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src, anchor, offset, [\n        header,\n        ...newSrc.split('\\n'),\n        `${comment} @generated end ${tag}`,\n      ]),\n      didMerge: true,\n      didClear: !!sanitizedTarget,\n    };\n  }\n  return { contents: src, didClear: false, didMerge: false };\n}\n\nexport function removeContents({ src, tag }: { src: string; tag: string }): MergeResults {\n  // Ensure the old generated contents are removed.\n  const sanitizedTarget = removeGeneratedContents(src, tag);\n  return {\n    contents: sanitizedTarget ?? src,\n    didMerge: false,\n    didClear: !!sanitizedTarget,\n  };\n}\n\nfunction addLines(content: string, find: string | RegExp, offset: number, toAdd: string[]) {\n  const lines = content.split('\\n');\n\n  let lineIndex = lines.findIndex(line => line.match(find));\n  if (lineIndex < 0) {\n    const error = new Error(`Failed to match \"${find}\" in contents:\\n${content}`);\n    // @ts-ignore\n    error.code = 'ERR_NO_MATCH';\n    throw error;\n  }\n  for (const newLine of toAdd) {\n    lines.splice(lineIndex + offset, 0, newLine);\n    lineIndex++;\n  }\n\n  return lines.join('\\n');\n}\n\n/**\n * Removes the generated section from a file, returns null when nothing can be removed.\n * This sways heavily towards not removing lines unless it's certain that modifications were not made manually.\n *\n * @param src\n */\nexport function removeGeneratedContents(src: string, tag: string): string | null {\n  const { contents, start, end } = getGeneratedSectionIndexes(src, tag);\n  if (start > -1 && end > -1 && start < end) {\n    contents.splice(start, end - start + 1);\n    // TODO: We could in theory check that the contents we're removing match the hash used in the header,\n    // this would ensure that we don't accidentally remove lines that someone added or removed from the generated section.\n    return contents.join('\\n');\n  }\n  return null;\n}\n\nexport function createGeneratedHeaderComment(\n  contents: string,\n  tag: string,\n  comment: string\n): string {\n  const hashKey = createHash(contents);\n\n  // Everything after the `${tag} ` is unversioned and can be freely modified without breaking changes.\n  return `${comment} @generated begin ${tag} - expo prebuild (DO NOT MODIFY) ${hashKey}`;\n}\n\nexport function createHash(src: string): string {\n  // this doesn't need to be secure, the shorter the better.\n  const hash = crypto.createHash('sha1').update(src).digest('hex');\n  return `sync-${hash}`;\n}\n"]}