add support to tslint.json linterOptions.exclude

[devpaul]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier
• Unit or Functional tests are included in the PR
• schema.json has been updated appopriately

Description:

This adds support to dojo's tslint-loader configuration to support tslint's linterOptions.exclude.

It turns out that tslint-loader doesn't support this (wbuchwalter/tslint-loader#104). So to implement this we're using webpack's exclude option to explicitly avoid linting files in the tslint.json exclude and using globby to generate a list of absolute paths to files to exclude.

Resolves #85

[codecov]

Codecov Report

Merging #377 into master will increase coverage by 0.29%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #377      +/-   ##
==========================================
+ Coverage   48.92%   49.21%   +0.29%     
==========================================
  Files          10       10              
  Lines         695      703       +8     
  Branches      199      205       +6     
==========================================
+ Hits          340      346       +6     
- Misses        355      357       +2

Impacted Files	Coverage Δ
src/base.config.ts	20.85% <66.66%> (+1.2%)	⬆️
src/main.ts	89.18% <0%> (+0.11%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dd7d1b4...9cbc7cb. Read the comment docs.

[agubler]

I find this a little hard to parse, perhaps we can make it clearer using an if block?

let tsLintExcludeFiles = [];
if (tsLint && tsLint.linterOptions && tsLint.linterOptions.excludes) {
    const { linterOptions: { exclude } } = tsLint;
    tsLintExcludeFiles = globby.sync(exclude).map((file) => path.resolve(file)));
}