How to install npm peer dependencies automatically

Question

For example  when I install Angular2   npm install --save angular2 temp 1 0 0  Users doug Projects dougludlow temp  -- angular2 2 0 0-beta 3   -- UNMET PEER DEPENDENCY es6-promise  3 0 2  -- UNMET PEER DEPENDENCY es6-shim  0 33 3  -- UNMET PEER DEPENDENCY reflect-metadata 0 1 2  -- UNMET PEER DEPENDENCY rxjs 5 0 0-beta 0  -- UNMET PEER DEPENDENCY zone js 0 5 11  npm WARN angular2 2 0 0-beta 3 requires a peer of es6-promise  3 0 2 but none was installed  npm WARN angular2 2 0 0-beta 3 requires a peer of es6-shim  0 33 3 but none was installed  npm WARN angular2 2 0 0-beta 3 requires a peer of reflect-metadata 0 1 2 but none was installed  npm WARN angular2 2 0 0-beta 3 requires a peer of rxjs 5 0 0-beta 0 but none was installed  npm WARN angular2 2 0 0-beta 3 requires a peer of zone js 0 5 11 but none was installed    Is there a magic flag that I can pass to npm that will install the peer dependencies as well  I haven t been able to find one    It s tedious to manually copy and paste the peer dependencies and make sure I have the correct versions   In other words  I d rather not have to do   npm install --save angular2 2 0 0-beta 3 es6-promise  3 0 2 es6-shim  0 33 3 reflect-metadata 0 1 2 rxjs 5 0 0-beta 0 zone js 0 5 11   What is the better way

User · Answer

Install yarn an then run   yarn global add install-peerdeps

User · Answer

I experienced these errors when I was developing an npm package that had peerDependencies  I had to ensure that any peerDependencies were also listed as devDependencies  The project would not automatically use the globally installed packages

User · Answer

I solved it by rewriting package json with the exact values warnings were about  Warnings when running npm  npm WARN angular2 2 0 0-beta 3 requires a peer of es6-shim  0 33 3 but none was installed  npm WARN angular2 2 0 0-beta 3 requires a peer of reflect-metadata 0 1 2  In package json  write  quot es6-shim quot    quot  0 33 3 quot    quot reflect-metadata quot    quot 0 1 2 quot    Then  delete node modules directory  Finally  run the command below  npm install

User · Answer

The automatic install of peer dependencies was explicitly removed with npm 3  as it cause more problems than it tried to solve  You can read about it here for example   https   blog npmjs org post 110924823920 npm-weekly-5 https   github com npm npm releases tag v3 0 0  So no  for the reasons given  you cannot install them automatically with npm 3 upwards  NPM V7 NPM v7 has reintroduced the automatic peerDependencies installation  They had made some changes to fix old problems as version compatibility across multiple dependants  You can see the discussion here and the announcement here Now in V7  as in versions before V3  you only need to do an npm i and all peerDependences should be automatically installed

User · Answer

Cheat code helpful in this scenario and some others     -- UNMET PEER DEPENDENCY  angular common 4 0 2  -- UNMET PEER DEPENDENCY  angular compiler 4 0 2  -- UNMET PEER DEPENDENCY  angular compiler-cli 4 0 2  -- UNMET PEER DEPENDENCY  angular core 4 0 2  -- UNMET PEER DEPENDENCY  angular forms 4 0 2  -- UNMET PEER DEPENDENCY  angular http 4 0 2  -- UNMET PEER DEPENDENCY  angular platform-browser 4 0 2  -- UNMET PEER DEPENDENCY  angular platform-browser-dynamic 4 0 2  gt    copy  amp  paste your error into your code editor  Highlight an unwanted part with your curser  In this case  -- UNMET PEER DEPENDENCY Press command   d a bunch of times  Press delete twice   Press space if you accidentally highlighted  -- UNMET PEER DEPENDENCY   Press up once  Add npm install Press down once  Add --save Copy your stuff back into the cli and run  npm install  angular common 4 0 2  angular compiler 4 0 2  angular compiler-cli 4 0 2  angular core 4 0 2  angular forms 4 0 2  angular http 4 0 2  angular platform-browser 4 0 2  angular platform-browser-dynamic 4 0 2 --save

User · Answer

Execute this  npm install-test

User · Answer

The project npm-install-peers will detect peers and install them   As of v1 0 1 it doesn t support writing back to the package json automatically  which would essentially solve our need here    Please add your support to issue in flight  https   github com spatie npm-install-peers issues 4

[node.js] How to install npm peer dependencies automatically?

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