Update typescript & types

[G-Rath]

Latest TypeScript is more accurate, faster, and mathematically higher 🥳

I also updated @types/rimraf, and @types/sinon: while this is bumping majors, it's raising them to match the current version of the package in use, as @types packages match the major.minor version of the package their typing (i.e so @types/sinon@9 should be used for sinon@9, while @types/sinon@7 should be used for sinon@7)

This revealed that the this.timeout = assignment being done in a test was invalid (since arrow functions don't have access to the mocha context); it's actually not needed because the timeout is set higher than 3500 via the launching flag.

[G-Rath]

@patrickhulce I've opened up two minor PRs for now, because I don't want to tornado through your project tearing things up and stepping on toes but I'm keen to go further if you'd like (and if that works for the GoogleChrome org?), namely by enabling strict mode.

I did also notice that the type-check command is currently only checking js files, and doesn't use the same settings as your tsconfig - I'm happy to tweak that as well if you'd like 🙂

[paulirish]

published in 0.13.3