diff --git a/.vscode/launch.json b/.vscode/launch.json
index e69de29..da54477 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -0,0 +1,11 @@
+{
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "run testcases",
+      "runtimeArgs": ["-r", "ts-node/register/transpile-only.js"],
+      "args": ["${workspaceFolder}/src/compile-testcases.ts"]
+    }
+  ]
+}
diff --git a/package-lock.json b/package-lock.json
index 4e8af4f..bf429b8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1882,6 +1882,20 @@
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+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
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@@ -2446,6 +2460,11 @@
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@@ -2465,6 +2484,28 @@
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+        "inherits": "^2.0.4",
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@@ -2557,6 +2598,15 @@
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
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@@ -2752,6 +2807,11 @@
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+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
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+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
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-      "dev": true
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
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+      "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-4.2.1.tgz",
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+      "requires": {
+        "mimic-response": "^2.0.0"
+      }
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+    "deep-extend": {
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+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
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@@ -3059,6 +3136,16 @@
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+      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o="
+    },
+    "detect-libc": {
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+      "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups="
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@@ -3818,6 +3904,11 @@
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@@ -4076,6 +4167,24 @@
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+      "resolved": "https://registry.npmjs.org/find-elm-dependencies/-/find-elm-dependencies-2.0.2.tgz",
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+      "dev": true,
+      "requires": {
+        "firstline": "1.2.0",
+        "lodash": "4.17.15"
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+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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+          "dev": true
+        }
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@@ -4095,6 +4204,12 @@
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+      "resolved": "https://registry.npmjs.org/firstline/-/firstline-1.2.0.tgz",
+      "integrity": "sha1-yfSIbn9/vwr8EtcZQdzgaxkq6gU=",
+      "dev": true
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@@ -4144,6 +4259,11 @@
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+      "resolved": "https://registry.npmjs.org/fs-constants/-/fs-constants-1.0.0.tgz",
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@@ -4184,6 +4304,41 @@
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+      "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
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+        "console-control-strings": "^1.0.0",
+        "has-unicode": "^2.0.0",
+        "object-assign": "^4.1.0",
+        "signal-exit": "^3.0.0",
+        "string-width": "^1.0.1",
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+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
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@@ -4226,6 +4381,11 @@
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+      "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
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@@ -4436,6 +4601,11 @@
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+      "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.1.13.tgz",
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@@ -6876,6 +7055,11 @@
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@@ -6897,6 +7081,41 @@
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@@ -7505,6 +7765,11 @@
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@@ -7719,6 +8001,20 @@
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@@ -8704,11 +9012,18 @@
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@@ -8806,6 +9120,50 @@
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+        "mkdirp-classic": "^0.5.2",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.0.0"
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+        "inherits": "^2.0.3",
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+      "resolved": "https://registry.npmjs.org/temp/-/temp-0.9.1.tgz",
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+      "dev": true,
+      "requires": {
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@@ -9041,6 +9399,24 @@
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       }
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+    "tree-sitter": {
+      "version": "0.16.1",
+      "resolved": "https://registry.npmjs.org/tree-sitter/-/tree-sitter-0.16.1.tgz",
+      "integrity": "sha512-+vQBp4yefo+AQ2gv+b2PK+zglWS+9UqZGdzr05EYDSOcVb+tnr0Tj6hjknDTxUEGQagMe0JcDsIrr6peI7Yvyg==",
+      "requires": {
+        "nan": "^2.14.0",
+        "prebuild-install": "^5.0.0"
+      }
+    },
+    "tree-sitter-elm": {
+      "version": "2.7.9",
+      "resolved": "https://registry.npmjs.org/tree-sitter-elm/-/tree-sitter-elm-2.7.9.tgz",
+      "integrity": "sha512-KefXeawSgERB+fGTrg6sFiDM14KMKxxLtp11i2lCUJPXlxMhliNc/kHgVFqXGKJYMZKp8EDApo2WGpg8kZQp5g==",
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       "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-24.3.0.tgz",
@@ -9272,7 +9648,6 @@
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@@ -9426,6 +9801,11 @@
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       "dev": true
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+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+    },
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       "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.1.tgz",
@@ -9548,8 +9928,44 @@
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-      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs=",
-      "dev": true
+      "integrity": "sha1-Zws6+8VS4LVd9rd4DKdGFfI60cs="
+    },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "requires": {
+        "string-width": "^1.0.2 || 2"
+      },
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+          "version": "3.0.0",
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+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
+        },
+        "is-fullwidth-code-point": {
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+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
+        },
+        "string-width": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+          "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+          "requires": {
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "requires": {
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@@ -9629,8 +10045,7 @@
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-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
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diff --git a/package.json b/package.json
index 6d26102..01302e1 100644
--- a/package.json
+++ b/package.json
@@ -16,8 +16,8 @@
     "test": "tsdx test",
     "lint": "tsdx lint",
     "prepare": "tsdx build",
-    "run": "ts-node -O \"{\\\"module\\\": \\\"CommonJS\\\"}\" src/index.ts",
-    "testcases": "ts-node src/compile-testcases.ts"
+    "run": "ts-node src/index.ts",
+    "testcases": "ts-node -T src/compile-testcases.ts"
   },
   "peerDependencies": {},
   "husky": {
diff --git a/tsconfig.json b/tsconfig.json
index f57212b..4b5e2ce 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -2,7 +2,7 @@
   "include": ["src", "types"],
   "compilerOptions": {
     "target": "es2018",
-    "module": "esnext",
+    "module": "CommonJS",
     "lib": ["dom", "esnext"],
     "importHelpers": true,
     "declaration": true,