make deps raises an error about yarn

[aqjune]

When I am running make deps, I am seeing this error:

~/vscode-ocaml-platform$ make deps
make yarn-deps
make[1]: Entering directory '/home/aqjune/vscode-ocaml-platform'
yarn --immutable
Usage: yarn [options]

yarn: error: no such option: --immutable
make[1]: *** [Makefile:9: yarn-deps] Error 2
make[1]: Leaving directory '/home/aqjune/vscode-ocaml-platform'
make: *** [Makefile:13: deps] Error 2

OS is Ubuntu. Which package should I apt install?
I am following https://github.com/ocamllabs/vscode-ocaml-platform/blob/master/CONTRIBUTING.md but at the document does not tell how to install preprequired yarn.

---

Okay, I could install yarn using npm install -g yarn@latest! However I met

$ make deps
make yarn-deps
make[1]: Entering directory '/home/aqjune/vscode-ocaml-platform'
yarn --immutable
➤ YN0000: · Yarn 4.0.2
➤ YN0000: ┌ Resolution step
➤ YN0014: │ astexplorer@file:/home/aqjune/vscode-ocaml-platform/astexplorer: Only some patterns can be imported from legacy lockfiles (not "file:astexplorer")
➤ YN0085: │ + @biomejs/biome@npm:1.5.2, @swc-node/register@npm:1.6.8, @swc/core@npm:1.3.104, @tsconfig/node20@npm:20.1.2, @tsconfig/strictest@npm:2.0.2, @types/fs-extra@npm:11.0.4, and 596 more.
➤ YN0000: └ Completed in 3m 29s
➤ YN0000: ┌ Post-resolution validation
➤ YN0028: │ The lockfile would have been modified by this install, which is explicitly forbidden.
➤ YN0000: └ Completed
➤ YN0000: · Failed with errors in 3m 29s
make[1]: *** [Makefile:9: yarn-deps] Error 1
make[1]: Leaving directory '/home/aqjune/vscode-ocaml-platform'
make: *** [Makefile:13: deps] Error 2

Do you have any idea about this issue? I am using ECMAScript 21 (nvm install 21).

[aqjune]

Running yarn install resolved this issue..! :)

[smorimoto]

You need to use a newer version of yarn, probably because the yarn in your environment is outdated. yarn v1 is already deprecated and it's recommended to switch to yarn v4.

[smorimoto]

The lockfile error is weird, but immutable flag is not required 🙂