Stone.js API
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    CLI_PLUGIN_CONTRACT: "cliPlugin" = 'cliPlugin'

    The package.json field a first-party module uses to advertise its CLI plugin.

    e.g. "stone": { "cliPlugin": "./dist/cli.js" } — the value is a path, inside the package, to a module whose default export (or the module itself) is a StoneCliPlugin.