Function calculateOffsetOnce

packages/vite/src/node/ssr/ssrStacktrace.ts:7–23

()

let offset: number

function calculateOffsetOnce() {
  if (offset !== undefined) {
    return
  }

  try {
    // `"use strict";` mirrors the directive prepended on its own line by
    // `ESModulesEvaluator`
    new Function('"use strict";\nthrow new Error(1)')()
  } catch (e) {
    // in Node 12, stack traces account for the function wrapper.
    // in Node 13 and later, the function wrapper adds two lines,
    // which must be subtracted to generate a valid mapping
    const match = /:(\d+):\d+\)$/.exec(e.stack.split('\n')[1])
    offset = match ? +match[1] - 1 : 0
  }
}

export function ssrRewriteStacktrace(
  stack: string,