[Q&A] truffleがインストールできません

truffleがインストールできません

例）
truffleでDappの開発をしようと思っています。
そこでターミナルからインストールを試みたのですが、エラーが出てしまいました

発生している問題・エラー

$ npm install -g truffle

↑こちらで実行
（npmのバージョンは8.6.0, nodeはv16.6.1です。）

パソコンごと初期化して、全部インストールし直した方が早いんですかね？
解決方法がわかる方教えていただけますでしょうか。

該当するソースコード

Need to install the following packages:
  truffle
Ok to proceed? (y) y
npm WARN deprecated mkdirp-promise@5.0.1: This package is broken and no longer maintained. 'mkdirp' itself supports promises now, please switch to that.
npm WARN deprecated har-validator@5.1.5: this library is no longer supported
npm WARN deprecated fsevents@2.1.3: "Please update to latest v2.3 or v2.2"
npm WARN deprecated ipld-raw@6.0.0: This module has been superseded by the multiformats module
npm WARN deprecated circular-json@0.5.9: CircularJSON is in maintenance only, flatted is its successor.
npm WARN deprecated cids@1.1.9: This module has been superseded by the multiformats module
npm WARN deprecated debug@4.1.1: Debug versions >=3.2.0 <3.2.7 || >=4 <4.3.1 have a low-severity ReDos regression when used in a Node.js environment. It is recommended you upgrade to 3.2.7 or 4.3.1. (https://github.com/visionmedia/debug/issues/797)
npm WARN deprecated uuid@2.0.1: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
npm WARN deprecated @nodefactory/filsnap-adapter@0.2.2: Package is deprecated in favour of @chainsafe/filsnap-adapter
npm WARN deprecated ipld-dag-cbor@0.17.1: This module has been superseded by @ipld/dag-cbor and multiformats
npm WARN deprecated multicodec@1.0.4: This module has been superseded by the multiformats module
npm WARN deprecated uuid@3.4.0: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
npm WARN deprecated uuid@3.2.1: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
npm WARN deprecated uuid@3.2.1: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
npm WARN deprecated uuid@3.2.1: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
npm WARN deprecated multibase@4.0.6: This module has been superseded by the multiformats module
npm WARN deprecated multibase@4.0.6: This module has been superseded by the multiformats module
npm WARN deprecated multibase@4.0.6: This module has been superseded by the multiformats module
npm WARN deprecated multibase@3.1.2: This module has been superseded by the multiformats module
npm WARN deprecated uuid@3.3.2: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
npm WARN deprecated mkdirp@0.5.1: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated ipld-dag-pb@0.20.0: This module has been superseded by @ipld/dag-pb and multiformats
npm WARN deprecated multibase@0.6.1: This module has been superseded by the multiformats module
npm WARN deprecated multibase@0.7.0: This module has been superseded by the multiformats module
npm WARN deprecated multicodec@0.5.7: This module has been superseded by the multiformats module
npm WARN deprecated node-pre-gyp@0.11.0: Please upgrade to @mapbox/node-pre-gyp: the non-scoped node-pre-gyp package is deprecated and only the @mapbox scoped package will recieve updates in the future
npm WARN deprecated multicodec@3.2.1: This module has been superseded by the multiformats module
npm WARN deprecated multicodec@2.1.3: This module has been superseded by the multiformats module
npm WARN deprecated multicodec@2.1.3: This module has been superseded by the multiformats module
npm WARN deprecated multicodec@2.1.3: This module has been superseded by the multiformats module
npm WARN deprecated axios@0.20.0: Critical security vulnerability fixed in v0.21.1. For more information, see https://github.com/axios/axios/pull/3410
npm WARN deprecated cids@0.7.5: This module has been superseded by the multiformats module
npm WARN deprecated core-js@2.6.12: core-js@<3.4 is no longer maintained and not recommended for usage due to the number of issues. Because of the V8 engine whims, feature detection in old core-js versions could cause a slowdown up to 100x even if nothing is polyfilled. Please, upgrade your dependencies to the actual version of core-js.

自分で試したこと

コードにある通り、npmでなくて、npx truffleで実行してみたのですが、エラーになってしまいました、、

1Answer

@robozushi10 posted at 2022-04-11

私は truffle に関する知見は一切無いので、見当違いでしたら申し訳ありませんが、
気になった点をご連絡します.

掲載されているログは、エラーでは無くて「警告」ではないでしょうか？.
つまり、truffle というパッケージはインストールされているような気がします.

私の環境 (Ubuntu 18.04 で npm 8.6.0 を使用した) でも、
掲載されているログと同じ警告が表示されましたが、truffle 5.5.9 がインストールされていました.

sudo npm install -g truffle の後

$ npm --version
8.6.0

$ npm list 
/usr/local/lib
略
└── truffle@5.5.9

その後、次のように truffle init が実行できました.

$ truffle init

Starting init...
================

> Copying project files to /home/foo/tmp

Init successful, sweet!

Try our scaffold commands to get started:
  $ truffle create contract YourContractName # scaffold a contract
  $ truffle create test YourTestName         # scaffold a test

http://trufflesuite.com/docs

truffleがインストールできません

truffleがインストールできません

発生している問題・エラー

該当するソースコード

自分で試したこと

1Answer

sudo npm install -g truffle の後

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