diff --git a/.jsfmtrc b/.jsfmtrc
deleted file mode 100644
index a0cecd6..0000000
--- a/.jsfmtrc
+++ /dev/null
@@ -1,174 +0,0 @@
-{
-  "preset": "default",
-  "plugins": [
-      "esformatter-quotes",
-      "esformatter-semicolons",
-      "esformatter-braces",
-      "esformatter-quote-props",
-      "esformatter-dot-notation",
-      "esformatter-var-each",
-      "esformatter-parseint",
-      "esformatter-eol-last",
-      "esformatter-spaced-lined-comment",
-      "esformatter-remove-trailing-commas"
-    ],
-    "quotes": {
-      "type": "single",
-      "avoidEscape": false
-    },
-    "indent": {
-      "value": "  "
-    },
-    "whiteSpace" : {
-    "value" : " ",
-    "removeTrailing" : 1,
-    "before" : {
-      "ArrayExpressionOpening" : 0,
-      "ArrayExpressionClosing" : 0,
-      "ArrayExpressionComma" : 0,
-      "ArgumentComma" : 0,
-      "ArgumentList" : 0,
-      "ArgumentListArrayExpression" : 0,
-      "ArgumentListFunctionExpression" : 0,
-      "ArgumentListObjectExpression" : 0,
-      "AssignmentOperator" : 1,
-      "BinaryExpression": 0,
-      "BinaryExpressionOperator" : 1,
-      "BlockComment" : 1,
-      "CallExpression" : -1,
-      "CatchParameterList" : 0,
-      "CatchOpeningBrace" : 1,
-      "CatchClosingBrace" : 1,
-      "CatchKeyword" : 1,
-      "CommaOperator" : 0,
-      "ConditionalExpressionConsequent" : 1,
-      "ConditionalExpressionAlternate" : 1,
-      "DoWhileStatementOpeningBrace" : 1,
-      "DoWhileStatementClosingBrace" : 1,
-      "DoWhileStatementConditional" : 1,
-      "EmptyStatement" : 0,
-      "ExpressionClosingParentheses" : 0,
-      "FinallyKeyword" : -1,
-      "FinallyOpeningBrace" : 1,
-      "FinallyClosingBrace" : 1,
-      "ForInStatement" : 1,
-      "ForInStatementExpressionOpening" : 1,
-      "ForInStatementExpressionClosing" : 0,
-      "ForInStatementOpeningBrace" : 1,
-      "ForInStatementClosingBrace" : 1,
-      "ForStatement" : 1,
-      "ForStatementExpressionOpening" : 1,
-      "ForStatementExpressionClosing" : 0,
-      "ForStatementOpeningBrace" : 1,
-      "ForStatementClosingBrace" : 1,
-      "ForStatementSemicolon" : 0,
-      "FunctionDeclarationOpeningBrace" : 1,
-      "FunctionDeclarationClosingBrace" : 1,
-      "FunctionExpressionOpeningBrace" : 1,
-      "FunctionExpressionClosingBrace" : 1,
-      "IfStatementConditionalOpening" : 1,
-      "IfStatementConditionalClosing" : 0,
-      "IfStatementOpeningBrace" : 1,
-      "IfStatementClosingBrace" : 1,
-      "ElseStatementOpeningBrace" : 1,
-      "ElseStatementClosingBrace" : 1,
-      "ElseIfStatementOpeningBrace" : 1,
-      "ElseIfStatementClosingBrace" : 1,
-      "MemberExpressionClosing" : 0,
-      "LineComment" : 1,
-      "LogicalExpressionOperator" : 1,
-      "Property" : 1,
-      "PropertyValue" : 1,
-      "ParameterComma" : 0,
-      "ParameterList" : 0,
-      "SwitchDiscriminantOpening" : 1,
-      "SwitchDiscriminantClosing" : 0,
-      "ThrowKeyword": 1,
-      "TryKeyword": -1,
-      "TryOpeningBrace" : 1,
-      "TryClosingBrace" : 1,
-      "UnaryExpressionOperator": 0,
-      "VariableName" : 1,
-      "VariableValue" : 1,
-      "WhileStatementConditionalOpening" : 1,
-      "WhileStatementConditionalClosing" : 0,
-      "WhileStatementOpeningBrace" : 1,
-      "WhileStatementClosingBrace" : 1
-    },
-
-    "after" : {
-      "ArrayExpressionOpening" : 0,
-      "ArrayExpressionClosing" : 0,
-      "ArrayExpressionComma" : 1,
-      "ArgumentComma" : 1,
-      "ArgumentList" : 0,
-      "ArgumentListArrayExpression" : 0,
-      "ArgumentListFunctionExpression" : 0,
-      "ArgumentListObjectExpression" : 0,
-      "AssignmentOperator" : 1,
-      "BinaryExpression": 0,
-      "BinaryExpressionOperator" : 1,
-      "BlockComment" : 1,
-      "CallExpression" : 0,
-      "CatchParameterList" : 0,
-      "CatchOpeningBrace" : 1,
-      "CatchClosingBrace" : 1,
-      "CatchKeyword" : 1,
-      "CommaOperator" : 1,
-      "ConditionalExpressionConsequent" : 1,
-      "ConditionalExpressionTest" : 1,
-      "DoWhileStatementOpeningBrace" : 1,
-      "DoWhileStatementClosingBrace" : 1,
-      "DoWhileStatementBody" : 1,
-      "EmptyStatement" : 0,
-      "ExpressionOpeningParentheses" : 0,
-      "FinallyKeyword" : -1,
-      "FinallyOpeningBrace" : 1,
-      "FinallyClosingBrace" : 1,
-      "ForInStatement" : 1,
-      "ForInStatementExpressionOpening" : 0,
-      "ForInStatementExpressionClosing" : 1,
-      "ForInStatementOpeningBrace" : 1,
-      "ForInStatementClosingBrace" : 1,
-      "ForStatement" : 1,
-      "ForStatementExpressionOpening" : 0,
-      "ForStatementExpressionClosing" : 1,
-      "ForStatementClosingBrace" : 1,
-      "ForStatementOpeningBrace" : 1,
-      "ForStatementSemicolon" : 1,
-      "FunctionReservedWord": 0,
-      "FunctionName" : 0,
-      "FunctionExpressionOpeningBrace" : 1,
-      "FunctionExpressionClosingBrace" : 0,
-      "FunctionDeclarationOpeningBrace" : 0,
-      "FunctionDeclarationClosingBrace" : 0,
-      "IfStatementConditionalOpening" : 0,
-      "IfStatementConditionalClosing" : 1,
-      "IfStatementOpeningBrace" : 1,
-      "IfStatementClosingBrace" : 1,
-      "ElseStatementOpeningBrace" : 1,
-      "ElseStatementClosingBrace" : 1,
-      "ElseIfStatementOpeningBrace" : 1,
-      "ElseIfStatementClosingBrace" : 1,
-      "MemberExpressionOpening" : 0,
-      "LogicalExpressionOperator" : 1,
-      "ObjectExpressionClosingBrace": 0,
-      "PropertyName" : 0,
-      "PropertyValue" : 0,
-      "ParameterComma" : 1,
-      "ParameterList" : 0,
-      "SwitchDiscriminantOpening" : 0,
-      "SwitchDiscriminantClosing" : 1,
-      "ThrowKeyword": 1,
-      "TryKeyword": -1,
-      "TryOpeningBrace" : 1,
-      "TryClosingBrace" : 1,
-      "UnaryExpressionOperator": 0,
-      "VariableName" : 1,
-      "WhileStatementConditionalOpening" : 0,
-      "WhileStatementConditionalClosing" : 1,
-      "WhileStatementOpeningBrace" : 1,
-      "WhileStatementClosingBrace" : 1
-    }
-  }
-}
diff --git a/.npmignore b/.npmignore
index 5df7d03..45657ca 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,4 +1,3 @@
 test/
 .eslintrc
-.jsfmtrc
 .travis.yml
diff --git a/.travis.yml b/.travis.yml
index 33809f3..f2bcc5b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,15 +1,11 @@
 sudo: false
+dist: bionic
 language: node_js
 node_js:
-  - 5
-  - 6
-  - 7
-  - node
-
+  - 12.4.0
+install:
+  - npm ci
 script:
-  - npm run ci
+  - npm run check
   - npm test
-
-cache:
-  directories:
-    - node_modules
+cache: npm
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index f0e4fb7..f3a8060 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -242,12 +242,6 @@
         }
       }
     },
-    "acorn-to-esprima": {
-      "version": "2.0.8",
-      "resolved": "https://registry.npmjs.org/acorn-to-esprima/-/acorn-to-esprima-2.0.8.tgz",
-      "integrity": "sha1-AD8MZC65ITL0F9NwjxStqCrfLrE=",
-      "dev": true
-    },
     "ajv": {
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
@@ -264,13 +258,6 @@
       "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
       "dev": true
     },
-    "amdefine": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true,
-      "optional": true
-    },
     "ansi-escapes": {
       "version": "1.4.0",
       "resolved": "http://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
@@ -316,12 +303,9 @@
       "dev": true
     },
     "async": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.1.tgz",
-      "integrity": "sha512-fNEiL2+AZt6AlAw/29Cr0UDe4sRAHCpEHh54WMz+Bb7QfNcFw4h3loofyJpLeQs4Yx7yuqu/2dLgM5hKOs6HlQ==",
-      "requires": {
-        "lodash": "^4.17.10"
-      }
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.1.0.tgz",
+      "integrity": "sha512-4vx/aaY6j/j3Lw3fbCHNWP0pPaTCew3F6F3hYyl/tHs/ndmV1q7NW9T5yuJ2XAGwdQrP+6Wu20x06U4APo/iQQ=="
     },
     "babel-code-frame": {
       "version": "6.26.0",
@@ -359,77 +343,6 @@
         }
       }
     },
-    "babel-messages": {
-      "version": "6.23.0",
-      "resolved": "https://registry.npmjs.org/babel-messages/-/babel-messages-6.23.0.tgz",
-      "integrity": "sha1-8830cDhYA1sqKVHG7F7fbGLyYw4=",
-      "dev": true,
-      "requires": {
-        "babel-runtime": "^6.22.0"
-      }
-    },
-    "babel-runtime": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
-      "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
-      "dev": true,
-      "requires": {
-        "core-js": "^2.4.0",
-        "regenerator-runtime": "^0.11.0"
-      }
-    },
-    "babel-traverse": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.26.0.tgz",
-      "integrity": "sha1-RqnL1+3MYsjlwGTi0tjQ9ANXZu4=",
-      "dev": true,
-      "requires": {
-        "babel-code-frame": "^6.26.0",
-        "babel-messages": "^6.23.0",
-        "babel-runtime": "^6.26.0",
-        "babel-types": "^6.26.0",
-        "babylon": "^6.18.0",
-        "debug": "^2.6.8",
-        "globals": "^9.18.0",
-        "invariant": "^2.2.2",
-        "lodash": "^4.17.4"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "2.6.9",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-          "dev": true,
-          "requires": {
-            "ms": "2.0.0"
-          }
-        },
-        "ms": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
-          "dev": true
-        }
-      }
-    },
-    "babel-types": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
-      "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
-      "dev": true,
-      "requires": {
-        "babel-runtime": "^6.26.0",
-        "esutils": "^2.0.2",
-        "lodash": "^4.17.4",
-        "to-fast-properties": "^1.0.3"
-      }
-    },
-    "babylon": {
-      "version": "6.18.0",
-      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
-      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
-      "dev": true
-    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -632,29 +545,12 @@
         "typedarray": "^0.0.6"
       }
     },
-    "core-js": {
-      "version": "2.5.7",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.7.tgz",
-      "integrity": "sha512-RszJCAxg/PP6uzXVXL6BsxSXx/B05oJAQ2vkJRjyjrEcNVycaqOmNb5OTxZPE3xa5gwZduqza6L9JOCenh/Ecw==",
-      "dev": true
-    },
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
-    "cross-spawn": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz",
-      "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
-      "dev": true,
-      "requires": {
-        "lru-cache": "^4.0.1",
-        "shebang-command": "^1.2.0",
-        "which": "^1.2.9"
-      }
-    },
     "d": {
       "version": "1.0.0",
       "resolved": "http://registry.npmjs.org/d/-/d-1.0.0.tgz",
@@ -680,12 +576,6 @@
       "dev": true,
       "optional": true
     },
-    "deep-extend": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.4.2.tgz",
-      "integrity": "sha1-SLaZwn4zS/ifEIkr5DL25MfTSn8=",
-      "dev": true
-    },
     "deep-is": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
@@ -723,6 +613,15 @@
         "resolve": "^1.1.7"
       },
       "dependencies": {
+        "async": {
+          "version": "2.6.3",
+          "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+          "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+          "dev": true,
+          "requires": {
+            "lodash": "^4.17.14"
+          }
+        },
         "debug": {
           "version": "2.6.9",
           "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -732,6 +631,12 @@
             "ms": "2.0.0"
           }
         },
+        "lodash": {
+          "version": "4.17.15",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
+          "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
+          "dev": true
+        },
         "minimist": {
           "version": "1.2.0",
           "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
@@ -762,22 +667,6 @@
       "integrity": "sha1-fyjS657nsVqX79ic5j3P2qPMur8=",
       "dev": true
     },
-    "disparity": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/disparity/-/disparity-2.0.0.tgz",
-      "integrity": "sha1-V92stHMkrl9Y0swNqIbbTOnutxg=",
-      "dev": true,
-      "requires": {
-        "ansi-styles": "^2.0.1",
-        "diff": "^1.3.2"
-      }
-    },
-    "docopt": {
-      "version": "0.4.1",
-      "resolved": "https://registry.npmjs.org/docopt/-/docopt-0.4.1.tgz",
-      "integrity": "sha1-6a5NPRT3/qPkgBkjXrxfEATSLoc=",
-      "dev": true
-    },
     "doctrine": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-2.1.0.tgz",
@@ -923,69 +812,6 @@
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
       "dev": true
     },
-    "escodegen": {
-      "version": "1.7.1",
-      "resolved": "https://registry.npmjs.org/escodegen/-/escodegen-1.7.1.tgz",
-      "integrity": "sha1-MOz89mypjcZ80v0WKr626vqM5vw=",
-      "dev": true,
-      "requires": {
-        "esprima": "^1.2.2",
-        "estraverse": "^1.9.1",
-        "esutils": "^2.0.2",
-        "optionator": "^0.5.0",
-        "source-map": "~0.2.0"
-      },
-      "dependencies": {
-        "esprima": {
-          "version": "1.2.5",
-          "resolved": "https://registry.npmjs.org/esprima/-/esprima-1.2.5.tgz",
-          "integrity": "sha1-CZNQL+r2aBODJXVvMPmlH+7sEek=",
-          "dev": true
-        },
-        "estraverse": {
-          "version": "1.9.3",
-          "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-1.9.3.tgz",
-          "integrity": "sha1-r2fy3JIlgkFZUJJgkaQAXSnJu0Q=",
-          "dev": true
-        },
-        "fast-levenshtein": {
-          "version": "1.0.7",
-          "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-1.0.7.tgz",
-          "integrity": "sha1-AXjc3uAjuSkFGTrwlZ6KdjnP3Lk=",
-          "dev": true
-        },
-        "levn": {
-          "version": "0.2.5",
-          "resolved": "https://registry.npmjs.org/levn/-/levn-0.2.5.tgz",
-          "integrity": "sha1-uo0znQykphDjo/FFucr0iAcVUFQ=",
-          "dev": true,
-          "requires": {
-            "prelude-ls": "~1.1.0",
-            "type-check": "~0.3.1"
-          }
-        },
-        "optionator": {
-          "version": "0.5.0",
-          "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.5.0.tgz",
-          "integrity": "sha1-t1qJlaLUF98ltuTjhi9QqohlE2g=",
-          "dev": true,
-          "requires": {
-            "deep-is": "~0.1.2",
-            "fast-levenshtein": "~1.0.0",
-            "levn": "~0.2.5",
-            "prelude-ls": "~1.1.1",
-            "type-check": "~0.3.1",
-            "wordwrap": "~0.0.2"
-          }
-        },
-        "wordwrap": {
-          "version": "0.0.3",
-          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
-          "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
-          "dev": true
-        }
-      }
-    },
     "escope": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/escope/-/escope-3.6.0.tgz",
@@ -998,88 +824,6 @@
         "estraverse": "^4.1.1"
       }
     },
-    "esformatter": {
-      "version": "0.9.6",
-      "resolved": "https://registry.npmjs.org/esformatter/-/esformatter-0.9.6.tgz",
-      "integrity": "sha1-Ngiux4KN7uPNP0bhGSrrRyaKlX8=",
-      "dev": true,
-      "requires": {
-        "acorn-to-esprima": "^2.0.6",
-        "babel-traverse": "^6.4.5",
-        "debug": "^0.7.4",
-        "disparity": "^2.0.0",
-        "esformatter-parser": "^1.0.0",
-        "glob": "^5.0.3",
-        "minimist": "^1.1.1",
-        "mout": ">=0.9 <2.0",
-        "npm-run": "^2.0.0",
-        "resolve": "^1.1.5",
-        "rocambole": ">=0.7 <2.0",
-        "rocambole-indent": "^2.0.4",
-        "rocambole-linebreak": "^1.0.2",
-        "rocambole-node": "~1.0",
-        "rocambole-token": "^1.1.2",
-        "rocambole-whitespace": "^1.0.0",
-        "stdin": "*",
-        "strip-json-comments": "~0.1.1",
-        "supports-color": "^1.3.1",
-        "user-home": "^2.0.0"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "0.7.4",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-0.7.4.tgz",
-          "integrity": "sha1-BuHqgILCyxTjmAbiLi9vdX+Srzk=",
-          "dev": true
-        },
-        "esprima": {
-          "version": "2.7.3",
-          "resolved": "https://registry.npmjs.org/esprima/-/esprima-2.7.3.tgz",
-          "integrity": "sha1-luO3DVd59q1JzQMmc9HDEnZ7pYE=",
-          "dev": true
-        },
-        "glob": {
-          "version": "5.0.15",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-5.0.15.tgz",
-          "integrity": "sha1-G8k2ueAvSmA/zCIuz3Yz0wuLk7E=",
-          "dev": true,
-          "requires": {
-            "inflight": "^1.0.4",
-            "inherits": "2",
-            "minimatch": "2 || 3",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
-          }
-        },
-        "minimist": {
-          "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
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@@ -4081,15 +3379,6 @@
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@@ -4135,16 +3424,6 @@
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@@ -4225,12 +3494,6 @@
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diff --git a/package.json b/package.json
index 49b61e4..b11b887 100644
--- a/package.json
+++ b/package.json
@@ -17,17 +17,12 @@
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-    "ci": "npm run check",
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@@ -39,9 +34,7 @@
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+    "mongodb-schema": "^8.2.1"
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 }