mocha w/ yargs help output (new.txt) vs old output (old.txt)

new.txt

mocha [spec..]

Run tests with Mocha

Commands:
  mocha [spec..]     Run tests with Mocha                              [default]
  mocha init <path>  create a client-side Mocha setup at <path>

Rules & Behavior
  --allow-uncaught  Allow uncaught errors to propagate                 [boolean]
  --async-only, -A  Require all tests to use a callback (async) or return a
                    Promise                                            [boolean]
  --check-leaks     Check for global variable leaks                    [boolean]
  --forbid-only     Fail if exclusive test(s) encountered              [boolean]
  --forbid-pending  Fail if pending test(s) encountered                [boolean]
  --no-timeouts     Disable timeouts                                   [boolean]
  --bail, -b        Abort ("bail") after first test failure            [boolean]
  --delay           Delay initial execution of root suite              [boolean]
  --exit            Force Mocha to quit after tests complete           [boolean]
  --globals         Comma-separated list of allowed global variables    [string]
  --retries         Retry failed tests this many times     [number] [default: 0]
  --slow, -s        Specify "slow" test threshold (in milliseconds)
                                                          [number] [default: 75]
  --timeout, -t     Specify test timeout threshold (in milliseconds)
                                                                 [default: 2000]
  --ui, -u          Specify user interface             [string] [default: "bdd"]

Reporting & Output
  --full-trace            Display full stack traces                    [boolean]
  --inline-diffs          Display actual/expected differences inline within each
                          string                                       [boolean]
  --no-colors, -C         Disable color output                         [boolean]
  --reporter-options, -O  Reporter-specific options (<k=v,[k1=v1,..]>)  [string]
  --colors, -c            Force-enable color output                    [boolean]
  --diff                  Show diff on failure         [boolean] [default: true]
  --growl, -G             Enable Growl notifications                   [boolean]
  --reporter, -R          Specify reporter to use     [string] [default: "spec"]

File Handling
  --watch-extensions  Comma-separated list of extensions to monitor with
                      "--watch"                         [string] [default: "js"]
  --compilers         Use the given module(s) to compile files
                      (<ext:module,[ext1:module1]>)                     [string]
  --exclude           Ignore file(s) or glob pattern(s)[array] [default: (none)]
  --file              Specify file(s) to be loaded prior to root suite execution
                                                       [array] [default: (none)]
  --recursive         Look for tests in subdirectories                 [boolean]
  --require, -r       Require module                   [array] [default: (none)]
  --sort, -S          Sort test files                                  [boolean]
  --watch, -w         Watch files in the current working directory for changes
                                                                       [boolean]

Config Files
  --config  Load config file                        [default: (nearest rc file)]
  --opts    Path to `mocha.opts`         [string] [default: "./test/mocha.opts"]

Test Filters
  --fgrep, -f   Only run tests containing this string                   [string]
  --grep, -g    Only run tests matching this string or regexp           [string]
  --invert, -i  Inverts --grep and --fgrep matches                     [boolean]

Positional Arguments
  spec  One or more files, directories, or globs to test    [default: ["test/"]]

Other Options
  --help, -h           Show help                                       [boolean]
  --version            Show version number                             [boolean]
  --show-node-options  Show supported Node.js & V8 options; use with "--help"
                                                                       [boolean]
  --interfaces         List built-in user interfaces & exit            [boolean]
  --reporters          List built-in reporters & exit                  [boolean]

Read the docs at https://mochajs.org

old.txt

  Usage: mocha [debug] [options] [files]

  Options:

    -V, --version                           output the version number
    -A, --async-only                        force all tests to take a callback (async) or return a promise
    -c, --colors                            force enabling of colors
    -C, --no-colors                         force disabling of colors
    -G, --growl                             enable growl notification support
    -O, --reporter-options <k=v,k2=v2,...>  reporter-specific options
    -R, --reporter <name>                   specify the reporter to use (default: spec)
    -S, --sort                              sort test files
    -b, --bail                              bail after first test failure
    -d, --debug                             enable node's debugger, synonym for node --debug
    -g, --grep <pattern>                    only run tests matching <pattern>
    -f, --fgrep <string>                    only run tests containing <string>
    -gc, --expose-gc                        expose gc extension
    -i, --invert                            inverts --grep and --fgrep matches
    -r, --require <name>                    require the given module
    -s, --slow <ms>                         "slow" test threshold in milliseconds [75]
    -t, --timeout <ms>                      set test-case timeout in milliseconds [2000]
    -u, --ui <name>                         specify user-interface (bdd|tdd|qunit|exports) (default: bdd)
    -w, --watch                             watch files for changes
    --check-leaks                           check for global variable leaks
    --full-trace                            display the full stack trace
    --compilers <ext>:<module>,...          use the given module(s) to compile files (default: )
    --debug-brk                             enable node's debugger breaking on the first line
    --globals <names>                       allow the given comma-delimited global [names] (default: )
    --es_staging                            enable all staged features
    --harmony<_classes,_generators,...>     all node --harmony* flags are available
    --preserve-symlinks                     Instructs the module loader to preserve symbolic links when resolving and caching modules
    --icu-data-dir                          include ICU data
    --inline-diffs                          display actual/expected differences inline within each string
    --no-diff                               do not show a diff on failure
    --inspect                               activate devtools in chrome
    --inspect-brk                           activate devtools in chrome and break on the first line
    --interfaces                            display available interfaces
    --no-deprecation                        silence deprecation warnings
    --exit                                  force shutdown of the event loop after test run: mocha will call process.exit
    --no-timeouts                           disables timeouts, given implicitly with --debug
    --no-warnings                           silence all node process warnings
    --opts <path>                           specify opts path (default: test/mocha.opts)
    --perf-basic-prof                       enable perf linux profiler (basic support)
    --napi-modules                          enable experimental NAPI modules
    --prof                                  log statistical profiling information
    --log-timer-events                      Time events including external callbacks
    --recursive                             include sub directories
    --reporters                             display available reporters
    --retries <times>                       set numbers of time to retry a failed test case
    --throw-deprecation                     throw an exception anytime a deprecated function is used
    --trace                                 trace function calls
    --trace-deprecation                     show stack traces on deprecations
    --trace-warnings                        show stack traces on node process warnings
    --use_strict                            enforce strict mode
    --watch-extensions <ext>,...            additional extensions to monitor with --watch (default: js)
    --delay                                 wait for async suite definition
    --allow-uncaught                        enable uncaught errors to propagate
    --forbid-only                           causes test marked with only to fail the suite
    --forbid-pending                        causes pending tests and test marked with skip to fail the suite
    --file <file>                           include a file to be ran during the suite (default: )
    --exclude <file>                        a file or glob pattern to ignore (default: )
    -h, --help                              output usage information

  Commands:

    init <path>                             initialize a client-side mocha setup at <path>