diff --git a/package-lock.json b/package-lock.json
index 77c4bfa3..44c4048e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -38,6 +38,7 @@
 				"gzip-size": "^6.0.0",
 				"kleur": "^4.1.5",
 				"lodash.merge": "^4.6.2",
+				"magic-string": "^0.30.17",
 				"postcss": "^8.2.1",
 				"pretty-bytes": "^5.6.0",
 				"rollup": "^2.70.2",
@@ -3423,9 +3424,9 @@
 			}
 		},
 		"node_modules/@jridgewell/sourcemap-codec": {
-			"version": "1.4.15",
-			"resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.15.tgz",
-			"integrity": "sha512-eF2rxCRulEKXHTRiDrDy6erMYWqNw4LPdQ8UQA4huuxaQsVeRPFl2oM8oDGxMFhJUWZf9McpLtJasDDZb/Bpeg==",
+			"version": "1.5.0",
+			"resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.0.tgz",
+			"integrity": "sha512-gv3ZRaISU3fjPAgNsriBRqGWQL6quFx04YMPW/zD8XMLsU32mhCCbfbO6KZFLjvYpCZ8zyDEgqsgf+PwPaM7GQ==",
 			"license": "MIT"
 		},
 		"node_modules/@jridgewell/trace-mapping": {
@@ -3604,6 +3605,15 @@
 			"resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-2.0.2.tgz",
 			"integrity": "sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w=="
 		},
+		"node_modules/@rollup/plugin-commonjs/node_modules/magic-string": {
+			"version": "0.25.9",
+			"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.9.tgz",
+			"integrity": "sha512-RmF0AsMzgt25qzqqLc1+MbHmhdx0ojF2Fvs4XnOqz2ZOBXzzkEwc/dJQZCYHAn7v1jbVOjAZfK8msRn4BxO4VQ==",
+			"license": "MIT",
+			"dependencies": {
+				"sourcemap-codec": "^1.4.8"
+			}
+		},
 		"node_modules/@rollup/plugin-json": {
 			"version": "4.1.0",
 			"resolved": "https://registry.npmjs.org/@rollup/plugin-json/-/plugin-json-4.1.0.tgz",
@@ -3677,6 +3687,15 @@
 				"string.prototype.matchall": "^4.0.6"
 			}
 		},
+		"node_modules/@surma/rollup-plugin-off-main-thread/node_modules/magic-string": {
+			"version": "0.25.9",
+			"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.9.tgz",
+			"integrity": "sha512-RmF0AsMzgt25qzqqLc1+MbHmhdx0ojF2Fvs4XnOqz2ZOBXzzkEwc/dJQZCYHAn7v1jbVOjAZfK8msRn4BxO4VQ==",
+			"license": "MIT",
+			"dependencies": {
+				"sourcemap-codec": "^1.4.8"
+			}
+		},
 		"node_modules/@tootallnate/once": {
 			"version": "1.1.2",
 			"resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
@@ -4755,9 +4774,9 @@
 			"dev": true
 		},
 		"node_modules/caniuse-lite": {
-			"version": "1.0.30001627",
-			"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001627.tgz",
-			"integrity": "sha512-4zgNiB8nTyV/tHhwZrFs88ryjls/lHiqFhrxCW4qSTeuRByBVnPYpDInchOIySWknznucaf31Z4KYqjfbrecVw==",
+			"version": "1.0.30001690",
+			"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001690.tgz",
+			"integrity": "sha512-5ExiE3qQN6oF8Clf8ifIDcMRCRE/dMGcETG/XGMD8/XiXm6HXQgQTh1yZYLXXpSOsEUlJm1Xr7kGULZTuGtP/w==",
 			"funding": [
 				{
 					"type": "opencollective",
@@ -11336,11 +11355,12 @@
 			}
 		},
 		"node_modules/magic-string": {
-			"version": "0.25.7",
-			"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.7.tgz",
-			"integrity": "sha512-4CrMT5DOHTDk4HYDlzmwu4FVCcIYI8gauveasrdCu2IKIFOJ3f0v/8MDGJCDL9oD2ppz/Av1b0Nj345H9M+XIA==",
+			"version": "0.30.17",
+			"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.17.tgz",
+			"integrity": "sha512-sNPKHvyjVf7gyjwS4xGTaW/mCnF8wnjtifKBEhxfZ7E/S8tQ0rssrwGNn6q8JH/ohItJfSQp9mBtQYuTlH5QnA==",
+			"license": "MIT",
 			"dependencies": {
-				"sourcemap-codec": "^1.4.4"
+				"@jridgewell/sourcemap-codec": "^1.5.0"
 			}
 		},
 		"node_modules/make-dir": {
@@ -14519,7 +14539,9 @@
 		"node_modules/sourcemap-codec": {
 			"version": "1.4.8",
 			"resolved": "https://registry.npmjs.org/sourcemap-codec/-/sourcemap-codec-1.4.8.tgz",
-			"integrity": "sha512-9NykojV5Uih4lgo5So5dtw+f0JgJX30KCNI8gwhz2J9A15wD0Ml6tjHKwf6fTSa6fAdVBdZeNOs9eJ71qCk8vA=="
+			"integrity": "sha512-9NykojV5Uih4lgo5So5dtw+f0JgJX30KCNI8gwhz2J9A15wD0Ml6tjHKwf6fTSa6fAdVBdZeNOs9eJ71qCk8vA==",
+			"deprecated": "Please use @jridgewell/sourcemap-codec instead",
+			"license": "MIT"
 		},
 		"node_modules/spawndamnit": {
 			"version": "2.0.0",
@@ -18325,9 +18347,9 @@
 			}
 		},
 		"@jridgewell/sourcemap-codec": {
-			"version": "1.4.15",
-			"resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.15.tgz",
-			"integrity": "sha512-eF2rxCRulEKXHTRiDrDy6erMYWqNw4LPdQ8UQA4huuxaQsVeRPFl2oM8oDGxMFhJUWZf9McpLtJasDDZb/Bpeg=="
+			"version": "1.5.0",
+			"resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.0.tgz",
+			"integrity": "sha512-gv3ZRaISU3fjPAgNsriBRqGWQL6quFx04YMPW/zD8XMLsU32mhCCbfbO6KZFLjvYpCZ8zyDEgqsgf+PwPaM7GQ=="
 		},
 		"@jridgewell/trace-mapping": {
 			"version": "0.3.25",
@@ -18463,6 +18485,14 @@
 					"version": "2.0.2",
 					"resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-2.0.2.tgz",
 					"integrity": "sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w=="
+				},
+				"magic-string": {
+					"version": "0.25.9",
+					"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.9.tgz",
+					"integrity": "sha512-RmF0AsMzgt25qzqqLc1+MbHmhdx0ojF2Fvs4XnOqz2ZOBXzzkEwc/dJQZCYHAn7v1jbVOjAZfK8msRn4BxO4VQ==",
+					"requires": {
+						"sourcemap-codec": "^1.4.8"
+					}
 				}
 			}
 		},
@@ -18524,6 +18554,16 @@
 				"json5": "^2.2.0",
 				"magic-string": "^0.25.0",
 				"string.prototype.matchall": "^4.0.6"
+			},
+			"dependencies": {
+				"magic-string": {
+					"version": "0.25.9",
+					"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.9.tgz",
+					"integrity": "sha512-RmF0AsMzgt25qzqqLc1+MbHmhdx0ojF2Fvs4XnOqz2ZOBXzzkEwc/dJQZCYHAn7v1jbVOjAZfK8msRn4BxO4VQ==",
+					"requires": {
+						"sourcemap-codec": "^1.4.8"
+					}
+				}
 			}
 		},
 		"@tootallnate/once": {
@@ -19341,9 +19381,9 @@
 			"dev": true
 		},
 		"caniuse-lite": {
-			"version": "1.0.30001627",
-			"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001627.tgz",
-			"integrity": "sha512-4zgNiB8nTyV/tHhwZrFs88ryjls/lHiqFhrxCW4qSTeuRByBVnPYpDInchOIySWknznucaf31Z4KYqjfbrecVw=="
+			"version": "1.0.30001690",
+			"resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001690.tgz",
+			"integrity": "sha512-5ExiE3qQN6oF8Clf8ifIDcMRCRE/dMGcETG/XGMD8/XiXm6HXQgQTh1yZYLXXpSOsEUlJm1Xr7kGULZTuGtP/w=="
 		},
 		"chalk": {
 			"version": "2.4.2",
@@ -24060,11 +24100,11 @@
 			}
 		},
 		"magic-string": {
-			"version": "0.25.7",
-			"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.7.tgz",
-			"integrity": "sha512-4CrMT5DOHTDk4HYDlzmwu4FVCcIYI8gauveasrdCu2IKIFOJ3f0v/8MDGJCDL9oD2ppz/Av1b0Nj345H9M+XIA==",
+			"version": "0.30.17",
+			"resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.17.tgz",
+			"integrity": "sha512-sNPKHvyjVf7gyjwS4xGTaW/mCnF8wnjtifKBEhxfZ7E/S8tQ0rssrwGNn6q8JH/ohItJfSQp9mBtQYuTlH5QnA==",
 			"requires": {
-				"sourcemap-codec": "^1.4.4"
+				"@jridgewell/sourcemap-codec": "^1.5.0"
 			}
 		},
 		"make-dir": {
diff --git a/package.json b/package.json
index 2eecdcde..9b0eb6d0 100644
--- a/package.json
+++ b/package.json
@@ -97,6 +97,7 @@
 		"gzip-size": "^6.0.0",
 		"kleur": "^4.1.5",
 		"lodash.merge": "^4.6.2",
+		"magic-string": "^0.30.17",
 		"postcss": "^8.2.1",
 		"pretty-bytes": "^5.6.0",
 		"rollup": "^2.70.2",
diff --git a/src/index.js b/src/index.js
index b5110f9d..96fab3cf 100644
--- a/src/index.js
+++ b/src/index.js
@@ -39,6 +39,7 @@ import {
 import { getConfigFromPkgJson, getName } from './lib/package-info';
 import { shouldCssModules, cssModulesConfig } from './lib/css-modules';
 import { EOL } from 'os';
+import MagicString from 'magic-string';
 
 // Extensions to use when resolving modules
 const EXTENSIONS = ['.ts', '.tsx', '.js', '.jsx', '.es6', '.es', '.mjs'];
@@ -599,15 +600,17 @@ function createConfig(options, entry, format, writeMeta) {
 					({
 						name: 'export-default-simplify',
 						renderChunk(code, chunk, options) {
-							let out = code.replace(
+							const s = new MagicString(code);
+							s.replace(
 								/([};\n])export\s*\{\s*([a-zA-Z0-9_$]+)\s+as\s+default\s*\};/,
 								(s, before, name) => {
 									return `${before}export default ${name};`;
 								},
 							);
-							if (out !== code) {
-								return { code: out, map: null };
-							}
+							return {
+								code: s.toString(),
+								map: s.generateMap({ hires: true }),
+							};
 						},
 					}),
 					options.compress !== false && [