@maverickcer/env-cap
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    Interface BuildFileSystem

    The filesystem capability a package's ./build entry requires from its caller.

    ./build is a library surface: it must not acquire filesystem access implicitly (no node:fs import outside the package's CLI). Every public options object carries a required fs field of this type, and the caller supplies a concrete adapter: the CLI builds one over node:fs/promises; a test builds either that same adapter or an in-memory fake.

    "Ambient-fs-free" means specifically: ./build never reaches for node:fs itself. It still performs real filesystem operations -- the capability is always handed in.

    The shape is modeled on node:fs/promises's own signatures so a thin adapter is a drop-in value, but uses minimal structural types (BuildDirent/BuildStats) rather than Node's Dirent/ Stats -- the capability boundary shouldn't leak Node's type surface just because the concrete adapter happens to be Node-backed. Only the operations the build code actually calls are here.

    interface BuildFileSystem {
        mkdir: (path: string, options: { recursive: true }) => Promise<void>;
        readdir: (
            path: string,
            options: { withFileTypes: true },
        ) => Promise<readonly BuildDirent[]>;
        readFile: (path: string, encoding: "utf8") => Promise<string>;
        realpath: (path: string) => Promise<string>;
        stat: (path: string) => Promise<BuildStats>;
        writeFile: (path: string, data: string, encoding: "utf8") => Promise<void>;
    }
    Index
    mkdir readdir readFile realpath stat writeFile
    mkdir: (path: string, options: { recursive: true }) => Promise<void>

    Create a directory and every missing parent. A no-op if it already exists.

    readdir: (
        path: string,
        options: { withFileTypes: true },
    ) => Promise<readonly BuildDirent[]>

    List a directory's entries with their file-type info.

    readFile: (path: string, encoding: "utf8") => Promise<string>

    Read a UTF-8 text file. Rejects if the path doesn't exist or isn't readable.

    realpath: (path: string) => Promise<string>

    Resolve a path to its canonical, symlink-free absolute form.

    stat: (path: string) => Promise<BuildStats>

    Stat a path (following symlinks). Rejects if the path doesn't exist.

    writeFile: (path: string, data: string, encoding: "utf8") => Promise<void>

    Write a UTF-8 text file, creating or truncating it. The parent directory must already exist.

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