Simple NodeJS script that I used to create a list of all possible permutations of call chains for Vitest.

calculate-permutations.js

// This script creates a list of all possible permutations of call chains based on the Vitest Test API Reference (https://vitest.dev/api/).
// I used this to improve a package called veritem/eslint-plugin-vitest.
// For further context see: https://github.com/veritem/eslint-plugin-vitest/issues/275.

const fs = require("fs");
const percom = require("percom");

const data = [
    {
        names: ["beforeEach", "beforeAll", "afterEach", "afterAll"],
        methods: [],
    },
    {
        names: ["it", "test"],
        methods: ["extend", "skip", "skipIf", "runIf", "only", "concurrent", "todo", "fails", "each"],
    },
    {
        names: ["bench"],
        methods: ["skip", "only", "todo"],
    },
    {
        names: ["describe"],
        methods: ["skip", "skipIf", "only", "concurrent", "sequential", "shuffle", "todo", "each"],
    },
];

const DEPTH = 3;

const allPermutations = [];

data.forEach((q) => {
    q.names.map((name) => {
        allPermutations.push(name);

        const maxDepth = Math.min(DEPTH, q.methods.length);
        for (let i = 0; i < maxDepth; i++) {
            const perms = percom.com(q.methods, i + 1);
            const allPerms = perms.map((p) => [name, ...p].join("."));
            allPermutations.push(...allPerms);
        }
    });
});

console.log(allPermutations);