nodejsscriptrc.md

nodejsscriptrc.mjs

You can define nodejsscriptrc.mjs file in your config location. That corresponds to $.xdg.config("nodejsscript") folder. In linux the full location should be ~/.config/nodejsscript/nodejsscriptrc.mjs.

Use nodejsscript --help to find out the location of the nodejsscriptrc.mjs file.

Ideas

This script corresponds to what the .bashrc if for bash. It is imported before requested script.

Fallback

In vresion ≥1 you can for example fallback:

/* deprecated/fallback */
globalThis.cyclicLoop= function*(items){
	if(!items) items= 'win32'===process.platform ? '|/-\\' : "⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏";
	const { length }= items;
	for(let i=0; true; i++){
		if(i===length) i= 0;
		yield items[i];
	}
}

Aliases

For shorter --eval/--print:

globalThis.my= {
	get nosed(){ return this.stdin.text(""); },
	get nojq(){ return this.stdin.json(null); },
	get noawk(){ return this.stdin.lines([]); },
};

So, than you can:

# instead of
echo '{"a":"A"}' | nodejsscript --print '$.stdin.json().a'
# you can also use
echo '{"a":"A"}' | njs -p 'my.nojq.a'

# instead of
who | nodejsscript --print '$.stdin.text().split(/ +/)[0]'
# you can also use
who | njs -p 'my.nosed.split(/ +/)[0]'

# instead of
apt list --installed | nodejsscript --print '$.stdin.lines().filter(l=> l.indexOf("libreoffice")!==-1).length'
# you can also use
apt list --installed | njs -p 'my.noawk.filter(l=> l.indexOf("libreoffice")!==-1).length'

Note: in case you used pre-v1.0.0 non-promoted API methods ($.nojq, …), use these aliases instead:

Reflect.defineProperty($, "nosed", { get(){ return this.stdin.text(""); }, });
Reflect.defineProperty($, "nojq", { get(){ return this.stdin.json(null); }, });
Reflect.defineProperty($, "noawk", { get(){ return this.stdin.lines([]); }, });

Custom error handler/printer

You can define your own error handler which can print the error message into the console.

/** Custom uncaughtException function */
export function uncaughtException(e){
	echo("There was an error:", e);
};

Targets

You can specify in which kind of nodejsscript invocation you want to use your definitions:

//nodejsscriptrc.mjs
// … my code evaluated for each nodejsscript invocation

/** Place for custom code when script starts */
export function onscript(){}
/** Place for custom code when REPL starts (`--interactive`) */
export function onrepl(){}
/** Place for custom code when eval starts (`--eval`/`--print`) */
export function oneval(){}

Processing (modifications)

You can use norc in environmental variable NODEJSSCRIPTOPTS, for example:

export NODEJSSCRIPTOPTS=norc
# …
NODEJSSCRIPTOPTS=norc njs --eval 'console.log("Hello World!")'

The nodejsscriptrc.mjs is not processed when called locally (npx nodejsscript…).