diff --git a/package.json b/package.json
index 6586b4dc..e23378f9 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,6 @@
     "@types/react": "^16.9.9",
     "@types/react-dom": "^16.9.2",
     "@wessberg/rollup-plugin-ts": "^1.1.73",
-    "acorn-loose": "^7.0.0",
     "builtin-modules": "^3.1.0",
     "enquirer": "^2.3.2",
     "eslint": "^6.5.1",
diff --git a/packages/parse-function/test/__snapshots__/index.ts.snap b/packages/parse-function/test/__snapshots__/index.ts.snap
index dca86817..1220d83e 100644
--- a/packages/parse-function/test/__snapshots__/index.ts.snap
+++ b/packages/parse-function/test/__snapshots__/index.ts.snap
@@ -1853,17 +1853,17 @@ Object {
 exports[`#87 - babel (default) - should work for object methods 1`] = `
 Object {
   "args": Array [
-    "__a",
-    "__b",
-    "__c",
+    "a",
+    "b",
+    "c",
   ],
   "body": "
-        return 123;
+        return a + b + c;
       ",
   "defaults": Object {
-    "__a": undefined,
-    "__b": undefined,
-    "__c": undefined,
+    "a": undefined,
+    "b": undefined,
+    "c": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -1873,9 +1873,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "foo",
-  "params": "__a, __b, __c",
-  "value": "({ foo(__a, __b, __c) {
-        return 123;
+  "params": "a, b, c",
+  "value": "({ foo(a, b, c) {
+        return a + b + c;
       } })",
 }
 `;
@@ -1883,13 +1883,13 @@ Object {
 exports[`#87 - babel (default) - should work for object methods 2`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return () => __a;
+        return () => a;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -1899,9 +1899,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "bar",
-  "params": "__a",
-  "value": "({ bar(__a) {
-        return () => __a;
+  "params": "a",
+  "value": "({ bar(a) {
+        return () => a;
       } })",
 }
 `;
@@ -1909,13 +1909,13 @@ Object {
 exports[`#87 - babel (default) - should work for object methods 3`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return yield __a * 321;
+        return yield a * 321;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -1925,9 +1925,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "gen",
-  "params": "__a",
-  "value": "({ *gen(__a) {
-        return yield __a * 321;
+  "params": "a",
+  "value": "({ *gen(a) {
+        return yield a * 321;
       } })",
 }
 `;
@@ -3811,17 +3811,17 @@ Object {
 exports[`#177 - options.parse - should work for object methods 1`] = `
 Object {
   "args": Array [
-    "__a",
-    "__b",
-    "__c",
+    "a",
+    "b",
+    "c",
   ],
   "body": "
-        return 123;
+        return a + b + c;
       ",
   "defaults": Object {
-    "__a": undefined,
-    "__b": undefined,
-    "__c": undefined,
+    "a": undefined,
+    "b": undefined,
+    "c": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -3831,9 +3831,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "foo",
-  "params": "__a, __b, __c",
-  "value": "({ foo(__a, __b, __c) {
-        return 123;
+  "params": "a, b, c",
+  "value": "({ foo(a, b, c) {
+        return a + b + c;
       } })",
 }
 `;
@@ -3841,13 +3841,13 @@ Object {
 exports[`#177 - options.parse - should work for object methods 2`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return () => __a;
+        return () => a;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -3857,9 +3857,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "bar",
-  "params": "__a",
-  "value": "({ bar(__a) {
-        return () => __a;
+  "params": "a",
+  "value": "({ bar(a) {
+        return () => a;
       } })",
 }
 `;
@@ -3867,13 +3867,13 @@ Object {
 exports[`#177 - options.parse - should work for object methods 3`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return yield __a * 321;
+        return yield a * 321;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -3883,9 +3883,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "gen",
-  "params": "__a",
-  "value": "({ *gen(__a) {
-        return yield __a * 321;
+  "params": "a",
+  "value": "({ *gen(a) {
+        return yield a * 321;
       } })",
 }
 `;
@@ -5769,17 +5769,17 @@ Object {
 exports[`#267 - acorn.parse - should work for object methods 1`] = `
 Object {
   "args": Array [
-    "__a",
-    "__b",
-    "__c",
+    "a",
+    "b",
+    "c",
   ],
   "body": "
-        return 123;
+        return a + b + c;
       ",
   "defaults": Object {
-    "__a": undefined,
-    "__b": undefined,
-    "__c": undefined,
+    "a": undefined,
+    "b": undefined,
+    "c": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -5789,9 +5789,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "foo",
-  "params": "__a, __b, __c",
-  "value": "({ foo(__a, __b, __c) {
-        return 123;
+  "params": "a, b, c",
+  "value": "({ foo(a, b, c) {
+        return a + b + c;
       } })",
 }
 `;
@@ -5799,13 +5799,13 @@ Object {
 exports[`#267 - acorn.parse - should work for object methods 2`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return () => __a;
+        return () => a;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -5815,9 +5815,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "bar",
-  "params": "__a",
-  "value": "({ bar(__a) {
-        return () => __a;
+  "params": "a",
+  "value": "({ bar(a) {
+        return () => a;
       } })",
 }
 `;
@@ -5825,13 +5825,13 @@ Object {
 exports[`#267 - acorn.parse - should work for object methods 3`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return yield __a * 321;
+        return yield a * 321;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -5841,9 +5841,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "gen",
-  "params": "__a",
-  "value": "({ *gen(__a) {
-        return yield __a * 321;
+  "params": "a",
+  "value": "({ *gen(a) {
+        return yield a * 321;
       } })",
 }
 `;
@@ -7727,17 +7727,17 @@ Object {
 exports[`#357 - acorn loose - should work for object methods 1`] = `
 Object {
   "args": Array [
-    "__a",
-    "__b",
-    "__c",
+    "a",
+    "b",
+    "c",
   ],
   "body": "
-        return 123;
+        return a + b + c;
       ",
   "defaults": Object {
-    "__a": undefined,
-    "__b": undefined,
-    "__c": undefined,
+    "a": undefined,
+    "b": undefined,
+    "c": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -7747,9 +7747,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "foo",
-  "params": "__a, __b, __c",
-  "value": "({ foo(__a, __b, __c) {
-        return 123;
+  "params": "a, b, c",
+  "value": "({ foo(a, b, c) {
+        return a + b + c;
       } })",
 }
 `;
@@ -7757,13 +7757,13 @@ Object {
 exports[`#357 - acorn loose - should work for object methods 2`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return () => __a;
+        return () => a;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -7773,9 +7773,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "bar",
-  "params": "__a",
-  "value": "({ bar(__a) {
-        return () => __a;
+  "params": "a",
+  "value": "({ bar(a) {
+        return () => a;
       } })",
 }
 `;
@@ -7783,13 +7783,13 @@ Object {
 exports[`#357 - acorn loose - should work for object methods 3`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return yield __a * 321;
+        return yield a * 321;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -7799,9 +7799,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "gen",
-  "params": "__a",
-  "value": "({ *gen(__a) {
-        return yield __a * 321;
+  "params": "a",
+  "value": "({ *gen(a) {
+        return yield a * 321;
       } })",
 }
 `;
@@ -9685,17 +9685,17 @@ Object {
 exports[`#447 - espree.parse - should work for object methods 1`] = `
 Object {
   "args": Array [
-    "__a",
-    "__b",
-    "__c",
+    "a",
+    "b",
+    "c",
   ],
   "body": "
-        return 123;
+        return a + b + c;
       ",
   "defaults": Object {
-    "__a": undefined,
-    "__b": undefined,
-    "__c": undefined,
+    "a": undefined,
+    "b": undefined,
+    "c": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -9705,9 +9705,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "foo",
-  "params": "__a, __b, __c",
-  "value": "({ foo(__a, __b, __c) {
-        return 123;
+  "params": "a, b, c",
+  "value": "({ foo(a, b, c) {
+        return a + b + c;
       } })",
 }
 `;
@@ -9715,13 +9715,13 @@ Object {
 exports[`#447 - espree.parse - should work for object methods 2`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return () => __a;
+        return () => a;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -9731,9 +9731,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "bar",
-  "params": "__a",
-  "value": "({ bar(__a) {
-        return () => __a;
+  "params": "a",
+  "value": "({ bar(a) {
+        return () => a;
       } })",
 }
 `;
@@ -9741,13 +9741,13 @@ Object {
 exports[`#447 - espree.parse - should work for object methods 3`] = `
 Object {
   "args": Array [
-    "__a",
+    "a",
   ],
   "body": "
-        return yield __a * 321;
+        return yield a * 321;
       ",
   "defaults": Object {
-    "__a": undefined,
+    "a": undefined,
   },
   "isAnonymous": false,
   "isArrow": false,
@@ -9757,9 +9757,9 @@ Object {
   "isNamed": true,
   "isValid": true,
   "name": "gen",
-  "params": "__a",
-  "value": "({ *gen(__a) {
-        return yield __a * 321;
+  "params": "a",
+  "value": "({ *gen(a) {
+        return yield a * 321;
       } })",
 }
 `;
diff --git a/packages/parse-function/test/index.ts b/packages/parse-function/test/index.ts
index 52f49fe8..fd18fae2 100644
--- a/packages/parse-function/test/index.ts
+++ b/packages/parse-function/test/index.ts
@@ -155,14 +155,14 @@ function factory(parserName, parseFn) {
 
   test(`#${testsCount++} - ${parserName} - should work for object methods`, () => {
     const obj = {
-      foo(__a, __b, __c) {
-        return 123;
+      foo(a, b, c) {
+        return a + b + c;
       },
-      bar(__a) {
-        return () => __a;
+      bar(a) {
+        return () => a;
       },
-      *gen(__a) {
-        return yield __a * 321;
+      *gen(a) {
+        return yield a * 321;
       },
     };
 
diff --git a/tsconfig.json b/tsconfig.json
index 5fe2a373..69dfa082 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,8 +3,8 @@
   "extends": "./@tunnckocore/typescript-config/monorepo.json",
   "compilerOptions": {
     "baseUrl": ".",
-    "declarationDir": "dist/types",
     "typeRoots": ["./node_modules/@types", "./@types"],
+    "declarationDir": "dist/types",
     "paths": {
       "*": ["packages/*", "@tunnckocore/*"]
     },
@@ -15,6 +15,5 @@
     "**/packages/*/**/*.ts",
     "**/@tunnckocore/*/**/*.ts",
     "**/@tunnckocore/*/**/*.d.ts"
-  ],
-  "exclude": ["node_modules"]
+  ]
 }