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If this is not meant to be a\n            placeholder you may want to consider passing one of the following options to @babel/template:\n            - { placeholderPattern: false, placeholderWhitelist: new Set(['${placeholderName}'])}\n            - { placeholderPattern: /^${placeholderName}$/ }`,\n        );\n      }\n    });\n    Object.keys(replacements).forEach(key => {\n      if (!metadata.placeholderNames.has(key)) {\n        throw new Error(`Unknown substitution \"${key}\" given`);\n      }\n    });\n  }\n\n  // Process in reverse order so AST mutation doesn't change indices that\n  // will be needed for later calls to `placeholder.resolve()`.\n  metadata.placeholders\n    .slice()\n    .reverse()\n    .forEach(placeholder => {\n      try {\n        applyReplacement(\n          placeholder,\n          ast,\n          (replacements && replacements[placeholder.name]) || null,\n        );\n      } catch (e) {\n        e.message = `@babel/template placeholder 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replacement = identifier(replacement);\n    }\n    if (Array.isArray(replacement)) {\n      throw new Error(\"Cannot replace single expression with an array.\");\n    }\n  }\n\n  function set(parent: any, key: any, value: any) {\n    const node = parent[key] as t.Node;\n    parent[key] = value;\n    if (node.type === \"Identifier\" || node.type === \"Placeholder\") {\n      if (node.typeAnnotation) {\n        value.typeAnnotation = node.typeAnnotation;\n      }\n      if (node.optional) {\n        value.optional = node.optional;\n      }\n      if (node.decorators) {\n        value.decorators = node.decorators;\n      }\n    }\n  }\n\n  if (index === undefined) {\n    validate(parent, key, replacement);\n\n    set(parent, key, replacement);\n  } else {\n    const items: Array<t.Node> = (parent as any)[key].slice();\n\n    if (placeholder.type === \"statement\" || placeholder.type === \"param\") {\n      if (replacement == null) {\n        items.splice(index, 1);\n      } else if 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