ryangoree · May 23, 2024 17:31
diff --git a/getCallerPath.ts b/getCallerPath.ts
 /**
 * Attempts to get the path to the file that called the function that called
 * this function.
 * @example
 *
 * #### Caller:
 * ```ts
 * // /path/to/file.ts
 * import { foo } from './path/to/foo.ts';
 *
 * foo();
 * ```
 *
 * #### Callee:
 *
 * ```ts
 * // /path/to/foo.ts
 * import { getCallerPath } from 'src/utils/get-caller';
 *
 * export function foo() {
 *  console.log(getCallerPath()); // /path/to/file.ts
 * }
 * ```
 */
 export function getCallerPath(): string | undefined {
  /**
   * 0 = error name and message
   *
   * 1 = path to this file
   *
   * 2 = path to the file that called this function. The one that wants to know
   *     it's caller.
   *
   * 3 = path to the file that called the function that called this function
   *     (this is the file that the caller of this function wants)
   */
  const callerIndex = 3;
  const err = new Error();

  // Attempt to overwrite the `prepareStackTrace` function. This will work in
  // v8 environments, but will be ignored otherwise.
  // https://v8.dev/docs/stack-trace-api#customizing-stack-traces
  const originalPrepareStackTrace = Error.prepareStackTrace;
  Error.prepareStackTrace = (_, stack) => stack;
  Error.captureStackTrace(err);
  Error.prepareStackTrace = originalPrepareStackTrace;

  if (!err.stack) return undefined;

  // If the stack is an array, we're in a v8 environment and can use the
  // `getFileName` method on the call site.
  if (Array.isArray(err.stack)) {
    const caller = err.stack[callerIndex] as NodeJS.CallSite;
    return caller?.getFileName();
  }

  // If the stack is a string, we're in a non-v8 environment and need to parse
  // the stack string to get the file path.
  // https://regex101.com/r/yyMI5W/1
  const callerLine = err.stack.split('\n')[callerIndex].trim();
  const callerFile = callerLine.match(/(file|\/)[^\s]+?(?=(:\d|\)))/)?.[0];

  if (!callerFile) return undefined;

  return new URL(callerFile, import.meta.url).pathname;
 }
	/**
	* Attempts to get the path to the file that called the function that called
	* this function.
	* @example
	*
	* #### Caller:
	* ```ts
	* // /path/to/file.ts
	* import { foo } from './path/to/foo.ts';
	*
	* foo();
	* ```
	*
	* #### Callee:
	*
	* ```ts
	* // /path/to/foo.ts
	* import { getCallerPath } from 'src/utils/get-caller';
	*
	* export function foo() {
	* console.log(getCallerPath()); // /path/to/file.ts
	* }
	* ```
	*/
	export function getCallerPath(): string \| undefined {
	/**
	* 0 = error name and message
	*
	* 1 = path to this file
	*
	* 2 = path to the file that called this function. The one that wants to know
	* it's caller.
	*
	* 3 = path to the file that called the function that called this function
	* (this is the file that the caller of this function wants)
	*/
	const callerIndex = 3;
	const err = new Error();

	// Attempt to overwrite the `prepareStackTrace` function. This will work in
	// v8 environments, but will be ignored otherwise.
	// https://v8.dev/docs/stack-trace-api#customizing-stack-traces
	const originalPrepareStackTrace = Error.prepareStackTrace;
	Error.prepareStackTrace = (_, stack) => stack;
	Error.captureStackTrace(err);
	Error.prepareStackTrace = originalPrepareStackTrace;

	if (!err.stack) return undefined;

	// If the stack is an array, we're in a v8 environment and can use the
	// `getFileName` method on the call site.
	if (Array.isArray(err.stack)) {
	const caller = err.stack[callerIndex] as NodeJS.CallSite;
	return caller?.getFileName();
	}

	// If the stack is a string, we're in a non-v8 environment and need to parse
	// the stack string to get the file path.
	// https://regex101.com/r/yyMI5W/1
	const callerLine = err.stack.split('\n')[callerIndex].trim();
	const callerFile = callerLine.match(/(file\|\/)[^\s]+?(?=(:\d\|\)))/)?.[0];

	if (!callerFile) return undefined;

	return new URL(callerFile, import.meta.url).pathname;
	}