'Restrict Gutenberg Blocks to Single Use

I've got my blocks registered properly and functioning.
My only gripe is that I don't want the blocks to be used more than once in the same post.
Is it possible to restrict block behavior like this? The documentation is horrible.

wordpress-gutenberg

Solution 1:^[1]

When registering your own blocks, you can set the multiple option of the supports property to false:

supports: {
    // Use the block just once per post
    multiple: false
}

Source: https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/#multiple.

Solution 2:^[2]

in block.json set "multiple" to false in "supports":

"category": "widgets",
"icon": "smiley",
"supports": {
    "html": false,
    "multiple": false
},
"attributes": {

Sources

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Source: Stack Overflow

Solution	Source
Solution 1	greybeard
Solution 2	Marc

'Restrict Gutenberg Blocks to Single Use

Solution 1:[1]

Solution 2:[2]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]