diff --git a/.gitignore b/.gitignore
index aac409af..aa076565 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ build/
 # JavaScript related files
 node_modules
 demo/static/app.js
+demo/static/worker.js
 javascript/bundle
 javascript/dist
 javascript/module
diff --git a/demo/package-lock.json b/demo/package-lock.json
index 2e18ae5c..09fac103 100644
--- a/demo/package-lock.json
+++ b/demo/package-lock.json
@@ -19,12 +19,29 @@
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-      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-2.0.0.tgz",
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-      "engines": {
-        "node": ">= 10"
+    "../javascript": {
+      "name": "budoux",
+      "version": "0.5.1",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "commander": "^9.3.0",
+        "jsdom": "^20.0.0"
+      },
+      "bin": {
+        "budoux": "bin/budoux.js"
+      },
+      "devDependencies": {
+        "@types/jasmine": "^4.0.3",
+        "@types/jsdom": "^16.2.14",
+        "@types/node": "^18.0.3",
+        "esbuild": "^0.14.49",
+        "gts": "^4.0.0",
+        "jasmine": "^4.2.1",
+        "jasmine-core": "^4.5.0",
+        "karma": "^6.4.1",
+        "karma-chrome-launcher": "^3.1.1",
+        "karma-jasmine": "^5.1.0",
+        "typescript": "^4.7.4"
       }
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-        "acorn": "bin/acorn"
-      },
-      "engines": {
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-        "acorn-walk": "^8.0.2"
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-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
-      "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
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-      },
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@@ -140,11 +92,6 @@
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@@ -158,16 +105,8 @@
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-      "resolved": "file:../javascript",
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-        "jsdom": "^20.0.0"
-      },
-      "bin": {
-        "budoux": "bin/budoux.js"
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+      "resolved": "../javascript",
+      "link": true
     },
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@@ -239,25 +178,6 @@
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@@ -290,40 +210,6 @@
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       "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
       "dev": true
     },
-    "mime-db": {
-      "version": "1.52.0",
-      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
-      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg=="
-    },
-    "mime-types": {
-      "version": "2.1.35",
-      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
-      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
-      "requires": {
-        "mime-db": "1.52.0"
-      }
-    },
     "minimist": {
       "version": "1.2.6",
       "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.6.tgz",
@@ -2421,11 +1576,6 @@
       "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
       "dev": true
     },
-    "nwsapi": {
-      "version": "2.2.4",
-      "resolved": "https://registry.npmjs.org/nwsapi/-/nwsapi-2.2.4.tgz",
-      "integrity": "sha512-NHj4rzRo0tQdijE9ZqAx6kYDcoRwYwSYzCA8MY3JzfxlrvEU0jhnhJT9BhqhJs7I/dKcrDm6TyulaRqZPIhN5g=="
-    },
     "object-inspect": {
       "version": "1.12.2",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.12.2.tgz",
@@ -2438,27 +1588,6 @@
       "integrity": "sha512-ur5UIdyw5Y7yEj9wLzhqXiy6GZ3Mwx0yGI+5sMn2r0N0v3cKJvUmFH5yPP+WXh9e0xfyzyJX95D8l088DNFj7A==",
       "dev": true
     },
-    "optionator": {
-      "version": "0.8.3",
-      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
-      "integrity": "sha512-+IW9pACdk3XWmmTXG8m3upGUJst5XRGzxMRjXzAuJ1XnIFNvfhjjIuYkDvysnPQ7qzqVzLt78BCruntqRhWQbA==",
-      "requires": {
-        "deep-is": "~0.1.3",
-        "fast-levenshtein": "~2.0.6",
-        "levn": "~0.3.0",
-        "prelude-ls": "~1.1.2",
-        "type-check": "~0.3.2",
-        "word-wrap": "~1.2.3"
-      }
-    },
-    "parse5": {
-      "version": "7.1.2",
-      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.1.2.tgz",
-      "integrity": "sha512-Czj1WaSVpaoj0wbhMzLmWD69anp2WH7FXMB9n1Sy8/ZFF9jolSQVMu1Ij5WIyGmcBmhk7EOndpO4mIpihVqAXw==",
-      "requires": {
-        "entities": "^4.4.0"
-      }
-    },
     "portfinder": {
       "version": "1.0.28",
       "resolved": "https://registry.npmjs.org/portfinder/-/portfinder-1.0.28.tgz",
@@ -2470,21 +1599,6 @@
         "mkdirp": "^0.5.5"
       }
     },
-    "prelude-ls": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
-      "integrity": "sha512-ESF23V4SKG6lVSGZgYNpbsiaAkdab6ZgOxe52p7+Kid3W3u3bxR4Vfd/o21dmN7jSt0IwgZ4v5MUd26FEtXE9w=="
-    },
-    "psl": {
-      "version": "1.9.0",
-      "resolved": "https://registry.npmjs.org/psl/-/psl-1.9.0.tgz",
-      "integrity": "sha512-E/ZsdU4HLs/68gYzgGTkMicWTLPdAftJLfJFlLUAAKZGkStNU72sZjT66SnMDVOfOWY/YAoiD7Jxa9iHvngcag=="
-    },
-    "punycode": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.0.tgz",
-      "integrity": "sha512-rRV+zQD8tVFys26lAGR9WUuS4iUAngJScM+ZRSKtvl5tKeZ2t5bvdNFdNHBW9FWR4guGHlgmsZ1G7BSm2wTbuA=="
-    },
     "qs": {
       "version": "6.11.0",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
@@ -2494,11 +1608,6 @@
         "side-channel": "^1.0.4"
       }
     },
-    "querystringify": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/querystringify/-/querystringify-2.2.0.tgz",
-      "integrity": "sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ=="
-    },
     "require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -2508,7 +1617,8 @@
     "requires-port": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
-      "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ=="
+      "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
+      "dev": true
     },
     "rxjs": {
       "version": "7.5.5",
@@ -2528,15 +1638,8 @@
     "safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
-      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
-    },
-    "saxes": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/saxes/-/saxes-6.0.0.tgz",
-      "integrity": "sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==",
-      "requires": {
-        "xmlchars": "^2.2.0"
-      }
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "dev": true
     },
     "secure-compare": {
       "version": "3.0.1",
@@ -2561,12 +1664,6 @@
         "object-inspect": "^1.9.0"
       }
     },
-    "source-map": {
-      "version": "0.6.1",
-      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-      "optional": true
-    },
     "spawn-command": {
       "version": "0.0.2-1",
       "resolved": "https://registry.npmjs.org/spawn-command/-/spawn-command-0.0.2-1.tgz",
@@ -2602,30 +1699,6 @@
         "has-flag": "^4.0.0"
       }
     },
-    "symbol-tree": {
-      "version": "3.2.4",
-      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
-      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw=="
-    },
-    "tough-cookie": {
-      "version": "4.1.2",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.1.2.tgz",
-      "integrity": "sha512-G9fqXWoYFZgTc2z8Q5zaHy/vJMjm+WV0AkAeHxVCQiEB1b+dGvWzFW6QV07cY5jQ5gRkeid2qIkzkxUnmoQZUQ==",
-      "requires": {
-        "psl": "^1.1.33",
-        "punycode": "^2.1.1",
-        "universalify": "^0.2.0",
-        "url-parse": "^1.5.3"
-      }
-    },
-    "tr46": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/tr46/-/tr46-3.0.0.tgz",
-      "integrity": "sha512-l7FvfAHlcmulp8kr+flpQZmVwtu7nfRV7NZujtN0OqES8EL4O4e0qqzL0DC5gAvx/ZC/9lk6rhcUwYvkBnBnYA==",
-      "requires": {
-        "punycode": "^2.1.1"
-      }
-    },
     "tree-kill": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/tree-kill/-/tree-kill-1.2.2.tgz",
@@ -2638,14 +1711,6 @@
       "integrity": "sha512-d6xOpEDfsi2CZVlPQzGeux8XMwLT9hssAsaPYExaQMuYskwb+x1x7J371tWlbBdWHroy99KnVB6qIkUbs5X3UQ==",
       "dev": true
     },
-    "type-check": {
-      "version": "0.3.2",
-      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
-      "integrity": "sha512-ZCmOJdvOWDBYJlzAoFkC+Q0+bUyEOS1ltgp1MGU03fqHG+dbi9tBFU2Rd9QKiDZFAYrhPh2JUf7rZRIuHRKtOg==",
-      "requires": {
-        "prelude-ls": "~1.1.2"
-      }
-    },
     "typescript": {
       "version": "4.7.4",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.7.4.tgz",
@@ -2661,66 +1726,21 @@
         "qs": "^6.4.0"
       }
     },
-    "universalify": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.2.0.tgz",
-      "integrity": "sha512-CJ1QgKmNg3CwvAv/kOFmtnEN05f0D/cn9QntgNOQlQF9dgvVTHj3t+8JPdjqawCHk7V/KA+fbUqzZ9XWhcqPUg=="
-    },
     "url-join": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/url-join/-/url-join-4.0.1.tgz",
       "integrity": "sha512-jk1+QP6ZJqyOiuEI9AEWQfju/nB2Pw466kbA0LEZljHwKeMgd9WrAEgEGxjPDD2+TNbbb37rTyhEfrCXfuKXnA==",
       "dev": true
     },
-    "url-parse": {
-      "version": "1.5.10",
-      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.5.10.tgz",
-      "integrity": "sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==",
-      "requires": {
-        "querystringify": "^2.1.1",
-        "requires-port": "^1.0.0"
-      }
-    },
-    "w3c-xmlserializer": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-4.0.0.tgz",
-      "integrity": "sha512-d+BFHzbiCx6zGfz0HyQ6Rg69w9k19nviJspaj4yNscGjrHu94sVP+aRm75yEbCh+r2/yR+7q6hux9LVtbuTGBw==",
-      "requires": {
-        "xml-name-validator": "^4.0.0"
-      }
-    },
-    "webidl-conversions": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
-      "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g=="
-    },
     "whatwg-encoding": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-2.0.0.tgz",
       "integrity": "sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==",
+      "dev": true,
       "requires": {
         "iconv-lite": "0.6.3"
       }
     },
-    "whatwg-mimetype": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
-      "integrity": "sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q=="
-    },
-    "whatwg-url": {
-      "version": "11.0.0",
-      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-11.0.0.tgz",
-      "integrity": "sha512-RKT8HExMpoYx4igMiVMY83lN6UeITKJlBQ+vR/8ZJ8OCdSiN3RwCq+9gH0+Xzj0+5IrM6i4j/6LuvzbZIQgEcQ==",
-      "requires": {
-        "tr46": "^3.0.0",
-        "webidl-conversions": "^7.0.0"
-      }
-    },
-    "word-wrap": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
-      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ=="
-    },
     "wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
@@ -2732,22 +1752,6 @@
         "strip-ansi": "^6.0.0"
       }
     },
-    "ws": {
-      "version": "8.13.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-8.13.0.tgz",
-      "integrity": "sha512-x9vcZYTrFPC7aSIbj7sRCYo7L/Xb8Iy+pW0ng0wt2vCJv7M9HOMy0UoN3rr+IFC7hb7vXoqS+P9ktyLLLhO+LA==",
-      "requires": {}
-    },
-    "xml-name-validator": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-4.0.0.tgz",
-      "integrity": "sha512-ICP2e+jsHvAj2E2lIHxa5tjXRlKDJo4IdvPvCXbXQGdzSfmSpNVyIKMvoZHjDY9DP0zV17iI85o90vRFXNccRw=="
-    },
-    "xmlchars": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
-      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw=="
-    },
     "y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
diff --git a/demo/package.json b/demo/package.json
index 3acd24f8..6fc2d3d2 100644
--- a/demo/package.json
+++ b/demo/package.json
@@ -4,8 +4,12 @@
   "description": "A demo app for BudouX",
   "main": "static/app.js",
   "scripts": {
-    "build": "esbuild src/app.ts --bundle --minify --outfile=static/app.js",
-    "watch": "esbuild src/app.ts --watch --bundle --minify --outfile=static/app.js",
+    "build:app": "esbuild src/app.ts --bundle --minify --outfile=static/app.js",
+    "build:worker": "esbuild src/worker.ts --bundle --minify --outfile=static/worker.js",
+    "build": "npm run build:app && npm run build:worker",
+    "watch:app": "esbuild src/app.ts --watch --bundle --minify --outfile=static/app.js",
+    "watch:worker": "esbuild src/worker.ts --watch --bundle --minify --outfile=static/worker.js",
+    "watch": "concurrently \"npm run watch:app\" \"npm run watch:worker\"",
     "serve": "http-server static",
     "dev": "concurrently \"npm run serve\" \"npm run watch\"",
     "start": "npm run dev"
diff --git a/demo/src/app.ts b/demo/src/app.ts
index d45f2009..339665f2 100644
--- a/demo/src/app.ts
+++ b/demo/src/app.ts
@@ -32,7 +32,10 @@ const fontSizeElement = document.getElementById('fontsize') as HTMLInputElement;
 const brCheckElement = document.getElementById('wbr2br') as HTMLInputElement;
 const modelSelectElement = document.getElementById('model') as HTMLSelectElement;
 const url = new URL(document.location.href);
-
+const worker = new Worker('./worker.js');
+worker.onmessage = (e: MessageEvent) => {
+  console.log('response from worker:', e);
+};
 
 declare global {
   interface Window {
@@ -48,6 +51,7 @@ declare global {
 const run = () => {
   outputContainerElement.innerHTML = window.DOMPurify.sanitize(inputTextElement.value);
   const model = modelSelectElement.value;
+  worker.postMessage({'sentence': outputContainerElement.textContent, 'model': model});
   const parser = parsers.get(model);
   if (!parser) return;
   parser.applyElement(outputContainerElement);
diff --git a/demo/src/worker.ts b/demo/src/worker.ts
new file mode 100644
index 00000000..5d551fc5
--- /dev/null
+++ b/demo/src/worker.ts
@@ -0,0 +1,32 @@
+/**
+ * @license
+ * Copyright 2023 Google LLC
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Parser, jaModel, zhHansModel, zhHantModel } from 'budoux';
+
+const parsers: { [key: string]: Parser } = {
+  'ja': new Parser(jaModel),
+  'zh-hans': new Parser(zhHansModel),
+  'zh-hant': new Parser(zhHantModel),
+};
+
+onmessage = (e: MessageEvent) => {
+  const model: string = e.data['model'];
+  if (!Object.keys(parsers).includes(model)) return;
+  const parser = parsers[model];
+  const result = parser.parse(e.data['sentence']);
+  console.log('It works in Web Worker, too!', result);
+  postMessage(result);
+};
diff --git a/javascript/package.json b/javascript/package.json
index fdb77b40..debb5511 100644
--- a/javascript/package.json
+++ b/javascript/package.json
@@ -12,6 +12,10 @@
   "bin": {
     "budoux": "./bin/budoux.js"
   },
+  "sideEffects": [
+    "./module/webcomponents/*",
+    "./module/tests/*"
+  ],
   "scripts": {
     "build": "npm run build:es && npm run build:cjs",
     "build:cjs": "tsc && cp -r src/tests/models/ dist/tests/models/",
diff --git a/javascript/src/cli.ts b/javascript/src/cli.ts
index c079e51b..f0c5e0c9 100644
--- a/javascript/src/cli.ts
+++ b/javascript/src/cli.ts
@@ -19,10 +19,10 @@ import * as path from 'path';
 import * as readline from 'readline';
 import {Command} from 'commander';
 import {
-  Parser,
+  HTMLProcessingParser,
   loadDefaultParsers,
   loadDefaultJapaneseParser,
-} from './parser.js';
+} from './index.js';
 
 const CLI_VERSION = '0.5.1';
 const defaultParsers = loadDefaultParsers();
@@ -104,7 +104,7 @@ export const cli = (argv: string[]) => {
  * @param args string array to parse. Array should have only one element.
  */
 const outputParsedTexts = (
-  parser: Parser,
+  parser: HTMLProcessingParser,
   html: boolean,
   delim: string,
   args: string[]
@@ -134,5 +134,5 @@ const outputParsedTexts = (
 const loadCustomParser = (modelPath: string) => {
   const file = readFileSync(path.resolve(modelPath)).toString();
   const model = JSON.parse(file);
-  return new Parser(model);
+  return new HTMLProcessingParser(model);
 };
diff --git a/javascript/src/html_processor.ts b/javascript/src/html_processor.ts
index 34c66b2d..df24d361 100644
--- a/javascript/src/html_processor.ts
+++ b/javascript/src/html_processor.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {applyWrapStyle} from './dom.js';
+import {applyWrapStyle, parseFromString} from './dom.js';
 import {Parser} from './parser.js';
 import {win} from './win.js';
 
@@ -222,16 +222,7 @@ export interface HTMLProcessorOptions {
 }
 
 /**
- * Applies the BudouX to the given DOM.
- *
- * This class has following advantages over
- * {@link Parser.applyElement}.
- * * It recognizes paragraphs and applies the BudouX for each
- *   paragraph separately.
- * * It can customize how to insert break opportunities.
- *   See {@link separator} for more details.
- * * It is generally faster and more memory efficient, but the
- *   code size is larger.
+ * Adds HTML processing support to a BudouX {@link Parser}.
  */
 export class HTMLProcessor {
   private parser_: Parser;
@@ -457,3 +448,49 @@ export class HTMLProcessor {
     applyWrapStyle(element);
   }
 }
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type Constructor<T = {}> = new (...args: any[]) => T;
+
+/**
+ * Mixin to add HTML processing support to {@link Parser}.
+ * @param Base A base {@link Parser} class
+ * @returns An extended {@link Parser} class with {@link HTMLProcessor}.
+ */
+function HTMLProcessing<TBase extends Constructor<Parser>>(Base: TBase) {
+  return class _HTMLProcessable extends Base {
+    /**
+     * Applies markups for semantic line breaks to the given HTML element.
+     * @param parentElement The input element.
+     */
+    applyElement(parentElement: HTMLElement) {
+      const htmlProcessor = new HTMLProcessor(this, {
+        separator: parentElement.ownerDocument.createElement('wbr'),
+      });
+      htmlProcessor.applyToElement(parentElement);
+    }
+
+    /**
+     * Translates the given HTML string to another HTML string with markups
+     * for semantic line breaks.
+     * @param html An input html string.
+     * @returns The translated HTML string.
+     */
+    translateHTMLString(html: string) {
+      if (html === '') return html;
+      const doc = parseFromString(html);
+      if (Parser.hasChildTextNode(doc.body)) {
+        const wrapper = doc.createElement('span');
+        wrapper.append(...doc.body.childNodes);
+        doc.body.append(wrapper);
+      }
+      this.applyElement(doc.body.childNodes[0] as HTMLElement);
+      return doc.body.innerHTML;
+    }
+  };
+}
+
+/**
+ * BudouX {@link Parser} with HTML processing support.
+ */
+export class HTMLProcessingParser extends HTMLProcessing(Parser) {}
diff --git a/javascript/src/index.ts b/javascript/src/index.ts
index 824c7955..8f4081e4 100644
--- a/javascript/src/index.ts
+++ b/javascript/src/index.ts
@@ -14,5 +14,47 @@
  * limitations under the License.
  */
 
-export * from './parser.js';
-export {HTMLProcessor} from './html_processor.js';
+import {model as jaModel} from './data/models/ja.js';
+import {model as zhHansModel} from './data/models/zh-hans.js';
+import {model as zhHantModel} from './data/models/zh-hant.js';
+import {HTMLProcessingParser} from './html_processor.js';
+
+export {Parser} from './parser.js';
+export {HTMLProcessor, HTMLProcessingParser} from './html_processor.js';
+export {jaModel, zhHansModel, zhHantModel};
+
+/**
+ * Loads a parser equipped with the default Japanese model.
+ * @returns A parser with the default Japanese model.
+ */
+export const loadDefaultJapaneseParser = () => {
+  return new HTMLProcessingParser(jaModel);
+};
+
+/**
+ * Loads a parser equipped with the default Simplified Chinese model.
+ * @returns A parser with the default Simplified Chinese model.
+ */
+export const loadDefaultSimplifiedChineseParser = () => {
+  return new HTMLProcessingParser(zhHansModel);
+};
+
+/**
+ * Loads a parser equipped with the default Traditional Chinese model.
+ * @returns A parser with the default Traditional Chinese model.
+ */
+export const loadDefaultTraditionalChineseParser = () => {
+  return new HTMLProcessingParser(zhHantModel);
+};
+
+/**
+ * Loads available default parsers.
+ * @returns A map between available lang codes and their default parsers.
+ */
+export const loadDefaultParsers = () => {
+  return new Map([
+    ['ja', loadDefaultJapaneseParser()],
+    ['zh-hans', loadDefaultSimplifiedChineseParser()],
+    ['zh-hant', loadDefaultTraditionalChineseParser()],
+  ]);
+};
diff --git a/javascript/src/parser.ts b/javascript/src/parser.ts
index 94140436..4825e5f6 100644
--- a/javascript/src/parser.ts
+++ b/javascript/src/parser.ts
@@ -14,11 +14,6 @@
  * limitations under the License.
  */
 
-import {model as jaModel} from './data/models/ja.js';
-import {model as zhHansModel} from './data/models/zh-hans.js';
-import {model as zhHantModel} from './data/models/zh-hant.js';
-import {parseFromString} from './dom.js';
-import {HTMLProcessor} from './html_processor.js';
 import {sum} from './utils.js';
 
 // We could use `Node.TEXT_NODE` and `Node.ELEMENT_NODE` in a browser context,
@@ -28,9 +23,17 @@ const NODETYPE = {
   TEXT: 3,
 };
 
+/**
+ * Base BudouX parser.
+ */
 export class Parser {
+  /** BudouX model data */
   model;
 
+  /**
+   * Constructs a BudouX parser.
+   * @param model A model data.
+   */
   constructor(model: {[key: string]: {[key: string]: number}}) {
     this.model = new Map(
       Object.entries(model).map(([k, v]) => [k, new Map(Object.entries(v))])
@@ -83,69 +86,4 @@ export class Parser {
     }
     return result;
   }
-
-  /**
-   * Applies markups for semantic line breaks to the given HTML element.
-   * @param parentElement The input element.
-   */
-  applyElement(parentElement: HTMLElement) {
-    const htmlProcessor = new HTMLProcessor(this, {
-      separator: parentElement.ownerDocument.createElement('wbr'),
-    });
-    htmlProcessor.applyToElement(parentElement);
-  }
-
-  /**
-   * Translates the given HTML string to another HTML string with markups
-   * for semantic line breaks.
-   * @param html An input html string.
-   * @returns The translated HTML string.
-   */
-  translateHTMLString(html: string) {
-    if (html === '') return html;
-    const doc = parseFromString(html);
-    if (Parser.hasChildTextNode(doc.body)) {
-      const wrapper = doc.createElement('span');
-      wrapper.append(...doc.body.childNodes);
-      doc.body.append(wrapper);
-    }
-    this.applyElement(doc.body.childNodes[0] as HTMLElement);
-    return doc.body.innerHTML;
-  }
 }
-
-/**
- * Loads a parser equipped with the default Japanese model.
- * @returns A parser with the default Japanese model.
- */
-export const loadDefaultJapaneseParser = () => {
-  return new Parser(jaModel);
-};
-
-/**
- * Loads a parser equipped with the default Simplified Chinese model.
- * @returns A parser with the default Simplified Chinese model.
- */
-export const loadDefaultSimplifiedChineseParser = () => {
-  return new Parser(zhHansModel);
-};
-
-/**
- * Loads a parser equipped with the default Traditional Chinese model.
- * @returns A parser with the default Traditional Chinese model.
- */
-export const loadDefaultTraditionalChineseParser = () => {
-  return new Parser(zhHantModel);
-};
-
-/**
- * Loads available default parsers.
- * @returns A map between available lang codes and their default parsers.
- */
-export const loadDefaultParsers = () => {
-  return new Map([
-    ['ja', loadDefaultJapaneseParser()],
-    ['zh-hans', loadDefaultSimplifiedChineseParser()],
-    ['zh-hant', loadDefaultTraditionalChineseParser()],
-  ]);
-};
diff --git a/javascript/src/tests/test_cli.ts b/javascript/src/tests/test_cli.ts
index ffbc576f..0d106d22 100644
--- a/javascript/src/tests/test_cli.ts
+++ b/javascript/src/tests/test_cli.ts
@@ -18,7 +18,7 @@ import {cli} from '../cli.js';
 import {execFile, ExecFileException} from 'child_process';
 import * as path from 'path';
 import stream from 'stream';
-import {loadDefaultParsers} from '../parser.js';
+import {loadDefaultParsers} from '../index.js';
 
 type execFileCallBack = {
   error: ExecFileException | null;
diff --git a/javascript/src/tests/test_html_processor.ts b/javascript/src/tests/test_html_processor.ts
index b7dbced8..b01019b6 100644
--- a/javascript/src/tests/test_html_processor.ts
+++ b/javascript/src/tests/test_html_processor.ts
@@ -14,10 +14,14 @@
  * limitations under the License.
  */
 
-import {loadDefaultJapaneseParser} from '../parser.js';
-import {HTMLProcessor, HTMLProcessorOptions} from '../html_processor.js';
+import {loadDefaultJapaneseParser} from '../index.js';
+import {
+  HTMLProcessingParser,
+  HTMLProcessor,
+  HTMLProcessorOptions,
+} from '../html_processor.js';
 import {win} from '../win.js';
-import {setInnerHtml} from '../dom.js';
+import {parseFromString, setInnerHtml} from '../dom.js';
 
 const parser = loadDefaultJapaneseParser();
 
@@ -274,3 +278,119 @@ describe('HTMLProcessor.splitTextNodes', () => {
     ]);
   });
 });
+
+describe('HTMLProcessingParser.applyElement', () => {
+  const checkEqual = (
+    model: {[key: string]: {[key: string]: number}},
+    inputHTML: string,
+    expectedHTML: string
+  ) => {
+    const inputDOM = parseFromString(inputHTML);
+    const inputDocument = inputDOM.querySelector('p') as HTMLElement;
+    const parser = new HTMLProcessingParser(model);
+    parser.applyElement(inputDocument);
+    const expectedDocument = parseFromString(expectedHTML);
+    const expectedElement = expectedDocument.querySelector('p') as HTMLElement;
+    expect(inputDocument.isEqualNode(expectedElement)).toBeTrue();
+  };
+
+  it('should insert WBR tags where the sentence should break.', () => {
+    const inputHTML = '<p>xyzabcabc</p>';
+    const expectedHTML = `
+    <p style="word-break: keep-all; overflow-wrap: anywhere;"
+    >xyz<wbr>abc<wbr>abc</p>`;
+    const model = {
+      UW4: {a: 1001}, // means "should separate right before 'a'".
+    };
+    checkEqual(model, inputHTML, expectedHTML);
+  });
+
+  it('should insert WBR tags even it overlaps with other HTML tags.', () => {
+    const inputHTML = '<p>xy<a href="#">zabca</a>bc</p>';
+    const expectedHTML = `<p style="word-break: keep-all; overflow-wrap: anywhere;"
+    >xy<a href="#">z<wbr>abc<wbr>a</a>bc</p>`;
+    const model = {
+      UW4: {a: 1001}, // means "should separate right before 'a'".
+    };
+    checkEqual(model, inputHTML, expectedHTML);
+  });
+});
+
+describe('HTMLProcessingParser.translateHTMLString', () => {
+  const defaultModel = {
+    UW4: {a: 1001}, // means "should separate right before 'a'".
+  };
+  const checkEqual = (
+    model: {[key: string]: {[key: string]: number}},
+    inputHTML: string,
+    expectedHTML: string
+  ) => {
+    const parser = new HTMLProcessingParser(model);
+    const result = parser.translateHTMLString(inputHTML);
+    const resultDocument = parseFromString(result);
+    const expectedDocument = parseFromString(expectedHTML);
+    expect(resultDocument.isEqualNode(expectedDocument)).toBeTrue();
+  };
+
+  it('should output a html string with a SPAN parent with proper style attributes.', () => {
+    const inputHTML = 'xyzabcd';
+    const expectedHTML = `
+    <span style="word-break: keep-all; overflow-wrap: anywhere;">xyz<wbr>abcd</span>`;
+    checkEqual(defaultModel, inputHTML, expectedHTML);
+  });
+
+  it('should not add a SPAN parent if the input already has one single parent.', () => {
+    const inputHTML = '<p class="foo" style="color: red">xyzabcd</p>';
+    const expectedHTML = `
+    <p class="foo"
+       style="color: red; word-break: keep-all; overflow-wrap: anywhere;"
+    >xyz<wbr>abcd</p>`;
+    checkEqual(defaultModel, inputHTML, expectedHTML);
+  });
+
+  it('should return a blank string if the input is blank.', () => {
+    const inputHTML = '';
+    const expectedHTML = '';
+    checkEqual({}, inputHTML, expectedHTML);
+  });
+
+  it('should pass script tags as-is.', () => {
+    const inputHTML = 'xyz<script>alert(1);</script>xyzabc';
+    const expectedHTML = `<span
+    style="word-break: keep-all; overflow-wrap: anywhere;"
+    >xyz<script>alert(1);</script>xyz<wbr>abc</span>`;
+    checkEqual(defaultModel, inputHTML, expectedHTML);
+  });
+
+  it('script tags on top should be discarded by the DOMParser.', () => {
+    const inputHTML = '<script>alert(1);</script>xyzabc';
+    const expectedHTML = `<span
+    style="word-break: keep-all; overflow-wrap: anywhere;"
+    >xyz<wbr>abc</span>`;
+    checkEqual(defaultModel, inputHTML, expectedHTML);
+  });
+
+  it('should skip some specific tags.', () => {
+    const inputHTML = 'xyz<code>abc</code>abc';
+    const expectedHTML = `<span
+    style="word-break: keep-all; overflow-wrap: anywhere;"
+    >xyz<code>abc</code><wbr>abc</span>`;
+    checkEqual(defaultModel, inputHTML, expectedHTML);
+  });
+
+  it('should not ruin attributes of child elements.', () => {
+    const inputHTML = 'xyza<a href="#" hidden>bc</a>abc';
+    const expectedHTML = `<span
+    style="word-break: keep-all; overflow-wrap: anywhere;"
+    >xyz<wbr>a<a href="#" hidden>bc</a><wbr>abc</span>`;
+    checkEqual(defaultModel, inputHTML, expectedHTML);
+  });
+
+  it('should work with emojis.', () => {
+    const inputHTML = 'xyza🇯🇵🇵🇹abc';
+    const expectedHTML = `<span
+    style="word-break: keep-all; overflow-wrap: anywhere;"
+    >xyz<wbr>a🇯🇵🇵🇹<wbr>abc</span>`;
+    checkEqual(defaultModel, inputHTML, expectedHTML);
+  });
+});
diff --git a/javascript/src/tests/test_parser.ts b/javascript/src/tests/test_parser.ts
index c4f1395d..6883cd70 100644
--- a/javascript/src/tests/test_parser.ts
+++ b/javascript/src/tests/test_parser.ts
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-import {parseFromString} from '../dom.js';
 import {Parser} from '../parser.js';
 
 describe('Parser.parse', () => {
@@ -44,119 +43,3 @@ describe('Parser.parse', () => {
     expect(result).toEqual([]);
   });
 });
-
-describe('Parser.applyElement', () => {
-  const checkEqual = (
-    model: {[key: string]: {[key: string]: number}},
-    inputHTML: string,
-    expectedHTML: string
-  ) => {
-    const inputDOM = parseFromString(inputHTML);
-    const inputDocument = inputDOM.querySelector('p') as HTMLElement;
-    const parser = new Parser(model);
-    parser.applyElement(inputDocument);
-    const expectedDocument = parseFromString(expectedHTML);
-    const expectedElement = expectedDocument.querySelector('p') as HTMLElement;
-    expect(inputDocument.isEqualNode(expectedElement)).toBeTrue();
-  };
-
-  it('should insert WBR tags where the sentence should break.', () => {
-    const inputHTML = '<p>xyzabcabc</p>';
-    const expectedHTML = `
-    <p style="word-break: keep-all; overflow-wrap: anywhere;"
-    >xyz<wbr>abc<wbr>abc</p>`;
-    const model = {
-      UW4: {a: 1001}, // means "should separate right before 'a'".
-    };
-    checkEqual(model, inputHTML, expectedHTML);
-  });
-
-  it('should insert WBR tags even it overlaps with other HTML tags.', () => {
-    const inputHTML = '<p>xy<a href="#">zabca</a>bc</p>';
-    const expectedHTML = `<p style="word-break: keep-all; overflow-wrap: anywhere;"
-    >xy<a href="#">z<wbr>abc<wbr>a</a>bc</p>`;
-    const model = {
-      UW4: {a: 1001}, // means "should separate right before 'a'".
-    };
-    checkEqual(model, inputHTML, expectedHTML);
-  });
-});
-
-describe('Parser.translateHTMLString', () => {
-  const defaultModel = {
-    UW4: {a: 1001}, // means "should separate right before 'a'".
-  };
-  const checkEqual = (
-    model: {[key: string]: {[key: string]: number}},
-    inputHTML: string,
-    expectedHTML: string
-  ) => {
-    const parser = new Parser(model);
-    const result = parser.translateHTMLString(inputHTML);
-    const resultDocument = parseFromString(result);
-    const expectedDocument = parseFromString(expectedHTML);
-    expect(resultDocument.isEqualNode(expectedDocument)).toBeTrue();
-  };
-
-  it('should output a html string with a SPAN parent with proper style attributes.', () => {
-    const inputHTML = 'xyzabcd';
-    const expectedHTML = `
-    <span style="word-break: keep-all; overflow-wrap: anywhere;">xyz<wbr>abcd</span>`;
-    checkEqual(defaultModel, inputHTML, expectedHTML);
-  });
-
-  it('should not add a SPAN parent if the input already has one single parent.', () => {
-    const inputHTML = '<p class="foo" style="color: red">xyzabcd</p>';
-    const expectedHTML = `
-    <p class="foo"
-       style="color: red; word-break: keep-all; overflow-wrap: anywhere;"
-    >xyz<wbr>abcd</p>`;
-    checkEqual(defaultModel, inputHTML, expectedHTML);
-  });
-
-  it('should return a blank string if the input is blank.', () => {
-    const inputHTML = '';
-    const expectedHTML = '';
-    checkEqual({}, inputHTML, expectedHTML);
-  });
-
-  it('should pass script tags as-is.', () => {
-    const inputHTML = 'xyz<script>alert(1);</script>xyzabc';
-    const expectedHTML = `<span
-    style="word-break: keep-all; overflow-wrap: anywhere;"
-    >xyz<script>alert(1);</script>xyz<wbr>abc</span>`;
-    checkEqual(defaultModel, inputHTML, expectedHTML);
-  });
-
-  it('script tags on top should be discarded by the DOMParser.', () => {
-    const inputHTML = '<script>alert(1);</script>xyzabc';
-    const expectedHTML = `<span
-    style="word-break: keep-all; overflow-wrap: anywhere;"
-    >xyz<wbr>abc</span>`;
-    checkEqual(defaultModel, inputHTML, expectedHTML);
-  });
-
-  it('should skip some specific tags.', () => {
-    const inputHTML = 'xyz<code>abc</code>abc';
-    const expectedHTML = `<span
-    style="word-break: keep-all; overflow-wrap: anywhere;"
-    >xyz<code>abc</code><wbr>abc</span>`;
-    checkEqual(defaultModel, inputHTML, expectedHTML);
-  });
-
-  it('should not ruin attributes of child elements.', () => {
-    const inputHTML = 'xyza<a href="#" hidden>bc</a>abc';
-    const expectedHTML = `<span
-    style="word-break: keep-all; overflow-wrap: anywhere;"
-    >xyz<wbr>a<a href="#" hidden>bc</a><wbr>abc</span>`;
-    checkEqual(defaultModel, inputHTML, expectedHTML);
-  });
-
-  it('should work with emojis.', () => {
-    const inputHTML = 'xyza🇯🇵🇵🇹abc';
-    const expectedHTML = `<span
-    style="word-break: keep-all; overflow-wrap: anywhere;"
-    >xyz<wbr>a🇯🇵🇵🇹<wbr>abc</span>`;
-    checkEqual(defaultModel, inputHTML, expectedHTML);
-  });
-});
diff --git a/javascript/src/tests/test_webcomponents.ts b/javascript/src/tests/test_webcomponents.ts
index bef9629d..b1123695 100644
--- a/javascript/src/tests/test_webcomponents.ts
+++ b/javascript/src/tests/test_webcomponents.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {loadDefaultJapaneseParser} from '../parser.js';
+import {loadDefaultJapaneseParser} from '../index.js';
 import '../webcomponents/budoux-ja.js';
 
 const parser = loadDefaultJapaneseParser();
diff --git a/javascript/src/webcomponents/budoux-base.ts b/javascript/src/webcomponents/budoux-base.ts
index ab2931f8..0d00acd1 100644
--- a/javascript/src/webcomponents/budoux-base.ts
+++ b/javascript/src/webcomponents/budoux-base.ts
@@ -15,14 +15,14 @@
  */
 
 import {setInnerHtml} from '../dom.js';
-import {Parser} from '../parser.js';
+import {HTMLProcessingParser} from '../html_processor.js';
 
 /**
  * Base BudouX Web component.
  */
 export abstract class BudouXBaseElement extends HTMLElement {
   shadow: ShadowRoot;
-  parser: Parser;
+  parser: HTMLProcessingParser;
 
   /**
    * Base BudouX Web component constructor.
@@ -30,7 +30,7 @@ export abstract class BudouXBaseElement extends HTMLElement {
   constructor() {
     super();
 
-    this.parser = new Parser({});
+    this.parser = new HTMLProcessingParser({});
     this.shadow = this.attachShadow({mode: 'open'});
     const observer = new MutationObserver(this.sync.bind(this));
     observer.observe(this, {
diff --git a/javascript/src/webcomponents/budoux-ja.ts b/javascript/src/webcomponents/budoux-ja.ts
index d643849d..5b25762d 100644
--- a/javascript/src/webcomponents/budoux-ja.ts
+++ b/javascript/src/webcomponents/budoux-ja.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {loadDefaultJapaneseParser} from '../parser.js';
+import {loadDefaultJapaneseParser} from '../index.js';
 import {BudouXBaseElement} from './budoux-base.js';
 
 /**
diff --git a/javascript/src/webcomponents/budoux-zh-hans.ts b/javascript/src/webcomponents/budoux-zh-hans.ts
index 6e486e56..7dd8933e 100644
--- a/javascript/src/webcomponents/budoux-zh-hans.ts
+++ b/javascript/src/webcomponents/budoux-zh-hans.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {loadDefaultSimplifiedChineseParser} from '../parser.js';
+import {loadDefaultSimplifiedChineseParser} from '../index.js';
 import {BudouXBaseElement} from './budoux-base.js';
 
 /**
diff --git a/javascript/src/webcomponents/budoux-zh-hant.ts b/javascript/src/webcomponents/budoux-zh-hant.ts
index 4671976b..57756215 100644
--- a/javascript/src/webcomponents/budoux-zh-hant.ts
+++ b/javascript/src/webcomponents/budoux-zh-hant.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {loadDefaultTraditionalChineseParser} from '../parser.js';
+import {loadDefaultTraditionalChineseParser} from '../index.js';
 import {BudouXBaseElement} from './budoux-base.js';
 
 /**