In nightly, @require doesn't work as intended

[arantius]

Greasemonkey: 2012.07.16.nightly
Test script: https://gist.github.com/3143842

Will log:

Error: library is not defined
Source File: file:///.../gm_scripts/Require_Test/require-test.user-1.js
Line: 12

This has got to be due to the recent injection change to use line numbers (#1404) which eval'ed each section of the script separately .. in its own anonymous wrapper, separating the namespaces, which was not intended.

[arantius]

I think the only reason we still anon-wrap by default is the old "var sidebar" issue:
https://groups.google.com/d/topic/greasemonkey-dev/A6RwuonRvXw/discussion

Way back in 2008 we removed it, hit that, put it back and haven't touched it. We still wrap if there is a bare return, otherwise the script just fails to run -- in this eval with lines scheme, just the one (require or script) thing would fail to run.

So right now I'm trying to reproduce the "var sidebar" issue, goal being finding a different solution to that, and removing the anon wrapper by default. So I made https://gist.github.com/3228230 and tried:

Greasemonkey development head, Firefox 15 beta: Runs fine.
Greasemonkey 0.9.20, Firefox 3.6.28: Runs fine.
Greasemonkey 0.8.20100408.6, Firefox 2.0.0.20: Finally a failure:

Error: Illegal value
Source File: file:///.../gm_scripts/sidebar_error/sidebar_error.user.js
Line: 57

Line 57 is var sidebar;. So I continued narrowing:

Greasemonkey 0.8.20100408.6, Firefox 3.6.28: Fails, same.

So this is only broken in Greasemonkey 0.8? Maybe the don't wrap "temporary workaround" won't be so temporary.

[arantius]

More test cases, separate files, still all in https://gist.github.com/3228230

Firefox 2.0.0.20, Greasemonkey 0.8.20100408.6:
"var x" and "var x equals" give illegal value. "x equals" gives component unavailable.

Firefox 3.6.28, Greasemonkey 0.8.20100408.6:
"var x" and "var x equals" give "redeclaration of const" for navigator and then window. "x equals" gives component unavailable.
Comment out the redeclared consts and we get illegal value like Firefox 2.

Firefox 3.6.28, Greasemonkey 0.9.0:
"x equals" and "var x equals" give component not available. "var x" runs fine (assuming navigator/window are commented).

Firefox 4.0.1, Greasemonkey 0.9.0:
No errors logged. Log lines at the bottom of all three versions complete successfully.

Firefox 15 beta, Greasemonkey 0.9.0:
No errors logged. Log lines at the bottom of all three versions complete successfully.

Firefox 15 beta, Greasemonkey development head:
No errors logged. Log lines at the bottom of all three versions complete successfully.

Failure messages look like:

Error: Illegal value
Source File: file:///.../gm_scripts/sidebar_error/var_x.user.js
Line: 60

and

Error: Component is not available
Source File: file:///.../gm_scripts/x_equals/x_equals.user.js
Line: 16    

This is a reproduction of both style of errors mentioned in the history of this bug, in various Firefox/Greasemonkey versions. But never in recent versions of both. This makes me much more confident that the bug is squashed enough to consider fully dead for 1.0 development.

[arantius]

If you do @grant none, then in GM dev head, you'll see:

  Error: setting a property that has only a getter
  Source file: file:///.../gm_scripts/X_Equals/x-equals.user.js
  Line: 15

Only for "x equals". For most of the IDL properties. But the error message is extremely clear and points to the specific line in question. I'm comfortable leaving that much; use of these variable names isn't super common. And of course this is the same behavior you'd see in standard JS in a page.