transformer-macro.js
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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
}