src/language: remove deep-equal dependency

Node.js has a built in deep equal comparsion function.
We can use it instead of the deep-equal npm package.

Change-Id: I33d7a750faecc1270a8b2fb3fa44340ed3d0a144
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/406815
Run-TryBot: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
diff --git a/package-lock.json b/package-lock.json
index 51af64f..e35b4eb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,6 @@
       "version": "0.34.0-dev",
       "license": "MIT",
       "dependencies": {
-        "deep-equal": "2.0.5",
         "diff": "4.0.2",
         "glob": "7.1.7",
         "json-rpc2": "2.0.0",
@@ -26,7 +25,6 @@
       },
       "devDependencies": {
         "@types/adm-zip": "0.4.33",
-        "@types/deep-equal": "1.0.1",
         "@types/fs-extra": "8.1.1",
         "@types/glob": "7.1.3",
         "@types/mocha": "7.0.2",
@@ -269,12 +267,6 @@
         "@types/node": "*"
       }
     },
-    "node_modules/@types/deep-equal": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/@types/deep-equal/-/deep-equal-1.0.1.tgz",
-      "integrity": "sha512-mMUu4nWHLBlHtxXY17Fg6+ucS/MnndyOWyOe7MmwkoMYxvfQU2ajtRaEvqSUv+aVkMqH/C0NCI8UoVfRNQ10yg==",
-      "dev": true
-    },
     "node_modules/@types/fs-extra": {
       "version": "8.1.1",
       "resolved": "https://registry.npmjs.org/@types/fs-extra/-/fs-extra-8.1.1.tgz",
@@ -683,11 +675,6 @@
         "sprintf-js": "~1.0.2"
       }
     },
-    "node_modules/array-filter": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-1.0.0.tgz",
-      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM="
-    },
     "node_modules/array-union": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
@@ -745,20 +732,6 @@
         "node": ">= 4.0.0"
       }
     },
-    "node_modules/available-typed-arrays": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.2.tgz",
-      "integrity": "sha512-XWX3OX8Onv97LMk/ftVyBibpGwY5a8SmuxZPzeOxqmuEqUCOM9ZE+uIaD1VNJ5QnvU2UQusvmKbuM1FR8QWGfQ==",
-      "dependencies": {
-        "array-filter": "^1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
@@ -981,18 +954,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/call-bind": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
-      "integrity": "sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==",
-      "dependencies": {
-        "function-bind": "^1.1.1",
-        "get-intrinsic": "^1.0.2"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -1308,31 +1269,6 @@
         "node": ">=4"
       }
     },
-    "node_modules/deep-equal": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-2.0.5.tgz",
-      "integrity": "sha512-nPiRgmbAtm1a3JsnLCf6/SLfXcjyN5v8L1TXzdCmHrXJ4hx+gW/w1YCcn7z8gJtSiDArZCgYtbao3QqLm/N1Sw==",
-      "dependencies": {
-        "call-bind": "^1.0.0",
-        "es-get-iterator": "^1.1.1",
-        "get-intrinsic": "^1.0.1",
-        "is-arguments": "^1.0.4",
-        "is-date-object": "^1.0.2",
-        "is-regex": "^1.1.1",
-        "isarray": "^2.0.5",
-        "object-is": "^1.1.4",
-        "object-keys": "^1.1.1",
-        "object.assign": "^4.1.2",
-        "regexp.prototype.flags": "^1.3.0",
-        "side-channel": "^1.0.3",
-        "which-boxed-primitive": "^1.0.1",
-        "which-collection": "^1.0.1",
-        "which-typed-array": "^1.1.2"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/deep-extend": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
@@ -1354,17 +1290,6 @@
       "integrity": "sha512-0ISdNousHvZT2EiFlZeZAHBUvSxmKswVCEf8hW7KWgG4a8MVEu/3Vb6uWYozkjylyCxe0JBIiRB1jV45S70WVQ==",
       "dev": true
     },
-    "node_modules/define-properties": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
-      "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
-      "dependencies": {
-        "object-keys": "^1.0.12"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      }
-    },
     "node_modules/delayed-stream": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
@@ -1512,69 +1437,6 @@
         "is-arrayish": "^0.2.1"
       }
     },
-    "node_modules/es-abstract": {
-      "version": "1.18.0",
-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.18.0.tgz",
-      "integrity": "sha512-LJzK7MrQa8TS0ja2w3YNLzUgJCGPdPOV1yVvezjNnS89D+VR08+Szt2mz3YB2Dck/+w5tfIq/RoUAFqJJGM2yw==",
-      "dependencies": {
-        "call-bind": "^1.0.2",
-        "es-to-primitive": "^1.2.1",
-        "function-bind": "^1.1.1",
-        "get-intrinsic": "^1.1.1",
-        "has": "^1.0.3",
-        "has-symbols": "^1.0.2",
-        "is-callable": "^1.2.3",
-        "is-negative-zero": "^2.0.1",
-        "is-regex": "^1.1.2",
-        "is-string": "^1.0.5",
-        "object-inspect": "^1.9.0",
-        "object-keys": "^1.1.1",
-        "object.assign": "^4.1.2",
-        "string.prototype.trimend": "^1.0.4",
-        "string.prototype.trimstart": "^1.0.4",
-        "unbox-primitive": "^1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
-    "node_modules/es-get-iterator": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/es-get-iterator/-/es-get-iterator-1.1.2.tgz",
-      "integrity": "sha512-+DTO8GYwbMCwbywjimwZMHp8AuYXOS2JZFWoi2AlPOS3ebnII9w/NLpNZtA7A0YLaVDw+O7KFCeoIV7OPvM7hQ==",
-      "dependencies": {
-        "call-bind": "^1.0.2",
-        "get-intrinsic": "^1.1.0",
-        "has-symbols": "^1.0.1",
-        "is-arguments": "^1.1.0",
-        "is-map": "^2.0.2",
-        "is-set": "^2.0.2",
-        "is-string": "^1.0.5",
-        "isarray": "^2.0.5"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
-    "node_modules/es-to-primitive": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
-      "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
-      "dependencies": {
-        "is-callable": "^1.1.4",
-        "is-date-object": "^1.0.1",
-        "is-symbol": "^1.0.2"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/es5class": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/es5class/-/es5class-2.3.1.tgz",
@@ -2102,11 +1964,6 @@
       "integrity": "sha512-zAoAQiudy+r5SvnSw3KJy5os/oRJYHzrzja/tBDqrZtNhUw8bt6y8OBzMWcjWr+8liV8Eb6yOhw8WZ7VFZ5ZzA==",
       "dev": true
     },
-    "node_modules/foreach": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/foreach/-/foreach-2.0.5.tgz",
-      "integrity": "sha1-C+4AUBiusmDQo6865ljdATbsG5k="
-    },
     "node_modules/forever-agent": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
@@ -2192,7 +2049,8 @@
     "node_modules/function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
-      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A=="
+      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
+      "dev": true
     },
     "node_modules/functional-red-black-tree": {
       "version": "1.0.1",
@@ -2209,19 +2067,6 @@
         "node": "6.* || 8.* || >= 10.*"
       }
     },
-    "node_modules/get-intrinsic": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.1.1.tgz",
-      "integrity": "sha512-kWZrnVM42QCiEA2Ig1bG8zjoIMOgxWwYCEeNdwY6Tv/cOSeGpcoX4pXHfKUxNKVoArnrEr2e9srnAxxGIraS9Q==",
-      "dependencies": {
-        "function-bind": "^1.1.1",
-        "has": "^1.0.3",
-        "has-symbols": "^1.0.1"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/get-port": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/get-port/-/get-port-5.1.1.tgz",
@@ -2460,6 +2305,7 @@
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
       "integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
+      "dev": true,
       "dependencies": {
         "function-bind": "^1.1.1"
       },
@@ -2467,14 +2313,6 @@
         "node": ">= 0.4.0"
       }
     },
-    "node_modules/has-bigints": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/has-bigints/-/has-bigints-1.0.1.tgz",
-      "integrity": "sha512-LSBS2LjbNBTf6287JEbEzvJgftkF5qFkmCo9hDRpAzKhUOlJ+hx8dd4USs00SgsUNwc4617J9ki5YtEClM2ffA==",
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/has-flag": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
@@ -2484,17 +2322,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/has-symbols": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.2.tgz",
-      "integrity": "sha512-chXa79rL/UC2KlX17jo3vRGz0azaWEx5tGqZg5pO3NUyEJVB17dMruQlzCCOfUvElghKcm5194+BCRvi2Rv/Gw==",
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/has-yarn": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/has-yarn/-/has-yarn-2.1.0.tgz",
@@ -2697,34 +2524,12 @@
         "node": ">=8.0.0"
       }
     },
-    "node_modules/is-arguments": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/is-arguments/-/is-arguments-1.1.0.tgz",
-      "integrity": "sha512-1Ij4lOMPl/xB5kBDn7I+b2ttPMKa8szhEIrXDuXQD/oe3HJLTLhqhgGspwgyGd6MOywBUqVvYicF72lkgDnIHg==",
-      "dependencies": {
-        "call-bind": "^1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/is-arrayish": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.2.1.tgz",
       "integrity": "sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0=",
       "dev": true
     },
-    "node_modules/is-bigint": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/is-bigint/-/is-bigint-1.0.1.tgz",
-      "integrity": "sha512-J0ELF4yHFxHy0cmSxZuheDOz2luOdVvqjwmEcj8H/L1JHeuEDSDbeRP+Dk9kFVk5RTFzbucJ2Kb9F7ixY2QaCg==",
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/is-binary-path": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/is-binary-path/-/is-binary-path-2.1.0.tgz",
@@ -2737,31 +2542,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/is-boolean-object": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/is-boolean-object/-/is-boolean-object-1.1.0.tgz",
-      "integrity": "sha512-a7Uprx8UtD+HWdyYwnD1+ExtTgqQtD2k/1yJgtXP6wnMm8byhkoTZRl+95LLThpzNZJ5aEvi46cdH+ayMFRwmA==",
-      "dependencies": {
-        "call-bind": "^1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
-    "node_modules/is-callable": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.2.3.tgz",
-      "integrity": "sha512-J1DcMe8UYTBSrKezuIUTUwjXsho29693unXM2YhJUTR2txK/eG47bvNa/wipPFmZFgr/N6f1GA66dv0mEyTIyQ==",
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/is-ci": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-2.0.0.tgz",
@@ -2786,17 +2566,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/is-date-object": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/is-date-object/-/is-date-object-1.0.2.tgz",
-      "integrity": "sha512-USlDT524woQ08aoZFzh3/Z6ch9Y/EWXEHQ/AaRN0SkKq4t2Jw2R2339tSXmwuVoY7LLlBCbOIlx2myP/L5zk0g==",
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
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     "node_modules/is-extglob": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
@@ -2843,25 +2612,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/is-map": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/is-map/-/is-map-2.0.2.tgz",
-      "integrity": "sha512-cOZFQQozTha1f4MxLFzlgKYPTyj26picdZTx82hbc/Xf4K/tZOOXSCkMvU4pKioRXGDLJRn0GM7Upe7kR721yg==",
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
-    "node_modules/is-negative-zero": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/is-negative-zero/-/is-negative-zero-2.0.1.tgz",
-      "integrity": "sha512-2z6JzQvZRa9A2Y7xC6dQQm4FSTSTNWjKIYYTt4246eMTJmIo0Q+ZyOsU66X8lxK1AbB92dFeglPLrhwpeRKO6w==",
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
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     "node_modules/is-npm": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/is-npm/-/is-npm-5.0.0.tgz",
@@ -2883,17 +2633,6 @@
         "node": ">=0.12.0"
       }
     },
-    "node_modules/is-number-object": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/is-number-object/-/is-number-object-1.0.4.tgz",
-      "integrity": "sha512-zohwelOAur+5uXtk8O3GPQ1eAcu4ZX3UwxQhUlfFFMNpUd83gXgjbhJh6HmB6LUNV/ieOLQuDwJO3dWJosUeMw==",
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/is-obj": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-obj/-/is-obj-2.0.0.tgz",
@@ -2921,29 +2660,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/is-regex": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.1.2.tgz",
-      "integrity": "sha512-axvdhb5pdhEVThqJzYXwMlVuZwC+FF2DpcOhTS+y/8jVq4trxyPgfcwIxIKiyeuLlSQYKkmUaPQJ8ZE4yNKXDg==",
-      "dependencies": {
-        "call-bind": "^1.0.2",
-        "has-symbols": "^1.0.1"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
-    "node_modules/is-set": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/is-set/-/is-set-2.0.2.tgz",
-      "integrity": "sha512-+2cnTEZeY5z/iXGbLhPrOAaK/Mau5k5eXq9j14CpRTftq0pAJu2MwVRSZhyZWBzx3o6X795Lz6Bpb6R0GKf37g==",
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/is-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-2.0.0.tgz",
@@ -2953,49 +2669,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/is-string": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/is-string/-/is-string-1.0.5.tgz",
-      "integrity": "sha512-buY6VNRjhQMiF1qWDouloZlQbRhDPCebwxSjxMjxgemYT46YMd2NR0/H+fBhEfWX4A/w9TBJ+ol+okqJKFE6vQ==",
-      "engines": {
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diff --git a/package.json b/package.json
index c008717..9d97b7b 100644
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     "diff": "4.0.2",
     "glob": "7.1.7",
     "json-rpc2": "2.0.0",
@@ -66,7 +65,6 @@
   },
   "devDependencies": {
     "@types/adm-zip": "0.4.33",
-    "@types/deep-equal": "1.0.1",
     "@types/fs-extra": "8.1.1",
     "@types/glob": "7.1.3",
     "@types/mocha": "7.0.2",
diff --git a/src/language/goLanguageServer.ts b/src/language/goLanguageServer.ts
index 352aa38..4ca8354 100644
--- a/src/language/goLanguageServer.ts
+++ b/src/language/goLanguageServer.ts
@@ -8,7 +8,6 @@
 'use strict';
 
 import cp = require('child_process');
-import deepEqual = require('deep-equal');
 import fs = require('fs');
 import moment = require('moment');
 import path = require('path');
@@ -625,7 +624,7 @@
 		// select only the field whose current value comes from non-default setting.
 		if (
 			!c ||
-			!deepEqual(c.defaultValue, value) ||
+			!util.isDeepStrictEqual(c.defaultValue, value) ||
 			// c.defaultValue !== value would be most likely sufficient, except
 			// when gopls' default becomes different from extension's default.
 			// So, we also forward the key if ever explicitely stated in one of the