Function cleanErrorStack

packages/effect/src/internal/effect.ts:407–422

(
  stack: string,
  error: Error,
  annotations: ReadonlyMap<string, unknown> | undefined
)

const locationRegExp = /\((.*)\)/g

const cleanErrorStack = (
  stack: string,
  error: Error,
  annotations: ReadonlyMap<string, unknown> | undefined
): string => {
  const message = `${error.name}: ${error.message}`
  const lines = (stack.startsWith(message) ? stack.slice(message.length) : stack).split("\n")
  const out: Array<string> = [message]
  for (let i = 1; i < lines.length; i++) {
    if (/(?:Generator\.next|~effect\/Effect)/.test(lines[i])) {
      break
    }
    out.push(lines[i])
  }
  return annotations ? addStackAnnotations(out.join("\n"), annotations) : out.join("\n")
}

const addStackAnnotations = (stack: string, annotations: ReadonlyMap<string, unknown>) => {
  const frame = annotations?.get(CauseStackTrace.key) as StackFrame | undefined