msw/src/core/utils/internal/getCallFrame.ts

Seamless REST/GraphQL API mocking library for browser and Node.js.

// Ignore the source files traces for local testing.
const SOURCE_FRAME = /[\/\\]msw[\/\\]src[\/\\](.+)/

const BUILD_FRAME =
  /(node_modules)?[\/\\]lib[\/\\](core|browser|node|native|iife)[\/\\]|^[^\/\\]*$/

/**
 * Return the stack trace frame of a function's invocation.
 */
export function getCallFrame(error: Error) {
  // In <IE11, new Error may return an undefined stack
  const stack = error.stack

  if (!stack) {
    return
  }

  const frames: string[] = stack.split('\n').slice(1)

  // Get the first frame that doesn't reference the library's internal trace.
  // Assume that frame is the invocation frame.
  const declarationFrame = frames.find((frame) => {
    return !(SOURCE_FRAME.test(frame) || BUILD_FRAME.test(frame))
  })

  if (!declarationFrame) {
    return
  }

  // Extract file reference from the stack frame.
  const declarationPath = declarationFrame
    .replace(/\s*at [^()]*\(([^)]+)\)/, '$1')
    .replace(/^@/, '')
  return declarationPath
}