I enabled vscode autocomplete in our test files. Typechecking had too many errors to enable, but it caught some real bugs that I will fix in a follow up.
This patch contains:
* `test/types.d.ts` - d.ts file for our test runner.
* `test/tsconfig.json` - typescript project for our tests.
* JSDoc header in all specs to mark the describe as a TestSuite
* Drive-by fix of a launcher test that was using `if` instead of `it`
* Some drive-by fixes of unimpactful typos in tests.
This starts treating the following selectors as xpath:
- `page.$('//div')`
- `page.$('(//div)[1]')`
- `page.$('((((//div))))[1]')`
(and generally, any number of leading openting parenthesis)
Fixes#817
- Selector is again a string.
- Most methods taking selector also accept waitFor option.
- Available waitFor options are: 'visible', 'hidden', 'any' === true, false === undefined.
- waitForXPath is removed.
- waitForSelector is replaced by $(selector, { waitFor: true }).
