Automatic Semicolons Insertion

Automatic Semicolons Insertion

//https://github.com/getify/You-Dont-Know-JS/blob/master/types%20&%20grammar/ch5.md#automatic-semicolons

"It's important to note that ASI will only take effect in the presence of a new-line (aka line-break).
Semicolons are not inserted in the middle of a line.

Basically, if the JS parser parses a line where a parser error would occur (a missing expected ;),
and it can reasonably insert one, it does so. What's reasonable for insertion?
Only if there's nothing but whitespace and/or comments between the end of some statement and that 
line's new-line/line break."

"...In my view, the only way a parser error occurs is if it's given an incorrect/errored program to parse.
So, while ASI is strictly correcting parser errors, the only way it can get such errors to correct is 
if there were first program authoring errors -- omitting semicolons where the grammar rules require them.

So, to state it more bluntly, when I hear someone claim that they want to omit "optional semicolons",
my brain translates that claim to "I want to write the most parser-broken program I can that can still work."

https://github.com/getify/You-Dont-Know-JS/blob/master/types%20&%20grammar/ch5.md#automatic-semicolons