diff --git a/core/generator.ts b/core/generator.ts
index f70856367f3..e3fd05b06f9 100644
--- a/core/generator.ts
+++ b/core/generator.ts
@@ -37,7 +37,7 @@ export type BlockGenerator = (
 /**
  * Class for a code generator that translates the blocks into a language.
  */
-export class CodeGenerator {
+export abstract class CodeGenerator {
   name_: string;
 
   /** A dictionary of block generator functions keyed by block type. */
@@ -170,10 +170,6 @@ export class CodeGenerator {
     return codeString;
   }
 
-  // The following are some helpful functions which can be used by multiple
-
-  // languages.
-
   /**
    * Prepend a common prefix onto each line of code.
    * Intended for indenting code or adding comment markers.
@@ -441,6 +437,10 @@ export class CodeGenerator {
     return msg.replace(/%1/g, "'" + id + "'");
   }
 
+  abstract quote_(toQuote: string): string;
+
+  abstract multiline_quote_(toQuote: string): string;
+
   /**
    * Add one or more words to the list of reserved words for this language.
    *
diff --git a/generators/dart/dart_generator.js b/generators/dart/dart_generator.js
index 5f64e919f34..e43c025a92b 100644
--- a/generators/dart/dart_generator.js
+++ b/generators/dart/dart_generator.js
@@ -176,7 +176,6 @@ export class DartGenerator extends CodeGenerator {
    * Encode a string as a properly escaped Dart string, complete with quotes.
    * @param {string} string Text to encode.
    * @return {string} Dart string.
-   * @protected
    */
   quote_(string) {
     // Can't use goog.string.quote since $ must also be escaped.
@@ -192,7 +191,6 @@ export class DartGenerator extends CodeGenerator {
    * quotes.
    * @param {string} string Text to encode.
    * @return {string} Dart string.
-   * @protected
    */
   multiline_quote_(string) {
     const lines = string.split(/\n/g).map(this.quote_);
diff --git a/generators/javascript/javascript_generator.js b/generators/javascript/javascript_generator.js
index 18811011c8b..34e68f5aa0a 100644
--- a/generators/javascript/javascript_generator.js
+++ b/generators/javascript/javascript_generator.js
@@ -206,7 +206,6 @@ export class JavascriptGenerator extends CodeGenerator {
    * quotes.
    * @param {string} string Text to encode.
    * @return {string} JavaScript string.
-   * @protected
    */
   quote_(string) {
     // Can't use goog.string.quote since Google's style guide recommends
@@ -222,7 +221,6 @@ export class JavascriptGenerator extends CodeGenerator {
    * with quotes.
    * @param {string} string Text to encode.
    * @return {string} JavaScript string.
-   * @protected
    */
   multiline_quote_(string) {
     // Can't use goog.string.quote since Google's style guide recommends
diff --git a/generators/lua/lua_generator.js b/generators/lua/lua_generator.js
index 587fea90bc8..ce115963917 100644
--- a/generators/lua/lua_generator.js
+++ b/generators/lua/lua_generator.js
@@ -149,7 +149,6 @@ export class LuaGenerator extends CodeGenerator {
    * quotes.
    * @param {string} string Text to encode.
    * @return {string} Lua string.
-   * @protected
    */
   quote_(string) {
     string = string.replace(/\\/g, '\\\\')
@@ -163,7 +162,6 @@ export class LuaGenerator extends CodeGenerator {
    * quotes.
    * @param {string} string Text to encode.
    * @return {string} Lua string.
-   * @protected
    */
   multiline_quote_(string) {
     const lines = string.split(/\n/g).map(this.quote_);
diff --git a/generators/php/php_generator.js b/generators/php/php_generator.js
index 59d595b83df..59e1e67c688 100644
--- a/generators/php/php_generator.js
+++ b/generators/php/php_generator.js
@@ -184,7 +184,6 @@ export class PhpGenerator extends CodeGenerator {
    * quotes.
    * @param {string} string Text to encode.
    * @return {string} PHP string.
-   * @protected
    */
   quote_(string) {
     string = string.replace(/\\/g, '\\\\')
@@ -198,7 +197,6 @@ export class PhpGenerator extends CodeGenerator {
    * quotes.
    * @param {string} string Text to encode.
    * @return {string} PHP string.
-   * @protected
    */
   multiline_quote_(string) {
     const lines = string.split(/\n/g).map(this.quote_);
diff --git a/generators/python/python_generator.js b/generators/python/python_generator.js
index 2f0aabe0c13..5e5836c476f 100644
--- a/generators/python/python_generator.js
+++ b/generators/python/python_generator.js
@@ -228,7 +228,6 @@ export class PythonGenerator extends CodeGenerator {
    * Encode a string as a properly escaped Python string, complete with quotes.
    * @param {string} string Text to encode.
    * @return {string} Python string.
-   * @protected
    */
   quote_(string) {
     string = string.replace(/\\/g, '\\\\').replace(/\n/g, '\\\n');
@@ -250,7 +249,6 @@ export class PythonGenerator extends CodeGenerator {
    * with quotes.
    * @param {string} string Text to encode.
    * @return {string} Python string.
-   * @protected
    */
   multiline_quote_(string) {
     const lines = string.split(/\n/g).map(this.quote_);