[llvm-bugs] [Bug 49960] New: clang-format doesn't handle ASI after "return" on JavaScript

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49960

            Bug ID: 49960
           Summary: clang-format doesn't handle ASI after "return" on
                    JavaScript
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: i at outv.im
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Sample code:

```
function t() {
  if (true) return
  const v = 42
}
```

clang-format result:

```
function t() {
  if (true)
    return const v = 42
}
```

which is incorrect in grammar.

According to ECMA262 12.9.1 [1], a semicolon should be automatically inserted
after "return" for the code sample (also, there's is an example in 12.9.2 like
this). After manually inserting a semicolon after "return", the clang-format
returns the correct formatting result.

1. https://tc39.es/ecma262/#sec-rules-of-automatic-semicolon-insertion

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