Typed arguments

[dhleong]

See oclif/oclif#301

Instead of doing args as const we can do name: "name" as const to ensure the name is kept; if that's omitted then you still get a map type for the args property. Non-string arg types can be inferred from the results of parser functions or default values.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @dhleong to sign the Salesforce.com Contributor License Agreement.

[codecov]

Codecov Report

Merging #66 into master will decrease coverage by 91.38%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #66       +/-   ##
==========================================
- Coverage   91.38%   0.00%   -91.39%     
==========================================
  Files          11       1       -10     
  Lines         325      29      -296     
  Branches       86      14       -72     
==========================================
- Hits          297       0      -297     
- Misses         12      29       +17     
+ Partials       16       0       -16     

Impacted Files	Coverage Δ
src/validate.ts	0.00% <0.00%> (-96.88%)	⬇️
src/util.ts
src/screen.ts
src/deps.ts
src/help.ts
src/flags.ts
src/list.ts

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