Created
May 20, 2020 03:44
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jscodeshift工具方法
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| const j = require('jscodeshift') | |
| /** | |
| * 为代码插入import语句,只能处理import不能处理require,只能插入import语句,其他代码会被忽略 | |
| * @param {*} source | |
| * @param {*} imports | |
| * @copyright 抄自vue-cli/packages/@vue/cli/lib/util/codemods/injectImports.js | |
| */ | |
| module.exports.injectImports = function(source, imports) { | |
| const root = j(source) | |
| const toImportAST = i => j(`${i}\n`).nodes()[0].program.body[0] // 只取第一个语句,一般是Import | |
| const toImportHash = node => JSON.stringify({ | |
| specifiers: node.specifiers.map(s => s.local.name), | |
| source: node.source.raw, | |
| }) | |
| const declarations = root.find(j.ImportDeclaration) | |
| const importSet = new Set(declarations.nodes().map(toImportHash)) | |
| const nonDuplicates = node => !importSet.has(toImportHash(node)) | |
| const importASTNodes = imports.map(toImportAST).filter(nonDuplicates) | |
| if (declarations.length) { | |
| declarations | |
| .at(-1) | |
| // 防止插入后前面多一个空行 | |
| .forEach(({ node }) => delete node.loc) | |
| .insertAfter(importASTNodes) | |
| } else { | |
| // no pre-existing import declarations | |
| root.get().node.program.body.unshift(...importASTNodes) | |
| } | |
| return root.toSource() | |
| } |
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