diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 744bb1342010..1c38103fe6cb 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -75,6 +75,7 @@ module.exports = {
           { json: "always", js: "always", cjs: "always", mjs: "always" },
         ],
         "import/no-extraneous-dependencies": "off",
+        "no-restricted-imports": ["error", { patterns: ["**/src/**"] }],
       },
     },
     {
diff --git a/Makefile b/Makefile
index 6936a21e86ae..277cc108b40a 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ NODE := $(YARN) node
 
 .PHONY: build build-dist watch lint fix clean test-clean test-only test test-ci publish bootstrap
 
-build: build-bundle
+build: build-no-bundle
 ifneq ("$(BABEL_COVERAGE)", "true")
 	$(MAKE) build-standalone
 endif
@@ -28,8 +28,8 @@ build-bundle: clean clean-lib
 	$(MAKE) build-flow-typings
 	$(MAKE) build-dist
 
-build-bundle-ci: bootstrap-only
-	$(MAKE) build-bundle
+build-ci: bootstrap-only
+	$(MAKE) build-no-bundle-ci
 
 generate-tsconfig:
 	$(NODE) scripts/generators/tsconfig.js
@@ -46,7 +46,7 @@ build-typescript-legacy-typings:
 
 build-standalone: build-babel-standalone
 
-build-standalone-ci: build-bundle-ci
+build-standalone-ci: build-ci
 	$(MAKE) build-standalone
 
 build-babel-standalone:
@@ -61,10 +61,13 @@ build-plugin-transform-runtime-dist:
 	cd packages/babel-plugin-transform-runtime; \
 	$(NODE) scripts/build-dist.js
 
-build-no-bundle: clean clean-lib
+build-no-bundle-ci: clean clean-lib
+	$(YARN) gulp build-dev
+	$(MAKE) build-flow-typings
+	$(MAKE) build-dist
+
+build-no-bundle:clean clean-lib
 	BABEL_ENV=development $(YARN) gulp build-dev
-	# Ensure that build artifacts for types are created during local
-	# development too.
 	$(MAKE) build-flow-typings
 
 watch: build-no-bundle
diff --git a/babel.config.js b/babel.config.js
index 0df5312deef7..383a11d6cd38 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -219,6 +219,7 @@ module.exports = function (api) {
       {
         test: sources.map(source => normalize(source.replace("/src", "/test"))),
         plugins: [
+          "@babel/plugin-proposal-dynamic-import",
           [
             "@babel/transform-modules-commonjs",
             {
diff --git a/jest.config.js b/jest.config.js
index 22fd65c51e14..fd11a502d12d 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,17 +1,5 @@
 const supportsESM = parseInt(process.versions.node) >= 12;
 
-// These tests files are directly importing `src` files rather than the compiled versions
-const importsSrc = [
-  "packages/babel-parser/test/unit/tokenizer/types.js",
-  "packages/babel-parser/test/unit/util/identifier.js",
-  "packages/babel-parser/test/unit/util/location.js",
-  "packages/babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression/test/util.test.js",
-  "packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/util.test.js",
-  "packages/babel-plugin-proposal-optional-chaining/test/util.test.js",
-  "packages/babel-preset-react/test/normalize-options.spec.js",
-  "packages/babel-preset-typescript/test/normalize-options.spec.js",
-];
-
 module.exports = {
   runner: supportsESM ? "./test/jest-light-runner" : "jest-runner",
 
@@ -37,7 +25,6 @@ module.exports = {
     "<rootDir>/build/",
     "<rootDir>/.history/", // local directory for VSCode Extension - https://marketplace.visualstudio.com/items?itemName=xyz.local-history
     "_browser\\.js",
-    ...(supportsESM ? importsSrc : []),
   ],
   testEnvironment: "node",
   setupFilesAfterEnv: ["<rootDir>/test/testSetupFile.js"],
diff --git a/packages/babel-parser/test/unit/tokenizer/types.js b/packages/babel-parser/test/unit/tokenizer/types.js
index f242441bd588..0785c3055e16 100644
--- a/packages/babel-parser/test/unit/tokenizer/types.js
+++ b/packages/babel-parser/test/unit/tokenizer/types.js
@@ -1,6 +1,13 @@
-import { tt, tokenOperatorPrecedence } from "../../../src/tokenizer/types.js";
+const describeSkipPublish = process.env.IS_PUBLISH ? describe.skip : describe;
+
+describeSkipPublish("token types", () => {
+  let tt, tokenOperatorPrecedence;
+  beforeAll(async () => {
+    ({ tt, tokenOperatorPrecedence } = await import(
+      "../../../lib/tokenizer/types.js"
+    ));
+  });
 
-describe("token types", () => {
   it("should check if the binOp for relational === in", () => {
     expect(tokenOperatorPrecedence(tt.relational)).toEqual(
       tokenOperatorPrecedence(tt._in),
diff --git a/packages/babel-parser/test/unit/util/identifier.js b/packages/babel-parser/test/unit/util/identifier.js
index c6c25ec942da..7ac5639eeb83 100644
--- a/packages/babel-parser/test/unit/util/identifier.js
+++ b/packages/babel-parser/test/unit/util/identifier.js
@@ -1,9 +1,13 @@
-import {
-  isKeyword,
-  keywordRelationalOperator,
-} from "../../../src/util/identifier.js";
+const describeSkipPublish = process.env.IS_PUBLISH ? describe.skip : describe;
+
+describeSkipPublish("identifier", () => {
+  let isKeyword, keywordRelationalOperator;
+  beforeAll(async () => {
+    ({ isKeyword, keywordRelationalOperator } = await import(
+      "../../../lib/util/identifier.js"
+    ));
+  });
 
-describe("identifier", () => {
   describe("isKeyword", () => {
     it("break is a keyword", () => {
       expect(isKeyword("break")).toBe(true);
diff --git a/packages/babel-parser/test/unit/util/location.js b/packages/babel-parser/test/unit/util/location.js
index 9c8fb79b37a4..7439ebfeb383 100644
--- a/packages/babel-parser/test/unit/util/location.js
+++ b/packages/babel-parser/test/unit/util/location.js
@@ -1,6 +1,11 @@
-import { getLineInfo } from "../../../src/util/location.js";
+const describeSkipPublish = process.env.IS_PUBLISH ? describe.skip : describe;
+
+describeSkipPublish("getLineInfo", () => {
+  let getLineInfo;
+  beforeAll(async () => {
+    ({ getLineInfo } = await import("../../../lib/util/location.js"));
+  });
 
-describe("getLineInfo", () => {
   const input = "a\nb\nc\nd\ne\nf\ng\nh\ni";
 
   it("reports correct position", () => {
diff --git a/packages/babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression/test/util.test.js b/packages/babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression/test/util.test.js
index f6e9282e42fa..23a34a258639 100644
--- a/packages/babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression/test/util.test.js
+++ b/packages/babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression/test/util.test.js
@@ -1,5 +1,4 @@
 import { parseSync, traverse } from "@babel/core";
-import { shouldTransform } from "../src/util.ts";
 
 function getPath(input, parserOpts = {}) {
   let targetPath;
@@ -19,7 +18,14 @@ function getPath(input, parserOpts = {}) {
   return targetPath;
 }
 
-describe("shouldTransform", () => {
+const describeSkipPublish = process.env.IS_PUBLISH ? describe.skip : describe;
+
+describeSkipPublish("shouldTransform", () => {
+  let shouldTransform;
+  beforeAll(async () => {
+    ({ shouldTransform } = await import("../lib/util.js"));
+  });
+
   const positiveCases = [
     "(function a([a]) {})",
     "({ b: function a([a]) {} })",
diff --git a/packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/util.test.js b/packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/util.test.js
index 89bc17afb5d7..9147705cced4 100644
--- a/packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/util.test.js
+++ b/packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining/test/util.test.js
@@ -1,5 +1,4 @@
 import { parseSync, traverse } from "@babel/core";
-import { shouldTransform } from "../src/util.ts";
 
 function getPath(input, parserOpts = {}) {
   let targetPath;
@@ -20,7 +19,14 @@ function getPath(input, parserOpts = {}) {
   return targetPath;
 }
 
-describe("shouldTransform", () => {
+const describeSkipPublish = process.env.IS_PUBLISH ? describe.skip : describe;
+
+describeSkipPublish("shouldTransform", () => {
+  let shouldTransform;
+  beforeAll(async () => {
+    ({ shouldTransform } = await import("../lib/util.js"));
+  });
+
   const positiveCases = [
     "fn?.(...[], 0)",
     "fn?.(...[], ...[])",
diff --git a/packages/babel-plugin-proposal-optional-chaining/test/util.test.js b/packages/babel-plugin-proposal-optional-chaining/test/util.test.js
index d2b8a3d83331..afbd65c9ff19 100644
--- a/packages/babel-plugin-proposal-optional-chaining/test/util.test.js
+++ b/packages/babel-plugin-proposal-optional-chaining/test/util.test.js
@@ -1,4 +1,3 @@
-import { willPathCastToBoolean } from "../src/util.js";
 import { parseSync, traverse } from "@babel/core";
 
 function getPath(input, parserOpts) {
@@ -13,7 +12,14 @@ function getPath(input, parserOpts) {
   return targetPath;
 }
 
-describe("willPathCastToBoolean", () => {
+const describeSkipPublish = process.env.IS_PUBLISH ? describe.skip : describe;
+
+describeSkipPublish("willPathCastToBoolean", () => {
+  let willPathCastToBoolean;
+  beforeAll(async () => {
+    ({ willPathCastToBoolean } = await import("../lib/util.js"));
+  });
+
   const positiveCases = [
     "if(a?.b) {}",
     "while(a?.b) {}",
diff --git a/packages/babel-preset-react/test/normalize-options.spec.js b/packages/babel-preset-react/test/normalize-options.spec.js
index b3e1b8dee390..bbb2ab7299c5 100644
--- a/packages/babel-preset-react/test/normalize-options.spec.js
+++ b/packages/babel-preset-react/test/normalize-options.spec.js
@@ -1,5 +1,13 @@
-import normalizeOptions from "../src/normalize-options.js";
-describe("normalize options", () => {
+const describeSkipPublish = process.env.IS_PUBLISH ? describe.skip : describe;
+
+describeSkipPublish("normalize options", () => {
+  let normalizeOptions;
+  beforeAll(async () => {
+    ({
+      default: { default: normalizeOptions },
+    } = await import("../lib/normalize-options.js"));
+  });
+
   (process.env.BABEL_8_BREAKING ? describe : describe.skip)("Babel 8", () => {
     it("should throw on unknown options", () => {
       expect(() => normalizeOptions({ throwIfNamespaces: true })).toThrowError(
diff --git a/packages/babel-preset-typescript/test/normalize-options.spec.js b/packages/babel-preset-typescript/test/normalize-options.spec.js
index 710c9dc797c6..6553964e2c5e 100644
--- a/packages/babel-preset-typescript/test/normalize-options.spec.js
+++ b/packages/babel-preset-typescript/test/normalize-options.spec.js
@@ -1,5 +1,13 @@
-import normalizeOptions from "../src/normalize-options.js";
-describe("normalize options", () => {
+const describeSkipPublish = process.env.IS_PUBLISH ? describe.skip : describe;
+
+describeSkipPublish("normalize options", () => {
+  let normalizeOptions;
+  beforeAll(async () => {
+    ({
+      default: { default: normalizeOptions },
+    } = await import("../lib/normalize-options.js"));
+  });
+
   (process.env.BABEL_8_BREAKING ? describe : describe.skip)("Babel 8", () => {
     it("should throw on unknown options", () => {
       expect(() => normalizeOptions({ allowNamespace: true })).toThrowError(