66e83443..c88bc802 100644
--- a/src/postcss/pseudo_selector/replace.js
+++ b/src/postcss/pseudo_selector/replace.js
@@ -1,7 +1,7 @@
 /** @module */
 import cssesc from 'cssesc'
 import postcssPlugin from '../../helpers/postcss_plugin'
-import wrapArray from '../../helpers/wrap_array'
+import { wrapArray } from '../../helpers/wrap_array'
 
 const buildSelector = (elms) =>
   elms
@@ -24,11 +24,11 @@ const buildSelector = (elms) =>
  * Replace `:marpit-container` and `:marpit-slide` pseudo selector into
  * container element(s).
  *
- * @alias module:postcss/pseudo_selector/replace
+ * @function pseudoSelectorReplace
  * @param {Element|Element[]} [elements] Container elements
  * @param {Element|Element[]} [slideElements={ tag: 'section' }] Slide elements
  */
-const plugin = postcssPlugin(
+export const pseudoSelectorReplace = postcssPlugin(
   'marpit-postcss-pseudo-selector-replace',
   (elements, slideElements = { tag: 'section' }) => {
     const container = buildSelector([...wrapArray(elements)])
@@ -46,4 +46,4 @@ const plugin = postcssPlugin(
   }
 )
 
-export default plugin
+export default pseudoSelectorReplace
diff --git a/src/postcss/root/font_size.js b/src/postcss/root/font_size.js
index 39e3acfa..76b80a27 100644
--- a/src/postcss/root/font_size.js
+++ b/src/postcss/root/font_size.js
@@ -9,9 +9,9 @@ export const rootFontSizeCustomProp = '--marpit-root-font-size'
  * Inject CSS variable based on the root slide container `section` for correct
  * calculation of `rem` unit in the context of Marpit.
  *
- * @alias module:postcss/root/font_size
+ * @function rootFontSize
  */
-const plugin = postcssPlugin(
+export const rootFontSize = postcssPlugin(
   'marpit-postcss-root-font-size',
   () => (css, postcss) =>
     css.walkRules((rule) => {
@@ -57,4 +57,4 @@ const plugin = postcssPlugin(
     })
 )
 
-export default plugin
+export default rootFontSize
diff --git a/src/postcss/root/increasing_specificity.js b/src/postcss/root/increasing_specificity.js
index 35265cf9..f48ef4d9 100644
--- a/src/postcss/root/increasing_specificity.js
+++ b/src/postcss/root/increasing_specificity.js
@@ -13,9 +13,9 @@ const matcher = new RegExp(`\\b(?:section)?${pseudoClass}\\b`, 'g')
  * by root replace plugin so `:where(section):not([\20 root])` must always match
  * too (HTML does not allow U+0020 SPACE in the attribute name.).
  *
- * @alias module:postcss/root/increasing_specificity
+ * @function rootIncreasingSpecificity
  */
-const plugin = postcssPlugin(
+export const rootIncreasingSpecificity = postcssPlugin(
   'marpit-postcss-root-increasing-specificity',
   () => (css) =>
     css.walkRules((rule) => {
@@ -25,4 +25,4 @@ const plugin = postcssPlugin(
     })
 )
 
-export default plugin
+export default rootIncreasingSpecificity
diff --git a/src/postcss/root/rem.js b/src/postcss/root/rem.js
index 60a8b0b4..293f66b4 100644
--- a/src/postcss/root/rem.js
+++ b/src/postcss/root/rem.js
@@ -9,9 +9,9 @@ const skipParsingMatcher = /("[^"]*"|'[^']*'|(?:attr|url|var)\([^)]*\))/g
  *
  * Replace `rem` unit to calculated value from CSS variable.
  *
- * @alias module:postcss/root/rem
+ * @function rem
  */
-const plugin = postcssPlugin(
+export const rem = postcssPlugin(
   'marpit-postcss-rem',
   () => (css) =>
     css.walkDecls((decl) => {
@@ -29,4 +29,4 @@ const plugin = postcssPlugin(
     })
 )
 
-export default plugin
+export default rem
diff --git a/src/postcss/root/replace.js b/src/postcss/root/replace.js
index 2f2283cc..2e67c530 100644
--- a/src/postcss/root/replace.js
+++ b/src/postcss/root/replace.js
@@ -8,9 +8,9 @@ import postcssPlugin from '../../helpers/postcss_plugin'
  * pseudo class through `pseudoClass` option to make distinguishable from
  * `section` selector.
  *
- * @alias module:postcss/root/replace
+ * @function rootReplace
  */
-const plugin = postcssPlugin(
+export const rootReplace = postcssPlugin(
   'marpit-postcss-root-replace',
   ({ pseudoClass } = {}) =>
     (css) =>
@@ -25,4 +25,4 @@ const plugin = postcssPlugin(
       })
 )
 
-export default plugin
+export default rootReplace
diff --git a/src/postcss/section_size.js b/src/postcss/section_size.js
index ec83e5b7..145fa436 100644
--- a/src/postcss/section_size.js
+++ b/src/postcss/section_size.js
@@ -6,9 +6,9 @@ import postcssPlugin from '../helpers/postcss_plugin'
  *
  * Parse width and height declartaion on `section` selector.
  *
- * @alias module:postcss/section_size
+ * @function sectionSize
  */
-const plugin = postcssPlugin(
+export const sectionSize = postcssPlugin(
   'marpit-postcss-section-size',
   ({ preferedPseudoClass } = {}) => {
     const rootSectionMatcher = new RegExp(
@@ -56,4 +56,4 @@ const plugin = postcssPlugin(
   }
 )
 
-export default plugin
+export default sectionSize
diff --git a/src/postcss/svg_backdrop.js b/src/postcss/svg_backdrop.js
index 9f3f86e6..cc3aa24e 100644
--- a/src/postcss/svg_backdrop.js
+++ b/src/postcss/svg_backdrop.js
@@ -35,9 +35,9 @@ const backdropMatcher = /(?:\b|^)::backdrop$/
  * disable the selector support by `inlineSVG: { backdropSelector: false }`.
  *
  * @see https://developer.mozilla.org/docs/Web/CSS/::backdrop
- * @alias module:postcss/svg_backdrop
+ * @function svgBackdrop
  */
-const plugin = postcssPlugin(
+export const svgBackdrop = postcssPlugin(
   'marpit-postcss-svg-backdrop',
   () => (css, postcss) => {
     css.walkRules((rule) => {
@@ -78,4 +78,4 @@ const plugin = postcssPlugin(
   }
 )
 
-export default plugin
+export default svgBackdrop
diff --git a/src/theme/scaffold.js b/src/theme/scaffold.js
index 01199225..239ad369 100644
--- a/src/theme/scaffold.js
+++ b/src/theme/scaffold.js
@@ -46,9 +46,10 @@ video::-webkit-media-controls {
  * - Normalize `<h1>` heading style.
  * - Apply workaround for glitched video control on Chromium (https://github.com/marp-team/marpit/issues/205)
  *
- * @alias module:theme/scaffold
  * @type {Theme}
  */
-const scaffoldTheme = Theme.fromCSS(css, { [skipThemeValidationSymbol]: true })
+export const scaffoldTheme = Theme.fromCSS(css, {
+  [skipThemeValidationSymbol]: true,
+})
 
 export default scaffoldTheme
diff --git a/src/theme_set.js b/src/theme_set.js
index a207c869..2a0e2c79 100644
--- a/src/theme_set.js
+++ b/src/theme_set.js
@@ -226,8 +226,8 @@ class ThemeSet {
    * Convert registered theme CSS into usable in the rendered markdown by
    * {@link Marpit#render}.
    *
-   * You should use {@link Marpit#render} unless there is some particular
-   * reason.
+   * **This method is designed for internal use by {@link Marpit} class.** Use
+   * {@link Marpit#render} instead unless there is some particular reason.
    *
    * @param {string} name The theme name. It will use the instance's default
    *     theme or scaffold theme when a specific named theme does not exist.
diff --git a/test/markdown/background_image.js b/test/markdown/background_image.js
index 7f943d73..ec46a63c 100644
--- a/test/markdown/background_image.js
+++ b/test/markdown/background_image.js
@@ -1,12 +1,12 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
-import backgroundImage from '../../src/markdown/background_image'
-import comment from '../../src/markdown/comment'
+import { backgroundImage } from '../../src/markdown/background_image'
+import { comment } from '../../src/markdown/comment'
 import applyDirectives from '../../src/markdown/directives/apply'
 import parseDirectives from '../../src/markdown/directives/parse'
-import image from '../../src/markdown/image'
-import inlineSVG from '../../src/markdown/inline_svg'
-import slide from '../../src/markdown/slide'
+import { image } from '../../src/markdown/image'
+import { inlineSVG } from '../../src/markdown/inline_svg'
+import { slide } from '../../src/markdown/slide'
 import assignStyle from '../../src/markdown/style/assign'
 import parseStyle from '../../src/markdown/style/parse'
 
diff --git a/test/markdown/collect.js b/test/markdown/collect.js
index 73553fd1..24cae027 100644
--- a/test/markdown/collect.js
+++ b/test/markdown/collect.js
@@ -1,12 +1,12 @@
 import dedent from 'dedent'
 import MarkdownIt from 'markdown-it'
 import { ThemeSet } from '../../src/index'
-import collect from '../../src/markdown/collect'
-import comment, { markAsParsed } from '../../src/markdown/comment'
+import { collect } from '../../src/markdown/collect'
+import { comment, markAsParsed } from '../../src/markdown/comment'
 import applyDirectives from '../../src/markdown/directives/apply'
 import parseDirectives from '../../src/markdown/directives/parse'
-import inlineSVG from '../../src/markdown/inline_svg'
-import slide from '../../src/markdown/slide'
+import { inlineSVG } from '../../src/markdown/inline_svg'
+import { slide } from '../../src/markdown/slide'
 
 describe('Marpit collect plugin', () => {
   const themeSet = new ThemeSet()
diff --git a/test/markdown/comment.js b/test/markdown/comment.js
index 814b56b6..8ce04fd7 100644
--- a/test/markdown/comment.js
+++ b/test/markdown/comment.js
@@ -1,7 +1,7 @@
 import { load } from 'cheerio'
 import dedent from 'dedent'
 import MarkdownIt from 'markdown-it'
-import comment from '../../src/markdown/comment'
+import { comment } from '../../src/markdown/comment'
 
 describe('Marpit comment plugin', () => {
   const md = (mdOption = {}) => {
diff --git a/test/markdown/container.js b/test/markdown/container.js
index 3e31bc27..65bf6653 100644
--- a/test/markdown/container.js
+++ b/test/markdown/container.js
@@ -1,7 +1,7 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
 import { Element } from '../../src/index'
-import container from '../../src/markdown/container'
+import { container } from '../../src/markdown/container'
 
 describe('Marpit container plugin', () => {
   const md = (containers) => {
diff --git a/test/markdown/directives/apply.js b/test/markdown/directives/apply.js
index 65c87b96..efaa305a 100644
--- a/test/markdown/directives/apply.js
+++ b/test/markdown/directives/apply.js
@@ -1,10 +1,10 @@
 import { load } from 'cheerio'
 import dedent from 'dedent'
 import MarkdownIt from 'markdown-it'
-import comment from '../../../src/markdown/comment'
+import { comment } from '../../../src/markdown/comment'
 import applyDirectives from '../../../src/markdown/directives/apply'
 import parseDirectives from '../../../src/markdown/directives/parse'
-import slide from '../../../src/markdown/slide'
+import { slide } from '../../../src/markdown/slide'
 
 describe('Marpit directives apply plugin', () => {
   const themeSetStub = new Map()
diff --git a/test/markdown/directives/parse.js b/test/markdown/directives/parse.js
index 3f07ac53..46b42ad3 100644
--- a/test/markdown/directives/parse.js
+++ b/test/markdown/directives/parse.js
@@ -1,8 +1,8 @@
 import dedent from 'dedent'
 import MarkdownIt from 'markdown-it'
-import comment from '../../../src/markdown/comment'
+import { comment } from '../../../src/markdown/comment'
 import parseDirectives from '../../../src/markdown/directives/parse'
-import slide from '../../../src/markdown/slide'
+import { slide } from '../../../src/markdown/slide'
 
 describe('Marpit directives parse plugin', () => {
   const themeSetStub = new Map()
diff --git a/test/markdown/directives/yaml.js b/test/markdown/directives/yaml.js
index a1ba252e..a5ee13d2 100644
--- a/test/markdown/directives/yaml.js
+++ b/test/markdown/directives/yaml.js
@@ -1,5 +1,5 @@
 import dedent from 'dedent'
-import yaml from '../../../src/markdown/directives/yaml'
+import { yaml } from '../../../src/markdown/directives/yaml'
 
 describe('Marpit directives YAML parser', () => {
   it("ignores directive's special char with false looseDirectives option", () =>
diff --git a/test/markdown/fragment.js b/test/markdown/fragment.js
index 25ff3be7..b03340d1 100644
--- a/test/markdown/fragment.js
+++ b/test/markdown/fragment.js
@@ -1,7 +1,7 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
-import fragment from '../../src/markdown/fragment'
-import slide from '../../src/markdown/slide'
+import { fragment } from '../../src/markdown/fragment'
+import { slide } from '../../src/markdown/slide'
 
 describe('Marpit fragment plugin', () => {
   const md = () => {
diff --git a/test/markdown/header_and_footer.js b/test/markdown/header_and_footer.js
index 7c8e994a..80b06806 100644
--- a/test/markdown/header_and_footer.js
+++ b/test/markdown/header_and_footer.js
@@ -1,10 +1,10 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
-import comment from '../../src/markdown/comment'
+import { comment } from '../../src/markdown/comment'
 import applyDirectives from '../../src/markdown/directives/apply'
 import parseDirectives from '../../src/markdown/directives/parse'
-import headerAndFooter from '../../src/markdown/header_and_footer'
-import slide from '../../src/markdown/slide'
+import { headerAndFooter } from '../../src/markdown/header_and_footer'
+import { slide } from '../../src/markdown/slide'
 
 describe('Marpit header and footer plugin', () => {
   const themeSet = new Map()
diff --git a/test/markdown/heading_divider.js b/test/markdown/heading_divider.js
index c294c16a..96b87854 100644
--- a/test/markdown/heading_divider.js
+++ b/test/markdown/heading_divider.js
@@ -1,9 +1,9 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
-import comment from '../../src/markdown/comment'
+import { comment } from '../../src/markdown/comment'
 import parseDirectives from '../../src/markdown/directives/parse'
-import headingDivider from '../../src/markdown/heading_divider'
-import slide from '../../src/markdown/slide'
+import { headingDivider } from '../../src/markdown/heading_divider'
+import { slide } from '../../src/markdown/slide'
 
 describe('Marpit heading divider plugin', () => {
   const marpitStub = (headingDividerOption) => ({
diff --git a/test/markdown/image.js b/test/markdown/image.js
index bd01b971..c5d1159a 100644
--- a/test/markdown/image.js
+++ b/test/markdown/image.js
@@ -1,13 +1,13 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
-import backgroundImage from '../../src/markdown/background_image'
-import comment from '../../src/markdown/comment'
+import { backgroundImage } from '../../src/markdown/background_image'
+import { comment } from '../../src/markdown/comment'
 import applyDirectives from '../../src/markdown/directives/apply'
 import parseDirectives from '../../src/markdown/directives/parse'
-import headerAndFooter from '../../src/markdown/header_and_footer'
-import image from '../../src/markdown/image'
-import inlineSVG from '../../src/markdown/inline_svg'
-import slide from '../../src/markdown/slide'
+import { headerAndFooter } from '../../src/markdown/header_and_footer'
+import { image } from '../../src/markdown/image'
+import { inlineSVG } from '../../src/markdown/inline_svg'
+import { slide } from '../../src/markdown/slide'
 
 describe('Marpit image plugin', () => {
   const md = (svg = false) =>
diff --git a/test/markdown/inline_svg.js b/test/markdown/inline_svg.js
index 3aafc0a9..a9351251 100644
--- a/test/markdown/inline_svg.js
+++ b/test/markdown/inline_svg.js
@@ -1,8 +1,8 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
 import { Theme, ThemeSet } from '../../src/index'
-import inlineSVG from '../../src/markdown/inline_svg'
-import slide from '../../src/markdown/slide'
+import { inlineSVG } from '../../src/markdown/inline_svg'
+import { slide } from '../../src/markdown/slide'
 import skipThemeValidationSymbol from '../../src/theme/symbol'
 
 describe('Marpit inline SVG plugin', () => {
diff --git a/test/markdown/slide.js b/test/markdown/slide.js
index 7febe8c6..c4958bfc 100644
--- a/test/markdown/slide.js
+++ b/test/markdown/slide.js
@@ -1,6 +1,6 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
-import slide from '../../src/markdown/slide'
+import { slide } from '../../src/markdown/slide'
 
 describe('Marpit slide plugin', () => {
   const md = (...args) => {
diff --git a/test/markdown/slide_container.js b/test/markdown/slide_container.js
index 93c14199..ed2facd2 100644
--- a/test/markdown/slide_container.js
+++ b/test/markdown/slide_container.js
@@ -1,8 +1,8 @@
 import { load } from 'cheerio'
 import MarkdownIt from 'markdown-it'
 import { Element } from '../../src/index'
-import slide from '../../src/markdown/slide'
-import slideContainer from '../../src/markdown/slide_container'
+import { slide } from '../../src/markdown/slide'
+import { slideContainer } from '../../src/markdown/slide_container'
 
 describe('Marpit slide container plugin', () => {
   const md = (containers) => {
diff --git a/test/markdown/style/assign.js b/test/markdown/style/assign.js
index 161b9ced..f4ab651d 100644
--- a/test/markdown/style/assign.js
+++ b/test/markdown/style/assign.js
@@ -1,10 +1,10 @@
 import { load } from 'cheerio'
 import dedent from 'dedent'
 import MarkdownIt from 'markdown-it'
-import comment from '../../../src/markdown/comment'
+import { comment } from '../../../src/markdown/comment'
 import applyDirectives from '../../../src/markdown/directives/apply'
 import parseDirectives from '../../../src/markdown/directives/parse'
-import slide from '../../../src/markdown/slide'
+import { slide } from '../../../src/markdown/slide'
 import styleAssign from '../../../src/markdown/style/assign'
 import styleParse from '../../../src/markdown/style/parse'
 
diff --git a/test/markdown/sweep.js b/test/markdown/sweep.js
index ab421f84..515ad905 100644
--- a/test/markdown/sweep.js
+++ b/test/markdown/sweep.js
@@ -1,14 +1,14 @@
 import { load } from 'cheerio'
 import dedent from 'dedent'
 import MarkdownIt from 'markdown-it'
-import backgroundImage from '../../src/markdown/background_image'
-import comment from '../../src/markdown/comment'
+import { backgroundImage } from '../../src/markdown/background_image'
+import { comment } from '../../src/markdown/comment'
 import applyDirectives from '../../src/markdown/directives/apply'
 import parseDirectives from '../../src/markdown/directives/parse'
-import image from '../../src/markdown/image'
-import inlineSVG from '../../src/markdown/inline_svg'
-import slide from '../../src/markdown/slide'
-import sweep from '../../src/markdown/sweep'
+import { image } from '../../src/markdown/image'
+import { inlineSVG } from '../../src/markdown/inline_svg'
+import { slide } from '../../src/markdown/slide'
+import { sweep } from '../../src/markdown/sweep'
 
 describe('Marpit sweep plugin', () => {
   const md = (mdOpts = {}, marpitInstance = { options: {} }) => {
diff --git a/test/postcss/advanced_background.js b/test/postcss/advanced_background.js
index 2bf13124..65bd9505 100644
--- a/test/postcss/advanced_background.js
+++ b/test/postcss/advanced_background.js
@@ -1,5 +1,5 @@
 import postcss from 'postcss'
-import advancedBackground from '../../src/postcss/advanced_background'
+import { advancedBackground } from '../../src/postcss/advanced_background'
 
 describe('Marpit PostCSS advanced background plugin', () => {
   const run = (input) =>
diff --git a/test/postcss/import/parse.js b/test/postcss/import/parse.js
index e45581f0..ce42bc0e 100644
--- a/test/postcss/import/parse.js
+++ b/test/postcss/import/parse.js
@@ -1,5 +1,5 @@
 import postcss from 'postcss'
-import importParse from '../../../src/postcss/import/parse'
+import { importParse } from '../../../src/postcss/import/parse'
 
 describe('Marpit PostCSS import parse plugin', () => {
   const run = (input) =>
diff --git a/test/postcss/import/replace.js b/test/postcss/import/replace.js
index aab8da74..e37e5a34 100644
--- a/test/postcss/import/replace.js
+++ b/test/postcss/import/replace.js
@@ -1,6 +1,6 @@
 import dedent from 'dedent'
 import postcss from 'postcss'
-import importReplace from '../../../src/postcss/import/replace'
+import { importReplace } from '../../../src/postcss/import/replace'
 
 describe('Marpit PostCSS import replace plugin', () => {
   const themeSetStub = new Map()
diff --git a/test/postcss/import/rollup.js b/test/postcss/import/rollup.js
index c903e412..6816944d 100644
--- a/test/postcss/import/rollup.js
+++ b/test/postcss/import/rollup.js
@@ -1,6 +1,6 @@
 import dedent from 'dedent'
 import postcss from 'postcss'
-import importRollup from '../../../src/postcss/import/rollup'
+import { importRollup } from '../../../src/postcss/import/rollup'
 
 describe('Marpit PostCSS import rollup plugin', () => {
   const run = (input) =>
diff --git a/test/postcss/import/suppress.js b/test/postcss/import/suppress.js
index e488bb51..5a3f793d 100644
--- a/test/postcss/import/suppress.js
+++ b/test/postcss/import/suppress.js
@@ -1,5 +1,5 @@
 import postcss from 'postcss'
-import importSuppress from '../../../src/postcss/import/suppress'
+import { importSuppress } from '../../../src/postcss/import/suppress'
 
 describe('Marpit PostCSS import suppress plugin', () => {
   const themeSetStub = new Map()
diff --git a/test/postcss/meta.js b/test/postcss/meta.js
index 49ff0437..3541c0e4 100644
--- a/test/postcss/meta.js
+++ b/test/postcss/meta.js
@@ -1,5 +1,5 @@
 import postcss from 'postcss'
-import meta from '../../src/postcss/meta'
+import { meta } from '../../src/postcss/meta'
 
 describe('Marpit PostCSS meta plugin', () => {
   const run = (input) => postcss([meta()]).process(input, { from: undefined })
diff --git a/test/postcss/pagination.js b/test/postcss/pagination.js
index 9d96e7a6..16d2ec2f 100644
--- a/test/postcss/pagination.js
+++ b/test/postcss/pagination.js
@@ -1,5 +1,5 @@
 import postcss from 'postcss'
-import pagination from '../../src/postcss/pagination'
+import { pagination } from '../../src/postcss/pagination'
 
 describe('Marpit PostCSS pagination plugin', () => {
   const run = (input) =>
diff --git a/test/postcss/printable.js b/test/postcss/printable.js
index 0618504c..7cceca4c 100644
--- a/test/postcss/printable.js
+++ b/test/postcss/printable.js
@@ -1,6 +1,6 @@
 import dedent from 'dedent'
 import postcss from 'postcss'
-import printable, { postprocess } from '../../src/postcss/printable'
+import { printable, postprocess } from '../../src/postcss/printable'
 import { findAtRule, findDecl, findRule } from '../_supports/postcss_finder'
 
 describe('Marpit PostCSS printable plugin', () => {
diff --git a/test/postcss/root/rem.js b/test/postcss/root/rem.js
index 254b9808..cc1def3f 100644
--- a/test/postcss/root/rem.js
+++ b/test/postcss/root/rem.js
@@ -1,7 +1,7 @@
 import dedent from 'dedent'
 import postcss from 'postcss'
 import { rootFontSizeCustomProp } from '../../../src/postcss/root/font_size'
-import rem from '../../../src/postcss/root/rem'
+import { rem } from '../../../src/postcss/root/rem'
 
 describe('Marpit PostCSS rem plugin', () => {
   const run = (input) => postcss([rem()]).process(input, { from: undefined })
diff --git a/test/postcss/section_size.js b/test/postcss/section_size.js
index a5bb1192..97053ac5 100644
--- a/test/postcss/section_size.js
+++ b/test/postcss/section_size.js
@@ -1,5 +1,5 @@
 import postcss from 'postcss'
-import sectionSize from '../../src/postcss/section_size'
+import { sectionSize } from '../../src/postcss/section_size'
 
 describe('Marpit PostCSS section size plugin', () => {
   const run = (input) =>
diff --git a/test/postcss/svg_backdrop.js b/test/postcss/svg_backdrop.js
index fce57861..d0fd8eb1 100644
--- a/test/postcss/svg_backdrop.js
+++ b/test/postcss/svg_backdrop.js
@@ -1,5 +1,5 @@
 import postcss from 'postcss'
-import svgBackdrop from '../../src/postcss/svg_backdrop'
+import { svgBackdrop } from '../../src/postcss/svg_backdrop'
 
 describe('Marpit PostCSS SVG backdrop plugin', () => {
   const run = (input) =>
diff --git a/test/theme_set.js b/test/theme_set.js
index d0046306..ca1e3f1f 100644
--- a/test/theme_set.js
+++ b/test/theme_set.js
@@ -1,6 +1,6 @@
 import dedent from 'dedent'
 import { ThemeSet, Theme } from '../src/index'
-import scaffoldTheme from '../src/theme/scaffold'
+import { scaffoldTheme } from '../src/theme/scaffold'
 
 describe('ThemeSet', () => {
   let instance