Is it possible to get the bigrams of: [alpha bravo bravo, charlie delta, alpha bravo]

Ideally I'd like a return of

2 alpha bravo
1 bravo bravo
1 charlie delta
0 bravo charlie
0 delta alpha

Perhaps my inputs are wrong, but it seems to be crossing the boundaries to return

2 alpha bravo
1 bravo bravo
1 charlie delta
1 bravo charlie
1 delta alpha

I'm trying to use const { bigram, trigram, nGram } = require('n-gram');

but I'm getting the error

Error [ERR_REQUIRE_ESM]: require() of ES Module C:\Users\x\x\x\x\node_modules\n-gram\index.js from C:\Users\x\x\x\x\server.js not supported. Instead change the require of index.js in C:\Users\x\x\x\x\server.js to a dynamic import() which is available in all CommonJS modules. at Object.<anonymous> (C:\Users\x\x\x\x\server.js:8:36) { code: 'ERR_REQUIRE_ESM'

It doesn't seem to avoid duplicates... In an index, duplicates should be avoided to improve the performance.

I tried putting an array rather than a string in, but it still treated it like a joined string. Is there any way in which n-grams of words rather than characters can be supported?

Thanks!