Is your feature request related to a problem? Please describe.

i am author of npm-package istanbul-lite.
when creating coverage-reports and artifacts,
its common to lazily write data to file-directories that have yet to be created.

Describe the solution you'd like

add extra boolean <options>.mkdirp to functions fs.writeFile and fs.writeFileSync,
that will lazily create missing file-directories when writing to file.
the common-use-case are:

• lazily generate directories when writing coverage-report of instrumented files
• lazily generate directories when writing artifacts in ci and testing
• lazily generate directories when scaffolding new web-projects

Describe alternatives you've considered

i currently use this helper-function in all my projects,
to lazily generate directories when writing artifacts and coverage-reports.

    function fsWriteFileWithMkdirpSync (file, data) {
    /*
     * this function will sync write <data> to <file> with "mkdir -p"
     */
        let fs;
        // do nothing if module does not exist
        try {
            fs = require("fs");
        } catch (ignore) {
            return;
        }
        // try to write file
        try {
            fs.writeFileSync(file, data);
            return true;
        } catch (ignore) {
            // mkdir -p
            fs.mkdirSync(require("path").dirname(file), {
                recursive: true
            });
            // rewrite file
            fs.writeFileSync(file, data);
            return true;
        }
    };