You must install peer dependencies yourself. npm WARN requires a peer of 16.6.1 but none is installed. On the npm 6 window, grommet is installed with missing peer dependency warnings: $ npm i npm WARN requires a peer of 16.12.0 but none is installed. Then we add a dependency, grommet, at lines 15 - 17: $ ls -l node_modules/ total 0 drwxr-xr-x 7 fuje staff 224 Dec 21 21:38 js-tokens drwxr-xr-x 10 fuje staff 320 Dec 21 21:38 loose-envify drwxr-xr-x 6 fuje staff 192 Dec 21 21:38 object-assign drwxr-xr-x 11 fuje staff 352 Dec 21 21:38 react The following command verifies that there are four packages installed inside node_modules. It can print more of the tree by using -depth= to set a specific depth, or it can use -all to print all of them. npm ls only prints the first level of dependencies by default. npm i simply states that four packages are installed inside node_modules. This can be verified by npm ls: $ npm ls /Users/fuje/npm7 └── speaking, npm 7 output is shorter and clearer. This can be verified by npm ls: $ npm ls /Users/fuje/npm6 └── UNMET PEER DEPENDENCY 16.12.0 npm ERR! peer dep missing: 16.12.0, required by the npm 7 window, the peer dependency, React, is installed by npm 7: $ npm i added 4 packages, and audited 4 packages in 5s found 0 vulnerabilities up to date in 0.572s found 0 vulnerabilities npm WARN No description npm WARN No repository field. npm WARN requires a peer of 16.12.0 but none is installed. On the npm 6 window, the peer dependency, React, is not installed by npm 6: $ npm i npm notice created a lockfile as package-lock.json. (If both npm 6 and npm 7 yield the same result, we only attach the result from npm 7.) $ npm init -y Wrote to /Users/fuje/npm7/package.json: Īdd a peer dependency (lines 12 -14) in the generated package.json file: In each npm window, initialize an npm project:
Ensure that a validly matching peer dependency is found at or above the peer dependency’s location in the node_modules tree.Automatically install peer dependencies along with packages that peer-depend on them.There are three peer dependency changes in npm 7: But starting from version 7, npm resumed automatically installing peer dependencies with help from the Arborist algorithm. Starting from version 4, npm dropped support for installing peer dependencies automatically due to the technical challenges of the deduplication algorithm.
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