This is a javascript function that lets you indent your template strings relative to your code. It removes any extra indentation from the final string. This is specially important for LLM prompts.

dedent.js

// Source: https://github.com/sveltejs/kit/blob/environment-api/packages/kit/src/core/sync/utils.js
/**
 * Allows indenting template strings without the extra indentation ending up in the result.
 * Still allows indentation of lines relative to one another in the template string.
 * @param {TemplateStringsArray} strings
 * @param {any[]} values
 */
export function dedent(strings, ...values) {
	let dedented = dedent_map.get(strings);

	if (!dedented) {
		const indentation = /** @type {RegExpExecArray} */ (/\n?([ \t]*)/.exec(strings[0]))[1];
		const pattern = new RegExp(`^${indentation}`, 'gm');

		dedented = {
			strings: strings.map((str) => str.replace(pattern, '')),
			indents: []
		};

		let current = '\n';

		for (let i = 0; i < values.length; i += 1) {
			const string = dedented.strings[i];
			const match = /\n([ \t]*)$/.exec(string);

			if (match) current = match[0];
			dedented.indents[i] = current;
		}

		dedent_map.set(strings, dedented);
	}

	let str = dedented.strings[0];
	for (let i = 0; i < values.length; i += 1) {
		str += String(values[i]).replace(/\n/g, dedented.indents[i]) + dedented.strings[i + 1];
	}

	str = str.trim();

	return str;
}

/* example
```javascript
case sveltekit_server: {
  return dedent`
    export let read_implementation = null;

    export let manifest = null;

    export function set_read_implementation(fn) {
      read_implementation = fn;
    }

    export function set_manifest(_) {
      manifest = _;
    }
  `;
} 
```

will indent to:

```javascript
export let read_implementation = null;

export let manifest = null;

export function set_read_implementation(fn) {
  read_implementation = fn;
}

export function set_manifest(_) {
  manifest = _;
}
```

this is specially useful for not over-indenting llm prompts and keeps your codes nice and readable
https://dev.to/darkmavis1980/template-literals-why-indentation-matters-especially-for-ai-prompts-3jl4

without dedent the string would keep the total indentation set by the code, like this:

```javascript
    export let read_implementation = null;

    export let manifest = null;

    export function set_read_implementation(fn) {
      read_implementation = fn;
    }

    export function set_manifest(_) {
      manifest = _;
    }
```
*/