Why not export a sync parse method?

[aak1247]

Since parse might be used in some pipeline operation, not all these pipelines are promise-friendly.

And this method could have been sync:

public async parseFiles(
        filePathes: string[],
        rootPath: string): Promise<File[]> {
        return filePathes
            .map((o) => {
                let scriptKind: ScriptKind = ScriptKind.Unknown;
                const parsed = parse(o);
                switch (parsed.ext.toLowerCase()) {
                    case 'js':
                        scriptKind = ScriptKind.JS;
                        break;
                    case 'jsx':
                        scriptKind = ScriptKind.JSX;
                        break;
                    case 'ts':
                        scriptKind = ScriptKind.TS;
                        break;
                    case 'tsx':
                        scriptKind = ScriptKind.TSX;
                        break;
                }
                return createSourceFile(
                    o,
                    readFileSync(o).toString(),
                    ScriptTarget.ES2015,
                    true,
                    scriptKind,
                );
            })
            .map(o => this.parseTypescript(o, rootPath));
    }