diff --git a/package.json b/package.json
index 4273c6f9..bf65cf00 100644
--- a/package.json
+++ b/package.json
@@ -77,7 +77,6 @@
     "node-gyp": "^8.4.1",
     "npm": "^6.13.4",
     "oracledb": "^4.2.0",
-    "param-case": "^3.0.4",
     "passport": "^0.5.2",
     "passport-google-oauth": "^2.0.0",
     "path-platform": "^0.11.15",
@@ -101,6 +100,7 @@
     "the-answer": "^1.0.0",
     "tiny-json-http": "^7.0.2",
     "ts-loader": "^8.3.0",
+    "tsconfck": "^1.2.2",
     "tsconfig-paths": "^3.7.0",
     "tsconfig-paths-webpack-plugin": "^3.2.0",
     "twilio": "^3.23.2",
diff --git a/src/cli.js b/src/cli.js
index 3c335377..9bbbf7de 100755
--- a/src/cli.js
+++ b/src/cli.js
@@ -346,8 +346,9 @@ async function runCmd (argv, stdout, stderr) {
         }
       }
       if (args["--watch"]) {
-        ncc.handler(handler);
-        ncc.rebuild(() => {
+        const nccWithWatchOption = await ncc
+        nccWithWatchOption.handler(handler);
+        nccWithWatchOption.rebuild(() => {
           if (ps)
             ps.kill();
           startTime = Date.now();
diff --git a/src/index.js b/src/index.js
index 5d05a54d..c3bf8af7 100644
--- a/src/index.js
+++ b/src/index.js
@@ -32,7 +32,7 @@ const defaultPermissions = 0o666;
 const relocateLoader = eval('require(__dirname + "/loaders/relocate-loader.js")');
 
 module.exports = ncc;
-function ncc (
+async function ncc (
   entry,
   {
     cache,
@@ -109,7 +109,7 @@ function ncc (
     existingAssetNames.push(`${filename}.cache`);
     existingAssetNames.push(`${filename}.cache${ext}`);
   }
-  const compilerOptions = loadTsconfigOptions(tsconfigPath, {
+  const fullTsconfig = await loadTsconfigOptions(tsconfigPath, {
     base: process.cwd(),
     start: dirname(entry),
     filename: 'tsconfig.json'
@@ -120,7 +120,7 @@ function ncc (
   // error if there's no tsconfig in the working directory
   try {
     const tsconfigPathsOptions = { silent: true }
-    if (compilerOptions.allowJs) {
+    if (fullTsconfig.compilerOptions.allowJs) {
       tsconfigPathsOptions.extensions = SUPPORTED_EXTENSIONS
     }
     resolvePlugins.push(new TsconfigPathsPlugin(tsconfigPathsOptions));
@@ -357,7 +357,7 @@ function ncc (
               compilerOptions: {
                 module: 'esnext',
                 target: 'esnext',
-                ...compilerOptions,
+                ...fullTsconfig.compilerOptions,
                 allowSyntheticDefaultImports: true,
                 noEmit: false,
                 outDir: '//'
@@ -448,7 +448,7 @@ function ncc (
 
   async function finalizeHandler (stats) {
     const assets = Object.create(null);
-    getFlatFiles(mfs.data, assets, relocateLoader.getAssetMeta, compilerOptions);
+    getFlatFiles(mfs.data, assets, relocateLoader.getAssetMeta, fullTsconfig);
     // filter symlinks to existing assets
     const symlinks = Object.create(null);
     for (const [key, value] of Object.entries(relocateLoader.getSymlinks())) {
@@ -642,17 +642,17 @@ function ncc (
 }
 
 // this could be rewritten with actual FS apis / globs, but this is simpler
-function getFlatFiles(mfsData, output, getAssetMeta, tsconfigCompilerOptions, curBase = "") {
+function getFlatFiles(mfsData, output, getAssetMeta, tsconfig, curBase = "") {
   for (const path of Object.keys(mfsData)) {
     const item = mfsData[path];
     let curPath = `${curBase}/${path}`;
     // directory
-    if (item[""] === true) getFlatFiles(item, output, getAssetMeta, tsconfigCompilerOptions, curPath);
+    if (item[""] === true) getFlatFiles(item, output, getAssetMeta, tsconfig, curPath);
     // file
     else if (!curPath.endsWith("/")) {
       const meta = getAssetMeta(curPath.slice(1)) || {};
       if(curPath.endsWith(".d.ts")) {
-        const outDir = tsconfigCompilerOptions.outDir ? pathResolve(tsconfigCompilerOptions.outDir) : pathResolve('dist');
+        const outDir = tsconfig.compilerOptions.outDir ? pathResolve(tsconfig.compilerOptions.outDir) : pathResolve('dist');
         curPath = curPath
           .replace(outDir, "")
           .replace(process.cwd(), "")
diff --git a/src/utils/load-tsconfig-options.js b/src/utils/load-tsconfig-options.js
index 3d1b43f9..e7a997b2 100644
--- a/src/utils/load-tsconfig-options.js
+++ b/src/utils/load-tsconfig-options.js
@@ -1,7 +1,10 @@
-const ts = require('typescript');
 const { join, dirname, resolve } = require('path');
 const fs = require('fs');
-const { paramCase } = require('param-case');
+const { parse } = require('tsconfck');
+
+const DEFAULT_TSCONFIG_OPTIONS = {
+  compilerOptions: {}
+};
 
 /**
  * @typedef {object} LoadTsconfigInit
@@ -31,107 +34,22 @@ function walkParentDirs({ base, start, filename }) {
   return null;
 }
 
-/**
- * @param {ts.CompilerOptions} options
- * @param {string | undefined} key
- * @param {(value: string) => string} [callback]
- * @returns {string | undefined}
- */
-function convertEnumCompilerOptions(enumCompilerOptions, key, callback) {
-  if (key == null) {
-    return undefined;
-  }
-  const value = enumCompilerOptions[key];
-  return typeof callback === 'function' ? callback(value) : value;
-}
-
-/**
- * @param {string} value
- * @returns {string}
- */
-function toLowerCase(value) {
-  return value.toLowerCase();
-}
-
-/**
- * @param {ts.NewLineKind} newLine
- * @returns {string | undefined}
- */
-function normalizeNewLineOption(newLine) {
-  switch (newLine) {
-    case ts.NewLineKind.CarriageReturnLineFeed:
-      return 'crlf';
-    case ts.NewLineKind.LineFeed:
-      return 'lf';
-    default:
-      return undefined;
-  }
-}
-
-/**
- * @param {ts.ModuleResolutionKind} moduleResolution
- * @returns {string | undefined}
- */
-function normalizeModuleResolutionOption(moduleResolution) {
-  switch (moduleResolution) {
-    case ts.ModuleResolutionKind.Classic:
-      return 'classic';
-    case ts.ModuleResolutionKind.NodeJs:
-      return 'node';
-    case ts.ModuleResolutionKind.Node12:
-      return 'node12';
-    case ts.ModuleResolutionKind.NodeNext:
-      return 'nodenext';
-    default:
-      return undefined;
-  }
-}
-
-/**
- * @param {ts.CompilerOptions} options
- * @returns {ts.CompilerOptions}
- */
-function normalizeCompilerOptions(options) {
-  if (options.importsNotUsedAsValues != null) {
-    options.importsNotUsedAsValues = convertEnumCompilerOptions(
-      ts.ImportsNotUsedAsValues,
-      options.importsNotUsedAsValues,
-      toLowerCase,
-    );
-  }
-  if (options.jsx != null) {
-    options.jsx = convertEnumCompilerOptions(ts.JsxEmit, options.jsx, paramCase);
-  }
-  if (options.module != null) {
-    options.module = convertEnumCompilerOptions(ts.ModuleKind, options.module, toLowerCase);
-  }
-  if (options.moduleResolution != null) {
-    options.moduleResolution = normalizeModuleResolutionOption(options.moduleResolution);
-  }
-  if (options.newLine != null) {
-    options.newLine = normalizeNewLineOption(options.newLine);
-  }
-  if (options.target != null) {
-    options.target = convertEnumCompilerOptions(ts.ScriptTarget, options.target, toLowerCase);
-  }
-  return options;
-}
-
 /**
  * @param {string | undefined} configPath
  * @param {LoadTsconfigInit}
- * @returns {ts.CompilerOptions}
+ * @returns {Promise<object>}
  */
-exports.loadTsconfigOptions = function (configPath, { base, start, filename }) {
+exports.loadTsconfigOptions = async function (configPath, { base, start, filename }) {
   // throw error if `configPath` does not exist
   const tsconfig = configPath != null ? resolve(configPath) : walkParentDirs({ base, start, filename });
   if (tsconfig == null) {
-    return {};
+    return DEFAULT_TSCONFIG_OPTIONS;
   }
-  const content = ts.readConfigFile(tsconfig, ts.sys.readFile);
-  if (content.error != null || content.config == null) {
-    return {};
+  try {
+    const result = await parse(tsconfig);
+    return result.tsconfig;
+  } catch (error) {
+    console.error(error);
+    throw error;
   }
-  const { options } = ts.parseJsonConfigFileContent(content.config, ts.sys, dirname(tsconfig));
-  return normalizeCompilerOptions(options);
 };
diff --git a/yarn.lock b/yarn.lock
index 89c8f6c9..337e5ad7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5512,14 +5512,6 @@ dot-case@^1.1.0:
   dependencies:
     sentence-case "^1.1.2"
 
-dot-case@^3.0.4:
-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/dot-case/-/dot-case-3.0.4.tgz#9b2b670d00a431667a8a75ba29cd1b98809ce751"
-  integrity sha512-Kv5nKlh6yRrdrGvxeJ2e5y2eRUpkUosIW4A2AS38zwSz27zu7ufDwQPi5Jhs3XAlGNetl3bmnGhQsMtkKJnj3w==
-  dependencies:
-    no-case "^3.0.4"
-    tslib "^2.0.3"
-
 dot-prop@^4.2.1:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/dot-prop/-/dot-prop-4.2.1.tgz#45884194a71fc2cda71cbb4bceb3a4dd2f433ba4"
@@ -9949,13 +9941,6 @@ lower-case@^1.1.0, lower-case@^1.1.1, lower-case@^1.1.2:
   resolved "https://registry.yarnpkg.com/lower-case/-/lower-case-1.1.4.tgz#9a2cabd1b9e8e0ae993a4bf7d5875c39c42e8eac"
   integrity sha1-miyr0bno4K6ZOkv31YdcOcQujqw=
 
-lower-case@^2.0.2:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/lower-case/-/lower-case-2.0.2.tgz#6fa237c63dbdc4a82ca0fd882e4722dc5e634e28"
-  integrity sha512-7fm3l3NAF9WfN6W3JOmf5drwpVqX78JtoGJ3A6W0a6ZnldM41w2fV5D490psKFTpMds8TJse/eHLFFsNHHjHgg==
-  dependencies:
-    tslib "^2.0.3"
-
 lowercase-keys@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/lowercase-keys/-/lowercase-keys-1.0.0.tgz#4e3366b39e7f5457e35f1324bdf6f88d0bfc7306"
@@ -10762,14 +10747,6 @@ nice-try@^1.0.4:
   resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.5.tgz#a3378a7696ce7d223e88fc9b764bd7ef1089e366"
   integrity sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==
 
-no-case@^3.0.4:
-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/no-case/-/no-case-3.0.4.tgz#d361fd5c9800f558551a8369fc0dcd4662b6124d"
-  integrity sha512-fgAN3jGAh+RoxUGZHTSOLJIqUc2wmoBwGR4tbpNAKmmovFoWq0OdRkb0VkldReO2a2iBT/OEulG9XSUc10r3zg==
-  dependencies:
-    lower-case "^2.0.2"
-    tslib "^2.0.3"
-
 node-abi@^2.21.0:
   version "2.30.0"
   resolved "https://registry.yarnpkg.com/node-abi/-/node-abi-2.30.0.tgz#8be53bf3e7945a34eea10e0fc9a5982776cf550b"
@@ -11734,14 +11711,6 @@ param-case@^1.1.0:
   dependencies:
     sentence-case "^1.1.2"
 
-param-case@^3.0.4:
-  version "3.0.4"
-  resolved "https://registry.yarnpkg.com/param-case/-/param-case-3.0.4.tgz#7d17fe4aa12bde34d4a77d91acfb6219caad01c5"
-  integrity sha512-RXlj7zCYokReqWpOPH9oYivUzLYZ5vAPIfEmCTNViosC78F8F0H9y7T7gG2M39ymgutxF5gcFEsyZQSph9Bp3A==
-  dependencies:
-    dot-case "^3.0.4"
-    tslib "^2.0.3"
-
 parents@^1.0.0, parents@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/parents/-/parents-1.0.1.tgz#fedd4d2bf193a77745fe71e371d73c3307d9c751"
@@ -14858,6 +14827,11 @@ ts-loader@^8.3.0:
     micromatch "^4.0.0"
     semver "^7.3.4"
 
+tsconfck@^1.2.2:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/tsconfck/-/tsconfck-1.2.2.tgz#3f7ac55bcd16b8d89ff05ba8e27057f3375828c8"
+  integrity sha512-x5YpjOqjJnMs1EsJvQBQbrysrY32eGoZRRr5YvbN1hwlrXKc7jiphCOUrT7xbFdOWk8sh+EtMYbGPbTO8rDmcw==
+
 tsconfig-paths-webpack-plugin@^3.2.0:
   version "3.5.1"
   resolved "https://registry.yarnpkg.com/tsconfig-paths-webpack-plugin/-/tsconfig-paths-webpack-plugin-3.5.1.tgz#e4dbf492a20dca9caab60086ddacb703afc2b726"
@@ -14892,11 +14866,6 @@ tslib@^2.0.0, tslib@^2.0.1, tslib@^2.1.0, tslib@^2.2.0:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.3.0.tgz#803b8cdab3e12ba581a4ca41c8839bbb0dacb09e"
   integrity sha512-N82ooyxVNm6h1riLCoyS9e3fuJ3AMG2zIZs2Gd1ATcSFjSA23Q0fzjjZeh0jbJvWVDZ0cJT8yaNNaaXHzueNjg==
 
-tslib@^2.0.3:
-  version "2.3.1"
-  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.3.1.tgz#e8a335add5ceae51aa261d32a490158ef042ef01"
-  integrity sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw==
-
 tslib@~2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.1.0.tgz#da60860f1c2ecaa5703ab7d39bc05b6bf988b97a"