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Promise chaining is how promises work. It is recommended that you use promise chains because it makes code easier to follow and to read. For example, if you wanted to create a loop using promises, it could look like this:
We are writing the installer routine and to make it async we must return the Promise. Promise returns a value, it does not return a callback. Promise returns a value, and that happens only after the callback was called, which is set to return a value.
The injected async function also returns a promise, which will be chained automatically when we await it, which means all the code is still async; we just happen to be waiting for a promise before continuing.
The code, await page.pdf("insert_your_file.pdf"), takes a few seconds, but this should not interrupt the program. When we set it to async, it takes place in a different context than that of the thread.
The thread goes to sleep, and when the downloaded file is completed, the pool worker wakes up and starts downloading the next page, goes back to sleep, and so on. As you can see, we are blocking the asynchronous main thread from progressing. If you are familiar with threading in the language, you may be wondering how the thread that just got woken returns to the previous page that was completed. d2c66b5586