Support pnpm package manager resolution

[dont-doubt]

Add detection and command configuration for pnpm in mkPackageManagerCmds() (src/util.ts)

[IcaroG]

Suggested change

	cmd: "pnpm dlx",
	cmd: "pnpm",

To make it similar to yarn, I think it would be better for this to be just pnpm

[dont-doubt]

Thanks for the suggestion! However, pnpm dlx should not be replaced by pnpm:

• pnpm foo attempts to run a local script or a binary foo from node_modules/.bin, and will fail if the package isn't already installed.

• pnpm dlx foo downloads and runs package foo without installing it locally, similar to npx. This is the expected behavior.

[IcaroG]

Looking at the current usage, I think the correct thing to do would be to use the local binary for this.
It is used to build (the user should have their platform installed locally) and to sync (the user should have the CLI locally and we should use the version they have). From what I understand, npx checks if the package is installed locally before executing it (in this case it should)

[dont-doubt]

From what I understand, npx checks if the package is installed locally before executing it (in this case it should)

Using pnpm dlx also ensures that package is installed locally before executing it.

In code, "cmd" property is used for plasmic sync and next/gatsby binaries. It's absolutely correct usage for "pnpm dlx" here:

    await exec(
      // pnpm dlx plasmic ...
      `${pm.cmd} plasmic sync --projects '${this.args.projectId}:${this.args.projectApiToken}' --yes`,
      this.opts
    );
    // ...
      case "nextjs":
      // pnpm dlx next ...
        await exec(`${pm.cmd} next build`, this.opts);
        await exec(`${pm.cmd} next export`, this.opts);
        dir = "out";
        break;
      case "gatsby":
    // pnpm dlx gatsby ...
        await exec(`${pm.cmd} gatsby build`, this.opts);
        dir = "public";
        break;

"pnpm dlx" is exact pnpm mirror for "npx" command. In other words, if we want “npx-style” behavior (i.e. fetch if missing, then run), we should use "pnpm dlx" and neither "pnpm" nor any other pnpm command. Therefore, I recommend keeping "pnpm dlx", as using "pnpm" will just break the code.

[IcaroG]

The issue is, if I have a specific next version in the project I want that version to be used. All the packages you listed will be in the users package.json and that specific version should be used.
Can you link me any docs that specify that pnpm dlx will prefer the local binary over downloading the latest version from the internet? From what I saw, it said that i would always download from the internet before executing

[IcaroG]

To avoid issues, I think it should be fine to change the npm one to be npm exec