Return start position of export statements

[overlookmotel]

It appears that #36 is stalled for now and is a tricky problem to solve.

Would it be possible just to return the start position of export statements?

My aim is to parse export statements in a file without parsing the entire file. With just the start position, this would be achievable without a lot of overhead:

1. Get start position of export statement from es-module-lexer.
2. Get slice of file content from start position of the export statement to end of the file.
3. Pass that slice to a parser with instruction to bail out after 1 statement.

From #36, it sounds like finding the start of export statements is the easy part, and would be inexpensive, but it's finding the end which is hard.

Would you consider supporting this as a stopgap until full export parsing is supported?

[guybedford]

We now support export binding information from #119.

Extending this to full export statement tracking is a logical next step.