Bash and JS script allowing to start Node with defined options (i.e. harmony) and custom command and properties.

node.js

#!/usr/bin/env node.sh

// Published under the MIT License - https://opensource.org/licenses/MIT

// Installation:
// 1 - Copy both node.sh and node.js in a directory included in your system PATH
// 2 - Ensure that both scripts are executable (chmod +x node.js node.sh)
// Usage:
// 1 - Invoke node.js in a terminal to start the shell
// 2 - Type .help to list the REPL commands available
// 3 - To quit the shell, at the prompt, type .quit or .exit

let repl = require("repl");
let replServer = repl.start({ prompt: `Node:${process.version}> `});
let context = replServer.context;

// Configure what’s available in the REPL
context.util = require("util");

// Define a quit command (same as default exit command)
replServer.defineCommand('quit', {
    help: 'Quit the repl (same as .exit)',
    action: function() {
        this.clearBufferedCommand();
        console.log(`Bye!`);
        this.close();
    }
});

// Define custom functions (print...)
let customFunctions = (ctx) => {
    ctx.print = console.log;
}

customFunctions(context);

// Define a command .reset that behaves like .clear, but redefines functions
// initially defined for the repl server, like print.
replServer.defineCommand('reset', {
    help: 'Clear local context but preserve custom properties and functions like "print"',
    action: function() {
        this.clearBufferedCommand();
        if (!this.useGlobal) {
            this.outputStream.write('Clearing context...\n');
            this.resetContext();
            customFunctions(this.context);
        }
        this.displayPrompt();
    }
});

node.sh

#!/usr/bin/env bash

# Published under the MIT License - https://opensource.org/licenses/MIT

# Remove or comment the option --http-parser if it is not available in your version of Node
# - Node 12: 'lhttp' is the default but you can reverse to 'legacy'
# - Node 11: 'legacy' is the default but you can select 'lhttp'
# - Node 10: there is no option to change the http parser (default is 'legacy')

# Enable all harmony features that are set to false by default
OPTIONS=$(node --v8-options \
| grep -A1 "\-\-harmony" \
| awk '/^  --harmony/ { l = $1; getline; printf "%s %s\n", l, $4}' \
| grep false \
| cut -d ' ' -f 1)

node $OPTIONS \
     --experimental-repl-await \
     --experimental-worker \
     --pending-deprecation \
     --trace-deprecation \
     --trace-warnings \
     --http-parser=llhttp \
     --title="AB Node JS" \
     $*