const localResolve = require('./local-resolve-helper')
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/**
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* Applies the moduleNameMapper substitution from the jest config
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*
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* @param {String} source - the original string
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* @param {String} filePath - the path of the current file (where the source originates)
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* @param {Object} jestConfig - the jestConfig holding the moduleNameMapper settings
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* @returns {String} path - the final path to import (including replacements via moduleNameMapper)
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*/
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module.exports = function applyModuleNameMapper (source, filePath, jestConfig = {}) {
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if (!jestConfig.moduleNameMapper) return source
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// Extract the moduleNameMapper settings from the jest config. TODO: In case of development via babel@7, somehow the jestConfig.moduleNameMapper might end up being an Array. After a proper upgrade to babel@7 we should probably fix this.
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const module = Array.isArray(jestConfig.moduleNameMapper) ? jestConfig.moduleNameMapper : Object.entries(jestConfig.moduleNameMapper)
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const importPath = module
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.reduce((acc, [regex, replacement]) => {
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const matches = acc.match(regex)
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if (matches === null) {
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return acc
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}
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return replacement.replace(
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/\$([0-9]+)/g,
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(_, index) => matches[parseInt(index, 10)]
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)
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}, source)
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return localResolve(
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filePath,
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importPath
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)
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}
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