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export class EtaError extends Error {  constructor(message: string) {    super(message);    this.name = "Eta Error";  }}
export class EtaParseError extends EtaError {  constructor(message: string) {    super(message);    this.name = "EtaParser Error";  }}
export class EtaRuntimeError extends EtaError {  constructor(message: string) {    super(message);    this.name = "EtaRuntime Error";  }}
export class EtaFileResolutionError extends EtaError {  constructor(message: string) {    super(message);    this.name = "EtaFileResolution Error";  }}
export class EtaNameResolutionError extends EtaError {  constructor(message: string) {    super(message);    this.name = "EtaNameResolution Error";  }}
/** * Throws an EtaError with a nicely formatted error and message showing where in the template the error occurred. */
export function ParseErr(message: string, str: string, indx: number): never {  const whitespace = str.slice(0, indx).split(/\n/);
  const lineNo = whitespace.length;  const colNo = whitespace[lineNo - 1].length + 1;  message +=    " at line " +    lineNo +    " col " +    colNo +    ":\n\n" +    "  " +    str.split(/\n/)[lineNo - 1] +    "\n" +    "  " +    Array(colNo).join(" ") +    "^";  throw new EtaParseError(message);}
export function RuntimeErr(originalError: Error, str: string, lineNo: number, path: string): never {  // code gratefully taken from https://github.com/mde/ejs and adapted
  const lines = str.split("\n");  const start = Math.max(lineNo - 3, 0);  const end = Math.min(lines.length, lineNo + 3);  const filename = path;  // Error context  const context = lines    .slice(start, end)    .map(function (line, i) {      const curr = i + start + 1;      return (curr == lineNo ? " >> " : "    ") + curr + "| " + line;    })    .join("\n");
  const header = filename ? filename + ":" + lineNo + "\n" : "line " + lineNo + "\n";
  const err = new EtaRuntimeError(header + context + "\n\n" + originalError.message);
  err.name = originalError.name; // the original name (e.g. ReferenceError) may be useful
  throw err;}