npm error trying to init in node 15.0.1

Initializing a new project cdk init app --language typescript fails on macOS 10.15.7 using node 15.0.1 and npm 7.0.3 with error “Cannot read property ‘matches’ of undefined”.

Reproduction Steps

Running node 15.0.1 and npm 7.0.3 on macOS 10.15.7 npm i -g aws-cdk cd empty-folder cdk init app --language typescript

What did you expect to happen?

Project initialised without errors

What actually happened?

Output error “Cannot read property ‘matches’ of undefined” in console, and the following in debug log

291 verbose stack TypeError: Cannot read property 'matches' of undefined
291 verbose stack     at Arborist.[canPlaceDep] (/Users/julianminde/.nvm/versions/node/v15.0.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:1284:15)
291 verbose stack     at Arborist.[placeDep] (/Users/julianminde/.nvm/versions/node/v15.0.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:1061:36)
291 verbose stack     at Arborist.[placeDep] (/Users/julianminde/.nvm/versions/node/v15.0.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:1212:41)
291 verbose stack     at /Users/julianminde/.nvm/versions/node/v15.0.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:766:46
291 verbose stack     at Array.map (<anonymous>)
291 verbose stack     at Arborist.[buildDepStep] (/Users/julianminde/.nvm/versions/node/v15.0.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:766:8)
291 verbose stack     at async Arborist.buildIdealTree (/Users/julianminde/.nvm/versions/node/v15.0.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/build-ideal-tree.js:202:7)
291 verbose stack     at async Promise.all (index 1)
291 verbose stack     at async Arborist.reify (/Users/julianminde/.nvm/versions/node/v15.0.1/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:121:5)
291 verbose stack     at async install (/Users/julianminde/.nvm/versions/node/v15.0.1/lib/node_modules/npm/lib/install.js:40:5)
292 verbose cwd /Users/julianminde/aws/hello-cdk
293 verbose Darwin 19.6.0
294 verbose argv "/Users/julianminde/.nvm/versions/node/v15.0.1/bin/node" "/Users/julianminde/.nvm/versions/node/v15.0.1/bin/npm" "install"
295 verbose node v15.0.1
296 verbose npm  v7.0.3
297 error Cannot read property 'matches' of undefined
298 verbose exit 1

Environment

• CLI Version : aws-cli/2.0.56 Python/3.7.4 Darwin/19.6.0 exe/x86_64
• Framework Version: 1.71.0 (build 953bc25)
• Node.js Version: 15.0.1
• OS : macOS 10.15.7
• Language (Version):

Other

I still fear this being a problem with my environment, however I have tried installing node both from brew and using nvm with the same results, and when I use nvm with node version 14.15.0 it seems to work fine.

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This is 🐛 Bug Report

[sannies]

I ran into the same issue. After npm install -g npm@latest I could no longer reproduce. Perhaps you want to give it a try.

[pgollucci]

This is an npm 7.x issue. npm@latest is still on 6.x