Lint/check ignores local prettier.config.js config

This leads to inconsistencies between with gts fix, for example:

$ cat prettier.config.js 
module.exports = {
  singleQuote: true,
  trailingComma: 'all',
};

$ node_modules/.bin/gts fix file.ts
Warning: The 'deprecation' rule requires type information.
Done in 2.06s.

$ node_modules/.bin/gts check file.ts
file.ts
Unnecessary trailing comma (trailing-comma)
  44 |     input: string,
  45 |     replacement: string,
> 46 |     count: number,
     |                                   ^
  47 |   ): string {
  48 |     if (replacement == null) return input;

[ofrobots]

Here’s another test I created that verifies the trailing comma option works as well:

  it('format should use user provided prettier.config.js 2', () => {
    return withFixtures({
      'tsconfig.json': JSON.stringify({ files: ['far.ts'] }),
      'prettier.config.js': `module.exports = {
  singleQuote: true,
  trailingComma: 'all',
};`,
      'far.ts': `export function far(
  ceiling: string,
  vines: string,
  sailed: number,
  ocean: number,
  tumbled: string,
): string {
  return 'where the wild things are';
}
`,
    }, async () => {
      const result = await format.format(OPTIONS, [], false);
      assert.strictEqual(result, true);
    });
  });

It seems to pass. A reproducing test repo / gist would be needed to investigate this further.

[ofrobots]

The solutions seems to be using something like tslint-config-prettier. It removes conflicting style rules from the tslint config.