Quoi / Pourquoi

Pour le meilleur ou pour le pire, le contenu de package.json est devenu de plus en plus complexe. Dans les premiers jours de npm, le fichier n'était que quelques métadonnées sur les dépendances dont dépendait un projet/package. Les projets sont devenus de plus en plus complexes et maintenant les tests, les frameworks et les autres bibliothèques sont tous des dépendances qui semblent s'assembler. Il y avait une certaine séparation avec dependencies et devDependencies , mais c'est une catégorisation approximative. Nous avons maintenant des outils qui contribuent et s'installent dans le package.json avec une plus grande complexité... configurations monorepo, configurations lint, configurations commit, git hooks, nodemon, jest, la liste est longue...

Les commentaires offrent un moyen d'expliquer toute la complexité.

Je pense toujours que les responsables de la bibliothèque devraient toujours utiliser du JSON pur pour la compatibilité descendante, mais au moins offrir cela permettra aux créateurs de projets (la grande majorité des utilisateurs) de documenter leur package.json. Certes, json permet aux clés en double de servir de commentaires, mais cela ressemble trop à un hack.

Comment

Comportement actuel

Un exemple rédigé et inventé :

{
  "name": "my-project",
  "version": "0.0.1",
  "license": "MIT",
  "scripts": {
    "build": "a bunch of scripts",
    "ci": "a bunch of scripts",
    "ci:local": "a bunch of scripts",
    "docsite": "a bunch of scripts",
    "docsite:combiner": "a bunch of scripts",
    "docsite:sassdoc": "a bunch of scripts",
    "docsite:tsdoc": "a bunch of scripts",
    "e2e": "a bunch of scripts",
    "html-sketchapp-install": "a bunch of scripts",
    "html-sketchapp": "a bunch of scripts",
    "lint": "a bunch of scripts",
    "sassdoc": "a bunch of scripts",
    "sassdoc:comp": "a bunch of scripts",
    "sassdoc:core": "a bunch of scripts",
    "start": "a bunch of scripts",
    "start:hmr": "a bunch of scripts",
    "start:qa": "a bunch of scripts",
    "start:dev": "a bunch of scripts",
    "generate-examples": "a bunch of scripts",
    "rebuild-markdown": "a bunch of scripts",
    "watch-examples": "a bunch of scripts",
    "test:cov": "a bunch of scripts",

    "test": "jest",
    "test:watch": "jest --watch",
    "test:cc": "jest --coverage"
  },
  "config": {
    "commitizen": {
      "path": "./node_modules/cz-conventional-changelog"
    }
  },
  "dependencies": {
    "@angular-devkit/build-angular": "~0.900.1",
    "@angular-devkit/build-ng-packagr": "~0.900.1",
    "@angular-devkit/core": "~9.0.0",
    "@angular-devkit/schematics": "~9.0.0",
    "@angular/animations": "~9.0.0",
    "@angular/cdk": "~9.0.0",
    "@angular/cli": "~9.0.1",
    "@angular/common": "~9.0.0",
    "@angular/compiler": "~9.0.0",
    "@angular/compiler-cli": "~9.0.0",
    "@angular/core": "~9.0.0",
    "@angular/forms": "~9.0.0",
    "@angular/language-service": "~9.0.0",
    "@angular/platform-browser": "~9.0.0",
    "@angular/platform-browser-dynamic": "~9.0.0",
    "@angular/router": "~9.0.0",
    "@angular/service-worker": "~9.0.0",
    "@angularclass/hmr": "2.1.3",
    "@ngrx/effects": "~8.6.0",
    "@ngrx/entity": "~8.6.0",
    "@ngrx/router-store": "~8.6.0",
    "@ngrx/schematics": "~8.6.0",
    "@ngrx/store": "~8.6.0",
    "@ngrx/store-devtools": "~8.6.0",
    "@types/jasmine": "~3.5.0",
    "@types/jasminewd2": "~2.0.3",
    "@types/lodash-es": "^4.17.3",
    "@types/node": "^12.11.1",
    "classlist.js": "1.1.20150312",
    "codelyzer": "^5.1.2",
    "console-polyfill": "0.3.0",
    "core-js": "^2.5.4",
    "cz-conventional-changelog": "1.2.0",
    "date-fns": "1.30.1",
    "highcharts": "^7.2.1",
    "highcharts-angular": "^2.4.0",
    "html2canvas": "^1.0.0-rc.5",
    "jasmine-core": "~3.5.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.3.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~2.1.0",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.2",
    "lodash-es": "^4.17.11",
    "mime": "~2.4.2",
    "ngrx-store-freeze": "0.2.4",
    "ngx-monaco-editor": "~8.0.0",
    "ngx-quill": "^7.3.12",
    "pdfmake": "^0.1.64",
    "prettier": "1.19.1",
    "protractor": "~5.4.3",
    "quill": "^1.3.7",
    "rxjs": "~6.5.4",
    "rxjs-compat": "^6.0.0",
    "standard-changelog": "1.0.19",
    "svgxuse": "1.2.6",
    "ts-node": "~8.3.0",
    "tsickle": "^0.35.0",
    "tslib": "^1.10.0",
    "tslint": "~5.18.0",
    "typescript": "~3.7.5",
    "web-animations-js": "~2.3.1",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@types/jest": "^24.0.6",
    "jest": "^24.1.0",
    "jest-preset-angular": "^6.0.2",
    "ts-node": "~7.0.1",
    "typescript": "3.2.4"
  },
  "jest": {
    "preset": "jest-preset-angular",
    "setupTestFrameworkScriptFile": "<rootDir>/setupJest.ts"
  },
  "nodemonConfig": {
    "ignore": [
      "**/example-module.ts"
    ],
    "watch": [
      "./a/bunch/of/stuff"
    ],
    "ext": "js ts md html"
  },
  "workspaces": {
    "packages": [
      "packages/*"
    ],
    "nohoist": [
      "**"
    ]
  }
}

Comportement attendu

Un exemple de package.json avec des commentaires.

{
  "name": "my-project",
  "version": "0.0.1",
  "license": "MIT",
  "scripts": {
    "build": "a bunch of scripts",
    "ci": "a bunch of scripts",
    "ci:local": "a bunch of scripts",
    // for building our documentation site
    "docsite": "a bunch of scripts",
    "docsite:combiner": "a bunch of scripts",
    "docsite:sassdoc": "a bunch of scripts",
    "docsite:tsdoc": "a bunch of scripts",
    "e2e": "a bunch of scripts",
    "lint": "a bunch of scripts",
    "sassdoc": "a bunch of scripts",
    "sassdoc:comp": "a bunch of scripts",
    "sassdoc:core": "a bunch of scripts",
    "start": "a bunch of scripts",
    "start:hmr": "a bunch of scripts",
    "start:qa": "a bunch of scripts",
    "start:dev": "a bunch of scripts",
    "generate-examples": "a bunch of scripts",
    "rebuild-markdown": "a bunch of scripts",
    "watch-examples": "a bunch of scripts",
    "test:cov": "a bunch of scripts",

    "test": "jest",
    "test:watch": "jest --watch",
    "test:cc": "jest --coverage"
  },
  "config": {
    "commitizen": {
      "path": "./node_modules/cz-conventional-changelog"
    }
  },
  "dependencies": {
    // ANGULAR
    "@angular-devkit/build-angular": "~0.900.1",
    "@angular-devkit/build-ng-packagr": "~0.900.1",
    "@angular-devkit/core": "~9.0.0",
    "@angular-devkit/schematics": "~9.0.0",
    "@angular/animations": "~9.0.0",
    "@angular/cdk": "~9.0.0",
    "@angular/cli": "~9.0.1",
    "@angular/common": "~9.0.0",
    "@angular/compiler": "~9.0.0",
    "@angular/compiler-cli": "~9.0.0",
    "@angular/core": "~9.0.0",
    "@angular/forms": "~9.0.0",
    "@angular/language-service": "~9.0.0",
    "@angular/platform-browser": "~9.0.0",
    "@angular/platform-browser-dynamic": "~9.0.0",
    "@angular/router": "~9.0.0",
    "@angular/service-worker": "~9.0.0",
    "@angularclass/hmr": "2.1.3",

    "zone.js": "~0.10.2",
    "rxjs": "~6.5.4",
    "rxjs-compat": "^6.0.0",


    // polyfills for angular 
    "console-polyfill": "0.3.0",
    "core-js": "^2.5.4",
    "classlist.js": "1.1.20150312",
    "svgxuse": "1.2.6",
    "web-animations-js": "~2.3.1",

    // lint management

    "codelyzer": "^5.1.2",
    "prettier": "1.19.1",
    "tslint": "~5.18.0",

    // changelog creation
    "cz-conventional-changelog": "1.2.0",
    "standard-changelog": "1.0.19",

    // ngrx state management 
    "@ngrx/effects": "~8.6.0",
    "@ngrx/entity": "~8.6.0",
    "@ngrx/router-store": "~8.6.0",
    "@ngrx/schematics": "~8.6.0",
    "@ngrx/store": "~8.6.0",
    "@ngrx/store-devtools": "~8.6.0",
    "ngrx-store-freeze": "0.2.4",


    // library deps

    // Graphs support
    "highcharts": "^7.2.1",
    "highcharts-angular": "^2.4.0",

    // for creating pdfs
    "html2canvas": "^1.0.0-rc.5",
    "pdfmake": "^0.1.64",

    // rich text support
    "ngx-quill": "^7.3.12",
    "quill": "^1.3.7",




    // testing
    "jasmine-core": "~3.5.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.3.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~2.1.0",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.2",

    // e2e testing
    "protractor": "~5.4.3",

    // typscript and compilation
    "ts-node": "~8.3.0",
    "tsickle": "^0.35.0",
    "tslib": "^1.10.0",
    "typescript": "~3.7.5",

    // misc deps
    "date-fns": "1.30.1",
    "lodash-es": "^4.17.11",
    "mime": "~2.4.2"
  },
  "devDependencies": {
    "@types/jasmine": "~3.5.0",
    "@types/jasminewd2": "~2.0.3",
    "@types/lodash-es": "^4.17.3",
    "@types/node": "^12.11.1",
    "@types/jest": "^24.0.6",
    "jest": "^24.1.0",
    "jest-preset-angular": "^6.0.2",
    "ts-node": "~7.0.1",
    "typescript": "3.2.4"
  },
  // complicated jest configuration here
  "jest": {
    "preset": "jest-preset-angular",
    "setupTestFrameworkScriptFile": "<rootDir>/setupJest.ts"
  },
  // use nodemon to trigger stuff
  "nodemonConfig": {
    "ignore": [
      "**/example-module.ts"
    ],
    "watch": [
      "./a/bunch/of/stuff"
    ],
    "ext": "js ts md html"
  },
  // extra libraries we are creating internally
  "workspaces": {
    "packages": [
      "packages/*"
    ],
    "nohoist": [
      "**"
    ]
  }
}

Les références

https://github.com/microsoft/node-jsonc-parser

Typescript utilise des commentaires dans leurs fichiers tsconfig.json.