console.clear is not synchronous

[dev-nicolaos]

Environment

• Windows 10 Home version 1909
• Deno version 0.27.0

Steps to Reproduce

1. Create a file test.js

// test.js
console.clear();
console.log('Hello World')

2. Run deno test.js

Observed Behaivor

Program exits, Hello World is not visible in the terminal. I see a flash where it looks like it may be printed but then cleared a split second later.

Expected Behaivor

Because console.log is invoked after console.clear, I would expect the terminal to be cleared and then print Hello World, so that the text is visible after the program exits. I executed an equivalent test in Node, FF console, and Chrome console and got this behavior (except that the browsers print the message Console was cleared.; I'm thankful deno doesn't).

Notes

I believe this may be an issue with synchronicity because I can "fix" it by doing...

console.clear();
setTimeout(() => console.log('Hello World'), 100)