javascript - npm WARN ... requires a peer of ... but none is installed. You must install peer dependencies yourself

Question

I tried to run a project downloaded from github. Unfortunately, during npm install the following warnings were shown. I tried to change the version based on this question. However, I had a problem, because some packages require multiple versions other packages. Consider these two lines:

npm WARN @angular/[email protected] requires a peer of @angular/core@^4.3.0 but none is installed. You must install peer dependencies yourself.

npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.

So, installing some packages causes the list of dependencies to grow substantially.

Does anyone have a solution?

npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/core@^4.3.0 but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/common@^4.3.0 but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/core@^4.3.0 but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/common@^4.3.0 but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN @angular/[email protected] requires a peer of @angular/[email protected] but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of @angular/compiler@^2.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of webpack@^3.1.0 but none is installed. You must install peer dependencies yourself.

Here are the contents of package.json:

{
  "name": "fireplace",
  "version": "0.0.0",
  "license": "MIT",
  "angular-cli": {},
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/name/fireplace.git"
  },
  "author": "name",
  "bugs": {
    "url": "https://github.com/name/fireplace/issues"
  },
  "homepage": "https://github.com/name/fireplace",
  "private": true,
  "dependencies": {
    "@angular/animations": "^4.0.0-rc.2",
    "@angular/common": "^4.0.0-rc.2",
    "@angular/compiler": "^4.0.0-rc.2",
    "@angular/compiler-cli": "^4.0.0-rc.2",
    "@angular/core": "^4.0.0-rc.2",
    "@angular/flex-layout": "^2.0.0-rc.1",
    "@angular/forms": "^4.0.0-rc.2",
    "@angular/http": "^4.0.0-rc.2",
    "@angular/material": "^2.0.0-beta.2",
    "@angular/platform-browser": "^4.0.0-rc.2",
    "@angular/platform-browser-dynamic": "^4.0.0-rc.2",
    "@angular/platform-server": "^4.0.0-rc.2",
    "@angular/router": "^4.0.0-rc.2",
    "@types/lodash": "^4.14.53",
    "angular2-google-maps": "^0.17.0",
    "angular2-moment": "^1.2.0",
    "angularfire2": "^2.0.0-beta.8",
    "core-js": "^2.4.1",
    "d3": "^4.7.1",
    "d3-cloud": "^1.2.4",
    "firebase": "^3.6.10",
    "hammerjs": "^2.0.8",
    "lodash": "^4.17.4",
    "rxjs": "^5.2.0",
    "ts-helpers": "^1.1.1",
    "zone.js": "^0.7.6"
  },
  "devDependencies": {
    "@angular/cli": "^1.0.0-rc.1",
    "@angular/compiler-cli": "^2.4.0",
    "@types/jasmine": "2.5.38",
    "@types/node": "~6.0.60",
    "codelyzer": "~2.0.0",
    "jasmine-core": "2.5.2",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "karma-coverage-istanbul-reporter": "^0.2.1",
    "protractor": "~5.1.0",
    "ts-node": "~2.0.0",
    "tslint": "~4.4.2",
    "typescript": "^2.2.1",
    "webpack": "^2.2.1"
  }
}

ng serve returns(I pasted only the beginning and the end):

ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/bidi/index.d.ts (8,99): Cannot find module '@angular/cdk/bidi'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/portal/portal.d.ts (8,85): Cannot find module '@angular/cdk/portal'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/portal/portal-directives.d.ts (8,76): Cannot find module '@angular/cdk/portal'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/portal/dom-portal-host.d.ts (8,31): Cannot find module '@angular/cdk/portal'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/ripple/ripple-renderer.d.ts (9,26): Cannot find module '@angular/cdk/platform'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/ripple/ripple-renderer.d.ts (10,31): Cannot find module '@angular/cdk/scrolling'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/ripple/ripple.d.ts (9,31): Cannot find module '@angular/cdk/scrolling'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/ripple/ripple.d.ts (10,26): Cannot find module '@angular/cdk/platform'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/platform/platform.d.ts (8,26): Cannot find module '@angular/cdk/platform'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/keyboard/keycodes.d.ts (8,146): Cannot find module '@angular/cdk/keycodes'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/core.d.ts (1,61): Cannot find module '@angular/cdk/coercion'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/core.d.ts (2,49): Cannot find module '@angular/cdk/observers'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/core.d.ts (3,32): Cannot find module '@angular/cdk/collections'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/core.d.ts (9,15): Cannot find module '@angular/cdk/platform'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/core.d.ts (10,15): Cannot find module '@angular/cdk/overlay'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/core.d.ts (14,252): Cannot find module '@angular/cdk/a11y'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/autocomplete/autocomplete.d.ts (10,44): Cannot find module '@angular/cdk/a11y'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/autocomplete/autocomplete-trigger.d.ts (10,32): Cannot find module '@angular/cdk/bidi'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/autocomplete/autocomplete-trigger.d.ts (11,67): Cannot find module '@angular/cdk/overlay'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/button/button.d.ts (9,26): Cannot find module '@angular/cdk/platform'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/core/a11y/focus-key-manager.d.ts (8,50): Cannot find module '@angular/cdk/a11y'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/chips/chip-list.d.ts (10,33): Cannot find module '@angular/cdk/a11y'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/chips/chip-list.d.ts (11,32): Cannot find module '@angular/cdk/bidi'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/dialog/dialog-config.d.ts (9,27): Cannot find module '@angular/cdk/bidi'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/dialog/dialog-container.d.ts (10,86): Cannot find module '@angular/cdk/portal'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/dialog/dialog-container.d.ts (11,34): Cannot find module '@angular/cdk/a11y'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/dialog/dialog-ref.d.ts (8,28): Cannot find module '@angular/cdk/overlay'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/dialog/dialog.d.ts (10,31): Cannot find module '@angular/cdk/portal'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/dialog/dialog.d.ts (11,62): Cannot find module '@angular/cdk/overlay'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/datepicker/datepicker.d.ts (9,67): Cannot find module '@angular/cdk/overlay'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/datepicker/datepicker.d.ts (10,32): Cannot find module '@angular/cdk/bidi'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/grid-list/grid-list.d.ts (10,32): Cannot find module '@angular/cdk/bidi'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/input/autosize.d.ts (10,26): Cannot find module '@angular/cdk/platform'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/input/input.d.ts (10,26): Cannot find module '@angular/cdk/platform'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/menu/menu-panel.d.ts (10,27): Cannot find module '@angular/cdk/bidi'.
ERROR in /Users/username/Projects/fireplace/node_modules/@angular/material/typings/menu/menu-directive.d.ts (14,27): Cannot find module '@an

Answer 1

"A requires a peer of B but none was installed". Consider it as "A requires one of B's peers but that peer was not installed and we're not telling you which of B's peers you need."

The automatic installation of peer dependencies was explicitly removed with npm 3.

NPM Blog

Release notes of v3

So you cannot install peer dependencies automatically with npm 3 and upwards.

Updated Solution:

Use following for each peer dependency to install that and remove the error

npm install --save-dev xxxxx

Deprecated Solution:

1. You can use npm-install-peers to find and install required peer dependencies.

   npm install -g npm-install-peers

   npm-install-peers

2. If you are getting this error after updating any package's version then remove node_modules directory and reinstall packages by npm install or npm cache clean and npm install.