Convert to strict mode (through test/unit/specs).

[NodeGuy]

Convert all files below (and any new ones in the relevant directories) to strict mode by adding "use strict" as the first line and correct any strict mode violations that occur as a result.

archive/components/CardBalance.spec.js
archive/components/CardNew.spec.js
archive/components/NiCards.spec.js
archive/components/NiTag.spec.js
archive/components/ToggleBtn.spec.js
jest.config.js
tasks/build/local/build.js
tasks/common.js
tasks/test-build.js
tasks/testnet.js
tasks/windows-installer.js
test/e2e/common.js
test/e2e/init.js
test/e2e/preferences.js
test/e2e/signin.js
test/e2e/staking.js
test/e2e/wallet.js
test/unit/coverage/lcov-report/block-navigation.js
test/unit/coverage/lcov-report/prettify.js
test/unit/coverage/lcov-report/sorter.js
test/unit/helpers/console_error_throw.js
test/unit/helpers/electron_mock.js
test/unit/helpers/fixed_time.js
test/unit/helpers/fs-mock.js
test/unit/helpers/genesis_mock.js
test/unit/helpers/node_mock.js
test/unit/helpers/vuex-helpers.js
test/unit/helpers/vuex-setup.js
test/unit/specs/App.spec.js
test/unit/specs/addressbook.spec.js
test/unit/specs/build.spec.js

[jbibla]

@NodeGuy is there a reason you added the design label?

[NodeGuy]

No, I must have fat-fingered it.

https://www.youtube.com/watch?v=OqjF7HKSaaI

[jbibla]

wonderful reference, thank you.