diff --git a/packages/reveal-test/dist/reveal-test.cjs b/packages/reveal-test/dist/reveal-test.cjs
index 03d620e..5760a41 100644
--- a/packages/reveal-test/dist/reveal-test.cjs
+++ b/packages/reveal-test/dist/reveal-test.cjs
@@ -6,7 +6,7 @@ var compilerExplorerDirectives = require('compiler-explorer-directives');
 var MarkdownIt = require('markdown-it');
 var fs = require('fs');
 var cheerio = require('cheerio');
-var dedent = require('dedent');
+var dedent = require('dedent-js');
 
 function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
 
diff --git a/packages/reveal-test/dist/reveal-test.cjs.map b/packages/reveal-test/dist/reveal-test.cjs.map
index 0eedb6c..8401cd6 100644
--- a/packages/reveal-test/dist/reveal-test.cjs.map
+++ b/packages/reveal-test/dist/reveal-test.cjs.map
@@ -1 +1 @@
-{"version":3,"file":"reveal-test.cjs","sources":["../src/reveal-test.js"],"sourcesContent":["'use strict';\n\nimport { parseCode, compile as origCompile, CompileError } from 'compiler-explorer-directives';\nimport MarkdownIt from 'markdown-it';\nimport { promises } from 'fs';\nimport cheerio from 'cheerio';\nimport dedent from 'dedent';\n\nclass ParseError extends Error {\n  constructor(message) {\n    super(message);\n    this.name = 'ParseError';\n  }\n}\n\nconst elementLineNumber = (container, index) => {\n  // https://stackoverflow.com/a/14482123/621176\n  const nthIndex = (str, pat, n) => {\n    var L = str.length, i = -1;\n    while (n-- && i++ < L) {\n      i = str.indexOf(pat, i);\n      if (i < 0) break;\n    }\n    return i;\n  };\n\n  var upToElement = container.substr(0, nthIndex(container, \"<code\", index + 1));\n  return (upToElement.match(/\\n\\r?/g) || []).length;\n}\n\nconst parseMarkdown = async (markdown, config = {}) => {\n  const md = new MarkdownIt({ html: true, breaks: true });\n  const result = md.parse(markdown, {});\n  const codeBlocks = result\n    .filter(({ type, tag }) => type === 'fence' && tag === 'code')\n    .map(({ content, info, map }) => { return { content: content, language: info.replace(/(\\w+).*/, '$1'), line: map[0] + 1 }; })\n    .concat(result\n      .filter(({ type }) => type === 'html_block').flatMap(({ content, info, map }) => {\n        const $ = cheerio.load(content);\n        return $('pre code').map(function (index) {\n          return {\n            content: dedent($(this).text().replace(/(\\n)/g, '$1 ')),\n            language: $(this).attr(\"class\"),\n            line: map[0] + 1 + elementLineNumber(content, index)\n          };\n        }).toArray();\n      }))\n    .sort((a, b) => a.line - b.line);\n  return []\n    .concat\n    .apply([], await Promise.all(codeBlocks\n      .flatMap(async ({ content, language, line }) => {\n        content.replace(/<\\/?mark>/, '');\n        const error = message => new ParseError(`${line}:\\n${message}`);\n        config = Object.assign(config, {\n          directives: [\n            ['fails=(.*)', (matches, info) => matches.slice(1).forEach(match => {\n              if (info.hasOwnProperty('expectedOutput')) {\n                throw error('cannot have \"fails\" and \"output\" together');\n              }\n              info.failReason = match;\n            })],\n            ['output=(.*)', (matches, info) => matches.slice(1).forEach(match => {\n              if (info.hasOwnProperty('failReason')) {\n                throw error('cannot have \"fails\" and \"output\" together');\n              }\n              info.expectedOutput = matches[1].replace(/\\\\n/g, '\\n');\n            })]\n          ]\n        });\n        const parsed = await parseCode(content.replace(/<br\\/>/g, ''), language, config);\n        if (!parsed) {\n          return []\n        }\n        parsed.line = line;\n        return [parsed];\n      })));\n};\n\nconst parseMarkdownFile = async (path, config = {}) => {\n  try {\n    const markdown = await promises.readFile(path, 'utf-8');\n    const parsed = await parseMarkdown(markdown, config);\n    return parsed.map(codeInfo => {\n      codeInfo.path = `${path}:${codeInfo.line}`;\n      delete codeInfo.line;\n      return codeInfo;\n    });\n  } catch (err) {\n    if (err instanceof ParseError) {\n      throw new ParseError(`${path}:${err.message}`)\n    } else {\n      throw err;\n    }\n  }\n}\n\nconst compile = async (info, retryOptions = {}) => {\n  const error = (text) => {\n    return `${info.path}:\\n${text}`;\n  };\n  const failureMismatch = (output) => {\n    return new CompileError(-1, error(`should have failed with '${info.failReason}'${output.length > 0 ? `\\nactual output is:\\n${output}` : ''}`));\n  };\n  if (info.failReason) {\n    try {\n      const result = await origCompile(info, retryOptions);\n      throw failureMismatch(result);\n    } catch (err) {\n      if (!err.message.includes(info.failReason)) {\n        throw failureMismatch(err.message);\n      }\n      return err.message;\n    }\n  } else {\n    const result = await (async () => {\n      try {\n        return await origCompile(info, retryOptions);\n      } catch (err) {\n        const code = err.hasOwnProperty('code') ? err.code : -2;\n        throw new CompileError(err.code, error(err.message));\n      }\n    })();\n\n    if (info.hasOwnProperty('expectedOutput') && !result.includes(info.expectedOutput)) {\n      throw new CompileError(-3, error(`output mismatch:\\nactual: ${result}\\nexpected: ${info.expectedOutput}`));\n    }\n\n    return result;\n  }\n};\n\nexport { parseMarkdown, parseMarkdownFile, compile, CompileError 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+{"version":3,"file":"reveal-test.cjs","sources":["../src/reveal-test.js"],"sourcesContent":["'use strict';\n\nimport { parseCode, compile as origCompile, CompileError } from 'compiler-explorer-directives';\nimport MarkdownIt from 'markdown-it';\nimport { promises } from 'fs';\nimport cheerio from 'cheerio';\nimport dedent from 'dedent-js';\n\nclass ParseError extends Error {\n  constructor(message) {\n    super(message);\n    this.name = 'ParseError';\n  }\n}\n\nconst elementLineNumber = (container, index) => {\n  // https://stackoverflow.com/a/14482123/621176\n  const nthIndex = (str, pat, n) => {\n    var L = str.length, i = -1;\n    while (n-- && i++ < L) {\n      i = str.indexOf(pat, i);\n      if (i < 0) break;\n    }\n    return i;\n  };\n\n  var upToElement = container.substr(0, nthIndex(container, \"<code\", index + 1));\n  return (upToElement.match(/\\n\\r?/g) || []).length;\n}\n\nconst parseMarkdown = async (markdown, config = {}) => {\n  const md = new MarkdownIt({ html: true, breaks: true });\n  const result = md.parse(markdown, {});\n  const codeBlocks = result\n    .filter(({ type, tag }) => type === 'fence' && tag === 'code')\n    .map(({ content, info, map }) => { return { content: content, language: info.replace(/(\\w+).*/, '$1'), line: map[0] + 1 }; })\n    .concat(result\n      .filter(({ type }) => type === 'html_block').flatMap(({ content, info, map }) => {\n        const $ = cheerio.load(content);\n        return $('pre code').map(function (index) {\n          return {\n            content: dedent($(this).text().replace(/(\\n)/g, '$1 ')),\n            language: $(this).attr(\"class\"),\n            line: map[0] + 1 + elementLineNumber(content, index)\n          };\n        }).toArray();\n      }))\n    .sort((a, b) => a.line - b.line);\n  return []\n    .concat\n    .apply([], await Promise.all(codeBlocks\n      .flatMap(async ({ content, language, line }) => {\n        content.replace(/<\\/?mark>/, '');\n        const error = message => new ParseError(`${line}:\\n${message}`);\n        config = Object.assign(config, {\n          directives: [\n            ['fails=(.*)', (matches, info) => matches.slice(1).forEach(match => {\n              if (info.hasOwnProperty('expectedOutput')) {\n                throw error('cannot have \"fails\" and \"output\" together');\n              }\n              info.failReason = match;\n            })],\n            ['output=(.*)', (matches, info) => matches.slice(1).forEach(match => {\n              if (info.hasOwnProperty('failReason')) {\n                throw error('cannot have \"fails\" and \"output\" together');\n              }\n              info.expectedOutput = matches[1].replace(/\\\\n/g, '\\n');\n            })]\n          ]\n        });\n        const parsed = await parseCode(content.replace(/<br\\/>/g, ''), language, config);\n        if (!parsed) {\n          return []\n        }\n        parsed.line = line;\n        return [parsed];\n      })));\n};\n\nconst parseMarkdownFile = async (path, config = {}) => {\n  try {\n    const markdown = await promises.readFile(path, 'utf-8');\n    const parsed = await parseMarkdown(markdown, config);\n    return parsed.map(codeInfo => {\n      codeInfo.path = `${path}:${codeInfo.line}`;\n      delete codeInfo.line;\n      return codeInfo;\n    });\n  } catch (err) {\n    if (err instanceof ParseError) {\n      throw new ParseError(`${path}:${err.message}`)\n    } else {\n      throw err;\n    }\n  }\n}\n\nconst compile = async (info, retryOptions = {}) => {\n  const error = (text) => {\n    return `${info.path}:\\n${text}`;\n  };\n  const failureMismatch = (output) => {\n    return new CompileError(-1, error(`should have failed with '${info.failReason}'${output.length > 0 ? `\\nactual output is:\\n${output}` : ''}`));\n  };\n  if (info.failReason) {\n    try {\n      const result = await origCompile(info, retryOptions);\n      throw failureMismatch(result);\n    } catch (err) {\n      if (!err.message.includes(info.failReason)) {\n        throw failureMismatch(err.message);\n      }\n      return err.message;\n    }\n  } else {\n    const result = await (async () => {\n      try {\n        return await origCompile(info, retryOptions);\n      } catch (err) {\n        const code = err.hasOwnProperty('code') ? err.code : -2;\n        throw new CompileError(err.code, error(err.message));\n      }\n    })();\n\n    if (info.hasOwnProperty('expectedOutput') && !result.includes(info.expectedOutput)) {\n      throw new CompileError(-3, error(`output mismatch:\\nactual: ${result}\\nexpected: ${info.expectedOutput}`));\n    }\n\n    return result;\n  }\n};\n\nexport { parseMarkdown, parseMarkdownFile, compile, CompileError 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\ No newline at end of file
diff --git a/packages/reveal-test/rollup.config.js b/packages/reveal-test/rollup.config.js
index 67e68a9..834d36e 100644
--- a/packages/reveal-test/rollup.config.js
+++ b/packages/reveal-test/rollup.config.js
@@ -19,6 +19,6 @@ export default {
     'markdown-it',
     'fs',
     'cheerio',
-    'dedent',
+    'dedent-js',
   ]
 };
diff --git a/packages/reveal-test/src/reveal-test.js b/packages/reveal-test/src/reveal-test.js
index ba73a37..36e5c01 100644
--- a/packages/reveal-test/src/reveal-test.js
+++ b/packages/reveal-test/src/reveal-test.js
@@ -4,7 +4,7 @@ import { parseCode, compile as origCompile, CompileError } from 'compiler-explor
 import MarkdownIt from 'markdown-it';
 import { promises } from 'fs';
 import cheerio from 'cheerio';
-import dedent from 'dedent';
+import dedent from 'dedent-js';
 
 class ParseError extends Error {
   constructor(message) {