diff --git a/src/components/Highlight.js b/src/components/Highlight.js
index 26bcd0e..8196461 100755
--- a/src/components/Highlight.js
+++ b/src/components/Highlight.js
@@ -1,144 +1,167 @@
-// @flow
-
-import React, { Component, type Node } from "react";
-import normalizeTokens from "../utils/normalizeTokens";
-import themeToDict, { type ThemeDict } from "../utils/themeToDict";
-
-import type {
-  Language,
-  Token,
-  LineInputProps,
-  LineOutputProps,
-  TokenInputProps,
-  TokenOutputProps,
-  RenderProps,
-  PrismLib,
-  PrismTheme
-} from "../types";
-
-type Props = {
-  Prism: PrismLib,
-  theme?: PrismTheme,
-  language: Language,
-  code: string,
-  children: (props: RenderProps) => Node
-};
-
-class Highlight extends Component<Props, *> {
-  prevTheme: PrismTheme | void;
-  prevLanguage: Language | void;
-  themeDict: ThemeDict | void;
-
-  getThemeDict = (props: Props) => {
-    if (
-      this.themeDict !== undefined &&
-      props.theme === this.prevTheme &&
-      props.language === this.prevLanguage
-    ) {
-      return this.themeDict;
-    }
-
-    this.prevTheme = props.theme;
-    this.prevLanguage = props.language;
-
-    const themeDict = props.theme
-      ? themeToDict(props.theme, props.language)
-      : undefined;
-    return (this.themeDict = themeDict);
-  };
-
-  getLineProps = ({
-    key,
-    className,
-    style,
-    line,
-    ...rest
-  }: LineInputProps): LineOutputProps => {
-    const output: LineOutputProps = {
-      ...rest,
-      className: "token-line",
-      style: undefined,
-      key: undefined
-    };
-
-    const themeDict = this.getThemeDict(this.props);
-    if (themeDict !== undefined) {
-      output.style = themeDict.plain;
-    }
-
-    if (style !== undefined) {
-      output.style =
-        output.style !== undefined ? { ...output.style, ...style } : style;
-    }
-
-    if (key !== undefined) output.key = key;
-    if (className) output.className += ` ${className}`;
-
-    return output;
-  };
-
-  getStyleForToken = ({ types, empty }: Token) => {
-    const typesSize = types.length;
-    const themeDict = this.getThemeDict(this.props);
-
-    if (themeDict === undefined) {
-      return undefined;
-    } else if (typesSize === 1 && types[0] === "plain") {
-      return empty ? { display: "inline-block" } : undefined;
-    } else if (typesSize === 1 && !empty) {
-      return themeDict[types[0]];
-    }
-
-    const baseStyle = empty ? { display: "inline-block" } : {};
-    // $FlowFixMe
-    const typeStyles = types.map(type => themeDict[type]);
-    return Object.assign(baseStyle, ...typeStyles);
-  };
-
-  getTokenProps = ({
-    key,
-    className,
-    style,
-    token,
-    ...rest
-  }: TokenInputProps): TokenOutputProps => {
-    const output: TokenOutputProps = {
-      ...rest,
-      className: `token ${token.types.join(" ")}`,
-      children: token.content,
-      style: this.getStyleForToken(token),
-      key: undefined
-    };
-
-    if (style !== undefined) {
-      output.style =
-        output.style !== undefined ? { ...output.style, ...style } : style;
-    }
-
-    if (key !== undefined) output.key = key;
-    if (className) output.className += ` ${className}`;
-
-    return output;
-  };
-
-  render() {
-    const { Prism, language, code, children } = this.props;
-
-    const themeDict = this.getThemeDict(this.props);
-
-    const grammar = Prism.languages[language];
-    const mixedTokens =
-      grammar !== undefined ? Prism.tokenize(code, grammar, language) : [code];
-    const tokens = normalizeTokens(mixedTokens);
-
-    return children({
-      tokens,
-      className: `prism-code language-${language}`,
-      style: themeDict !== undefined ? themeDict.root : {},
-      getLineProps: this.getLineProps,
-      getTokenProps: this.getTokenProps
-    });
-  }
-}
-
-export default Highlight;
+// @flow
+
+import React, { Component, type Node } from "react";
+import normalizeTokens from "../utils/normalizeTokens";
+import themeToDict, { type ThemeDict } from "../utils/themeToDict";
+
+import type {
+  Language,
+  Token,
+  LineInputProps,
+  LineOutputProps,
+  TokenInputProps,
+  TokenOutputProps,
+  RenderProps,
+  PrismGrammar,
+  PrismLib,
+  PrismTheme,
+  PrismToken,
+} from "../types";
+
+type Props = {
+  Prism: PrismLib,
+  theme?: PrismTheme,
+  language: Language,
+  code: string,
+  children: (props: RenderProps) => Node,
+};
+
+class Highlight extends Component<Props, *> {
+  prevTheme: PrismTheme | void;
+  prevLanguage: Language | void;
+  themeDict: ThemeDict | void;
+
+  getThemeDict = (props: Props) => {
+    if (
+      this.themeDict !== undefined &&
+      props.theme === this.prevTheme &&
+      props.language === this.prevLanguage
+    ) {
+      return this.themeDict;
+    }
+
+    this.prevTheme = props.theme;
+    this.prevLanguage = props.language;
+
+    const themeDict = props.theme
+      ? themeToDict(props.theme, props.language)
+      : undefined;
+    return (this.themeDict = themeDict);
+  };
+
+  getLineProps = ({
+    key,
+    className,
+    style,
+    line,
+    ...rest
+  }: LineInputProps): LineOutputProps => {
+    const output: LineOutputProps = {
+      ...rest,
+      className: "token-line",
+      style: undefined,
+      key: undefined,
+    };
+
+    const themeDict = this.getThemeDict(this.props);
+    if (themeDict !== undefined) {
+      output.style = themeDict.plain;
+    }
+
+    if (style !== undefined) {
+      output.style =
+        output.style !== undefined ? { ...output.style, ...style } : style;
+    }
+
+    if (key !== undefined) output.key = key;
+    if (className) output.className += ` ${className}`;
+
+    return output;
+  };
+
+  getStyleForToken = ({ types, empty }: Token) => {
+    const typesSize = types.length;
+    const themeDict = this.getThemeDict(this.props);
+
+    if (themeDict === undefined) {
+      return undefined;
+    } else if (typesSize === 1 && types[0] === "plain") {
+      return empty ? { display: "inline-block" } : undefined;
+    } else if (typesSize === 1 && !empty) {
+      return themeDict[types[0]];
+    }
+
+    const baseStyle = empty ? { display: "inline-block" } : {};
+    // $FlowFixMe
+    const typeStyles = types.map((type) => themeDict[type]);
+    return Object.assign(baseStyle, ...typeStyles);
+  };
+
+  getTokenProps = ({
+    key,
+    className,
+    style,
+    token,
+    ...rest
+  }: TokenInputProps): TokenOutputProps => {
+    const output: TokenOutputProps = {
+      ...rest,
+      className: `token ${token.types.join(" ")}`,
+      children: token.content,
+      style: this.getStyleForToken(token),
+      key: undefined,
+    };
+
+    if (style !== undefined) {
+      output.style =
+        output.style !== undefined ? { ...output.style, ...style } : style;
+    }
+
+    if (key !== undefined) output.key = key;
+    if (className) output.className += ` ${className}`;
+
+    return output;
+  };
+
+  tokenize = (
+    Prism: PrismLib,
+    code: string,
+    grammar: PrismGrammar,
+    language: Language
+  ): Array<PrismToken> => {
+    const env = {
+      code,
+      grammar,
+      language,
+    };
+
+    Prism.hooks.run("before-tokenize", env);
+    env.tokens = Prism.tokenize(env.code, env.grammar, env.language);
+    Prism.hooks.run("after-tokenize", env);
+
+    return env.tokens;
+  };
+
+  render() {
+    const { Prism, language, code, children } = this.props;
+
+    const themeDict = this.getThemeDict(this.props);
+
+    const grammar = Prism.languages[language];
+    const mixedTokens =
+      grammar !== undefined
+        ? this.tokenize(Prism, code, grammar, language)
+        : [code];
+    const tokens = normalizeTokens(mixedTokens);
+
+    return children({
+      tokens,
+      className: `prism-code language-${language}`,
+      style: themeDict !== undefined ? themeDict.root : {},
+      getLineProps: this.getLineProps,
+      getTokenProps: this.getTokenProps,
+    });
+  }
+}
+
+export default Highlight;
diff --git a/src/types.js b/src/types.js
index a335264..bb33d54 100755
--- a/src/types.js
+++ b/src/types.js
@@ -5,7 +5,7 @@ import includedLangs from "./vendor/prism/includeLangs";
 
 export type Language = $Keys<typeof includedLangs>;
 
-type PrismGrammar = {
+export type PrismGrammar = {
   [key: string]: mixed
 };