diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 000000000..d826961de
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1 @@
+__tests__/fixture
diff --git a/__tests__/__snapshots__/test.js.snap b/__tests__/__snapshots__/test.js.snap
index e67531100..4472a6bb5 100644
--- a/__tests__/__snapshots__/test.js.snap
+++ b/__tests__/__snapshots__/test.js.snap
@@ -11111,10 +11111,114 @@ It takes a ",
     "todos": Array [],
     "yields": Array [],
   },
+  Object {
+    "augments": Array [],
+    "context": Object {
+      "loc": Object {
+        "end": Object {
+          "column": 1,
+          "line": 189,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 177,
+        },
+      },
+    },
+    "description": Object {
+      "children": Array [
+        Object {
+          "children": Array [
+            Object {
+              "position": Object {
+                "end": Object {
+                  "column": 21,
+                  "line": 1,
+                  "offset": 20,
+                },
+                "indent": Array [],
+                "start": Object {
+                  "column": 1,
+                  "line": 1,
+                  "offset": 0,
+                },
+              },
+              "type": "text",
+              "value": "babel parser plugins",
+            },
+          ],
+          "position": Object {
+            "end": Object {
+              "column": 21,
+              "line": 1,
+              "offset": 20,
+            },
+            "indent": Array [],
+            "start": Object {
+              "column": 1,
+              "line": 1,
+              "offset": 0,
+            },
+          },
+          "type": "paragraph",
+        },
+      ],
+      "position": Object {
+        "end": Object {
+          "column": 21,
+          "line": 1,
+          "offset": 20,
+        },
+        "start": Object {
+          "column": 1,
+          "line": 1,
+          "offset": 0,
+        },
+      },
+      "type": "root",
+    },
+    "errors": Array [],
+    "examples": Array [],
+    "implements": Array [],
+    "kind": "class",
+    "loc": Object {
+      "end": Object {
+        "column": 27,
+        "line": 176,
+      },
+      "start": Object {
+        "column": 0,
+        "line": 176,
+      },
+    },
+    "members": Object {
+      "events": Array [],
+      "global": Array [],
+      "inner": Array [],
+      "instance": Array [],
+      "static": Array [],
+    },
+    "name": "A",
+    "namespace": "A",
+    "params": Array [],
+    "path": Array [
+      Object {
+        "kind": "class",
+        "name": "A",
+      },
+    ],
+    "properties": Array [],
+    "returns": Array [],
+    "sees": Array [],
+    "tags": Array [],
+    "throws": Array [],
+    "todos": Array [],
+    "yields": Array [],
+  },
 ]
 `;
 
-exports[`outputs es6.input.js markdown 1`] = `"[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]"`;
+exports[`outputs es6.input.js markdown 1`] = `"[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]"`;
 
 exports[`outputs es6.input.js markdown AST 1`] = `
 Object {
@@ -13585,6 +13689,51 @@ It takes a ",
       ],
       "type": "paragraph",
     },
+    Object {
+      "children": Array [
+        Object {
+          "type": "text",
+          "value": "A",
+        },
+      ],
+      "depth": 2,
+      "type": "heading",
+    },
+    Object {
+      "children": Array [
+        Object {
+          "position": Position {
+            "end": Object {
+              "column": 21,
+              "line": 1,
+              "offset": 20,
+            },
+            "indent": Array [],
+            "start": Object {
+              "column": 1,
+              "line": 1,
+              "offset": 0,
+            },
+          },
+          "type": "text",
+          "value": "babel parser plugins",
+        },
+      ],
+      "position": Position {
+        "end": Object {
+          "column": 21,
+          "line": 1,
+          "offset": 20,
+        },
+        "indent": Array [],
+        "start": Object {
+          "column": 1,
+          "line": 1,
+          "offset": 0,
+        },
+      },
+      "type": "paragraph",
+    },
     Object {
       "identifier": "1",
       "title": undefined,
@@ -13638,7 +13787,7 @@ It takes a ",
 }
 `;
 
-exports[`outputs es6.input.js no markdown TOC 1`] = `"[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]"`;
+exports[`outputs es6.input.js no markdown TOC 1`] = `"[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]"`;
 
 exports[`outputs es6-class.input.js JSON 1`] = `
 Array [
diff --git a/__tests__/fixture/es6.input.js b/__tests__/fixture/es6.input.js
index dde95b11e..a300409a2 100644
--- a/__tests__/fixture/es6.input.js
+++ b/__tests__/fixture/es6.input.js
@@ -172,3 +172,18 @@ export function isArrayEqualWith<T>(
 export function paramWithMemberType(a: atype.property): boolean {
   return true;
 }
+
+/** babel parser plugins */
+class A {
+  // classPrivateProperties
+  #b = 1;
+  // classPrivateMethods
+  #c(a, b) {
+    // numericSeparator
+    let y = 100_000;
+    // nullishCoalescingOperator
+    let x = a ?? b;
+    // logicalAssignment
+    return x &&= b?.b |> String.fromCharCode;
+  }
+}
diff --git a/src/input/dependency.js b/src/input/dependency.js
index e8f4f99b1..b1348c405 100644
--- a/src/input/dependency.js
+++ b/src/input/dependency.js
@@ -3,6 +3,7 @@ const path = require('path');
 const babelify = require('babelify');
 const concat = require('concat-stream');
 const moduleFilters = require('../module_filters');
+const { standardBabelParserPlugins } = require('../parsers/parse_to_ast');
 const smartGlob = require('../smart_glob.js');
 
 const STANDARD_BABEL_CONFIG = {
@@ -10,6 +11,7 @@ const STANDARD_BABEL_CONFIG = {
   compact: false,
   cwd: path.resolve(__dirname, '../../'),
   presets: ['@babel/preset-react', '@babel/preset-env', '@babel/preset-flow'],
+  parserOpts: { plugins: standardBabelParserPlugins },
   plugins: [
     // Stage 0
     '@babel/plugin-proposal-function-bind',
@@ -21,7 +23,7 @@ const STANDARD_BABEL_CONFIG = {
     ['@babel/plugin-proposal-nullish-coalescing-operator', { loose: false }],
     '@babel/plugin-proposal-do-expressions',
     // Stage 2
-    ['@babel/plugin-proposal-decorators', { legacy: true }],
+    ['@babel/plugin-proposal-decorators', { decoratorsBeforeExport: true }],
     '@babel/plugin-proposal-function-sent',
     '@babel/plugin-proposal-export-namespace-from',
     '@babel/plugin-proposal-numeric-separator',
diff --git a/src/parsers/parse_to_ast.js b/src/parsers/parse_to_ast.js
index 6b8065be7..74b61d355 100644
--- a/src/parsers/parse_to_ast.js
+++ b/src/parsers/parse_to_ast.js
@@ -6,28 +6,42 @@ const TYPESCRIPT_EXTS = {
   '.tsx': true
 };
 
+const standardBabelParserPlugins = [
+  'asyncGenerators',
+  'bigInt',
+  'classProperties',
+  'classConstructorCall',
+  'classPrivateProperties',
+  'classPrivateMethods',
+  'doExpressions',
+  'dynamicImport',
+  'exportDefaultFrom',
+  'exportNamespaceFrom',
+  'exportExtensions',
+  'functionBind',
+  'functionSent',
+  'jsx',
+  'logicalAssignment',
+  'nullishCoalescingOperator',
+  'numericSeparator',
+  'objectRestSpread',
+  'optionalCatchBinding',
+  'optionalChaining',
+  'partialApplication',
+  ['pipelineOperator', { proposal: 'minimal' }],
+  'throwExpressions'
+];
+
+module.exports.standardBabelParserPlugins = standardBabelParserPlugins;
+
 function getParserOpts(file) {
   return {
     allowImportExportEverywhere: true,
     sourceType: 'module',
     plugins: [
-      'asyncGenerators',
-      'exportDefaultFrom',
-      'exportNamespaceFrom',
-      'optionalChaining',
-      'classConstructorCall',
-      'classPrivateProperties',
-      'classProperties',
+      ...standardBabelParserPlugins,
       ['decorators', { decoratorsBeforeExport: false }],
-      'doExpressions',
-      'exportExtensions',
-      TYPESCRIPT_EXTS[path.extname(file || '')] ? 'typescript' : 'flow',
-      'functionBind',
-      'functionSent',
-      'jsx',
-      'objectRestSpread',
-      'dynamicImport',
-      'logicalAssignment'
+      TYPESCRIPT_EXTS[path.extname(file || '')] ? 'typescript' : 'flow'
     ]
   };
 }