Erroneous error when index.d.ts is included in the files list as "/index.d.ts"

[chocolateboy]

tsd: 0.13.1 | Node.js: v14.9.0 | OS: Linux (Arch)

I have a files array which includes "/index.d.ts", e.g.:

{
    "files": [
        "dist/index.esm.js",
        "dist/index.js",
        "/index.d.ts"
    ]
}

The leading slash is needed to include the index.d.ts file in the package's root directory and to exclude other files of the same name, e.g. in the dist directory (an unqualified "index.d.ts" pattern matches all files with that name).

tsd is not picking this up and is failing with an error:

TypeScript type definition index.d.ts is not part of the files list.

The error goes away if the forward slash is removed.

[chocolateboy]

The documentation says "file patterns follow a similar syntax to .gitignore". In .gitignore, forward slash just means directory separator:

The slash / is used as the directory separator. Separators may occur at the beginning, middle or end of the .gitignore search pattern.

If there is a separator at the beginning or middle (or both) of the pattern, then the pattern is relative to the directory level of the particular .gitignore file itself.

And, no, "./index.d.ts" doesn't work. It adds ./dist/index.d.ts but not ./index.d.ts.

[fregante]

Regardless of documentation (which says "similar", but doesn't commit to the same exact format), I confirm that npm@6.14.5 also includes files starting with a slash.