Also check non-test files in isolation

[jablko]

Somewhat related to microsoft/types-publisher#708, the inclusion of test files in tsconfig.json means that dtslint might miss a library that errors on import, if a test file contains a /// <reference types="..." /> that the library errors without.

DefinitelyTyped/DefinitelyTyped#44178 corrects some examples of this.

The test files aren't normally part of users' builds, when users consume the declarations (the test files aren't even distributed in DefinitelyTyped @types packages). This change is an attempt to confirm that, as well as the tests passing, the declarations are importable by themselves.

The fileNames.filter(fileName => fileName.endsWith(".d.ts") logic, to exclude the test files from the source files, comes from https://github.com/microsoft/types-publisher/blob/dd69e3b816be1600d7bec25919c4fe07826573c8/src/lib/module-info.ts#L165-L169

I confirmed that this change does catch at least each of the cases addressed in DefinitelyTyped/DefinitelyTyped#44178, e.g.

$ node ../dtslint/bin/index.js types jsforce
Error: api/chatter.d.ts(3,24): error TS2307: Cannot find module 'stream' or its 
corresponding type declarations.                                                
api/metadata.d.ts(3,24): error TS2307: Cannot find module 'stream' or its corres
ponding type declarations.                                                      
api/metadata.d.ts(4,24): error TS2307: Cannot find module 'buffer' or its corres
ponding type declarations.                                                      
batch.d.ts(1,34): error TS2307: Cannot find module 'stream' or its corresponding
 type declarations.                                                             
bulk.d.ts(1,24): error TS2307: Cannot find module 'stream' or its corresponding 
type declarations.                                                              
query.d.ts(2,26): error TS2307: Cannot find module 'stream' or its corresponding
 type declarations.                                                             
record.d.ts(1,24): error TS2307: Cannot find module 'stream' or its correspondin
g type declarations.                                                            
salesforce-object.d.ts(1,25): error TS2307: Cannot find module 'stream' or its c
orresponding type declarations.                                                 

[sandersn]

One question about the PRs that need to be fixed before this ships: you ended up closing most of them. Why?

[jablko]

One question about the PRs that need to be fixed before this ships: you ended up closing most of them. Why?

Sorry, those were a mistake. I think all of the PRs that need to be merged before this one now have been.