TS2339 error mismatch between tss and tsc

[dvogel]

Given this file:

['a', 'b', 'c'].find(function(letter, idx, ary){
  return letter == 'c';
});

I can run it through tsc 1.5.0-beta without any errors.

However, when using typescript-tools sha 619d879 I see an error when I run the file through tss:

echo showErrors | tss array_of_string_find_method.ts | jq '.'
"loaded /tmp/array_of_string_find_method.ts, TSS listening.."
[
  {
    "file": "/tmp/array_of_string_find_method.ts",
    "start": {
      "line": 1,
      "character": 17
    },
    "end": {
      "line": 1,
      "character": 21
    },
    "text": "Property 'find' does not exist on type 'string[]'.",
    "code": 2339,
    "phase": "Semantics",
    "category": "Error"
  }
]

[clausreinke]

I can run it through tsc 1.5.0-beta without any errors.

I doubt that!-) tsc tends to generate code even in the presence of non-fatal errors, but it does emit the error you mentioned. find is an ES6/2015 method, and tsc/tss default to target ES5, so there has to be an error. Adding --target es6 eliminates the error in both cases.

[dvogel]

My mistake. I didn't realize that adding filenames to the tss command line overrode the default behavior of loading the tsconfig.json file. I used the --target ES6 parameter on the command line when testing tsc. At that point I had not yet read this on the typescript wiki:

When input files are specified on the command line, tsconfig.json files are ignored.

Thanks for your explanation.