Feature Request: check whether internal links correspond to a name/id

[mikesamuel]

Some markdown documents have far more internal fragment links than external. It'd be nice if those could be sanity checked.

// Ideally would error since there is no #foo
markdownLinkCheck(
    `[example](#foo)`,
    (err, results) => { ... })

// No error since there is an explicit name created
markdownLinkCheck(
    `
<a name="foo"> foo </a>

[example](#foo)`,
    (err, results) => { ... })

// No error since there is a link target based on header auto-linking
markdownLinkCheck(
    `
# foo

[example](#foo)`,
    (err, results) => { ... })

[NicolasMassart]

@mikesamuel Could this issue be merged with #91 in your opinion?

[mikesamuel]

@NicolasMassart Yes. It looks like Joel's output catches same-document anchors:

[✖] #user-content-query---v3-search-endpoint

[NicolasMassart]

Thanks. Let's say it's a duplicate then (no offense!)

[mikesamuel]

@NicolasMassart No offense taken. Thanks for markdown-link-check.