* Removed the deprecated jsx pragma detection code and the concerned tests that included jsx-pragma
* Removed extra tests
* Restored packages/babel-plugin-transform-react-jsx/test/fixtures/react/honor-custom-jsx-pragma-option/
* Allow nightly Yarn builds to be used
Fixes:
```
C:\src\babel (fix-it-fix-it-fix-it-fix-it) (babel)
λ yarn
yarn install v1.0.0-20170811.1240
[1/5] Validating package.json...
error babel@: The engine "yarn" is incompatible with this module. Expected version ">=0.27.5".
error Found incompatible module
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
```
* Use Yarn 0.28.4 to fix build
This change has two reasons:
- The object was actually used as a map
- Using an object leads some problems with the
private_class_fields/constructor.js test, since
`tests[test_name] || {}` returned the Obejct
constructor instead of an empty object.
So, I was reading the new Flow type strictness and noticed
https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/
Specifically, I wondered whether the `sum_all` example would copy the
arguments into an array, then loop over. Sadly, it does.
```js
function sum_all(...rest) {
let ret = 0;
for (let i = 0; i < rest.length; i++) { ret += rest[i]; }
return ret;
}
// output
function sum_all() {
var ret = 0;
for (var _len = arguments.length, rest = Array(_len), _key = 0; _key < _len; _key++) {
rest[_key] = arguments[_key];
}
for (var i = 0; i < rest.length; i++) { ret += rest[i]; }
return ret;
}
```
But then I noticed if I changed `let i = 0` to `let i: number = 0`, it
worked directly on `arguments`. That lead me down a rabbit hole to
`Path#_guessExecutionStatusRelativeTo`. When tracing through, the last
comparison made no sense to me. It was trying to find the index of
`"init"` in a list of `["declarations"]` and `"body"` in `["directives",
"body"]`. Red flags and such.
But it makes sense when you're trying to compare the visitor order of
the common ancestor path. Then we're trying to find `"init"` in a list
of `["init", "test", "update", "body"]`. Oh, and there's `"body"` in
there too! And now we know the `ForStatement`'s `init` is executed
before the `body`.
Arrow functions can't be entrly skipped while traversing because this
references inside of them needs to be transformed, so I added a check
which prevents return statements inside arrow functions from being
saved for the transformation.
Fixes#5817 (regression)
