diff --git a/package.json b/package.json
index 8618d5c1ac..bfd88c4986 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,9 @@
     "test:ci": "yarn check --integrity && npm run prettier:check && npm run lint -- --no-cache && npm run check && npm run testonly:cover && npm run check:ts && npm run check:spelling && npm run build",
     "testonly": "mocha --full-trace src/**/__tests__/**/*-test.js",
     "testonly:cover": "nyc npm run testonly",
-    "lint": "eslint --rulesdir './resources/eslint-rules' --rule 'no-dir-import: error' --cache --ext .js,.ts src resources",
+    "prelint": "node resources/generate-exported",
+    "lint": "eslint --rulesdir './resources/eslint-rules' --rule 'no-dir-import: error' --cache --ext .js,.ts src resources && eslint --rulesdir ./resources/eslint-rules/ --rule 'internal-func: 1'  src --ignore-pattern 'src/jsutils/*' --ignore-pattern 'src/polyfills/*' --ignore-pattern 'src/**/__tests__/**' --ignore-pattern 'src/__tests__/*'",
+    "postlint": "rm resources/babel-plugins/map.json",
     "benchmark": "node --noconcurrent_sweeping --expose-gc --predictable ./resources/benchmark.js",
     "prettier": "prettier --ignore-path .gitignore --write --list-different \"**/*.{js,ts,md,json,yml}\"",
     "prettier:check": "prettier --ignore-path .gitignore --check \"**/*.{js,ts,md,json,yml}\"",
diff --git a/resources/babel-plugins/extract-exports.js b/resources/babel-plugins/extract-exports.js
new file mode 100644
index 0000000000..d3e5f61aa4
--- /dev/null
+++ b/resources/babel-plugins/extract-exports.js
@@ -0,0 +1,117 @@
+// @flow strict
+
+'use strict';
+
+// @noflow
+
+const path = require('path');
+const fs = require('fs');
+
+const { HashMap } = require('./helper');
+
+// Create a new Hashmap to store file names and declarations
+const mp = new HashMap();
+
+// All the rules that are required by plugin
+const ExportNamedDeclaration = {
+  enter(babelPath, state) {
+    if (babelPath.node.declaration) {
+      return handleDeclaration(babelPath, state);
+    }
+
+    if (babelPath.node.specifiers) {
+      return handleNodeSpecifiers(
+        babelPath.node.specifiers,
+        state,
+        babelPath.node.source ? babelPath.node.source.value : undefined,
+      );
+    }
+  },
+};
+
+const ExportAllDeclaration = {
+  enter(babelPath, state) {
+    mp.add(
+      '*',
+      state,
+      babelPath.node.source ? babelPath.node.source.value : undefined,
+    );
+  },
+};
+
+module.exports = function() {
+  return {
+    visitor: {
+      ExportNamedDeclaration,
+      ExportAllDeclaration,
+      ExportDefaultDeclaration: ExportNamedDeclaration,
+      Program: {
+        exit() {
+          return writeToJSON();
+        },
+      },
+    },
+  };
+};
+
+// Helper functions for the rules
+function handleDeclaration(babelPath, state) {
+  switch (babelPath.node.declaration.type) {
+    case 'VariableDeclaration':
+      return handleVariableDeclarations(
+        babelPath.node.declaration,
+        state,
+        babelPath.node.source ? babelPath.node.source.value : undefined,
+      );
+    case 'FunctionDeclaration':
+    case 'ClassDeclaration':
+      return handleFunctionDeclarations(
+        babelPath.node.declaration,
+        state,
+        babelPath.node.source ? babelPath.node.source.value : undefined,
+      );
+  }
+}
+
+function handleNodeSpecifiers(specifiers, state, source) {
+  return specifiers.forEach(specifier => {
+    switch (specifier.type) {
+      case 'ExportSpecifier':
+        mp.add(specifier.local.name, state, source);
+        break;
+      case 'ExportNamespaceSpecifier':
+        mp.add('*', state, source);
+        break;
+    }
+  });
+}
+
+function handleVariableDeclarations(variableDeclaration, state, source) {
+  variableDeclaration.declarations.forEach(declaration =>
+    mp.add(declaration.id.name, state, source),
+  );
+}
+
+function handleFunctionDeclarations(declaration, state, source) {
+  return mp.add(declaration.id.name, state, source);
+}
+
+// To write final result to JSON file
+function writeToJSON() {
+  if (!fs.existsSync(path.join(__dirname, '/map.json'))) {
+    fs.writeFileSync(path.join(__dirname, '/map.json'), JSON.stringify({}));
+  }
+  const exportedValues = require(path.join(__dirname, '/map.json'));
+  for (const key of mp.keys()) {
+    exportedValues[key] = exportedValues[key] || [];
+
+    exportedValues[key] = exportedValues[key].concat(Array.from(mp.get(key)));
+
+    exportedValues[key] = Array.from(new Set(exportedValues[key]));
+  }
+
+  fs.writeFileSync(
+    path.join(__dirname, '/map.json'),
+    JSON.stringify(exportedValues),
+  );
+}
diff --git a/resources/babel-plugins/helper/index.js b/resources/babel-plugins/helper/index.js
new file mode 100644
index 0000000000..c08604e37c
--- /dev/null
+++ b/resources/babel-plugins/helper/index.js
@@ -0,0 +1,33 @@
+// @flow strict
+
+'use strict';
+const path = require('path');
+
+class HashMap {
+  constructor() {
+    this._map = new Map();
+  }
+
+  add(value, state, source) {
+    let filepath = path.resolve(state.file.opts.filename);
+    if (source) {
+      const pathArray = state.file.opts.filename.split('/');
+      const directoryPath = pathArray.slice(0, pathArray.length - 1).join('/');
+      filepath = require.resolve(path.resolve(directoryPath, source));
+    }
+    if (!this._map.has(filepath)) {
+      this._map.set(filepath, new Set());
+    }
+    this._map.get(filepath).add(value);
+  }
+
+  get(key) {
+    return this._map.get(key);
+  }
+
+  keys() {
+    return this._map.keys();
+  }
+}
+
+module.exports = { HashMap };
diff --git a/resources/eslint-rules/internal-func.js b/resources/eslint-rules/internal-func.js
new file mode 100644
index 0000000000..021e1c2171
--- /dev/null
+++ b/resources/eslint-rules/internal-func.js
@@ -0,0 +1,49 @@
+// @flow strict
+
+// @noflow
+
+'use strict';
+const path = require('path');
+
+const listOfExports = require(path.join(
+  process.cwd(),
+  '/resources/babel-plugins/',
+  'map.json',
+));
+module.exports = {
+  create(context) {
+    function isExportedLocallyOnly(name) {
+      if (!listOfExports[context.getFilename()]) {
+        return true;
+      }
+      return !listOfExports[context.getFilename()].find(
+        value => value === name || value === '*',
+      );
+    }
+
+    const source = context.getSourceCode();
+    /**
+     *
+     */
+    return {
+      'ExportNamedDeclaration > :matches(FunctionDeclaration,ClassDeclaration)'(
+        node,
+      ) {
+        if (isExportedLocallyOnly(node.id.name)) {
+          if (!source.getJSDocComment(node)) {
+            return context.report({
+              node,
+              message: 'Please enter JSDoC internal functions using @internal',
+            });
+          }
+          if (!source.getJSDocComment(node).value.includes('@internal')) {
+            context.report({
+              node,
+              message: 'Please annotate internal functions using @internal',
+            });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/resources/generate-exported.js b/resources/generate-exported.js
new file mode 100644
index 0000000000..094096d05e
--- /dev/null
+++ b/resources/generate-exported.js
@@ -0,0 +1,26 @@
+// @noflow
+
+'use strict';
+
+const babel = require('@babel/core');
+const flowTypesPlugin = require('@babel/plugin-transform-flow-strip-types');
+
+const extractExportPlugin = require('./babel-plugins/extract-exports');
+
+const directoriesToScan = [
+  '/src',
+  '/src/error',
+  '/src/type',
+  '/src/language',
+  '/src/validation',
+  '/src/utilities',
+  '/src/execution',
+  '/src/subscription',
+];
+
+directoriesToScan.forEach(path =>
+  babel.transformFileSync(process.cwd() + path + '/index.js', {
+    babelrc: false,
+    plugins: [flowTypesPlugin, extractExportPlugin],
+  }),
+);
diff --git a/src/language/ast.js b/src/language/ast.js
index 9d5df64d86..83a75e0a2e 100644
--- a/src/language/ast.js
+++ b/src/language/ast.js
@@ -8,6 +8,7 @@ import { type TokenKindEnum } from './tokenKind';
 /**
  * Contains a range of UTF-8 character offsets and token references that
  * identify the region of the source from which the AST derived.
+ * @internal
  */
 export class Location {
   /**
@@ -52,6 +53,7 @@ defineToJSON(Location, function() {
 /**
  * Represents a range of characters represented by a lexical token
  * within a Source.
+ * @internal
  */
 export class Token {
   /**
diff --git a/src/validation/ValidationContext.js b/src/validation/ValidationContext.js
index a8f720a05e..3c68cc2dbc 100644
--- a/src/validation/ValidationContext.js
+++ b/src/validation/ValidationContext.js
@@ -38,6 +38,7 @@ type VariableUsage = {|
  * An instance of this class is passed as the "this" context to all validators,
  * allowing access to commonly useful contextual information from within a
  * validation rule.
+ * @internal
  */
 export class ASTValidationContext {
   _ast: DocumentNode;
@@ -133,6 +134,9 @@ export class ASTValidationContext {
 
 export type ASTValidationRule = ASTValidationContext => ASTVisitor;
 
+/**
+ * @internal
+ */
 export class SDLValidationContext extends ASTValidationContext {
   _schema: ?GraphQLSchema;