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[JavaScript, Angular, ReactJS] Only 39% of the functions in node_modules are unique in the default Angular project (перевод)

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30-Апр-2021 13:34
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Only 39% of the functions in node_modules are unique in the default Angular project created by ng new my-app.
I think the developers of open source solve problems in the same ways, because they study the same algorithms. Well, why be honest, they copy the popular solutions from StackOverflow also.

How to compare functions in Javascript?
If you want to compare functions in Javascript, then just convert them to string form:
const a = () => 'hi';
a.toString(); // "() => 'hi'"

If variable names are different
It is necessary to bring them to the same form using the UglifyJs library. UglifyJs will minimizes functions, remove unnecessary strings, and make simple calculations.
How do you extract functions from a Javascript file?
For this I used the Esprima library. We parse the file and walk an AST tree. I think that it would be possible only with Uglifyjs, but something was wrong and I was too lazy to figure it out.
Action plan
  • Iterate through all the * .js files in the directory
  • Parse each file and extract functions of types ArrowFunctionExpression,FunctionExpression and FunctionDeclaration
  • Compress each of the functions using UglifyJs and write it to a file whose name is the hash of the function
  • Put the id, path and hash to the separate file info.csv
  • Load the file info.csv intoSQLite and make all kinds of queries, because this database is not a toy!

Implementation details
  • I named all arrow functions and functional expressions z;
  • I renamed the usual functions to MORK, but kept the original names separately, because the function may be the same, but have a different name;
  • Perhaps with these renames I lost some of the statistics related to recursive functions, well, okay!

Extracting functions from a file
Listing of the file from which we will extract functions:
(function () {
    const arbuz = (test) => {
        function apple(t) {
            function test () {
                return 'ttt';
            }
            return t + 3;
        }
        const aa = 1;
        const b1 = () => 2;
        // comment
        return aa + b1() + apple(test);
    }
    return arbuz;
})();

Note that some of the expressions are calculated, that's comfortable for function comparing. The list of the extracted functions:
"const z=function(){return n=>{return 3+(n+3)}};";
"const z=n=>{return 3+(n+3)};";
"function MORK(n){return n+3}";
"function MORK(){return"ttt"}";
"const z=()=>2;";

Full script can be found here
First research object: node_modules of the default Angular 11 project
So, we have to create a project using @angular/cli: ng new my-app and run our script to parse node_modules. It can take a lot of time.

View package.json

SPL
{
  "name": "my-app",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --prod",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~11.2.10",
    "@angular/common": "~11.2.10",
    "@angular/compiler": "~11.2.10",
    "@angular/core": "~11.2.10",
    "@angular/forms": "~11.2.10",
    "@angular/platform-browser": "~11.2.10",
    "@angular/platform-browser-dynamic": "~11.2.10",
    "@angular/router": "~11.2.10",
    "rxjs": "~6.6.0",
    "tslib": "^2.0.0",
    "zone.js": "~0.11.3"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.1102.9",
    "@angular/cli": "~11.2.9",
    "@angular/compiler-cli": "~11.2.10",
    "@types/jasmine": "~3.6.0",
    "@types/node": "^12.11.1",
    "codelyzer": "^6.0.0",
    "jasmine-core": "~3.6.0",
    "jasmine-spec-reporter": "~5.0.0",
    "karma": "~6.1.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage": "~2.0.3",
    "karma-jasmine": "~4.0.0",
    "karma-jasmine-html-reporter": "^1.5.0",
    "protractor": "~7.0.0",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~4.1.5"
  }
}

The package-lock.json here

Results
The node_modules folder contains 26982 * .js files:
$ find . -name '*.js' | wc -l
26982

Number of functions found: 338230
sqlite> select count(*) from info;
338230

Including unique: 130886
sqlite> Select count(*) from (SELECT hash, count(id) as c FROM info group By hash);
130886

Whence it follows that 130886/338230 * 100% = 39% of the functions are really unique, and the rest are duplicates of existing ones.
You can download the csv file for self-checking here.
Top 20 most popular functions in node_modules for an Angular project
Function with the largest number of duplicates.
SELECT hash, count(id) as c FROM info group By hash order by c desc LIMIT 20;

#
id
number of duplicates
1
285d00ca29fcc46aa113c7aefc63827d
2730
2
cf6a0564f1128496d1e4706f302787d6
1871
3
12f746f2689073d5c949998e0216f68a
1174
4
7d1e7aad635be0f7382696c4f846beae
772
5
c2da306af9b041ba213e3b189699d45c
699
6
c41eb44114860f3aa1e9fa79c779e02f
697
7
5911b29c89fa44f28ce030aa5e433327
691
8
05c2b9b254be7e4b8460274c1353b5ad
653
9
fcaede1b9e574664c893e75ee7dc1d8b
652
10
e743dd760a03449be792c00e65154a48
635
11
777c390d3cc4663f8ebe4933e5c33e9d
441
12
27628ad740cff22386b0ff029e844e85
385
13
f6822db5c8812f4b09ab142afe908cda
375
14
d98a03a472615305b012eceb3e9947d5
330
15
4728096fca2b3575800dafbdebf4276a
324
16
7b769d3e4ba438fc53b42ad8bece86ba
289
17
7d6f69751712ef9fa94238b38120adc6
282
18
b7081aad7510b0993fcb57bfb95c5c2c
255
19
d665499155e104f749bf3a67caed576a
250
20
99fa7dfce87269a564fc848a7f7515b9
250
  • 285d00ca29fcc46aa113c7aefc63827d, 2730 identical
    const z=function(){};

  • cf6a0564f1128496d1e4706f302787d6, 1871 identical, function names usually: __export
    function MORK(r){for(var o in r)exports.hasOwnProperty(o)||(exports[o]=r[o])}

  • 12f746f2689073d5c949998e0216f68a, 1174 identical, function names_interopRequireDefault и __importDefault
    function MORK(e){return e&&e.__esModule?e:{default:e}}

  • 7d1e7aad635be0f7382696c4f846beae, 772 identical
    function MORK(){}

  • c2da306af9b041ba213e3b189699d45c, 699 identical
    const z=function(o,_){o.__proto__=_};

  • c41eb44114860f3aa1e9fa79c779e02f, 697 identical, functions name: __
    function MORK(){this.constructor=d}

  • 5911b29c89fa44f28ce030aa5e433327, 691 identical
    const z=function(n,o){for(var r in o)o.hasOwnProperty(r)&&(n[r]=o[r])};

  • 05c2b9b254be7e4b8460274c1353b5ad, 653 identical
    const z=function(t,n){return extendStatics=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,n){t.__proto__=n}||function(t,n){for(var o in n)n.hasOwnProperty(o)&&(t[o]=n[o])},extendStatics(t,n)};

  • fcaede1b9e574664c893e75ee7dc1d8b, 652 identical
    const z=function(t,o){function e(){this.constructor=t}extendStatics(t,o),t.prototype=null===o?Object.create(o):(e.prototype=o.prototype,new e)};

  • e743dd760a03449be792c00e65154a48, 635 identical
    function(){var r=function(t,o){return(r=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,o){t.__proto__=o}||function(t,o){for(var n in o)o.hasOwnProperty(n)&&(t[n]=o[n])})(t,o)};return function(t,o){function n(){this.constructor=t}r(t,o),t.prototype=null===o?Object.create(o):(n.prototype=o.prototype,new n)}};

  • 777c390d3cc4663f8ebe4933e5c33e9d, 441 identical, function names usually: Rule, AsapScheduler, ComplexOuterSubscriber и другие
    function MORK(){return null!==_super&&_super.apply(this,arguments)||this}

  • 27628ad740cff22386b0ff029e844e85, 385 identical, function names usually: identity, forwardResolution и тд
    function MORK(n){return n}

  • f6822db5c8812f4b09ab142afe908cda, 375 identical
    const z=function(n){};

  • d98a03a472615305b012eceb3e9947d5, 330 identical
    const z=function(n,c){};

  • 4728096fca2b3575800dafbdebf4276a, 324 identical
    const z=function(n){return n};

  • 7b769d3e4ba438fc53b42ad8bece86ba, 289 identical, function names:plural
    function MORK(t){var r=Math.floor(Math.abs(t)),t=t.toString().replace(/^[^.]*\.?/,"").length;return 1===r&&0===t?1:5}

  • 7d6f69751712ef9fa94238b38120adc6, 255 identical
    const z=function(){return this};

  • b7081aad7510b0993fcb57bfb95c5c2c, 250 identical
    const z=function(){return!1};

  • d665499155e104f749bf3a67caed576a, 250 identical
    const z=function(n){return null==n};

  • 99fa7dfce87269a564fc848a7f7515b9, 255 identical
    const z=function(a,c){this._array.forEach(a,c)};


Files with the largest number of functions
SELECT count(id) as c, path FROM info group By path order by c desc LIMIT 20;

quantity
file
13638
typescript/lib/tsserver.js
13617
typescript/lib/tsserverlibrary.js
12411
typescript/lib/typescriptServices.js
12411
typescript/lib/typescript.js
12411
@schematics/angular/third_party/github.com/Microsoft/TypeScript/lib/typescript.js
10346
sass/sass.dart.js
8703
typescript/lib/typingsInstaller.js
8528
typescript/lib/tsc.js
3933
@angular/compiler/bundles/compiler.umd.js
3803
@angular/compiler/bundles/compiler.umd.min.js
2602
selenium-webdriver/lib/test/data/js/tinymce.min.js
2264
@angular/core/bundles/core.umd.js
2028
@angular/core/bundles/core.umd.min.js
1457
terser/dist/bundle.min.js
1416
rxjs/bundles/rxjs.umd.js
1416
@angular-devkit/schematics/node_modules/rxjs/bundles/rxjs.umd.js
1416
@angular-devkit/core/node_modules/rxjs/bundles/rxjs.umd.js
1416
@angular-devkit/build-webpack/node_modules/rxjs/bundles/rxjs.umd.js
1416
@angular-devkit/build-angular/node_modules/rxjs/bundles/rxjs.umd.js
1416
@angular-devkit/architect/node_modules/rxjs/bundles/rxjs.umd.js
What about the production js bundle?
Nothing really interesting. The Webpack works efficiently. 95% functions are unique of the 1282 used. Here are top five functions that have duplicates:
quantity
function
11
const z=function(){};
10
const z=()=>R;
8
const z=function(n){return new(n||t)};
6
const z=function(n){};
5
const z=()=>{};
What about React?
I also checked React. I put the comparison in the table below:
In the node_modules
Angular
React
total * .js files
26982
23942
total functions
338230
163385
unique functions
130886
92766
% of unique functions
39%
57%
You can download the csv file for self-checking here.
Top 20 most popular functions in node_modules for the React project
The react project was generated by create-react-app my-app. The files package.json and yarn.lock are here.
#
id
number of duplicates
1
12f746f2689073d5c949998e0216f68a
1377
2
285d00ca29fcc46aa113c7aefc63827d
1243
3
3f993321f73e83f277c20c178e5587b9
989
4
54782ec6cef850906484808b86946b33
299
5
7d1e7aad635be0f7382696c4f846beae
278
6
d11004e998280b565ad084b0ad5ca214
239
7
a02c66d8928b3353552e4804c6714326
237
8
79e9bd3cdf15cf0af97f73ccaed50fa0
231
9
7d6f69751712ef9fa94238b38120adc6
189
10
b8dd34af96b042c23a4be7f82c881fe4
176
11
863a48e36413feba8bb299623dbc9b20
174
12
2482d2afd404031c67adb9cbc012768b
174
13
4728096fca2b3575800dafbdebf4276a
170
14
bf8b05684375b26205e50fa27317057e
157
15
fd114ee6b71ee06738b5b547b00e8102
156
16
df1c43e5a72e92d11bdefcead13a5e14
156
17
094afc30995ff28993ec5326e8b3c4d4
156
18
042490db7093660e74a762447f64f950
156
19
5c5979ec3533f13b22153de05ffc64d5
154
20
50645492c50621c0847c4ebd1fdd65cd
154
  • 12f746f2689073d5c949998e0216f68a, 1377 identical, function names usually: _interopRequireDefault
    function MORK(e){return e&&e.__esModule?e:{default:e}}

  • 285d00ca29fcc46aa113c7aefc63827d, 1243 identical
    const z=function(){};

  • 3f993321f73e83f277c20c178e5587b9, 989 identical
    const z=function(){return data};

  • 54782ec6cef850906484808b86946b33, 299 identical
    const z=()=>{};

  • 7d1e7aad635be0f7382696c4f846beae, 278 identical, function names: emptyFunction, Generator
    function MORK(){}

  • d11004e998280b565ad084b0ad5ca214, 239 identical
    const z=function(){return cache};

  • a02c66d8928b3353552e4804c6714326, 237 identical, function names: _getRequireWildcardCache
    function MORK(){if("function"!=typeof WeakMap)return null;var e=new WeakMap;return _getRequireWildcardCache=function(){return e},e}

  • 79e9bd3cdf15cf0af97f73ccaed50fa0, 231 identical, function names _interopRequireWildcard
    function MORK(e){if(e&&e.__esModule)return e;if(null===e||"object"!=typeof e&&"function"!=typeof e)return{default:e};var t=_getRequireWildcardCache();if(t&&t.has(e))return t.get(e);var r,n,o={},c=Object.defineProperty&&Object.getOwnPropertyDescriptor;for(r in e)Object.prototype.hasOwnProperty.call(e,r)&&((n=c?Object.getOwnPropertyDescriptor(e,r):null)&&(n.get||n.set)?Object.defineProperty(o,r,n):o[r]=e[r]);return o.default=e,t&&t.set(e,o),o}

  • 7d6f69751712ef9fa94238b38120adc6, 189 identical
    const z=function(){return this};

  • b8dd34af96b042c23a4be7f82c881fe4, 176 identical
    const z=function(n,o,c,i){n[i=void 0===i?c:i]=o[c]};

  • 863a48e36413feba8bb299623dbc9b20, 174 identical
    const z=function(e,n,t,o){void 0===o&&(o=t),Object.defineProperty(e,o,{enumerable:!0,get:function(){return n[t]}})};

  • 2482d2afd404031c67adb9cbc012768b, 174 identical
    const z=function(){return m[k]};

  • 4728096fca2b3575800dafbdebf4276a, 170 identical
    const z=function(n){return n};

  • bf8b05684375b26205e50fa27317057e, 157 identical
    const z=s=>exposed.has(s);

  • fd114ee6b71ee06738b5b547b00e8102, 156 identical
    const z=(r,e,p)=>{var t=makeWrapper(r);return exports.setup(t,r,e,p)};

  • df1c43e5a72e92d11bdefcead13a5e14, 156 identical
    const z=t=>utils.isObject(t)&&t instanceof Impl.implementation;

  • 094afc30995ff28993ec5326e8b3c4d4, 156 identical
    const z=i=>utils.isObject(i)&&utils.hasOwn(i,implSymbol)&&i[implSymbol]instanceof Impl.implementation;

  • 042490db7093660e74a762447f64f950, 156 identical
    const z=(r,e,t)=>{t=exports.create(r,e,t);return utils.implForWrapper(t)};

  • 5c5979ec3533f13b22153de05ffc64d5, 154 identical
    const z=function(e){if(e&&e.__esModule)return e;var t={};if(null!=e)for(var r in e)"default"!==r&&Object.prototype.hasOwnProperty.call(e,r)&&__createBinding(t,e,r);return __setModuleDefault(t,e),t};

  • 50645492c50621c0847c4ebd1fdd65cd, 154 identical
    const z=function(e,n){Object.defineProperty(e,"default",{enumerable:!0,value:n})};


Which files use function 8 (79e9bd3cdf15cf0af97f73ccaed50fa0)

View file list

SPL
The list is long
/jest-worker/build/base/BaseWorkerPool.js
/@svgr/hast-util-to-babel-ast/lib/index.js
/@svgr/hast-util-to-babel-ast/lib/handlers.js
/@svgr/hast-util-to-babel-ast/lib/stringToObjectStyle.js
/@svgr/hast-util-to-babel-ast/lib/getAttributes.js
/babel-jest/node_modules/@babel/core/lib/transform-file.js
/babel-jest/node_modules/@babel/core/lib/config/files/configuration.js
/babel-jest/node_modules/@babel/core/lib/config/files/utils.js
/babel-jest/node_modules/@babel/core/lib/config/full.js
/babel-jest/node_modules/@babel/core/lib/transformation/normalize-file.js
/babel-jest/node_modules/@babel/core/lib/transformation/file/file.js
/babel-jest/node_modules/@babel/core/lib/tools/build-external-helpers.js
/babel-jest/node_modules/@babel/core/lib/index.js
/jest-pnp-resolver/node_modules/jest-resolve/build/defaultResolver.js
/jest-pnp-resolver/node_modules/jest-resolve/build/ModuleNotFoundError.js
/jest-circus/build/utils.js
/jest-haste-map/build/ModuleMap.js
/jest-haste-map/build/lib/normalizePathSep.js
/jest-haste-map/build/lib/fast_path.js
/jest-haste-map/build/lib/WatchmanWatcher.js
/jest-haste-map/build/worker.js
/jest-haste-map/build/getMockName.js
/jest-haste-map/build/HasteFS.js
/jest-haste-map/build/crawlers/watchman.js
/jest-jasmine2/build/index.js
/eslint/node_modules/@babel/code-frame/lib/index.js
/mini-css-extract-plugin/dist/index.js
/react-scripts/node_modules/@babel/core/lib/transform-file.js
/react-scripts/node_modules/@babel/core/lib/config/files/configuration.js
/react-scripts/node_modules/@babel/core/lib/config/files/utils.js
/react-scripts/node_modules/@babel/core/lib/config/full.js
/react-scripts/node_modules/@babel/core/lib/transformation/normalize-file.js
/react-scripts/node_modules/@babel/core/lib/transformation/file/file.js
/react-scripts/node_modules/@babel/core/lib/tools/build-external-helpers.js
/react-scripts/node_modules/@babel/core/lib/index.js
/react-scripts/node_modules/jest-resolve/build/defaultResolver.js
/react-scripts/node_modules/jest-resolve/build/ModuleNotFoundError.js
/eslint-plugin-flowtype/dist/utilities/index.js
/jest-util/build/index.js
/jest-util/build/createDirectory.js
/jest-util/build/installCommonGlobals.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx-development/node_modules/@babel/core/lib/transform-file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx-development/node_modules/@babel/core/lib/config/files/configuration.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx-development/node_modules/@babel/core/lib/config/files/utils.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx-development/node_modules/@babel/core/lib/config/full.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx-development/node_modules/@babel/core/lib/transformation/normalize-file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx-development/node_modules/@babel/core/lib/transformation/file/file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx-development/node_modules/@babel/core/lib/tools/build-external-helpers.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx-development/node_modules/@babel/core/lib/index.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-pure-annotations/node_modules/@babel/core/lib/transform-file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-pure-annotations/node_modules/@babel/core/lib/config/files/configuration.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-pure-annotations/node_modules/@babel/core/lib/config/files/utils.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-pure-annotations/node_modules/@babel/core/lib/config/full.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-pure-annotations/node_modules/@babel/core/lib/transformation/normalize-file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-pure-annotations/node_modules/@babel/core/lib/transformation/file/file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-pure-annotations/node_modules/@babel/core/lib/tools/build-external-helpers.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-pure-annotations/node_modules/@babel/core/lib/index.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx/node_modules/@babel/core/lib/transform-file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx/node_modules/@babel/core/lib/config/files/configuration.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx/node_modules/@babel/core/lib/config/files/utils.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx/node_modules/@babel/core/lib/config/full.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx/node_modules/@babel/core/lib/transformation/normalize-file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx/node_modules/@babel/core/lib/transformation/file/file.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx/node_modules/@babel/core/lib/tools/build-external-helpers.js
/babel-preset-react-app/node_modules/@babel/plugin-transform-react-jsx/node_modules/@babel/core/lib/index.js
/babel-preset-react-app/node_modules/@babel/preset-env/node_modules/@babel/plugin-proposal-class-properties/node_modules/@babel/core/lib/transform-file.js
/babel-preset-react-app/node_modules/@babel/preset-env/node_modules/@babel/plugin-proposal-class-properties/node_modules/@babel/core/lib/config/files/configuration.js
/babel-preset-react-app/node_modules/@babel/preset-env/node_modules/@babel/plugin-proposal-class-properties/node_modules/@babel/core/lib/config/files/utils.js
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Сonclusions?
Perhaps this little research will give someone thoughts about refactoring. Or changing the programming approach.
It is good that people use some common approaches and patterns for programming.
It's bad that there is a lot of copy-paste.
P.S.
Used scripts can be found on GitHub
 ===========
 Источник:
habr.com
===========
 ===========
 Автор оригинала: Pavel Gurov
===========Похожие новости: Теги для поиска: #_javascript, #_angular, #_reactjs, #_javascript, #_angular, #_react, #_node_modules, #_statistics, #_javascript, #_angular, #_reactjs
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