Remove using Webpack import syntax such as: `js-yaml-loader!@/..`. It's
a non-standard syntax that couples the code to Webpack.
Configure instead by specifying Webpack loader in Vue configuration
file.
Enable related ESLint rules.
Remove unused dependency `raw-loader` and refactor
`NoUnintendedInlining` test to load files using file system (dropping
webpack dependency).
Refactor to use `import type` for type imports to show the indent
clearly and satisfy failing ESLint rules.
- Unify test data for nonexistence of an object/string and collection.
- Introduce more test through adding missing test data to existing tests.
- Improve logic for checking absence of values to match tests.
- Add missing tests for absent value validation.
- Update documentation to include shared test functionality.
