diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..55712c1
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "typescript.tsdk": "node_modules/typescript/lib"
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index 7687b88..2a27f5d 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,23 @@ bool({x: 1});  // => true
 a === identity(a)  // => true
 ```
 
+**is** and **isinstance** checks for strict equality and inheritance:
+
+```typescript
+const f = is(8);
+f(8)      // => true
+f(5 + 3)  // => true
+f("8")    // => false
+f(null)   // => false
+
+class A { }
+class A1 extends A { }
+class A2 extends A { }
+class B { }
+const f: any[] = [5, null, undefined, new A, new A1, new B, new A2];
+const result: A[] = f.filter(isinstance(A));  // => [f[3], f[4], f[6]]
+```
+
 **nn**, **nu** and **nnu** checks at run-time for null or undefined:
 
 ```typescript
diff --git a/package-lock.json b/package-lock.json
index 216ace2..77f2a81 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,18 +14,18 @@
       }
     },
     "@babel/core": {
-      "version": "7.6.2",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.6.2.tgz",
-      "integrity": "sha512-l8zto/fuoZIbncm+01p8zPSDZu/VuuJhAfA7d/AbzM09WR7iVhavvfNDYCNpo1VvLk6E6xgAoP9P+/EMJHuRkQ==",
+      "version": "7.6.4",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.6.4.tgz",
+      "integrity": "sha512-Rm0HGw101GY8FTzpWSyRbki/jzq+/PkNQJ+nSulrdY6gFGOsNseCqD6KHRYe2E+EdzuBdr2pxCp6s4Uk6eJ+XQ==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.5.5",
-        "@babel/generator": "^7.6.2",
+        "@babel/generator": "^7.6.4",
         "@babel/helpers": "^7.6.2",
-        "@babel/parser": "^7.6.2",
+        "@babel/parser": "^7.6.4",
         "@babel/template": "^7.6.0",
-        "@babel/traverse": "^7.6.2",
-        "@babel/types": "^7.6.0",
+        "@babel/traverse": "^7.6.3",
+        "@babel/types": "^7.6.3",
         "convert-source-map": "^1.1.0",
         "debug": "^4.1.0",
         "json5": "^2.1.0",
@@ -59,12 +59,12 @@
       }
     },
     "@babel/generator": {
-      "version": "7.6.2",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.6.2.tgz",
-      "integrity": "sha512-j8iHaIW4gGPnViaIHI7e9t/Hl8qLjERI6DcV9kEpAIDJsAOrcnXqRS7t+QbhL76pwbtqP+QCQLL0z1CyVmtjjQ==",
+      "version": "7.6.4",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.6.4.tgz",
+      "integrity": "sha512-jsBuXkFoZxk0yWLyGI9llT9oiQ2FeTASmRFE32U+aaDTfoE92t78eroO7PTpU/OrYq38hlcDM6vbfLDaOLy+7w==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.6.0",
+        "@babel/types": "^7.6.3",
         "jsesc": "^2.5.1",
         "lodash": "^4.17.13",
         "source-map": "^0.5.0"
@@ -317,9 +317,9 @@
       }
     },
     "@babel/parser": {
-      "version": "7.6.2",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.6.2.tgz",
-      "integrity": "sha512-mdFqWrSPCmikBoaBYMuBulzTIKuXVPtEISFbRRVNwMWpCms/hmE2kRq0bblUHaNRKrjRlmVbx1sDHmjmRgD2Xg==",
+      "version": "7.6.4",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.6.4.tgz",
+      "integrity": "sha512-D8RHPW5qd0Vbyo3qb+YjO5nvUVRTXFLQ/FsDxJU2Nqz4uB5EnUN0ZQSEYpvTIbRuttig1XbHWU5oMeQwQSAA+A==",
       "dev": true
     },
     "@babel/plugin-proposal-async-generator-functions": {
@@ -487,9 +487,9 @@
       }
     },
     "@babel/plugin-transform-block-scoping": {
-      "version": "7.6.2",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-block-scoping/-/plugin-transform-block-scoping-7.6.2.tgz",
-      "integrity": "sha512-zZT8ivau9LOQQaOGC7bQLQOT4XPkPXgN2ERfUgk1X8ql+mVkLc4E8eKk+FO3o0154kxzqenWCorfmEXpEZcrSQ==",
+      "version": "7.6.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-block-scoping/-/plugin-transform-block-scoping-7.6.3.tgz",
+      "integrity": "sha512-7hvrg75dubcO3ZI2rjYTzUrEuh1E9IyDEhhB6qfcooxhDA33xx2MasuLVgdxzcP6R/lipAC6n9ub9maNW6RKdw==",
       "dev": true,
       "requires": {
         "@babel/helper-plugin-utils": "^7.0.0",
@@ -561,9 +561,9 @@
       }
     },
     "@babel/plugin-transform-flow-strip-types": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-flow-strip-types/-/plugin-transform-flow-strip-types-7.4.4.tgz",
-      "integrity": "sha512-WyVedfeEIILYEaWGAUWzVNyqG4sfsNooMhXWsu/YzOvVGcsnPb5PguysjJqI3t3qiaYj0BR8T2f5njdjTGe44Q==",
+      "version": "7.6.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-flow-strip-types/-/plugin-transform-flow-strip-types-7.6.3.tgz",
+      "integrity": "sha512-l0ETkyEofkqFJ9LS6HChNIKtVJw2ylKbhYMlJ5C6df+ldxxaLIyXY4yOdDQQspfFpV8/vDiaWoJlvflstlYNxg==",
       "dev": true,
       "requires": {
         "@babel/helper-plugin-utils": "^7.0.0",
@@ -652,9 +652,9 @@
       }
     },
     "@babel/plugin-transform-named-capturing-groups-regex": {
-      "version": "7.6.2",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-named-capturing-groups-regex/-/plugin-transform-named-capturing-groups-regex-7.6.2.tgz",
-      "integrity": "sha512-xBdB+XOs+lgbZc2/4F5BVDVcDNS4tcSKQc96KmlqLEAwz6tpYPEvPdmDfvVG0Ssn8lAhronaRs6Z6KSexIpK5g==",
+      "version": "7.6.3",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-named-capturing-groups-regex/-/plugin-transform-named-capturing-groups-regex-7.6.3.tgz",
+      "integrity": "sha512-jTkk7/uE6H2s5w6VlMHeWuH+Pcy2lmdwFoeWCVnvIrDUnB5gQqTVI8WfmEAhF2CDEarGrknZcmSFg1+bkfCoSw==",
       "dev": true,
       "requires": {
         "regexpu-core": "^4.6.0"
@@ -787,9 +787,9 @@
       }
     },
     "@babel/preset-env": {
-      "version": "7.6.2",
-      "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.6.2.tgz",
-      "integrity": "sha512-Ru7+mfzy9M1/YTEtlDS8CD45jd22ngb9tXnn64DvQK3ooyqSw9K4K9DUWmYknTTVk4TqygL9dqCrZgm1HMea/Q==",
+      "version": "7.6.3",
+      "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.6.3.tgz",
+      "integrity": "sha512-CWQkn7EVnwzlOdR5NOm2+pfgSNEZmvGjOhlCHBDq0J8/EStr+G+FvPEiz9B56dR6MoiUFjXhfE4hjLoAKKJtIQ==",
       "dev": true,
       "requires": {
         "@babel/helper-module-imports": "^7.0.0",
@@ -808,7 +808,7 @@
         "@babel/plugin-transform-arrow-functions": "^7.2.0",
         "@babel/plugin-transform-async-to-generator": "^7.5.0",
         "@babel/plugin-transform-block-scoped-functions": "^7.2.0",
-        "@babel/plugin-transform-block-scoping": "^7.6.2",
+        "@babel/plugin-transform-block-scoping": "^7.6.3",
         "@babel/plugin-transform-classes": "^7.5.5",
         "@babel/plugin-transform-computed-properties": "^7.2.0",
         "@babel/plugin-transform-destructuring": "^7.6.0",
@@ -823,7 +823,7 @@
         "@babel/plugin-transform-modules-commonjs": "^7.6.0",
         "@babel/plugin-transform-modules-systemjs": "^7.5.0",
         "@babel/plugin-transform-modules-umd": "^7.2.0",
-        "@babel/plugin-transform-named-capturing-groups-regex": "^7.6.2",
+        "@babel/plugin-transform-named-capturing-groups-regex": "^7.6.3",
         "@babel/plugin-transform-new-target": "^7.4.4",
         "@babel/plugin-transform-object-super": "^7.5.5",
         "@babel/plugin-transform-parameters": "^7.4.4",
@@ -836,7 +836,7 @@
         "@babel/plugin-transform-template-literals": "^7.4.4",
         "@babel/plugin-transform-typeof-symbol": "^7.2.0",
         "@babel/plugin-transform-unicode-regex": "^7.6.2",
-        "@babel/types": "^7.6.0",
+        "@babel/types": "^7.6.3",
         "browserslist": "^4.6.0",
         "core-js-compat": "^3.1.1",
         "invariant": "^2.2.2",
@@ -855,9 +855,9 @@
       }
     },
     "@babel/runtime": {
-      "version": "7.6.2",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.6.2.tgz",
-      "integrity": "sha512-EXxN64agfUqqIGeEjI5dL5z0Sw0ZwWo1mLTi4mQowCZ42O59b7DRpZAnTC6OqdF28wMBMFKNb/4uFGrVaigSpg==",
+      "version": "7.6.3",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.6.3.tgz",
+      "integrity": "sha512-kq6anf9JGjW8Nt5rYfEuGRaEAaH1mkv3Bbu6rYvLOpPh/RusSJXuKPEAoZ7L7gybZkchE8+NV5g9vKF4AGAtsA==",
       "dev": true,
       "requires": {
         "regenerator-runtime": "^0.13.2"
@@ -875,17 +875,17 @@
       }
     },
     "@babel/traverse": {
-      "version": "7.6.2",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.6.2.tgz",
-      "integrity": "sha512-8fRE76xNwNttVEF2TwxJDGBLWthUkHWSldmfuBzVRmEDWOtu4XdINTgN7TDWzuLg4bbeIMLvfMFD9we5YcWkRQ==",
+      "version": "7.6.3",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.6.3.tgz",
+      "integrity": "sha512-unn7P4LGsijIxaAJo/wpoU11zN+2IaClkQAxcJWBNCMS6cmVh802IyLHNkAjQ0iYnRS3nnxk5O3fuXW28IMxTw==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.5.5",
-        "@babel/generator": "^7.6.2",
+        "@babel/generator": "^7.6.3",
         "@babel/helper-function-name": "^7.1.0",
         "@babel/helper-split-export-declaration": "^7.4.4",
-        "@babel/parser": "^7.6.2",
-        "@babel/types": "^7.6.0",
+        "@babel/parser": "^7.6.3",
+        "@babel/types": "^7.6.3",
         "debug": "^4.1.0",
         "globals": "^11.1.0",
         "lodash": "^4.17.13"
@@ -909,9 +909,9 @@
       }
     },
     "@babel/types": {
-      "version": "7.6.1",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.6.1.tgz",
-      "integrity": "sha512-X7gdiuaCmA0uRjCmRtYJNAVCc/q+5xSgsfKJHqMN4iNLILX39677fJE1O40arPMh0TTtS9ItH67yre6c7k6t0g==",
+      "version": "7.6.3",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.6.3.tgz",
+      "integrity": "sha512-CqbcpTxMcpuQTMhjI37ZHVgjBkysg5icREQIEZ0eG1yCNwg3oy+5AaLiOKmjsCj6nqOsa6Hf0ObjRVwokb7srA==",
       "dev": true,
       "requires": {
         "esutils": "^2.0.2",
@@ -1170,9 +1170,9 @@
       }
     },
     "@types/jest": {
-      "version": "24.0.18",
-      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-24.0.18.tgz",
-      "integrity": "sha512-jcDDXdjTcrQzdN06+TSVsPPqxvsZA/5QkYfIZlq1JMw7FdP5AZylbOc+6B/cuDurctRe+MziUMtQ3xQdrbjqyQ==",
+      "version": "24.0.19",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-24.0.19.tgz",
+      "integrity": "sha512-YYiqfSjocv7lk5H/T+v5MjATYjaTMsUkbDnjGqSMoO88jWdtJXJV4ST/7DKZcoMHMBvB2SeSfyOzZfkxXHR5xg==",
       "dev": true,
       "requires": {
         "@types/jest-diff": "*"
@@ -1185,9 +1185,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "12.7.8",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.8.tgz",
-      "integrity": "sha512-FMdVn84tJJdV+xe+53sYiZS4R5yn1mAIxfj+DVoNiQjTYz1+OYmjwEZr1ev9nU0axXwda0QDbYl06QHanRVH3A==",
+      "version": "12.11.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.11.1.tgz",
+      "integrity": "sha512-TJtwsqZ39pqcljJpajeoofYRfeZ7/I/OMUQ5pR4q5wOKf2ocrUvBAZUMhWsOvKx3dVc/aaV5GluBivt0sWqA5A==",
       "dev": true
     },
     "@types/q": {
@@ -1232,6 +1232,16 @@
       "integrity": "sha512-2scffjvioEmNz0OyDSLGWDfKCVwaKc6l9Pm9kOIREU13ClXZvHpg/nRL5xyjSSSLhOnXqft2HpsAzNEEA8cFFg==",
       "dev": true
     },
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "dev": true,
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
     "acorn": {
       "version": "5.7.3",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
@@ -1311,6 +1321,21 @@
         "normalize-path": "^2.1.1"
       }
     },
+    "apache-crypt": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/apache-crypt/-/apache-crypt-1.2.1.tgz",
+      "integrity": "sha1-1vxyqm0n2ZyVqU/RiNcx7v/6Zjw=",
+      "dev": true,
+      "requires": {
+        "unix-crypt-td-js": "^1.0.0"
+      }
+    },
+    "apache-md5": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/apache-md5/-/apache-md5-1.1.2.tgz",
+      "integrity": "sha1-7klza2ObTxCLbp5ibG2pkwa0FpI=",
+      "dev": true
+    },
     "arg": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/arg/-/arg-4.1.1.tgz",
@@ -1383,6 +1408,12 @@
       "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
       "dev": true
     },
+    "async-each": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
+      "integrity": "sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ==",
+      "dev": true
+    },
     "async-limiter": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
@@ -1408,18 +1439,18 @@
       "dev": true
     },
     "autoprefixer": {
-      "version": "9.6.1",
-      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-9.6.1.tgz",
-      "integrity": "sha512-aVo5WxR3VyvyJxcJC3h4FKfwCQvQWb1tSI5VHNibddCVWrcD1NvlxEweg3TSgiPztMnWfjpy2FURKA2kvDE+Tw==",
+      "version": "9.6.5",
+      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-9.6.5.tgz",
+      "integrity": "sha512-rGd50YV8LgwFQ2WQp4XzOTG69u1qQsXn0amww7tjqV5jJuNazgFKYEVItEBngyyvVITKOg20zr2V+9VsrXJQ2g==",
       "dev": true,
       "requires": {
-        "browserslist": "^4.6.3",
-        "caniuse-lite": "^1.0.30000980",
+        "browserslist": "^4.7.0",
+        "caniuse-lite": "^1.0.30000999",
         "chalk": "^2.4.2",
         "normalize-range": "^0.1.2",
         "num2fraction": "^1.2.2",
-        "postcss": "^7.0.17",
-        "postcss-value-parser": "^4.0.0"
+        "postcss": "^7.0.18",
+        "postcss-value-parser": "^4.0.2"
       }
     },
     "aws-sign2": {
@@ -1576,6 +1607,21 @@
         }
       }
     },
+    "basic-auth": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/basic-auth/-/basic-auth-2.0.1.tgz",
+      "integrity": "sha512-NF+epuEdnUYVlGuhaxbbq+dvJttwLnGY+YixlXlME5KpQ5W3CnXA5cVTneY3SPbPDRkcjMbifrwmFYcClgOZeg==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "batch": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/batch/-/batch-0.6.1.tgz",
+      "integrity": "sha1-3DQxT05nkxgJP8dgJyUl+UvyXBY=",
+      "dev": true
+    },
     "bcrypt-pbkdf": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
@@ -1585,12 +1631,24 @@
         "tweetnacl": "^0.14.3"
       }
     },
+    "bcryptjs": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/bcryptjs/-/bcryptjs-2.4.3.tgz",
+      "integrity": "sha1-mrVie5PmBiH/fNrF2pczAn3x0Ms=",
+      "dev": true
+    },
     "big.js": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-3.2.0.tgz",
       "integrity": "sha512-+hN/Zh2D08Mx65pZ/4g5bsmNiZUuChDiQfTUQ7qJr4/kuopCr88xZsAXv6mBoZEsUI4OuGHlX59qE94K2mMW8Q==",
       "dev": true
     },
+    "binary-extensions": {
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
+      "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==",
+      "dev": true
+    },
     "boolbase": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/boolbase/-/boolbase-1.0.0.tgz",
@@ -1669,14 +1727,14 @@
       }
     },
     "browserslist": {
-      "version": "4.7.0",
-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.7.0.tgz",
-      "integrity": "sha512-9rGNDtnj+HaahxiVV38Gn8n8Lr8REKsel68v1sPFfIGEK6uSXTY3h9acgiT1dZVtOOUtifo/Dn8daDQ5dUgVsA==",
+      "version": "4.7.1",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.7.1.tgz",
+      "integrity": "sha512-QtULFqKIAtiyNx7NhZ/p4rB8m3xDozVo/pi5VgTlADLF2tNigz/QH+v0m5qhn7XfHT7u+607NcCNOnC0HZAlMg==",
       "dev": true,
       "requires": {
-        "caniuse-lite": "^1.0.30000989",
-        "electron-to-chromium": "^1.3.247",
-        "node-releases": "^1.1.29"
+        "caniuse-lite": "^1.0.30000999",
+        "electron-to-chromium": "^1.3.284",
+        "node-releases": "^1.1.36"
       }
     },
     "bs-logger": {
@@ -1777,9 +1835,9 @@
       }
     },
     "caniuse-lite": {
-      "version": "1.0.30000997",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000997.tgz",
-      "integrity": "sha512-BQLFPIdj2ntgBNWp9Q64LGUIEmvhKkzzHhUHR3CD5A9Lb7ZKF20/+sgadhFap69lk5XmK1fTUleDclaRFvgVUA==",
+      "version": "1.0.30000999",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000999.tgz",
+      "integrity": "sha512-1CUyKyecPeksKwXZvYw0tEoaMCo/RwBlXmEtN5vVnabvO0KPd9RQLcaAuR9/1F+KDMv6esmOFWlsXuzDk+8rxg==",
       "dev": true
     },
     "capture-exit": {
@@ -1808,6 +1866,34 @@
         "supports-color": "^5.3.0"
       }
     },
+    "chokidar": {
+      "version": "2.1.8",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
+      "integrity": "sha512-ZmZUazfOzf0Nve7duiCKD23PFSCs4JPoYyccjUFF3aQkQadqBhfzhjkwBH2mNOG9cTBwhamM37EIsIkZw3nRgg==",
+      "dev": true,
+      "requires": {
+        "anymatch": "^2.0.0",
+        "async-each": "^1.0.1",
+        "braces": "^2.3.2",
+        "fsevents": "^1.2.7",
+        "glob-parent": "^3.1.0",
+        "inherits": "^2.0.3",
+        "is-binary-path": "^1.0.0",
+        "is-glob": "^4.0.0",
+        "normalize-path": "^3.0.0",
+        "path-is-absolute": "^1.0.0",
+        "readdirp": "^2.2.1",
+        "upath": "^1.1.1"
+      },
+      "dependencies": {
+        "normalize-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz",
+          "integrity": "sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==",
+          "dev": true
+        }
+      }
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -1910,6 +1996,12 @@
         "simple-swizzle": "^0.2.2"
       }
     },
+    "colors": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
+      "integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA==",
+      "dev": true
+    },
     "combined-stream": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
@@ -1920,9 +2012,9 @@
       }
     },
     "commander": {
-      "version": "2.20.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.1.tgz",
-      "integrity": "sha512-cCuLsMhJeWQ/ZpsFTbE765kvVfoeSddc4nU3up4fV+fDBcfUXnbITJ+JzhkdjzOqhURjZgujxaioam4RM9yGUg==",
+      "version": "2.20.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
+      "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
       "dev": true
     },
     "component-emitter": {
@@ -1946,6 +2038,18 @@
         "source-map": "^0.6.1"
       }
     },
+    "connect": {
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/connect/-/connect-3.7.0.tgz",
+      "integrity": "sha512-ZqRXc+tZukToSNmh5C2iWMSoV3X1YUcPbqEM4DkEG5tNQXrQUZCNVGGv3IuicnkMtPfGf3Xtp8WCXs295iQ1pQ==",
+      "dev": true,
+      "requires": {
+        "debug": "2.6.9",
+        "finalhandler": "1.1.2",
+        "parseurl": "~1.3.3",
+        "utils-merge": "1.0.1"
+      }
+    },
     "convert-source-map": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.6.0.tgz",
@@ -1962,12 +2066,12 @@
       "dev": true
     },
     "core-js-compat": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/core-js-compat/-/core-js-compat-3.2.1.tgz",
-      "integrity": "sha512-MwPZle5CF9dEaMYdDeWm73ao/IflDH+FjeJCWEADcEgFSE9TLimFKwJsfmkwzI8eC0Aj0mgvMDjeQjrElkz4/A==",
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/core-js-compat/-/core-js-compat-3.3.2.tgz",
+      "integrity": "sha512-gfiK4QnNXhnnHVOIZst2XHdFfdMTPxtR0EGs0TdILMlGIft+087oH6/Sw2xTTIjpWXC9vEwsJA8VG3XTGcmO5g==",
       "dev": true,
       "requires": {
-        "browserslist": "^4.6.6",
+        "browserslist": "^4.7.0",
         "semver": "^6.3.0"
       },
       "dependencies": {
@@ -1985,6 +2089,16 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
+    "cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "dev": true,
+      "requires": {
+        "object-assign": "^4",
+        "vary": "^1"
+      }
+    },
     "cosmiconfig": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.2.1.tgz",
@@ -2462,6 +2576,18 @@
       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
       "dev": true
     },
+    "depd": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak=",
+      "dev": true
+    },
+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA=",
+      "dev": true
+    },
     "detect-newline": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/detect-newline/-/detect-newline-2.1.0.tgz",
@@ -2548,10 +2674,16 @@
         "safer-buffer": "^2.1.0"
       }
     },
+    "ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0=",
+      "dev": true
+    },
     "electron-to-chromium": {
-      "version": "1.3.269",
-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.269.tgz",
-      "integrity": "sha512-t2ZTfo07HxkxTOUbIwMmqHBSnJsC9heqJUm7LwQu2iSk0wNhG4H5cMREtb8XxeCrQABDZ6IqQKY3yZq+NfAqwg==",
+      "version": "1.3.285",
+      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.285.tgz",
+      "integrity": "sha512-DYR9KW723sUbGK++DCmCmM95AbNXT4Q0tlCFMcYijFjayhuDqlGYR68OemlP8MJj0gjkwdeItIUfd0oLCgw+4A==",
       "dev": true
     },
     "emoji-regex": {
@@ -2566,6 +2698,12 @@
       "integrity": "sha1-TapNnbAPmBmIDHn6RXrlsJof04k=",
       "dev": true
     },
+    "encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k=",
+      "dev": true
+    },
     "end-of-stream": {
       "version": "1.4.4",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.4.tgz",
@@ -2591,9 +2729,9 @@
       }
     },
     "es-abstract": {
-      "version": "1.14.2",
-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.14.2.tgz",
-      "integrity": "sha512-DgoQmbpFNOofkjJtKwr87Ma5EW4Dc8fWhD0R+ndq7Oc456ivUfGOOP6oAZTTKl5/CcNMP+EN+e3/iUzgE0veZg==",
+      "version": "1.15.0",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.15.0.tgz",
+      "integrity": "sha512-bhkEqWJ2t2lMeaJDuk7okMkJWI/yqgH/EoGwpcvv0XW9RWQsRspI4wt6xuyuvMvvQE3gg/D9HXppgk21w78GyQ==",
       "dev": true,
       "requires": {
         "es-to-primitive": "^1.2.0",
@@ -2604,8 +2742,8 @@
         "is-regex": "^1.0.4",
         "object-inspect": "^1.6.0",
         "object-keys": "^1.1.1",
-        "string.prototype.trimleft": "^2.0.0",
-        "string.prototype.trimright": "^2.0.0"
+        "string.prototype.trimleft": "^2.1.0",
+        "string.prototype.trimright": "^2.1.0"
       }
     },
     "es-to-primitive": {
@@ -2625,6 +2763,12 @@
       "integrity": "sha512-eO6vFm0JvqGzjWIQA6QVKjxpmELfhWbDUWHm1rPfIbn55mhKPiAa5xpLmQWJrNa629ZIeQ8ZvMAi13kvrjK6Mg==",
       "dev": true
     },
+    "escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
+      "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg=",
+      "dev": true
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
@@ -2668,6 +2812,27 @@
       "integrity": "sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==",
       "dev": true
     },
+    "etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
+      "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc=",
+      "dev": true
+    },
+    "event-stream": {
+      "version": "3.3.4",
+      "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-3.3.4.tgz",
+      "integrity": "sha1-SrTJoPWlTbkzi0w02Gv86PSzVXE=",
+      "dev": true,
+      "requires": {
+        "duplexer": "~0.1.1",
+        "from": "~0",
+        "map-stream": "~0.1.0",
+        "pause-stream": "0.0.11",
+        "split": "0.3",
+        "stream-combiner": "~0.0.4",
+        "through": "~2.3.1"
+      }
+    },
     "exec-sh": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/exec-sh/-/exec-sh-0.3.2.tgz",
@@ -2866,6 +3031,15 @@
       "integrity": "sha512-483XLLxTVIwWK3QTrMGRqUfUpoOs/0hbQrl2oz4J0pAcm3A3bu84wxTFqGqkJzewCLdME38xJLJAxBABfQT8sQ==",
       "dev": true
     },
+    "faye-websocket": {
+      "version": "0.11.3",
+      "resolved": "https://registry.npmjs.org/faye-websocket/-/faye-websocket-0.11.3.tgz",
+      "integrity": "sha512-D2y4bovYpzziGgbHYtGCMjlJM36vAl/y+xUyn1C+FVx8szd1E+86KwVw6XvYSzOP8iMpm1X0I4xJD+QtUb36OA==",
+      "dev": true,
+      "requires": {
+        "websocket-driver": ">=0.5.1"
+      }
+    },
     "fb-watchman": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/fb-watchman/-/fb-watchman-2.0.0.tgz",
@@ -2914,6 +3088,21 @@
         }
       }
     },
+    "finalhandler": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
+      "integrity": "sha512-aAWcW57uxVNrQZqFXjITpW3sIUQmHGG3qSb9mUah9MgMC4NeWhNOlNjXEYq3HjRAvL6arUviZGGJsBg6z0zsWA==",
+      "dev": true,
+      "requires": {
+        "debug": "2.6.9",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "on-finished": "~2.3.0",
+        "parseurl": "~1.3.3",
+        "statuses": "~1.5.0",
+        "unpipe": "~1.0.0"
+      }
+    },
     "find-up": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
@@ -2955,6 +3144,18 @@
         "map-cache": "^0.2.2"
       }
     },
+    "fresh": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
+      "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac=",
+      "dev": true
+    },
+    "from": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/from/-/from-0.1.7.tgz",
+      "integrity": "sha1-g8YK/Fi5xWmXAH7Rp2izqzA6RP4=",
+      "dev": true
+    },
     "fs-extra": {
       "version": "8.1.0",
       "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
@@ -3579,6 +3780,27 @@
         "path-is-absolute": "^1.0.0"
       }
     },
+    "glob-parent": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
+      "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
+      "dev": true,
+      "requires": {
+        "is-glob": "^3.1.0",
+        "path-dirname": "^1.0.0"
+      },
+      "dependencies": {
+        "is-glob": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-3.1.0.tgz",
+          "integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=",
+          "dev": true,
+          "requires": {
+            "is-extglob": "^2.1.0"
+          }
+        }
+      }
+    },
     "globals": {
       "version": "11.12.0",
       "resolved": "https://registry.npmjs.org/globals/-/globals-11.12.0.tgz",
@@ -3628,9 +3850,9 @@
       }
     },
     "handlebars": {
-      "version": "4.4.0",
-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.4.0.tgz",
-      "integrity": "sha512-xkRtOt3/3DzTKMOt3xahj2M/EqNhY988T+imYSlMgs5fVhLN2fmKVVj0LtEGmb+3UUYV5Qmm1052Mm3dIQxOvw==",
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.4.3.tgz",
+      "integrity": "sha512-B0W4A2U1ww3q7VVthTKfh+epHx+q4mCt6iK+zEAzbMBpWQAwxCeKxEGpj/1oQTpzPXDNSOG7hmG14TsISH50yw==",
       "dev": true,
       "requires": {
         "neo-async": "^2.6.0",
@@ -3732,9 +3954,9 @@
       "dev": true
     },
     "hosted-git-info": {
-      "version": "2.8.4",
-      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.4.tgz",
-      "integrity": "sha512-pzXIvANXEFrc5oFFXRMkbLPQ2rXRoDERwDLyrcUxGhaZhgP54BBSl9Oheh7Vv0T090cszWBxPjkQQ5Sq1PbBRQ==",
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.8.5.tgz",
+      "integrity": "sha512-kssjab8CvdXfcXMXVcvsXum4Hwdq9XGtRD3TteMEvEbq0LXyiNQr6AprqKqfeaDXze7SxWvRxdpwE6ku7ikLkg==",
       "dev": true
     },
     "hsl-regex": {
@@ -3764,6 +3986,37 @@
         "whatwg-encoding": "^1.0.1"
       }
     },
+    "http-auth": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/http-auth/-/http-auth-3.1.3.tgz",
+      "integrity": "sha1-lFz63WZSHq+PfISRPTd9exXyTjE=",
+      "dev": true,
+      "requires": {
+        "apache-crypt": "^1.1.2",
+        "apache-md5": "^1.0.6",
+        "bcryptjs": "^2.3.0",
+        "uuid": "^3.0.0"
+      }
+    },
+    "http-errors": {
+      "version": "1.7.3",
+      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.3.tgz",
+      "integrity": "sha512-ZTTX0MWrsQ2ZAhA1cejAwDLycFsd7I7nVtnkT3Ol0aqodaKW+0CTZDQ1uBv5whptCnc8e8HeRRJxRs0kmm/Qfw==",
+      "dev": true,
+      "requires": {
+        "depd": "~1.1.2",
+        "inherits": "2.0.4",
+        "setprototypeof": "1.1.1",
+        "statuses": ">= 1.5.0 < 2",
+        "toidentifier": "1.0.0"
+      }
+    },
+    "http-parser-js": {
+      "version": "0.4.10",
+      "resolved": "https://registry.npmjs.org/http-parser-js/-/http-parser-js-0.4.10.tgz",
+      "integrity": "sha1-ksnBN0w1CF912zWexWzCV8u5P6Q=",
+      "dev": true
+    },
     "http-signature": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/http-signature/-/http-signature-1.2.0.tgz",
@@ -3897,6 +4150,15 @@
       "integrity": "sha1-d8mYQFJ6qOyxqLppe4BkWnqSap0=",
       "dev": true
     },
+    "is-binary-path": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-binary-path/-/is-binary-path-1.0.1.tgz",
+      "integrity": "sha1-dfFmQrSA8YenEcgUFh/TpKdlWJg=",
+      "dev": true,
+      "requires": {
+        "binary-extensions": "^1.0.0"
+      }
+    },
     "is-buffer": {
       "version": "1.1.6",
       "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-1.1.6.tgz",
@@ -3989,6 +4251,12 @@
       "integrity": "sha1-YrEQ4omkcUGOPsNqYX1HLjAd/Ik=",
       "dev": true
     },
+    "is-extglob": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
+      "integrity": "sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=",
+      "dev": true
+    },
     "is-fullwidth-code-point": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
@@ -4001,6 +4269,15 @@
       "integrity": "sha512-cTIB4yPYL/Grw0EaSzASzg6bBy9gqCofvWN8okThAYIxKJZC+udlRAmGbM0XLeniEJSs8uEgHPGuHSe1XsOLSQ==",
       "dev": true
     },
+    "is-glob": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.1.tgz",
+      "integrity": "sha512-5G0tKtBTFImOqDnLB2hG6Bp2qcKEFduo4tZu9MT/H6NQv/ghhy30o55ufafxJ/LdH79LLs2Kfrn85TLKyA7BUg==",
+      "dev": true,
+      "requires": {
+        "is-extglob": "^2.1.1"
+      }
+    },
     "is-module": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-module/-/is-module-1.0.0.tgz",
@@ -4749,9 +5026,9 @@
       "dev": true
     },
     "json5": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.0.tgz",
-      "integrity": "sha512-8Mh9h6xViijj36g7Dxi+Y4S6hNGV96vcJZr/SrlHh1LR/pEn/8j/+qIBbs44YKl69Lrfctp4QD+AdWLTMqEZAQ==",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.1.tgz",
+      "integrity": "sha512-l+3HXD0GEI3huGq1njuqtzYK8OYJyXMkOLtQ53pjWh89tvWS2h6l+1zMkYWqlb57+SiQodKZyvMEFb2X+KrFhQ==",
       "dev": true,
       "requires": {
         "minimist": "^1.2.0"
@@ -4812,6 +5089,27 @@
         "type-check": "~0.3.2"
       }
     },
+    "live-server": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/live-server/-/live-server-1.2.1.tgz",
+      "integrity": "sha512-Yn2XCVjErTkqnM3FfTmM7/kWy3zP7+cEtC7x6u+wUzlQ+1UW3zEYbbyJrc0jNDwiMDZI0m4a0i3dxlGHVyXczw==",
+      "dev": true,
+      "requires": {
+        "chokidar": "^2.0.4",
+        "colors": "^1.4.0",
+        "connect": "^3.6.6",
+        "cors": "^2.8.5",
+        "event-stream": "3.3.4",
+        "faye-websocket": "0.11.x",
+        "http-auth": "3.1.x",
+        "morgan": "^1.9.1",
+        "object-assign": "^4.1.1",
+        "opn": "^6.0.0",
+        "proxy-middleware": "^0.15.0",
+        "send": "^0.17.1",
+        "serve-index": "^1.9.1"
+      }
+    },
     "load-json-file": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/load-json-file/-/load-json-file-4.0.0.tgz",
@@ -4900,9 +5198,9 @@
       }
     },
     "magic-string": {
-      "version": "0.25.3",
-      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.3.tgz",
-      "integrity": "sha512-6QK0OpF/phMz0Q2AxILkX2mFhi7m+WMwTRg0LQKq/WBB0cDP4rYH3Wp4/d3OTXlrPLVJT/RFqj8tFeAR4nk8AA==",
+      "version": "0.25.4",
+      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.25.4.tgz",
+      "integrity": "sha512-oycWO9nEVAP2RVPbIoDoA4Y7LFIJ3xRYov93gAyJhZkET1tNuB0u7uWkZS2LpBWTJUWnmau/To8ECWRC+jKNfw==",
       "dev": true,
       "requires": {
         "sourcemap-codec": "^1.4.4"
@@ -4947,6 +5245,12 @@
       "integrity": "sha1-wyq9C9ZSXZsFFkW7TyasXcmKDb8=",
       "dev": true
     },
+    "map-stream": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/map-stream/-/map-stream-0.1.0.tgz",
+      "integrity": "sha1-5WqpTEyAVaFkBKBnS3jyFffI4ZQ=",
+      "dev": true
+    },
     "map-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/map-visit/-/map-visit-1.0.0.tgz",
@@ -5112,6 +5416,12 @@
         "to-regex": "^3.0.2"
       }
     },
+    "mime": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
+      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
+      "dev": true
+    },
     "mime-db": {
       "version": "1.40.0",
       "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.40.0.tgz",
@@ -5186,6 +5496,19 @@
       "integrity": "sha1-EUyUlnPiqKNenTV4hSeqN7Z52is=",
       "dev": true
     },
+    "morgan": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/morgan/-/morgan-1.9.1.tgz",
+      "integrity": "sha512-HQStPIV4y3afTiCYVxirakhlCfGkI161c76kKFca7Fk1JusM//Qeo1ej2XaMniiNeaZklMVrh3vTtIzpzwbpmA==",
+      "dev": true,
+      "requires": {
+        "basic-auth": "~2.0.0",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "on-finished": "~2.3.0",
+        "on-headers": "~1.0.1"
+      }
+    },
     "mri": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/mri/-/mri-1.1.4.tgz",
@@ -5230,6 +5553,12 @@
       "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=",
       "dev": true
     },
+    "negotiator": {
+      "version": "0.6.2",
+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
+      "integrity": "sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==",
+      "dev": true
+    },
     "neo-async": {
       "version": "2.6.1",
       "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.1.tgz",
@@ -5268,12 +5597,20 @@
       }
     },
     "node-releases": {
-      "version": "1.1.33",
-      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-1.1.33.tgz",
-      "integrity": "sha512-I0V30bWQEoHb+10W8oedVoUrdjW5wIkYm0w7vvcrPO95pZY738m1k77GF5sO0vKg5eXYg9oGtrMAETbgZGm11A==",
+      "version": "1.1.36",
+      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-1.1.36.tgz",
+      "integrity": "sha512-ggXhX6QGyJSjj3r+6ml2LqqC28XOWmKtpb+a15/Zpr9V3yoNazxJNlcQDS9bYaid5FReEWHEgToH1mwoUceWwg==",
       "dev": true,
       "requires": {
-        "semver": "^5.3.0"
+        "semver": "^6.3.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
       }
     },
     "normalize-package-data": {
@@ -5469,6 +5806,21 @@
         "has": "^1.0.3"
       }
     },
+    "on-finished": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.3.0.tgz",
+      "integrity": "sha1-IPEzZIGwg811M3mSoWlxqi2QaUc=",
+      "dev": true,
+      "requires": {
+        "ee-first": "1.1.1"
+      }
+    },
+    "on-headers": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/on-headers/-/on-headers-1.0.2.tgz",
+      "integrity": "sha512-pZAE+FJLoyITytdqK0U5s+FIpjN0JP3OzFi/u8Rx+EV5/W+JTWGXG8xFzevE7AjBfDqHv/8vL8qQsIhHnqRkrA==",
+      "dev": true
+    },
     "once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -5478,6 +5830,15 @@
         "wrappy": "1"
       }
     },
+    "opn": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/opn/-/opn-6.0.0.tgz",
+      "integrity": "sha512-I9PKfIZC+e4RXZ/qr1RhgyCnGgYX0UEIlXgWnCOVACIvFgaC9rz6Won7xbdhoHrd8IIhV7YEpHjreNUNkqCGkQ==",
+      "dev": true,
+      "requires": {
+        "is-wsl": "^1.1.0"
+      }
+    },
     "optimist": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/optimist/-/optimist-0.6.1.tgz",
@@ -5585,12 +5946,24 @@
       "integrity": "sha512-VrZ7eOd3T1Fk4XWNXMgiGBK/z0MG48BWG2uQNU4I72fkQuKUTZpl+u9k+CxEG0twMVzSmXEEz12z5Fnw1jIQFA==",
       "dev": true
     },
+    "parseurl": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
+      "integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==",
+      "dev": true
+    },
     "pascalcase": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/pascalcase/-/pascalcase-0.1.1.tgz",
       "integrity": "sha1-s2PlXoAGym/iF4TS2yK9FdeRfxQ=",
       "dev": true
     },
+    "path-dirname": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/path-dirname/-/path-dirname-1.0.2.tgz",
+      "integrity": "sha1-zDPSTVJeCZpTiMAzbG4yuRYGCeA=",
+      "dev": true
+    },
     "path-exists": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
@@ -5624,6 +5997,15 @@
         "pify": "^3.0.0"
       }
     },
+    "pause-stream": {
+      "version": "0.0.11",
+      "resolved": "https://registry.npmjs.org/pause-stream/-/pause-stream-0.0.11.tgz",
+      "integrity": "sha1-/lo0sMvOErWqaitAPuLnO2AvFEU=",
+      "dev": true,
+      "requires": {
+        "through": "~2.3"
+      }
+    },
     "performance-now": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
@@ -6327,6 +6709,12 @@
       "integrity": "sha512-VvivMrbvd2nKkiG38qjULzlc+4Vx4wm/whI9pQD35YrARNnhxeiRktSOhSukRLFNlzg6Br/cJPet5J/u19r/mg==",
       "dev": true
     },
+    "process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==",
+      "dev": true
+    },
     "promise.series": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/promise.series/-/promise.series-0.2.0.tgz",
@@ -6343,6 +6731,12 @@
         "sisteransi": "^1.0.3"
       }
     },
+    "proxy-middleware": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/proxy-middleware/-/proxy-middleware-0.15.0.tgz",
+      "integrity": "sha1-o/3xvvtzD5UZZYcqwvYHTGFHelY=",
+      "dev": true
+    },
     "psl": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/psl/-/psl-1.4.0.tgz",
@@ -6377,10 +6771,16 @@
       "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==",
       "dev": true
     },
+    "range-parser": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
+      "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==",
+      "dev": true
+    },
     "react-is": {
-      "version": "16.10.1",
-      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.10.1.tgz",
-      "integrity": "sha512-BXUMf9sIOPXXZWqr7+c5SeOKJykyVr2u0UDzEf4LNGc6taGkQe1A9DFD07umCIXz45RLr9oAAwZbAJ0Pkknfaw==",
+      "version": "16.10.2",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.10.2.tgz",
+      "integrity": "sha512-INBT1QEgtcCCgvccr5/86CfD71fw9EPmDxgiJX4I2Ddr6ZsV6iFXsuby+qWJPtmNuMY0zByTsG4468P7nHuNWA==",
       "dev": true
     },
     "read-pkg": {
@@ -6404,6 +6804,32 @@
         "read-pkg": "^3.0.0"
       }
     },
+    "readable-stream": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+      "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+      "dev": true,
+      "requires": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      }
+    },
+    "readdirp": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-2.2.1.tgz",
+      "integrity": "sha512-1JU/8q+VgFZyxwrJ+SVIOsh+KywWGpds3NTqikiKpDMZWScmAYyKIgqkO+ARvNWJfXeXR1zxz7aHF4u4CyH6vQ==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "micromatch": "^3.1.10",
+        "readable-stream": "^2.0.2"
+      }
+    },
     "realpath-native": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/realpath-native/-/realpath-native-1.1.0.tgz",
@@ -6650,9 +7076,9 @@
       }
     },
     "rollup": {
-      "version": "1.22.0",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.22.0.tgz",
-      "integrity": "sha512-x4l4ZrV/Mr/x/jvFTmwROdEAhbZjx16yDRTVSKWh/i4oJDuW2dVEbECT853mybYCz7BAitU8ElGlhx7dNjw3qQ==",
+      "version": "1.25.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.25.0.tgz",
+      "integrity": "sha512-tcf5ThhnhOUaNrxBSABvaaX9uC8hNxgyJpJmDIXaCkKHq/nPocaDz/4F/KBDiUpOt/ThvUxFrUq3XkyWiyXQiQ==",
       "dev": true,
       "requires": {
         "@types/estree": "*",
@@ -6943,12 +7369,82 @@
       "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
       "dev": true
     },
+    "send": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.17.1.tgz",
+      "integrity": "sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==",
+      "dev": true,
+      "requires": {
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "destroy": "~1.0.4",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "0.5.2",
+        "http-errors": "~1.7.2",
+        "mime": "1.6.0",
+        "ms": "2.1.1",
+        "on-finished": "~2.3.0",
+        "range-parser": "~1.2.1",
+        "statuses": "~1.5.0"
+      },
+      "dependencies": {
+        "ms": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
+          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
+          "dev": true
+        }
+      }
+    },
     "serialize-javascript": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-1.9.1.tgz",
       "integrity": "sha512-0Vb/54WJ6k5v8sSWN09S0ora+Hnr+cX40r9F170nT+mSkaxltoE/7R3OrIdBSUv1OoiobH1QoWQbCnAO+e8J1A==",
       "dev": true
     },
+    "serve-index": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/serve-index/-/serve-index-1.9.1.tgz",
+      "integrity": "sha1-03aNabHn2C5c4FD/9bRTvqEqkjk=",
+      "dev": true,
+      "requires": {
+        "accepts": "~1.3.4",
+        "batch": "0.6.1",
+        "debug": "2.6.9",
+        "escape-html": "~1.0.3",
+        "http-errors": "~1.6.2",
+        "mime-types": "~2.1.17",
+        "parseurl": "~1.3.2"
+      },
+      "dependencies": {
+        "http-errors": {
+          "version": "1.6.3",
+          "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+          "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
+          "dev": true,
+          "requires": {
+            "depd": "~1.1.2",
+            "inherits": "2.0.3",
+            "setprototypeof": "1.1.0",
+            "statuses": ">= 1.4.0 < 2"
+          }
+        },
+        "inherits": {
+          "version": "2.0.3",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+          "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
+          "dev": true
+        },
+        "setprototypeof": {
+          "version": "1.1.0",
+          "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
+          "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ==",
+          "dev": true
+        }
+      }
+    },
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
@@ -6978,6 +7474,12 @@
         }
       }
     },
+    "setprototypeof": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
+      "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw==",
+      "dev": true
+    },
     "shebang-command": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
@@ -7226,6 +7728,15 @@
       "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q==",
       "dev": true
     },
+    "split": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/split/-/split-0.3.3.tgz",
+      "integrity": "sha1-zQ7qXmOiEd//frDwkcQTPi0N0o8=",
+      "dev": true,
+      "requires": {
+        "through": "2"
+      }
+    },
     "split-string": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
@@ -7291,12 +7802,27 @@
         }
       }
     },
+    "statuses": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
+      "dev": true
+    },
     "stealthy-require": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/stealthy-require/-/stealthy-require-1.1.1.tgz",
       "integrity": "sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks=",
       "dev": true
     },
+    "stream-combiner": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.0.4.tgz",
+      "integrity": "sha1-TV5DPBhSYd3mI8o/RMWGvPXErRQ=",
+      "dev": true,
+      "requires": {
+        "duplexer": "~0.1.1"
+      }
+    },
     "string-hash": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/string-hash/-/string-hash-1.1.3.tgz",
@@ -7372,6 +7898,15 @@
         "function-bind": "^1.1.1"
       }
     },
+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
     "strip-ansi": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
@@ -7460,9 +7995,9 @@
       "dev": true
     },
     "terser": {
-      "version": "4.3.4",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.3.4.tgz",
-      "integrity": "sha512-Kcrn3RiW8NtHBP0ssOAzwa2MsIRQ8lJWiBG/K7JgqPlomA3mtb2DEmp4/hrUA+Jujx+WZ02zqd7GYD+QRBB/2Q==",
+      "version": "4.3.9",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.3.9.tgz",
+      "integrity": "sha512-NFGMpHjlzmyOtPL+fDw3G7+6Ueh/sz4mkaUYa4lJCxOPTNzd0Uj0aZJOmsDYoSQyfuVoWDMSWTPU3huyOm2zdA==",
       "dev": true,
       "requires": {
         "commander": "^2.20.0",
@@ -7488,6 +8023,12 @@
       "integrity": "sha1-iQN8vJLFarGJJua6TLsgDhVnKmo=",
       "dev": true
     },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
     "timsort": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/timsort/-/timsort-0.3.0.tgz",
@@ -7505,19 +8046,20 @@
       }
     },
     "tk-base": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/tk-base/-/tk-base-0.2.1.tgz",
-      "integrity": "sha512-oVFVHXYoknqLBSZRqJSg/+BrKAh24cMpXQyU/q0hH+dVPnd+uHQ1nsjE8U69phrYOSCWicVXH1CKfuaGtV0vWg==",
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/tk-base/-/tk-base-0.2.3.tgz",
+      "integrity": "sha512-A1ggx4ufNhThw3pSGO6FewnAepU6kaCRsHoWXIC31ktqRDIok1OFnQ3EmxisqtsXYclpiRv8P4mjaZziryySEA==",
       "dev": true,
       "requires": {
-        "@types/jest": "^24.0.18",
-        "@types/node": "^12.7.8",
+        "@types/jest": "^24.0.19",
+        "@types/node": "^12.7.12",
         "jest": "^24.9.0",
+        "live-server": "^1.2.1",
         "microbundle": "^0.12.0-next.6",
         "npm-run-all": "^4.1.5",
         "ts-jest": "^24.1.0",
         "ts-node": "^8.4.1",
-        "typescript": "^3.6.3"
+        "typescript": "^3.6.4"
       }
     },
     "tmpl": {
@@ -7574,6 +8116,12 @@
         "repeat-string": "^1.6.1"
       }
     },
+    "toidentifier": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
+      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==",
+      "dev": true
+    },
     "tough-cookie": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
@@ -7672,19 +8220,19 @@
       }
     },
     "typescript": {
-      "version": "3.6.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.3.tgz",
-      "integrity": "sha512-N7bceJL1CtRQ2RiG0AQME13ksR7DiuQh/QehubYcghzv20tnh+MQnQIuJddTmsbqYj+dztchykemz0zFzlvdQw==",
+      "version": "3.6.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.4.tgz",
+      "integrity": "sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg==",
       "dev": true
     },
     "uglify-js": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
-      "integrity": "sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==",
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.2.tgz",
+      "integrity": "sha512-+gh/xFte41GPrgSMJ/oJVq15zYmqr74pY9VoM69UzMzq9NFk4YDylclb1/bhEzZSaUQjbW5RvniHeq1cdtRYjw==",
       "dev": true,
       "optional": true,
       "requires": {
-        "commander": "~2.20.0",
+        "commander": "2.20.0",
         "source-map": "~0.6.1"
       }
     },
@@ -7746,6 +8294,18 @@
       "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
       "dev": true
     },
+    "unix-crypt-td-js": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unix-crypt-td-js/-/unix-crypt-td-js-1.0.0.tgz",
+      "integrity": "sha1-HAgkFQSBvHoB1J6Y8exmjYJBLzs=",
+      "dev": true
+    },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
+      "dev": true
+    },
     "unquote": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/unquote/-/unquote-1.1.1.tgz",
@@ -7792,6 +8352,12 @@
         }
       }
     },
+    "upath": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/upath/-/upath-1.2.0.tgz",
+      "integrity": "sha512-aZwGpamFO61g3OlfT7OQCHqhGnW43ieH9WZeP7QxN/G/jS4jfqUkZxoryvJgVPEcrl5NL/ggHsSmLMHuH64Lhg==",
+      "dev": true
+    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -7813,6 +8379,12 @@
       "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
       "dev": true
     },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
     "util.promisify": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
@@ -7823,6 +8395,12 @@
         "object.getownpropertydescriptors": "^2.0.3"
       }
     },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "dev": true
+    },
     "uuid": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
@@ -7839,6 +8417,12 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
+      "dev": true
+    },
     "vendors": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/vendors/-/vendors-1.0.3.tgz",
@@ -7886,6 +8470,23 @@
       "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
       "dev": true
     },
+    "websocket-driver": {
+      "version": "0.7.3",
+      "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.3.tgz",
+      "integrity": "sha512-bpxWlvbbB459Mlipc5GBzzZwhoZgGEZLuqPaR0INBGnPAY1vdBX6hPnoFXiw+3yWxDuHyQjO2oXTMyS8A5haFg==",
+      "dev": true,
+      "requires": {
+        "http-parser-js": ">=0.4.0 <0.4.11",
+        "safe-buffer": ">=5.1.0",
+        "websocket-extensions": ">=0.1.1"
+      }
+    },
+    "websocket-extensions": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/websocket-extensions/-/websocket-extensions-0.1.3.tgz",
+      "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg==",
+      "dev": true
+    },
     "whatwg-encoding": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
diff --git a/package.json b/package.json
index a8e80b7..fa0f3db 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tk-functional",
-  "version": "0.1.5",
+  "version": "0.2.0",
   "description": "Typescript/Javascript helpers for functional-style programming",
   "source": "src/index.ts",
   "main": "dist/tk-functional.umd.js",
@@ -18,7 +18,8 @@
     "prepublishOnly": "npm test",
     "dev": "run-p dev:*",
     "dev:test": "jest --watchAll",
-    "dev:build": "microbundle watch -f modern,umd"
+    "dev:build": "microbundle watch -f modern,umd",
+    "dev:serve": "live-server --host=localhost --port=5000 --no-browser dist"
   },
   "author": {
     "name": "Michaël Lemaire",
@@ -37,7 +38,7 @@
     "typescript"
   ],
   "devDependencies": {
-    "tk-base": "^0.2.1"
+    "tk-base": "^0.2.3"
   },
   "dependencies": {}
-}
\ No newline at end of file
+}
diff --git a/src/index.test.ts b/src/index.test.ts
index 222545f..6df142f 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -1,4 +1,4 @@
-import { always, and, attr, bool, cmp, fmap, identity, never, nn, nnu, nop, nu, or, partial, pipe } from "./index";
+import { always, and, attr, bool, cmp, fmap, identity, is, isinstance, never, nn, nnu, nop, nu, or, partial, pipe } from "./index";
 
 describe(nop, () => {
   it("does nothing", () => {
@@ -74,6 +74,38 @@ describe(or, () => {
   });
 });
 
+describe(is, () => {
+  it("checks for equality", () => {
+    const f = is(5);
+    expect(f(5)).toBe(true);
+    expect(f(4)).toBe(false);
+    expect(f("a" as any)).toBe(false);
+    expect(f(null as any)).toBe(false);
+    expect(f(undefined as any)).toBe(false);
+  });
+
+  it("applies strict equality", () => {
+    const obj: { x: number } = { x: 1 };
+    let f = is(obj);
+    expect(f(obj)).toBe(true);
+    expect(f({ x: 1 })).toBe(false);
+    expect(f({ y: 1 } as any)).toBe(false);
+  });
+});
+
+describe(isinstance, () => {
+  it("checks for subclasses", () => {
+    class A { }
+    class A1 extends A { }
+    class A2 extends A { }
+    class B { }
+
+    const f: any[] = [5, null, undefined, new A, new A1, new B, new A2];
+    const result = f.filter(isinstance(A));
+    expect(result).toEqual([f[3], f[4], f[6]]);
+  });
+});
+
 describe(pipe, () => {
   it("pipes two functions", () => {
     const f = pipe((x: number) => x * 2, (x: number) => x + 1);
diff --git a/src/index.ts b/src/index.ts
index e9d1fe0..eadd832 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -77,6 +77,20 @@ export function or<A extends any[]>(...predicates: ((...args: A) => boolean)[]):
   }
 }
 
+/**
+ * Get a function to check the strict equality with a reference
+ */
+export function is<T, S extends T>(ref: T): (input: S) => input is Extract<T, S> {
+  return (x): x is Extract<T, S> => x === ref;
+}
+
+/**
+ * Get a function to check that inputs are instances of a given type
+ */
+export function isinstance<T, S extends T>(ref: { new(...args: any[]): T }): (input: S) => input is Extract<T, S> {
+  return (x): x is Extract<T, S> => x instanceof ref;
+}
+
 /**
  * Pipe the result of a function as first parameter of another, to create a new function
  */
diff --git a/tsconfig.json b/tsconfig.json
index 0633ca2..4dd3dd8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,5 +12,10 @@
       "dom",
       "es6"
     ]
-  }
+  },
+  "exclude": [
+    "node_modules",
+    "dist",
+    "src/**/*.test.ts"
+  ]
 }