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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 \"${placeholder.name}\": ${e.message}`;\n throw e;\n }\n });\n\n return ast;\n}\n\nfunction applyReplacement(\n placeholder: Placeholder,\n ast: t.File,\n replacement: any,\n) {\n // Track inserted nodes and clone them if they are inserted more than\n // once to avoid injecting the same node multiple times.\n if (placeholder.isDuplicate) {\n if (Array.isArray(replacement)) {\n replacement = replacement.map(node => cloneNode(node));\n } else if (typeof replacement === \"object\") {\n replacement = cloneNode(replacement);\n }\n }\n\n const { parent, key, index } = placeholder.resolve(ast);\n\n if (placeholder.type === \"string\") {\n if (typeof replacement === \"string\") {\n replacement = stringLiteral(replacement);\n }\n if (!replacement || !isStringLiteral(replacement)) {\n throw new Error(\"Expected string substitution\");\n }\n } else if (placeholder.type === \"statement\") {\n if (index === undefined) {\n if (!replacement) {\n replacement = emptyStatement();\n } else if (Array.isArray(replacement)) {\n replacement = blockStatement(replacement);\n } else if (typeof replacement === \"string\") {\n replacement = 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