diff --git a/src/HighlightLines.js b/src/HighlightLines.js
deleted file mode 100644
index 4aa8312..0000000
--- a/src/HighlightLines.js
+++ /dev/null
@@ -1,33 +0,0 @@
-class HighlightLines {
-  constructor(rangeStr) {
-    this.highlights = this.convertRangeToHash(rangeStr);
-  }
-
-  convertRangeToHash(rangeStr) {
-    let hash = {};
-    if( !rangeStr ) {
-      return hash;
-    }
-
-    let ranges = rangeStr.split(",").map(function(range) {
-      return range.trim();
-    });
-
-    for(let range of ranges) {
-      let startFinish = range.split('-');
-      let start = parseInt(startFinish[0], 10);
-      let end = parseInt(startFinish[1] || start, 10);
-
-      for( let j = start, k = end; j<=k; j++ ) {
-        hash[j] = true;
-      }
-    }
-    return hash;
-  }
-
-  isHighlighted(lineNumber) {
-    return !!this.highlights[lineNumber];
-  }
-}
-
-module.exports = HighlightLines;
diff --git a/src/HighlightLinesGroup.js b/src/HighlightLinesGroup.js
deleted file mode 100644
index 47c0aaa..0000000
--- a/src/HighlightLinesGroup.js
+++ /dev/null
@@ -1,68 +0,0 @@
-const HighlightLines = require("./HighlightLines");
-
-class HighlightLinesGroup {
-  constructor(str, delimiter) {
-    this.init(str, delimiter);
-  }
-
-  init(str = "", delimiter = " ") {
-    this.str = str;
-    this.delimiter = delimiter;
-
-    let split = str.split(this.delimiter);
-    this.highlights = new HighlightLines(split.length === 1 ? split[0] : "");
-    this.highlightsAdd = new HighlightLines(split.length === 2 ? split[0] : "");
-    this.highlightsRemove = new HighlightLines(split.length === 2 ? split[1] : "");
-  }
-
-  isHighlighted(lineNumber) {
-    return this.highlights.isHighlighted(lineNumber);
-  }
-
-  isHighlightedAdd(lineNumber) {
-    return this.highlightsAdd.isHighlighted(lineNumber);
-  }
-
-  isHighlightedRemove(lineNumber) {
-    return this.highlightsRemove.isHighlighted(lineNumber);
-  }
-
-  hasTagMismatch(line) {
-    let startCount = line.split("<span").length;
-    let endCount = line.split("</span").length;
-    if( startCount !== endCount ) {
-      return true;
-    }
-
-    return false;
-  }
-
-  splitLineMarkup(line, before, after) {
-
-    // skip line highlighting if there is an uneven number of <span> or </span> on the line.
-    // for example, we can’t wrap <span> with <span><span></span>
-    if(this.hasTagMismatch(line)) {
-      return line;
-    }
-
-    return before + line + after;
-  }
-
-  getLineMarkup(lineNumber, line, extraClasses = []) {
-    let extraClassesStr = (extraClasses.length ? " " + extraClasses.join(" ") : "");
-
-    if (this.isHighlighted(lineNumber)) {
-      return this.splitLineMarkup(line, `<mark class="highlight-line highlight-line-active${extraClassesStr}">`, `</mark>`);
-    }
-    if (this.isHighlightedAdd(lineNumber)) {
-      return this.splitLineMarkup(line, `<ins class="highlight-line highlight-line-add${extraClassesStr}">`, `</ins>`);
-    }
-    if (this.isHighlightedRemove(lineNumber)) {
-      return this.splitLineMarkup(line, `<del class="highlight-line highlight-line-remove${extraClassesStr}">`, `</del>`);
-    }
-
-    return this.splitLineMarkup( line, `<span class="highlight-line${extraClassesStr}">`, `</span>`);
-  }
-}
-
-module.exports = HighlightLinesGroup;
diff --git a/src/PrismLoader.js b/src/PrismLoader.js
deleted file mode 100644
index a3515a2..0000000
--- a/src/PrismLoader.js
+++ /dev/null
@@ -1,42 +0,0 @@
-const Prism = require("prismjs");
-const PrismLoader = require("prismjs/components/index.js");
-// Avoid "Language does not exist: " console logs
-PrismLoader.silent = true;
-
-const PrismAlias = require("./PrismNormalizeAlias");
-
-module.exports = function(language) {
-  let diffRemovedRawName = language;
-  if(language.startsWith("diff-")) {
-    diffRemovedRawName = language.substr("diff-".length);
-  }
-  // aliasing should ignore diff-
-  let aliasedName = PrismAlias(diffRemovedRawName);
-
-  if(!Prism.languages[ aliasedName ]) {
-    PrismLoader(aliasedName);
-  }
-  if(!Prism.languages[ aliasedName ]) {
-    throw new Error(`"${language}" is not a valid Prism.js language for eleventy-plugin-syntaxhighlight`);
-  }
-
-  if(!language.startsWith("diff-")) {
-    return Prism.languages[ aliasedName ];
-  }
-
-  // language has diff- prefix
-  let fullLanguageName = `diff-${aliasedName}`;
-
-  if(!Prism.languages.diff) {
-    PrismLoader("diff");
-    // Bundled Plugin
-    require("prismjs/plugins/diff-highlight/prism-diff-highlight");
-  }
-
-  // Store into with aliased keys
-  //   ts -> diff-typescript
-  //   js -> diff-javascript
-  Prism.languages[ fullLanguageName ] = Prism.languages.diff;
-
-  return Prism.languages[ fullLanguageName ];
-};
diff --git a/src/PrismNormalizeAlias.js b/src/PrismNormalizeAlias.js
deleted file mode 100644
index 40e9bb3..0000000
--- a/src/PrismNormalizeAlias.js
+++ /dev/null
@@ -1,42 +0,0 @@
-const Prism = require("prismjs");
-
-const HARDCODED_ALIASES = {
-  njk: "jinja2",
-  nunjucks: "jinja2",
-};
-
-// This was added to make `ts` resolve to `typescript` correctly.
-// The Prism loader doesn’t seem to always handle aliasing correctly.
-module.exports = function(language) {
-  try {
-    // Careful this is not public API stuff:
-    // https://github.com/PrismJS/prism/issues/2146
-    const PrismComponents = require("prismjs/components.json");
-    let langs = PrismComponents.languages;
-
-    // Manual override
-    if(HARDCODED_ALIASES[language]) {
-      language = HARDCODED_ALIASES[language];
-    }
-
-    if(langs[ language ]) {
-      return language;
-    }
-    for(let langName in langs) {
-      if(Array.isArray(langs[langName].alias)) {
-        for(let alias of langs[langName].alias) {
-          if(alias === language) {
-            return langName;
-          }
-        }
-      } else if(langs[langName].alias === language) {
-        return langName;
-      }
-    }
-  } catch(e) {
-    // Couldn’t find the components file, aliases may not resolve correctly
-    // See https://github.com/11ty/eleventy-plugin-syntaxhighlight/issues/19
-  }
-
-  return language;
-}
diff --git a/src/getAttributes.js b/src/getAttributes.js
deleted file mode 100644
index 603c6a5..0000000
--- a/src/getAttributes.js
+++ /dev/null
@@ -1,62 +0,0 @@
-function attributeEntryToString(attribute, context) {
-  let [key, value] = attribute;
-
-  if (typeof value === "function") { // Callback must return a string or a number
-    value = value(context); // Run the provided callback and store the result
-  }
-
-  if (typeof value !== "string" && typeof value !== "number") {
-    throw new Error(
-      `Attribute "${key}" must have, or evaluate to, a value of type string or number, not "${typeof value}".`
-    );
-  }
-
-  return `${key}="${value}"`;
-}
-
-/**
- * ## Usage
- * The function `getAttributes` is used to convert an object, `attributes`, with HTML attributes as keys and the values as the corresponding HTML attribute's values.
- * If it is falsey, an empty string will be returned.
- *
- * ```js
-  getAttributes({
-    tabindex: 0,
-    'data-language': function (context) { return context.language; },
-    'data-otherStuff': 'value'
-  }) // => ' tabindex="0" data-language="JavaScript" data-otherStuff="value"'
-  ```
- *
- * @param {{[s: string]: string | number}} attributes An object with key-value pairs that represent attributes.
- * @param {object} context An object with the current context.
- * @param {string} context.content The code to parse and highlight.
- * @param {string} context.language The language for the current instance.
- * @param {object} context.options The options passed to the syntax highlighter.
- * @returns {string} A string containing the above HTML attributes preceded by a single space.
- */
-function getAttributes(attributes, context = {}) {
-  let langClass = context.language ? `language-${context.language}` : "";
-
-  if (!attributes) {
-    return langClass ? ` class="${langClass}"` : "";
-  } else if (typeof attributes === "object") {
-    if(!("class" in attributes) && langClass) {
-      // class attribute should be first in order
-      let tempAttrs = { class: langClass };
-      for(let key in attributes) {
-        tempAttrs[key] = attributes[key];
-      }
-      attributes = tempAttrs;
-    }
-
-    const formattedAttributes = Object.entries(attributes).map(
-      entry => attributeEntryToString(entry, context)
-    );
-
-    return formattedAttributes.length ? ` ${formattedAttributes.join(" ")}` : "";
-  } else if (typeof attributes === "string") {
-    throw new Error("Syntax highlighter plugin custom attributes on <pre> and <code> must be an object. Received: " + JSON.stringify(attributes));
-  }
-}
-
-module.exports = getAttributes;