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rOACCT/node_modules/@emotion/babel-plugin/src/utils/transformer-macro.js
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transformer-macro.js
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			// @flow
			import { createMacro } from 'babel-plugin-macros'

			type Transformer = Function

			export function createTransformerMacro(
			transformers: { [key: string]: Transformer \| [Transformer, Object] },
			{ importSource }: { importSource: string }
			) {
			let macro = createMacro(
			({ path, source, references, state, babel, isEmotionCall }) => {
			if (!path) {
			path = state.file.scope.path
			.get('body')
			.find(p => p.isImportDeclaration() && p.node.source.value === source)
			}

			if (/\/macro$/.test(source)) {
			path
			.get('source')
			.replaceWith(
			babel.types.stringLiteral(source.replace(/\/macro$/, ''))
			)
			}

			if (!isEmotionCall) {
			state.emotionSourceMap = true
			}
			Object.keys(references).forEach(importSpecifierName => {
			if (transformers[importSpecifierName]) {
			references[importSpecifierName].reverse().forEach(reference => {
			let options
			let transformer
			if (Array.isArray(transformers[importSpecifierName])) {
			transformer = transformers[importSpecifierName][0]
			options = transformers[importSpecifierName][1]
			} else {
			transformer = transformers[importSpecifierName]
			options = {}
			}
			transformer({
			state,
			babel,
			path,
			importSource,
			importSpecifierName,
			options,
			reference
			})
			})
			}
			})
			return { keepImports: true }
			}
			)
			macro.transformers = transformers
			return macro
			}