From b3178d28012c05ed91e785d2d7b423cd7e68d793 Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Wed, 25 Sep 2019 10:25:59 +0100
Subject: [PATCH 01/14] Add changed property

---
 CHANGELOG.md      |  4 ++++
 README.md         |  6 +++++-
 index.js          | 15 ++++++++++++---
 package-lock.json |  5 +++++
 package.json      |  3 ++-
 test.js           | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 74 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa71bd9..95d92a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to this project are documented in this file.
 
+## Unreleased
+
+- Added: `changed` property.
+
 ## 0.1.3
 
 - Added: `payload` and `method` arguments.
diff --git a/README.md b/README.md
index 0ebd3e4..755575a 100755
--- a/README.md
+++ b/README.md
@@ -13,7 +13,10 @@ If you need a simple way to load data quickly this is for you. It allows you to
 You can optionally specify a polling interval and manually trigger a refresh. It also gracefully cancels any open requests if you decide to change the URL and restarts timers if the polling interval changes.
 
 ```javascript
-const { data, loading, error, refresh } = useApi("https://some-api.com", 10000);
+const { data, loading, changed, error, refresh } = useApi(
+  "https://some-api.com",
+  10000
+);
 ```
 
 ## Installation
@@ -85,6 +88,7 @@ const PeopleSearch = () = {
 
 - `data`: The data returned from the API.
 - `loading`: A boolean signifying if the data is currently being loaded.
+- `changed`: A boolean signifying if the data changed during the last load.
 - `error`: A string representation of an error if it occurred during loading.
 - `refresh`: A function to call to re-request the data.
 
diff --git a/index.js b/index.js
index 3979d0f..c3185b6 100755
--- a/index.js
+++ b/index.js
@@ -1,10 +1,13 @@
 const { useEffect, useState } = require("react");
 const axios = require("axios");
+const isEqual = require("lodash.isequal");
 
 const { CancelToken } = axios;
 
 const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
+  const [changed, setChanged] = useState(false);
   const [data, setData] = useState({});
+  const [lastData, setLastData] = useState({});
   const [error, setError] = useState(null);
   const [loading, setLoading] = useState(true);
   const [poll, setPoll] = useState(0);
@@ -29,6 +32,8 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
     // Set loading to be true
     setLoading(true);
 
+    setChanged(false);
+
     // Make call to the API
     axios(apiEndpoint, {
       method,
@@ -39,8 +44,12 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
       .then(response => {
         // Make sure there are no errors reported
         setError(null);
-        // Set the recieved data
-        setData(response.data);
+        // Set the received data ONLY IF its changed, redraw performance gain!
+        if (!isEqual(response.data, lastData)) {
+          setChanged(true);
+          setLastData(response.data);
+          setData(response.data);
+        }
       })
       .catch(thrown => {
         // Only error on genuine errors, not cancellations
@@ -61,7 +70,7 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
     };
   }, [poll, apiEndpoint, pollInterval]);
 
-  return { data, loading, error, refresh };
+  return { data, loading, changed, error, refresh };
 };
 
 module.exports = useApi;
diff --git a/package-lock.json b/package-lock.json
index e81dc21..2d847e2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3386,6 +3386,11 @@
       "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
       "dev": true
     },
+    "lodash.isequal": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/lodash.isequal/-/lodash.isequal-4.5.0.tgz",
+      "integrity": "sha1-QVxEePK8wwEgwizhDtMib30+GOA="
+    },
     "lodash.sortby": {
       "version": "4.7.0",
       "resolved": "https://registry.npmjs.org/lodash.sortby/-/lodash.sortby-4.7.0.tgz",
diff --git a/package.json b/package.json
index 744beec..ba9bdf1 100755
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "react-test-renderer": "^16.9.0"
   },
   "dependencies": {
-    "axios": "^0.19.0"
+    "axios": "^0.19.0",
+    "lodash.isequal": "^4.5.0"
   }
 }
diff --git a/test.js b/test.js
index 1c454a1..c0f84de 100755
--- a/test.js
+++ b/test.js
@@ -247,4 +247,50 @@ describe("performs requests", () => {
     expect(result.current.error).toEqual("Request failed with status code 404");
     expect(result.current.loading).toBeFalsy();
   });
+
+  it("notified when data has changed", async () => {
+    mock.onGet(url).reply(200, "response");
+
+    const { result, waitForNextUpdate } = renderHook(() => useApi(url, 0));
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response");
+    expect(result.current.loading).toBeFalsy();
+
+    mock.onGet(url).reply(200, "response2");
+
+    act(() => {
+      result.current.refresh();
+    });
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response2");
+    expect(result.current.changed).toBeTruthy();
+    expect(result.current.loading).toBeFalsy();
+  });
+
+  it("does not notify when data has not changed", async () => {
+    mock.onGet(url).reply(200, "response");
+
+    const { result, waitForNextUpdate } = renderHook(() => useApi(url, 0));
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response");
+    expect(result.current.loading).toBeFalsy();
+
+    mock.onGet(url).reply(200, "response");
+
+    act(() => {
+      result.current.refresh();
+    });
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response");
+    expect(result.current.changed).toBeFalsy();
+    expect(result.current.loading).toBeFalsy();
+  });
 });

From 44ea12b419006b032f9a131b2e29adeb4c48c29b Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Wed, 25 Sep 2019 11:54:52 +0100
Subject: [PATCH 02/14] Added linting

---
 .eslintignore                |    5 +
 .eslintrc                    |   20 +
 .github/workflows/nodejs.yml |    1 +
 .prettierignore              |    5 +
 index.js                     |    4 +-
 package-lock.json            | 1339 +++++++++++++++++++++++++++++++++-
 package.json                 |   17 +-
 test.js                      |    4 +-
 8 files changed, 1384 insertions(+), 11 deletions(-)
 create mode 100644 .eslintignore
 create mode 100644 .eslintrc
 create mode 100644 .prettierignore

diff --git a/.eslintignore b/.eslintignore
new file mode 100644
index 0000000..879f612
--- /dev/null
+++ b/.eslintignore
@@ -0,0 +1,5 @@
+node_modules
+coverage
+dist
+public
+tmp
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..58ce448
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,20 @@
+{
+  "env": {
+    "browser": true,
+    "node": true,
+    "es6": true,
+    "jest": true
+  },
+  "extends": ["eslint:recommended", "plugin:react/recommended"],
+  "plugins": ["react", "react-hooks"],
+  "parser": "babel-eslint",
+  "rules": {
+    "react-hooks/rules-of-hooks": "error",
+    "react-hooks/exhaustive-deps": "warn"
+  },
+  "settings": {
+    "react": {
+      "version": "detect"
+    }
+  }
+}
diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index a30c620..f758f41 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -25,6 +25,7 @@ jobs:
       - name: npm install and test
         run: |
           npm install
+          npm run lint
           npm test -- --ci
         env:
           CI: true
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..879f612
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,5 @@
+node_modules
+coverage
+dist
+public
+tmp
diff --git a/index.js b/index.js
index c3185b6..952548a 100755
--- a/index.js
+++ b/index.js
@@ -12,14 +12,14 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
   const [loading, setLoading] = useState(true);
   const [poll, setPoll] = useState(0);
 
+  if (method.toLowerCase) method = method.toLowerCase();
+
   // Function to force a refresh
   const refresh = () => setPoll(poll + 1);
 
   useEffect(() => {
     let timeout;
 
-    if (method.toLowerCase) method = method.toLowerCase();
-
     if (!["get", "post"].includes(method)) {
       setLoading(false);
       setError("Invalid request method type, must be either post or get.");
diff --git a/package-lock.json b/package-lock.json
index 2d847e2..3f48bd8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -419,6 +419,22 @@
         "@types/yargs": "^13.0.0"
       }
     },
+    "@mrmlnc/readdir-enhanced": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
+      "integrity": "sha512-bPHp6Ji8b41szTOcaP63VlnbbO5Ny6dwAATtY6JTjh5N2OLrb5Qk/Th5cRkRQhkWCt+EJsYrNB0MiL+Gpn6e3g==",
+      "dev": true,
+      "requires": {
+        "call-me-maybe": "^1.0.1",
+        "glob-to-regexp": "^0.3.0"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-1.1.3.tgz",
+      "integrity": "sha512-shAmDyaQC4H92APFoIaVDHCx5bStIocgvbwQyxPRrbUY20V1EYTbSDchWbuwlMG3V17cprZhA6+78JfB+3DTPw==",
+      "dev": true
+    },
     "@testing-library/react-hooks": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@testing-library/react-hooks/-/react-hooks-2.0.1.tgz",
@@ -471,6 +487,23 @@
         "@babel/types": "^7.3.0"
       }
     },
+    "@types/events": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@types/events/-/events-3.0.0.tgz",
+      "integrity": "sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==",
+      "dev": true
+    },
+    "@types/glob": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.1.tgz",
+      "integrity": "sha512-1Bh06cbWJUHMC97acuD6UMG29nMt0Aqz1vF3guLfG+kHHJhy3AyohZFFxYk2f7Q1SQIrNwvncxAE0N/9s70F2w==",
+      "dev": true,
+      "requires": {
+        "@types/events": "*",
+        "@types/minimatch": "*",
+        "@types/node": "*"
+      }
+    },
     "@types/istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -496,6 +529,18 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "@types/minimatch": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
+      "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "12.7.7",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.7.tgz",
+      "integrity": "sha512-4jUncNe2tj1nmrO/34PsRpZqYVnRV1svbU78cKhuQKkMntKB/AmdLyGgswcZKjFHEHGpiY8pVD8CuVI55nP54w==",
+      "dev": true
+    },
     "@types/prop-types": {
       "version": "15.7.2",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.2.tgz",
@@ -564,6 +609,12 @@
         "acorn-walk": "^6.0.1"
       }
     },
+    "acorn-jsx": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.2.tgz",
+      "integrity": "sha512-tiNTrP1MP0QrChmD2DdupCr6HWSFeKVw5d/dHTu4Y7rkAkRhU/Dt7dphAfIUyxtHpl/eBVip5uTNSpQJHylpAw==",
+      "dev": true
+    },
     "acorn-walk": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.2.0.tgz",
@@ -613,6 +664,15 @@
         "normalize-path": "^2.1.1"
       }
     },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -637,6 +697,31 @@
       "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
       "dev": true
     },
+    "array-includes": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
+      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.7.0"
+      }
+    },
+    "array-union": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+      "dev": true,
+      "requires": {
+        "array-uniq": "^1.0.1"
+      }
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
+      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
+      "dev": true
+    },
     "array-unique": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
@@ -718,6 +803,20 @@
         "deep-equal": "^1.0.1"
       }
     },
+    "babel-eslint": {
+      "version": "10.0.3",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-10.0.3.tgz",
+      "integrity": "sha512-z3U7eMY6r/3f3/JB9mTsLjyxrv0Yb1zb8PCWCLpguxfCzBIZUwy23R1t/XKewP+8mEN2Ck8Dtr4q20z6ce6SoA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.0.0",
+        "@babel/traverse": "^7.0.0",
+        "@babel/types": "^7.0.0",
+        "eslint-visitor-keys": "^1.0.0",
+        "resolve": "^1.12.0"
+      }
+    },
     "babel-jest": {
       "version": "24.9.0",
       "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-24.9.0.tgz",
@@ -911,6 +1010,12 @@
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
       "dev": true
     },
+    "builtin-modules": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-3.1.0.tgz",
+      "integrity": "sha512-k0KL0aWZuBt2lrxrcASWDfwOLMnodeQjodT/1SxEQAXsHANgo6ZC/VEaSEHCXt7aSTZ4/4H5LKa+tBXmW7Vtvw==",
+      "dev": true
+    },
     "cache-base": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
@@ -928,6 +1033,38 @@
         "unset-value": "^1.0.0"
       }
     },
+    "call-me-maybe": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/call-me-maybe/-/call-me-maybe-1.0.1.tgz",
+      "integrity": "sha1-JtII6onje1y95gJQoV8DHBak1ms=",
+      "dev": true
+    },
+    "caller-callsite": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/caller-callsite/-/caller-callsite-2.0.0.tgz",
+      "integrity": "sha1-hH4PzgoiN1CpoCfFSzNzGtMVQTQ=",
+      "dev": true,
+      "requires": {
+        "callsites": "^2.0.0"
+      },
+      "dependencies": {
+        "callsites": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/callsites/-/callsites-2.0.0.tgz",
+          "integrity": "sha1-BuuE8A7qQT2oav/vrL/7Ngk7PFA=",
+          "dev": true
+        }
+      }
+    },
+    "caller-path": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-2.0.0.tgz",
+      "integrity": "sha1-Ro+DBE42mrIBD6xfBs7uFbsssfQ=",
+      "dev": true,
+      "requires": {
+        "caller-callsite": "^2.0.0"
+      }
+    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -966,6 +1103,12 @@
         "supports-color": "^5.3.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -995,6 +1138,21 @@
         }
       }
     },
+    "cli-cursor": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
+      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^2.0.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "dev": true
+    },
     "cliui": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
@@ -1040,6 +1198,12 @@
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
+    "code-point-at": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
+      "dev": true
+    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -1114,6 +1278,36 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
+    "cosmiconfig": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.2.1.tgz",
+      "integrity": "sha512-H65gsXo1SKjf8zmrJ67eJk8aIRKV5ff2D4uKZIBZShbhGSpEmsQOPW/SKMKYhSTrqR7ufy6RP69rPogdaPh/kA==",
+      "dev": true,
+      "requires": {
+        "import-fresh": "^2.0.0",
+        "is-directory": "^0.3.1",
+        "js-yaml": "^3.13.1",
+        "parse-json": "^4.0.0"
+      },
+      "dependencies": {
+        "import-fresh": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/import-fresh/-/import-fresh-2.0.0.tgz",
+          "integrity": "sha1-2BNVwVYS04bGH53dOSLUMEgipUY=",
+          "dev": true,
+          "requires": {
+            "caller-path": "^2.0.0",
+            "resolve-from": "^3.0.0"
+          }
+        },
+        "resolve-from": {
+          "version": "3.0.0",
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+      "integrity": "sha512-wuYsAYYFdWTAnAaPoKGNhfpWwKZbJW+HgAJ+mImp+Epl7BG8oNWBCTyRM8gba9k4lk8BgWdoYm21Mo/RYhhbgA==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.9.0"
+      }
+    },
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
@@ -4355,6 +5550,12 @@
       "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=",
       "dev": true
     },
+    "shell-quote": {
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.7.2.tgz",
+      "integrity": "sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg==",
+      "dev": true
+    },
     "shellwords": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/shellwords/-/shellwords-0.1.1.tgz",
@@ -4379,6 +5580,17 @@
       "integrity": "sha512-ZYKh3Wh2z1PpEXWr0MpSBZ0V6mZHAQfYevttO11c51CaWjGTaadiKZ+wVt1PbMlDV5qhMFslpZCemhwOK7C89A==",
       "dev": true
     },
+    "slice-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-2.1.0.tgz",
+      "integrity": "sha512-Qu+VC3EwYLldKa1fCxuuvULvSJOKEgk9pi8dZeCVK7TqBfUNTH4sFkk4joj8afVSfAYgJoSOetjx9QWOJ5mYoQ==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^3.2.0",
+        "astral-regex": "^1.0.0",
+        "is-fullwidth-code-point": "^2.0.0"
+      }
+    },
     "snapdragon": {
       "version": "0.8.2",
       "resolved": "https://registry.npmjs.org/snapdragon/-/snapdragon-0.8.2.tgz",
@@ -4583,6 +5795,12 @@
         "extend-shallow": "^3.0.0"
       }
     },
+    "sprintf-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "dev": true
+    },
     "sshpk": {
       "version": "1.16.1",
       "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
@@ -4643,6 +5861,27 @@
         "strip-ansi": "^4.0.0"
       }
     },
+    "string-width": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+      "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "dev": true,
+      "requires": {
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^4.0.0"
+      }
+    },
+    "string.prototype.padend": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/string.prototype.padend/-/string.prototype.padend-3.0.0.tgz",
+      "integrity": "sha1-86rvfBcZ8XDF6rHDK/eA2W4h8vA=",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.4.3",
+        "function-bind": "^1.0.2"
+      }
+    },
     "string.prototype.trimleft": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.0.tgz",
@@ -4684,6 +5923,12 @@
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
+    "strip-json-comments": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.0.1.tgz",
+      "integrity": "sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==",
+      "dev": true
+    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -4699,6 +5944,46 @@
       "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
       "dev": true
     },
+    "table": {
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
+        "slice-ansi": "^2.1.0",
+        "string-width": "^3.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
     "test-exclude": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.3.tgz",
@@ -4711,12 +5996,33 @@
         "require-main-filename": "^2.0.0"
       }
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "throat": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/throat/-/throat-4.1.0.tgz",
       "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
+    },
+    "tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.2"
+      }
+    },
     "tmpl": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
@@ -4802,6 +6108,12 @@
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "tslib": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "dev": true
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -4926,6 +6238,12 @@
       "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
       "dev": true
     },
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -5063,6 +6381,15 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "write-file-atomic": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
diff --git a/package.json b/package.json
index ba9bdf1..6715978 100755
--- a/package.json
+++ b/package.json
@@ -24,7 +24,13 @@
   "scripts": {
     "test": "jest",
     "coverage": "jest --coverage",
-    "release": "np"
+    "release": "np",
+    "lint": "npm-run-all --parallel lint:*",
+    "lint:js": "eslint \"**/*.js\"",
+    "lint:format": "prettier \"**/*.{js,md}\" --check",
+    "fix": "npm-run-all --sequential fix:*",
+    "fix:js": "eslint \"**/*.js\" --fix",
+    "fix:format": "prettier \"**/*.{js,md}\" --write"
   },
   "author": "John Chipps-Harding (john@signal-noise.com)",
   "license": "MIT",
@@ -34,7 +40,16 @@
   "devDependencies": {
     "@testing-library/react-hooks": "^2.0.1",
     "axios-mock-adapter": "^1.17.0",
+    "babel-eslint": "^10.0.3",
+    "eslint": "^6.4.0",
+    "eslint-plugin-react": "^7.14.3",
+    "eslint-plugin-react-hooks": "^2.0.1",
+    "import-sort-cli": "^6.0.0",
+    "import-sort-parser-babylon": "^6.0.0",
+    "import-sort-style-module": "^6.0.0",
     "jest": "^24.8.0",
+    "npm-run-all": "^4.1.5",
+    "prettier": "^1.18.2",
     "react": "^16.9.0",
     "react-dom": "^16.9.0",
     "react-test-renderer": "^16.9.0"
diff --git a/test.js b/test.js
index c0f84de..fca11cc 100755
--- a/test.js
+++ b/test.js
@@ -154,7 +154,7 @@ describe("performs requests", () => {
   it("warns about bad finding a bad string in method type", async () => {
     mock.onGet(url).reply(200, "response");
 
-    const { result, waitForNextUpdate } = renderHook(() =>
+    const { result } = renderHook(() =>
       useApi(url, 0, { query: "hello" }, "POSTITNOIE")
     );
 
@@ -165,7 +165,7 @@ describe("performs requests", () => {
   it("warns about garbage in method type", async () => {
     mock.onGet(url).reply(200, "response");
 
-    const { result, waitForNextUpdate } = renderHook(() =>
+    const { result } = renderHook(() =>
       useApi(url, 0, { query: "hello" }, { something: "wrong" })
     );
 

From d3d19a0befaaac83380f0620b71542da7dc8196e Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Wed, 25 Sep 2019 11:56:36 +0100
Subject: [PATCH 03/14] Docs change

---
 .github/workflows/nodejs.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index f758f41..4e7646f 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Install latest npm
         run: npm install --global npm@latest
 
-      - name: npm install and test
+      - name: npm install, lint and test
         run: |
           npm install
           npm run lint

From f69ace469a4c3934b0327bd8cf544726a2073cfe Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Wed, 25 Sep 2019 12:58:19 +0100
Subject: [PATCH 04/14] Added test to replicate one of the issues

---
 test.js | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/test.js b/test.js
index fca11cc..43cd1dc 100755
--- a/test.js
+++ b/test.js
@@ -234,6 +234,29 @@ describe("performs requests", () => {
     expect(result.current.loading).toBeFalsy();
   });
 
+  it("refreshes when payload changes", async () => {
+    const postData = { query: "hello" };
+    const postData2 = { query: "hello2" };
+    mock.onPost(url, postData).reply(200, "response");
+    mock.onPost(url, postData2).reply(200, "response2");
+
+    const { result, waitForNextUpdate, rerender } = renderHook(() =>
+      useApi(url, 0, postData, "post")
+    );
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response");
+    expect(result.current.loading).toBeFalsy();
+
+    rerender(url, 0, postData2, "post");
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response2");
+    expect(result.current.loading).toBeFalsy();
+  });
+
   it("returns an error on request error", async () => {
     mock.onGet(url).reply(404, "response");
 

From d0430a2c566e0a6ef8746a9012b15dc52f88dcf2 Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Wed, 25 Sep 2019 15:10:13 +0100
Subject: [PATCH 05/14] Sorted failing tests

---
 index.js |  2 +-
 test.js  | 36 ++++++++++++++++++++++++++----------
 2 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/index.js b/index.js
index 952548a..45480e1 100755
--- a/index.js
+++ b/index.js
@@ -68,7 +68,7 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
       if (timeout) clearTimeout(timeout);
       source.cancel();
     };
-  }, [poll, apiEndpoint, pollInterval]);
+  }, [poll, apiEndpoint, pollInterval, payload, method]);
 
   return { data, loading, changed, error, refresh };
 };
diff --git a/test.js b/test.js
index 43cd1dc..31ff8a9 100755
--- a/test.js
+++ b/test.js
@@ -54,10 +54,11 @@ describe("performs requests", () => {
   });
 
   it("allows different formats of GET method param (GET)", async () => {
+    const params = { query: "hello" };
     mock.onGet(url).reply(200, "response");
 
     const { result, waitForNextUpdate } = renderHook(() =>
-      useApi(url, 0, { query: "hello" }, "GET")
+      useApi(url, 0, params, "GET")
     );
 
     await waitForNextUpdate();
@@ -67,10 +68,11 @@ describe("performs requests", () => {
   });
 
   it("allows different formats of GET method param (Get)", async () => {
+    const params = { query: "hello" };
     mock.onGet(url).reply(200, "response");
 
     const { result, waitForNextUpdate } = renderHook(() =>
-      useApi(url, 0, { query: "hello" }, "Get")
+      useApi(url, 0, params, "Get")
     );
 
     await waitForNextUpdate();
@@ -80,10 +82,11 @@ describe("performs requests", () => {
   });
 
   it("allows different formats of GET method param (gEt)", async () => {
+    const params = { query: "hello" };
     mock.onGet(url).reply(200, "response");
 
     const { result, waitForNextUpdate } = renderHook(() =>
-      useApi(url, 0, { query: "hello" }, "gEt")
+      useApi(url, 0, params, "gEt")
     );
 
     await waitForNextUpdate();
@@ -236,12 +239,20 @@ describe("performs requests", () => {
 
   it("refreshes when payload changes", async () => {
     const postData = { query: "hello" };
-    const postData2 = { query: "hello2" };
+    const postData2 = { query: "world" };
     mock.onPost(url, postData).reply(200, "response");
-    mock.onPost(url, postData2).reply(200, "response2");
 
-    const { result, waitForNextUpdate, rerender } = renderHook(() =>
-      useApi(url, 0, postData, "post")
+    const { result, waitForNextUpdate, rerender } = renderHook(
+      ({ apiEndpoint, pollInterval, payload, method }) =>
+        useApi(apiEndpoint, pollInterval, payload, method),
+      {
+        initialProps: {
+          apiEndpoint: url,
+          pollInterval: 0,
+          payload: postData,
+          method: "post"
+        }
+      }
     );
 
     await waitForNextUpdate();
@@ -249,7 +260,14 @@ describe("performs requests", () => {
     expect(result.current.data).toEqual("response");
     expect(result.current.loading).toBeFalsy();
 
-    rerender(url, 0, postData2, "post");
+    mock.onPost(url, postData2).reply(200, "response2");
+
+    rerender({
+      apiEndpoint: url,
+      pollInterval: 0,
+      payload: postData2,
+      method: "post"
+    });
 
     await waitForNextUpdate();
 
@@ -304,8 +322,6 @@ describe("performs requests", () => {
     expect(result.current.data).toEqual("response");
     expect(result.current.loading).toBeFalsy();
 
-    mock.onGet(url).reply(200, "response");
-
     act(() => {
       result.current.refresh();
     });

From b753890cf9dc74dce177eea77d7a5c379d27788d Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Wed, 25 Sep 2019 15:20:50 +0100
Subject: [PATCH 06/14] Sorted final warning

---
 index.js | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/index.js b/index.js
index 45480e1..d931a6d 100755
--- a/index.js
+++ b/index.js
@@ -1,4 +1,4 @@
-const { useEffect, useState } = require("react");
+const { useEffect, useState, useRef } = require("react");
 const axios = require("axios");
 const isEqual = require("lodash.isequal");
 
@@ -7,16 +7,13 @@ const { CancelToken } = axios;
 const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
   const [changed, setChanged] = useState(false);
   const [data, setData] = useState({});
-  const [lastData, setLastData] = useState({});
   const [error, setError] = useState(null);
   const [loading, setLoading] = useState(true);
   const [poll, setPoll] = useState(0);
+  const lastData = useRef(data);
 
   if (method.toLowerCase) method = method.toLowerCase();
 
-  // Function to force a refresh
-  const refresh = () => setPoll(poll + 1);
-
   useEffect(() => {
     let timeout;
 
@@ -45,9 +42,9 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
         // Make sure there are no errors reported
         setError(null);
         // Set the received data ONLY IF its changed, redraw performance gain!
-        if (!isEqual(response.data, lastData)) {
+        if (!isEqual(response.data, lastData.current)) {
           setChanged(true);
-          setLastData(response.data);
+          lastData.current = response.data;
           setData(response.data);
         }
       })
@@ -60,7 +57,8 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
         setLoading(false);
 
         // Poll if specified to do so
-        if (pollInterval) timeout = setTimeout(refresh, pollInterval);
+        if (pollInterval)
+          timeout = setTimeout(() => setPoll(poll + 1), pollInterval);
       });
 
     // Cleanup, clear a timeout and cancel the request.
@@ -68,9 +66,9 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
       if (timeout) clearTimeout(timeout);
       source.cancel();
     };
-  }, [poll, apiEndpoint, pollInterval, payload, method]);
+  }, [poll, setPoll, apiEndpoint, pollInterval, payload, method, lastData]);
 
-  return { data, loading, changed, error, refresh };
+  return { data, loading, changed, error, refresh: () => setPoll(poll + 1) };
 };
 
 module.exports = useApi;

From b6798bee15a11f4b511fb6b3bbbe1537cb69c93e Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Wed, 25 Sep 2019 15:38:15 +0100
Subject: [PATCH 07/14] Misc

---
 .eslintignore | 2 --
 1 file changed, 2 deletions(-)

diff --git a/.eslintignore b/.eslintignore
index 879f612..9c62828 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,5 +1,3 @@
 node_modules
 coverage
 dist
-public
-tmp

From 2f713b4613967020ab531945130646ca8b30e2bd Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Wed, 25 Sep 2019 15:48:24 +0100
Subject: [PATCH 08/14] 100% test code coverage

---
 test.js | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/test.js b/test.js
index 31ff8a9..2e5b1e8 100755
--- a/test.js
+++ b/test.js
@@ -332,4 +332,29 @@ describe("performs requests", () => {
     expect(result.current.changed).toBeFalsy();
     expect(result.current.loading).toBeFalsy();
   });
+
+  it("request can be aborted mid-request", async () => {
+    mock.onGet(url).reply(() => new Promise(() => {}));
+    mock.onGet(url + "2").reply(200, "response2");
+
+    const { result, waitForNextUpdate, rerender } = renderHook(
+      ({ apiEndpoint, pollInterval }) => useApi(apiEndpoint, pollInterval),
+      {
+        initialProps: {
+          apiEndpoint: url,
+          pollInterval: 0
+        }
+      }
+    );
+
+    rerender({
+      apiEndpoint: url + "2",
+      pollInterval: 0
+    });
+
+    await waitForNextUpdate();
+
+    expect(result.current.data).toEqual("response2");
+    expect(result.current.loading).toBeFalsy();
+  });
 });

From 640d64d8f833f36d6afd8b78901966a8b517660a Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Thu, 26 Sep 2019 01:29:35 +0100
Subject: [PATCH 09/14] Changed to callback

---
 README.md |  3 ++-
 index.js  | 24 ++++++++++++++++++------
 test.js   | 14 ++++++++++----
 3 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/README.md b/README.md
index 755575a..7334b50 100755
--- a/README.md
+++ b/README.md
@@ -83,12 +83,13 @@ const PeopleSearch = () = {
 - `pollInterval` - How often to re-request updated data. Pass 0 to disable polling (the default behaviour).
 - `payload` - A data object to send in the request. If we are performing a GET request, it is appended into the querystring (e.g. `?keywords=hello`). If it is a POST request it is sent in the request body as JSON.
 - `method` - Set the request type, either `get` or `post`. (defaults to `get`)
+- `changed`: A function to call if the data actually changed during the request.
 
 ### Output
 
 - `data`: The data returned from the API.
 - `loading`: A boolean signifying if the data is currently being loaded.
-- `changed`: A boolean signifying if the data changed during the last load.
+
 - `error`: A string representation of an error if it occurred during loading.
 - `refresh`: A function to call to re-request the data.
 
diff --git a/index.js b/index.js
index d931a6d..695e702 100755
--- a/index.js
+++ b/index.js
@@ -4,8 +4,13 @@ const isEqual = require("lodash.isequal");
 
 const { CancelToken } = axios;
 
-const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
-  const [changed, setChanged] = useState(false);
+const useApi = (
+  apiEndpoint,
+  pollInterval,
+  payload,
+  method = "get",
+  changed
+) => {
   const [data, setData] = useState({});
   const [error, setError] = useState(null);
   const [loading, setLoading] = useState(true);
@@ -29,8 +34,6 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
     // Set loading to be true
     setLoading(true);
 
-    setChanged(false);
-
     // Make call to the API
     axios(apiEndpoint, {
       method,
@@ -43,9 +46,9 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
         setError(null);
         // Set the received data ONLY IF its changed, redraw performance gain!
         if (!isEqual(response.data, lastData.current)) {
-          setChanged(true);
           lastData.current = response.data;
           setData(response.data);
+          if (changed) changed(response.data);
         }
       })
       .catch(thrown => {
@@ -66,7 +69,16 @@ const useApi = (apiEndpoint, pollInterval, payload, method = "get") => {
       if (timeout) clearTimeout(timeout);
       source.cancel();
     };
-  }, [poll, setPoll, apiEndpoint, pollInterval, payload, method, lastData]);
+  }, [
+    poll,
+    setPoll,
+    apiEndpoint,
+    pollInterval,
+    payload,
+    method,
+    lastData,
+    changed
+  ]);
 
   return { data, loading, changed, error, refresh: () => setPoll(poll + 1) };
 };
diff --git a/test.js b/test.js
index 2e5b1e8..a8d8e9f 100755
--- a/test.js
+++ b/test.js
@@ -291,8 +291,11 @@ describe("performs requests", () => {
 
   it("notified when data has changed", async () => {
     mock.onGet(url).reply(200, "response");
+    const mockChanged = jest.fn();
 
-    const { result, waitForNextUpdate } = renderHook(() => useApi(url, 0));
+    const { result, waitForNextUpdate } = renderHook(() =>
+      useApi(url, 0, null, "get", mockChanged)
+    );
 
     await waitForNextUpdate();
 
@@ -308,14 +311,17 @@ describe("performs requests", () => {
     await waitForNextUpdate();
 
     expect(result.current.data).toEqual("response2");
-    expect(result.current.changed).toBeTruthy();
     expect(result.current.loading).toBeFalsy();
+    expect(mockChanged.mock.calls.length).toBe(2);
   });
 
   it("does not notify when data has not changed", async () => {
     mock.onGet(url).reply(200, "response");
+    const mockChanged = jest.fn();
 
-    const { result, waitForNextUpdate } = renderHook(() => useApi(url, 0));
+    const { result, waitForNextUpdate } = renderHook(() =>
+      useApi(url, 0, null, "get", mockChanged)
+    );
 
     await waitForNextUpdate();
 
@@ -329,8 +335,8 @@ describe("performs requests", () => {
     await waitForNextUpdate();
 
     expect(result.current.data).toEqual("response");
-    expect(result.current.changed).toBeFalsy();
     expect(result.current.loading).toBeFalsy();
+    expect(mockChanged.mock.calls.length).toBe(1);
   });
 
   it("request can be aborted mid-request", async () => {

From 70c565ba8b96ad257bb14da9b609201b1806792b Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Thu, 26 Sep 2019 01:31:26 +0100
Subject: [PATCH 10/14] CHANGELOG

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95d92a9..6cb9c68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to this project are documented in this file.
 
 ## Unreleased
 
-- Added: `changed` property.
+- Added: `changed` callback argument.
 
 ## 0.1.3
 

From 8e61d6c961a094dd000eed664fc054634e0dd733 Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Thu, 26 Sep 2019 12:22:40 +0100
Subject: [PATCH 11/14] Make change optional.

---
 README.md |  2 +-
 index.js  | 14 ++++++++++----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 7334b50..333a555 100755
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ const PeopleSearch = () = {
 - `pollInterval` - How often to re-request updated data. Pass 0 to disable polling (the default behaviour).
 - `payload` - A data object to send in the request. If we are performing a GET request, it is appended into the querystring (e.g. `?keywords=hello`). If it is a POST request it is sent in the request body as JSON.
 - `method` - Set the request type, either `get` or `post`. (defaults to `get`)
-- `changed`: A function to call if the data actually changed during the request.
+- `changed`: A function to call if the data actually changed during the request. If this is specified, use-api does extra checking and compares old and new data. If data does not change, data will remain the same, avoiding a redraw.
 
 ### Output
 
diff --git a/index.js b/index.js
index 695e702..2d250ba 100755
--- a/index.js
+++ b/index.js
@@ -44,11 +44,17 @@ const useApi = (
       .then(response => {
         // Make sure there are no errors reported
         setError(null);
-        // Set the received data ONLY IF its changed, redraw performance gain!
-        if (!isEqual(response.data, lastData.current)) {
-          lastData.current = response.data;
+
+        // Only do change detection if change is defined.
+        if (changed) {
+          if (!isEqual(response.data, lastData.current)) {
+            // Set the received data ONLY IF its changed, redraw performance gain!
+            lastData.current = response.data;
+            setData(response.data);
+            changed(response.data);
+          }
+        } else {
           setData(response.data);
-          if (changed) changed(response.data);
         }
       })
       .catch(thrown => {

From 3974bc187b8bf03912add9c16e539a3725313c8e Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Thu, 26 Sep 2019 14:24:06 +0100
Subject: [PATCH 12/14] Added further documentation on the risks involved with
 using change.

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 333a555..f7f3e21 100755
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ const PeopleSearch = () = {
 - `pollInterval` - How often to re-request updated data. Pass 0 to disable polling (the default behaviour).
 - `payload` - A data object to send in the request. If we are performing a GET request, it is appended into the querystring (e.g. `?keywords=hello`). If it is a POST request it is sent in the request body as JSON.
 - `method` - Set the request type, either `get` or `post`. (defaults to `get`)
-- `changed`: A function to call if the data actually changed during the request. If this is specified, use-api does extra checking and compares old and new data. If data does not change, data will remain the same, avoiding a redraw.
+- `changed`: A function to call if the data actually changed during the request. If this is specified, use-api does extra checking and compares old and new data. If data does not change, data will remain the same, avoiding a redraw. Please note, this may have performance repercussions if the data is large as it performs a deep comparison between new and old data to determine if they are equivalent.
 
 ### Output
 

From 05dff2fad8d5d244a1cfcd540b6c636a823f06e5 Mon Sep 17 00:00:00 2001
From: John Chipps-Harding <john@signal-noise.co.uk>
Date: Thu, 26 Sep 2019 20:41:04 +0100
Subject: [PATCH 13/14] Misc

---
 README.md | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/README.md b/README.md
index f7f3e21..b6b31ee 100755
--- a/README.md
+++ b/README.md
@@ -83,13 +83,12 @@ const PeopleSearch = () = {
 - `pollInterval` - How often to re-request updated data. Pass 0 to disable polling (the default behaviour).
 - `payload` - A data object to send in the request. If we are performing a GET request, it is appended into the querystring (e.g. `?keywords=hello`). If it is a POST request it is sent in the request body as JSON.
 - `method` - Set the request type, either `get` or `post`. (defaults to `get`)
-- `changed`: A function to call if the data actually changed during the request. If this is specified, use-api does extra checking and compares old and new data. If data does not change, data will remain the same, avoiding a redraw. Please note, this may have performance repercussions if the data is large as it performs a deep comparison between new and old data to determine if they are equivalent.
+- `changed`: A function that is called if the data actually changed during the request. If this is specified, use-api does extra checking and compares old and new data. If data does not change, data remains unchanged. Please note, this may have performance repercussions if the data is large as it performs a deep comparison between new and old data to determine if they are equivalent.
 
 ### Output
 
 - `data`: The data returned from the API.
 - `loading`: A boolean signifying if the data is currently being loaded.
-
 - `error`: A string representation of an error if it occurred during loading.
 - `refresh`: A function to call to re-request the data.
 

From e9b5c9738f6699162dc6ba6af6044262a7816b8b Mon Sep 17 00:00:00 2001
From: John Richard Chipps-Harding <john@signal-noise.co.uk>
Date: Thu, 26 Sep 2019 20:48:24 +0100
Subject: [PATCH 14/14] Update README.md

Co-Authored-By: Marcel Kornblum <marcelkornblum@users.noreply.github.com>
---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index b6b31ee..d276015 100755
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ const PeopleSearch = () = {
 - `pollInterval` - How often to re-request updated data. Pass 0 to disable polling (the default behaviour).
 - `payload` - A data object to send in the request. If we are performing a GET request, it is appended into the querystring (e.g. `?keywords=hello`). If it is a POST request it is sent in the request body as JSON.
 - `method` - Set the request type, either `get` or `post`. (defaults to `get`)
-- `changed`: A function that is called if the data actually changed during the request. If this is specified, use-api does extra checking and compares old and new data. If data does not change, data remains unchanged. Please note, this may have performance repercussions if the data is large as it performs a deep comparison between new and old data to determine if they are equivalent.
+- `changed`: A function that is called if the data actually changed during the request. If this is specified, use-api does extra checking and compares old and new data. If data does not change, new data is not propagated and a redraw is saved. Please note, this may have performance repercussions if the data is large as it performs a deep comparison between new and old data to determine if they are equivalent.
 
 ### Output