When project hasn't any ts-file, throw error

[arvitaly]

Bug Report

My project has one d.t.s file and tslint throw error.

• TSLint version: 4.0.2
• TypeScript version: 2.1.4
• Running TSLint via: CLI

TypeScript code being linted

with tslint.json configuration:

{
    "extends": [
        "tslint:latest"
    ]
}

Actual behavior

TypeError: Reduce of empty array with no initial value in \node_modules\tslint\lib\tslint-cli.js:224:6

Expected behavior

No error.

[IllusionMH]

@arvitaly I think there is easy fix, but unfortunately I can't reproduce your case.
Can you provide your file structure and exact command on how you call tslint? Do you use --project flag?

[arvitaly]

@IllusionMH Hi!

[IllusionMH]

@arvitaly thanks. This screenshots confirms my thoughts.
Looks like I reproduced case similar to yours and error will be fixed after merge of #1933.

TSLint is supposed to lint .ts, .tsx, .js and .jsx files.
.d.ts are skipped (see linter.ts:88)

To make TSLint properly check files your tsconfig.json should have files or include section or/and you can pass globs for .ts files (along with --project flag) in command line.

[arvitaly]

@IllusionMH, thanks!

[arvitaly]

I faced with this situation, when i developed types for https://github.com/DefinitelyTyped/DefinitelyTyped.
These projects haven't ts-file usually, only d.ts.