feat(parser): add onInsertedSemicolon option

[dmichon-msft]

Adds support for the onInsertedSemicolon callback option, matching the base behavior of the acorn option of the same name. This option is used by webpack to identify when replacing the text of a node with a parenthesized expression would run afoul of a difference in runtime behavior if automatic semicolon insertion occurred.

Motivating example:

console.log('hi!') // ASI occurs here
foo() // ASI occurs here
console.log(foo.name)

If webpack replaces foo with the imported expression (0,some_module.foo), the resulting code has the runtime behavior of

console.log('hi!')(0,some_module.foo)() // tried to call the result of `console.log`, TypeError
console.log((0,some_module.foo).name) // Correct code

On the other hand, if webpack tries to always insert a semicolon, we instead have

console.log('hi') // ASI not needed
;(0,some_module.foo)() // Correct code
console.log(;(0,some_module.foo).name) // Syntax error

Ultimately this is an issue because webpack doesn't perform all transforms on the AST layer and run the code through a printer for performance reasons.

The lack of this option is the one difference in behavior between acorn and meriyah that would potentially impact using meriyah in webpack for a 20-30% AST parse performance boost.

Adds a basic unit test for the feature.

[3cp]

The change looks trivial! Glad it's easy to meet your requirement.

[3cp]

v4.4.0 is released.