Repository: cinar/indicatorts (ts)

Issue:
RSI returns `NaN` array
## Describe the bug

`customRsi` / `rsi` returns `NaN` array.

## To Reproduce

Run:

```javascript
customRsi(14, Array.from(Array(100).keys()))
```

## Expected behavior

RSI should return expected results.


Pull request description:
RSI returns `NaN` array
# Describe Request

RSI returns `NaN` array

Fixed #102 

# Change Type

Bug fix.


Patch:
diff --git a/package-lock.json b/package-lock.json
index 0421c6b..a8744ab 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1225,14 +1225,14 @@
       "dev": true
     },
     "node_modules/@typescript-eslint/eslint-plugin": {
-      "version": "5.28.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-5.28.0.tgz",
-      "integrity": "sha512-DXVU6Cg29H2M6EybqSg2A+x8DgO9TCUBRp4QEXQHJceLS7ogVDP0g3Lkg/SZCqcvkAP/RruuQqK0gdlkgmhSUA==",
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-5.29.0.tgz",
+      "integrity": "sha512-kgTsISt9pM53yRFQmLZ4npj99yGl3x3Pl7z4eA66OuTzAGC4bQB5H5fuLwPnqTKU3yyrrg4MIhjF17UYnL4c0w==",
       "dev": true,
       "dependencies": {
-        "@typescript-eslint/scope-manager": "5.28.0",
-        "@typescript-eslint/type-utils": "5.28.0",
-        "@typescript-eslint/utils": "5.28.0",
+        "@typescript-eslint/scope-manager": "5.29.0",
+        "@typescript-eslint/type-utils": "5.29.0",
+        "@typescript-eslint/utils": "5.29.0",
         "debug": "^4.3.4",
         "functional-red-black-tree": "^1.0.1",
         "ignore": "^5.2.0",
@@ -1257,15 +1257,62 @@
         }
       }
     },
+    "node_modules/@typescript-eslint/eslint-plugin/node_modules/@typescript-eslint/scope-manager": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-5.29.0.tgz",
+      "integrity": "sha512-etbXUT0FygFi2ihcxDZjz21LtC+Eps9V2xVx09zFoN44RRHPrkMflidGMI+2dUs821zR1tDS6Oc9IXxIjOUZwA==",
+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/visitor-keys": "5.29.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "node_modules/@typescript-eslint/eslint-plugin/node_modules/@typescript-eslint/types": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-5.29.0.tgz",
+      "integrity": "sha512-X99VbqvAXOMdVyfFmksMy3u8p8yoRGITgU1joBJPzeYa0rhdf5ok9S56/itRoUSh99fiDoMtarSIJXo7H/SnOg==",
+      "dev": true,
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "node_modules/@typescript-eslint/eslint-plugin/node_modules/@typescript-eslint/visitor-keys": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-5.29.0.tgz",
+      "integrity": "sha512-Hpb/mCWsjILvikMQoZIE3voc9wtQcS0A9FUw3h8bhr9UxBdtI/tw1ZDZUOXHXLOVMedKCH5NxyzATwnU78bWCQ==",
+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "5.29.0",
+        "eslint-visitor-keys": "^3.3.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
     "node_modules/@typescript-eslint/parser": {
-      "version": "5.28.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-5.28.0.tgz",
-      "integrity": "sha512-ekqoNRNK1lAcKhZESN/PdpVsWbP9jtiNqzFWkp/yAUdZvJalw2heCYuqRmM5eUJSIYEkgq5sGOjq+ZqsLMjtRA==",
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-5.29.0.tgz",
+      "integrity": "sha512-ruKWTv+x0OOxbzIw9nW5oWlUopvP/IQDjB5ZqmTglLIoDTctLlAJpAQFpNPJP/ZI7hTT9sARBosEfaKbcFuECw==",
       "dev": true,
       "dependencies": {
-        "@typescript-eslint/scope-manager": "5.28.0",
-        "@typescript-eslint/types": "5.28.0",
-        "@typescript-eslint/typescript-estree": "5.28.0",
+        "@typescript-eslint/scope-manager": "5.29.0",
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/typescript-estree": "5.29.0",
         "debug": "^4.3.4"
       },
       "engines": {
@@ -1284,6 +1331,80 @@
         }
       }
     },
+    "node_modules/@typescript-eslint/parser/node_modules/@typescript-eslint/scope-manager": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-5.29.0.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/visitor-keys": "5.29.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "node_modules/@typescript-eslint/parser/node_modules/@typescript-eslint/types": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-5.29.0.tgz",
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+      "dev": true,
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "node_modules/@typescript-eslint/parser/node_modules/@typescript-eslint/typescript-estree": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-5.29.0.tgz",
+      "integrity": "sha512-mQvSUJ/JjGBdvo+1LwC+GY2XmSYjK1nAaVw2emp/E61wEVYEyibRHCqm1I1vEKbXCpUKuW4G7u9ZCaZhJbLoNQ==",
+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/visitor-keys": "5.29.0",
+        "debug": "^4.3.4",
+        "globby": "^11.1.0",
+        "is-glob": "^4.0.3",
+        "semver": "^7.3.7",
+        "tsutils": "^3.21.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@typescript-eslint/parser/node_modules/@typescript-eslint/visitor-keys": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-5.29.0.tgz",
+      "integrity": "sha512-Hpb/mCWsjILvikMQoZIE3voc9wtQcS0A9FUw3h8bhr9UxBdtI/tw1ZDZUOXHXLOVMedKCH5NxyzATwnU78bWCQ==",
+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "5.29.0",
+        "eslint-visitor-keys": "^3.3.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
     "node_modules/@typescript-eslint/scope-manager": {
       "version": "5.28.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-5.28.0.tgz",
@@ -1302,12 +1423,12 @@
       }
     },
     "node_modules/@typescript-eslint/type-utils": {
-      "version": "5.28.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-5.28.0.tgz",
-      "integrity": "sha512-SyKjKh4CXPglueyC6ceAFytjYWMoPHMswPQae236zqe1YbhvCVQyIawesYywGiu98L9DwrxsBN69vGIVxJ4mQQ==",
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-5.29.0.tgz",
+      "integrity": "sha512-JK6bAaaiJozbox3K220VRfCzLa9n0ib/J+FHIwnaV3Enw/TO267qe0pM1b1QrrEuy6xun374XEAsRlA86JJnyg==",
       "dev": true,
       "dependencies": {
-        "@typescript-eslint/utils": "5.28.0",
+        "@typescript-eslint/utils": "5.29.0",
         "debug": "^4.3.4",
         "tsutils": "^3.21.0"
       },
@@ -1368,15 +1489,15 @@
       }
     },
     "node_modules/@typescript-eslint/utils": {
-      "version": "5.28.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-5.28.0.tgz",
-      "integrity": "sha512-E60N5L0fjv7iPJV3UGc4EC+A3Lcj4jle9zzR0gW7vXhflO7/J29kwiTGITA2RlrmPokKiZbBy2DgaclCaEUs6g==",
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-5.29.0.tgz",
+      "integrity": "sha512-3Eos6uP1nyLOBayc/VUdKZikV90HahXE5Dx9L5YlSd/7ylQPXhLk1BYb29SDgnBnTp+jmSZUU0QxUiyHgW4p7A==",
       "dev": true,
       "dependencies": {
         "@types/json-schema": "^7.0.9",
-        "@typescript-eslint/scope-manager": "5.28.0",
-        "@typescript-eslint/types": "5.28.0",
-        "@typescript-eslint/typescript-estree": "5.28.0",
+        "@typescript-eslint/scope-manager": "5.29.0",
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/typescript-estree": "5.29.0",
         "eslint-scope": "^5.1.1",
         "eslint-utils": "^3.0.0"
       },
@@ -1391,6 +1512,80 @@
         "eslint": "^6.0.0 || ^7.0.0 || ^8.0.0"
       }
     },
+    "node_modules/@typescript-eslint/utils/node_modules/@typescript-eslint/scope-manager": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-5.29.0.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/visitor-keys": "5.29.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "node_modules/@typescript-eslint/utils/node_modules/@typescript-eslint/types": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-5.29.0.tgz",
+      "integrity": "sha512-X99VbqvAXOMdVyfFmksMy3u8p8yoRGITgU1joBJPzeYa0rhdf5ok9S56/itRoUSh99fiDoMtarSIJXo7H/SnOg==",
+      "dev": true,
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
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+    "node_modules/@typescript-eslint/utils/node_modules/@typescript-eslint/typescript-estree": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-5.29.0.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/visitor-keys": "5.29.0",
+        "debug": "^4.3.4",
+        "globby": "^11.1.0",
+        "is-glob": "^4.0.3",
+        "semver": "^7.3.7",
+        "tsutils": "^3.21.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@typescript-eslint/utils/node_modules/@typescript-eslint/visitor-keys": {
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-5.29.0.tgz",
+      "integrity": "sha512-Hpb/mCWsjILvikMQoZIE3voc9wtQcS0A9FUw3h8bhr9UxBdtI/tw1ZDZUOXHXLOVMedKCH5NxyzATwnU78bWCQ==",
+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "5.29.0",
+        "eslint-visitor-keys": "^3.3.0"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
     "node_modules/@typescript-eslint/utils/node_modules/eslint-scope": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.1.tgz",
@@ -4587,9 +4782,9 @@
       }
     },
     "node_modules/rollup": {
-      "version": "2.75.6",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.75.6.tgz",
-      "integrity": "sha512-OEf0TgpC9vU6WGROJIk1JA3LR5vk/yvqlzxqdrE2CzzXnqKXNzbAwlWUXis8RS3ZPe7LAq+YUxsRa0l3r27MLA==",
+      "version": "2.75.7",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.75.7.tgz",
+      "integrity": "sha512-VSE1iy0eaAYNCxEXaleThdFXqZJ42qDBatAwrfnPlENEZ8erQ+0LYX4JXOLPceWfZpV1VtZwZ3dFCuOZiSyFtQ==",
       "dev": true,
       "bin": {
         "rollup": "dist/bin/rollup"
@@ -6470,32 +6665,103 @@
       "dev": true
     },
     "@typescript-eslint/eslint-plugin": {
-      "version": "5.28.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-5.28.0.tgz",
-      "integrity": "sha512-DXVU6Cg29H2M6EybqSg2A+x8DgO9TCUBRp4QEXQHJceLS7ogVDP0g3Lkg/SZCqcvkAP/RruuQqK0gdlkgmhSUA==",
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-5.29.0.tgz",
+      "integrity": "sha512-kgTsISt9pM53yRFQmLZ4npj99yGl3x3Pl7z4eA66OuTzAGC4bQB5H5fuLwPnqTKU3yyrrg4MIhjF17UYnL4c0w==",
       "dev": true,
       "requires": {
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-        "@typescript-eslint/type-utils": "5.28.0",
-        "@typescript-eslint/utils": "5.28.0",
+        "@typescript-eslint/scope-manager": "5.29.0",
+        "@typescript-eslint/type-utils": "5.29.0",
+        "@typescript-eslint/utils": "5.29.0",
         "debug": "^4.3.4",
         "functional-red-black-tree": "^1.0.1",
         "ignore": "^5.2.0",
         "regexpp": "^3.2.0",
         "semver": "^7.3.7",
         "tsutils": "^3.21.0"
+      },
+      "dependencies": {
+        "@typescript-eslint/scope-manager": {
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+          "dev": true
+        },
+        "@typescript-eslint/visitor-keys": {
+          "version": "5.29.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-5.29.0.tgz",
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+          "dev": true,
+          "requires": {
+            "@typescript-eslint/types": "5.29.0",
+            "eslint-visitor-keys": "^3.3.0"
+          }
+        }
       }
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       "dev": true,
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-        "@typescript-eslint/types": "5.28.0",
-        "@typescript-eslint/typescript-estree": "5.28.0",
+        "@typescript-eslint/scope-manager": "5.29.0",
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/typescript-estree": "5.29.0",
         "debug": "^4.3.4"
+      },
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+          "dev": true
+        },
+        "@typescript-eslint/typescript-estree": {
+          "version": "5.29.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-5.29.0.tgz",
+          "integrity": "sha512-mQvSUJ/JjGBdvo+1LwC+GY2XmSYjK1nAaVw2emp/E61wEVYEyibRHCqm1I1vEKbXCpUKuW4G7u9ZCaZhJbLoNQ==",
+          "dev": true,
+          "requires": {
+            "@typescript-eslint/types": "5.29.0",
+            "@typescript-eslint/visitor-keys": "5.29.0",
+            "debug": "^4.3.4",
+            "globby": "^11.1.0",
+            "is-glob": "^4.0.3",
+            "semver": "^7.3.7",
+            "tsutils": "^3.21.0"
+          }
+        },
+        "@typescript-eslint/visitor-keys": {
+          "version": "5.29.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-5.29.0.tgz",
+          "integrity": "sha512-Hpb/mCWsjILvikMQoZIE3voc9wtQcS0A9FUw3h8bhr9UxBdtI/tw1ZDZUOXHXLOVMedKCH5NxyzATwnU78bWCQ==",
+          "dev": true,
+          "requires": {
+            "@typescript-eslint/types": "5.29.0",
+            "eslint-visitor-keys": "^3.3.0"
+          }
+        }
       }
     },
     "@typescript-eslint/scope-manager": {
@@ -6509,12 +6775,12 @@
       }
     },
     "@typescript-eslint/type-utils": {
-      "version": "5.28.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-5.28.0.tgz",
-      "integrity": "sha512-SyKjKh4CXPglueyC6ceAFytjYWMoPHMswPQae236zqe1YbhvCVQyIawesYywGiu98L9DwrxsBN69vGIVxJ4mQQ==",
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/type-utils/-/type-utils-5.29.0.tgz",
+      "integrity": "sha512-JK6bAaaiJozbox3K220VRfCzLa9n0ib/J+FHIwnaV3Enw/TO267qe0pM1b1QrrEuy6xun374XEAsRlA86JJnyg==",
       "dev": true,
       "requires": {
-        "@typescript-eslint/utils": "5.28.0",
+        "@typescript-eslint/utils": "5.29.0",
         "debug": "^4.3.4",
         "tsutils": "^3.21.0"
       }
@@ -6541,19 +6807,60 @@
       }
     },
     "@typescript-eslint/utils": {
-      "version": "5.28.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-5.28.0.tgz",
-      "integrity": "sha512-E60N5L0fjv7iPJV3UGc4EC+A3Lcj4jle9zzR0gW7vXhflO7/J29kwiTGITA2RlrmPokKiZbBy2DgaclCaEUs6g==",
+      "version": "5.29.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-5.29.0.tgz",
+      "integrity": "sha512-3Eos6uP1nyLOBayc/VUdKZikV90HahXE5Dx9L5YlSd/7ylQPXhLk1BYb29SDgnBnTp+jmSZUU0QxUiyHgW4p7A==",
       "dev": true,
       "requires": {
         "@types/json-schema": "^7.0.9",
-        "@typescript-eslint/scope-manager": "5.28.0",
-        "@typescript-eslint/types": "5.28.0",
-        "@typescript-eslint/typescript-estree": "5.28.0",
+        "@typescript-eslint/scope-manager": "5.29.0",
+        "@typescript-eslint/types": "5.29.0",
+        "@typescript-eslint/typescript-estree": "5.29.0",
         "eslint-scope": "^5.1.1",
         "eslint-utils": "^3.0.0"
       },
       "dependencies": {
+        "@typescript-eslint/scope-manager": {
+          "version": "5.29.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-5.29.0.tgz",
+          "integrity": "sha512-etbXUT0FygFi2ihcxDZjz21LtC+Eps9V2xVx09zFoN44RRHPrkMflidGMI+2dUs821zR1tDS6Oc9IXxIjOUZwA==",
+          "dev": true,
+          "requires": {
+            "@typescript-eslint/types": "5.29.0",
+            "@typescript-eslint/visitor-keys": "5.29.0"
+          }
+        },
+        "@typescript-eslint/types": {
+          "version": "5.29.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-5.29.0.tgz",
+          "integrity": "sha512-X99VbqvAXOMdVyfFmksMy3u8p8yoRGITgU1joBJPzeYa0rhdf5ok9S56/itRoUSh99fiDoMtarSIJXo7H/SnOg==",
+          "dev": true
+        },
+        "@typescript-eslint/typescript-estree": {
+          "version": "5.29.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-5.29.0.tgz",
+          "integrity": "sha512-mQvSUJ/JjGBdvo+1LwC+GY2XmSYjK1nAaVw2emp/E61wEVYEyibRHCqm1I1vEKbXCpUKuW4G7u9ZCaZhJbLoNQ==",
+          "dev": true,
+          "requires": {
+            "@typescript-eslint/types": "5.29.0",
+            "@typescript-eslint/visitor-keys": "5.29.0",
+            "debug": "^4.3.4",
+            "globby": "^11.1.0",
+            "is-glob": "^4.0.3",
+            "semver": "^7.3.7",
+            "tsutils": "^3.21.0"
+          }
+        },
+        "@typescript-eslint/visitor-keys": {
+          "version": "5.29.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-5.29.0.tgz",
+          "integrity": "sha512-Hpb/mCWsjILvikMQoZIE3voc9wtQcS0A9FUw3h8bhr9UxBdtI/tw1ZDZUOXHXLOVMedKCH5NxyzATwnU78bWCQ==",
+          "dev": true,
+          "requires": {
+            "@typescript-eslint/types": "5.29.0",
+            "eslint-visitor-keys": "^3.3.0"
+          }
+        },
         "eslint-scope": {
           "version": "5.1.1",
           "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-5.1.1.tgz",
@@ -8954,9 +9261,9 @@
       }
     },
     "rollup": {
-      "version": "2.75.6",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.75.6.tgz",
-      "integrity": "sha512-OEf0TgpC9vU6WGROJIk1JA3LR5vk/yvqlzxqdrE2CzzXnqKXNzbAwlWUXis8RS3ZPe7LAq+YUxsRa0l3r27MLA==",
+      "version": "2.75.7",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.75.7.tgz",
+      "integrity": "sha512-VSE1iy0eaAYNCxEXaleThdFXqZJ42qDBatAwrfnPlENEZ8erQ+0LYX4JXOLPceWfZpV1VtZwZ3dFCuOZiSyFtQ==",
       "dev": true,
       "requires": {
         "fsevents": "~2.3.2"
diff --git a/src/indicator/momentum/rsi.ts b/src/indicator/momentum/rsi.ts
index e4251b7..64a5dee 100644
--- a/src/indicator/momentum/rsi.ts
+++ b/src/indicator/momentum/rsi.ts
@@ -19,6 +19,8 @@ export function customRsi(period: number, closings: number[]): number[] {
   const gains = new Array<number>(closings.length);
   const losses = new Array<number>(closings.length);
 
+  gains[0] = losses[0] = 0;
+
   for (let i = 1; i < closings.length; i++) {
     const difference = closings[i] - closings[i - 1];
 
@@ -37,7 +39,9 @@ export function customRsi(period: number, closings: number[]): number[] {
   const r = new Array<number>(closings.length);
   const rs = new Array<number>(closings.length);
 
-  for (let i = 0; i < closings.length; i++) {
+  r[0] = rs[0] = 0;
+
+  for (let i = 1; i < closings.length; i++) {
     rs[i] = meanGains[i] / meanLosses[i];
     r[i] = 100 - 100 / (1 + rs[i]);
   }
diff --git a/src/indicator/volatility/bollingerBandsWidth.ts b/src/indicator/volatility/bollingerBandsWidth.ts
index ea149fd..8b82640 100644
--- a/src/indicator/volatility/bollingerBandsWidth.ts
+++ b/src/indicator/volatility/bollingerBandsWidth.ts
@@ -29,10 +29,7 @@ export interface BollingerBandsWidth {
  * @return bollinger bands width result.
  */
 export function bollingerBandsWidth(bb: BollingerBands): BollingerBandsWidth {
-  const bandWidth = divide(
-    subtract(bb.upperBand, bb.lowerBand),
-    bb.middleBand
-  );
+  const bandWidth = divide(subtract(bb.upperBand, bb.lowerBand), bb.middleBand);
 
   const bandWidthEma90 = ema(PERIOD, bandWidth);
 
diff --git a/src/indicator/volatility/projectionOscillator.ts b/src/indicator/volatility/projectionOscillator.ts
index 183e1fa..8a01751 100644
--- a/src/indicator/volatility/projectionOscillator.ts
+++ b/src/indicator/volatility/projectionOscillator.ts
@@ -58,10 +58,7 @@ export function projectionOscillator(
   const pu = mmax(period, vHighs);
   const pl = mmin(period, vLows);
 
-  const po = divide(
-    multiplyBy(100, subtract(closings, pl)),
-    subtract(pu, pl)
-  );
+  const po = divide(multiplyBy(100, subtract(closings, pl)), subtract(pu, pl));
   const spo = ema(smooth, po);
 
   return {


Test patch:
diff --git a/src/indicator/momentum/rsi.test.ts b/src/indicator/momentum/rsi.test.ts
new file mode 100644
index 0000000..6b0aa3d
--- /dev/null
+++ b/src/indicator/momentum/rsi.test.ts
@@ -0,0 +1,22 @@
+// Copyright (c) 2022 Onur Cinar. All Rights Reserved.
+// https://github.com/cinar/indicatorts
+
+import { deepStrictEqual } from 'assert';
+import { roundDigitsAll } from '../../helper/numArray';
+import { customRsi } from './rsi';
+
+describe('Relative Strength Index (RSI)', () => {
+  it('should be able to compute the custom RSI', () => {
+    const closings = [
+      10, 12, 11, 11, 14, 16, 18, 17, 18, 19, 16, 14, 14, 15, 16, 19, 20, 22,
+    ];
+
+    const expected = [
+      0, 100, 66.67, 66.67, 83.33, 87.5, 90, 81.82, 83.33, 84.62, 68.75, 61.11,
+      61.11, 63.16, 65.13, 70.28, 71.78, 74.54,
+    ];
+
+    const actual = customRsi(14, closings);
+    deepStrictEqual(roundDigitsAll(2, actual), expected);
+  });
+});