Expect for TypeScript

expect.ts

import { spawn as expectSpawn } from 'node-pty';

export async function expect(cmd: string, expectations: { expected: string, retort: string }[], dir?: string) {

    let cmdSplit = cmd.split(' ')
    const p = expectSpawn(cmdSplit.shift()!, cmdSplit, { cwd: dir })

    p.onData((data) => {
        console.log(data)
        const expected = expectations.shift()
        if (!expected) {
            throw new Error('Unexpected output: ' + data)
        }
        if (data.includes(expected.expected)) {
            p.write(expected.retort + '\n')
        }
    })

}

Added this to be able to use the Prisma CLI tools non-interactive.

Like:

expect('npx prisma migrate dev --name "my migration"', [{ expected: 'apply this migration?', retort: 'y' }], publishDir)