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# rollup-plugin-require-context
rollup plugin for resovling webpack require-context.
## usage
```javascript
import requireContext from 'rollup-plugin-require-context';
export default {
input: 'main.js',
output: {
file: 'bundle.js',
format: 'iife'
},
plugins: [
requireContext()
]
};
```
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{
"name": "rollup-plugin-require-context",
"version": "1.0.0",
"description": "rollup-plugin for webpack requrie-context",
"main": "src/index.js",
"scripts": {
"brk": "node --inspect-brk example/run.js",
"example": "rollup -c example/rollup.config.js",
"test:dev": "jest --watchAll"
},
"repository": {
"type": "git",
"url": "git+https://github.com/elcarim5efil/rollup-plugin-require-context.git"
},
"keywords": [
"rollup",
"plugin",
"require-context",
"webpack-context"
],
"author": "elcarim5efil",
"license": "MIT",
"bugs": {
"url": "https://github.com/elcarim5efil/rollup-plugin-require-context/issues"
},
"homepage": "https://github.com/elcarim5efil/rollup-plugin-require-context#readme",
"dependencies": {
"acorn": "^6.1.1",
"acorn-dynamic-import": "^4.0.0",
"acorn-walk": "^6.1.1",
"rollup-pluginutils": "^2.5.0"
},
"devDependencies": {
"jest": "^24.5.0",
"rollup": "^1.7.4",
"rollup-plugin-virtual": "^1.0.1"
}
}
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const Path = require('path')
const { parse } = require('acorn')
const walk = require('acorn-walk')
function stripHeadAndTailChar (str) {
return str.substring(1, str.length - 1)
}
function extract (code) {
return new Promise((resolve, reject) => {
const ast = parse(code, {
sourceType: 'module'
})
const res = []
walk.simple(ast, {
CallExpression (node) {
const {
start,
end,
callee,
arguments: argNodes
} = node
let args = []
if (
callee.type === 'MemberExpression' &&
callee.object.name === 'require' &&
callee.property.name === 'context'
) {
args = argNodes.map(a => a.value)
res.push({
start,
end,
args
})
}
}
})
resolve(res)
})
}
module.exports = async function extractArgs (code, baseDirname) {
const data = await extract(code)
return data.map(r => {
const { start, end, args } = r
const [
rawDirname = '',
rawRecursive,
rawRegexp
] = args
const dirname = Path.join(baseDirname, rawDirname)
const recursive = rawRecursive
const regexp = rawRegexp
return {
dirname,
recursive,
regexp,
start,
end
}
})
}
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const Path = require('path')
const extractArgs = require('./extract-args')
const resolveRequireModules = require('./resolve-reqquire-modules')
const resolveRequireCode = require('./resolve-require-code')
module.exports = async function gernerateRequireContextCode (id, code) {
const currentCodeDirname = Path.dirname(id)
const data = await extractArgs(code, currentCodeDirname)
let head = ''
const body = data.reduceRight((res, r) => {
const {
start, end,
dirname, recursive, regexp
} = r
const modules = resolveRequireModules(dirname, recursive, regexp)
const moduleCode = resolveRequireCode(dirname, modules)
const {
importCode,
requireFnCode
} = moduleCode
head += importCode
res = [
res.slice(0, start),
requireFnCode,
res.slice(end)
].join('')
return res
}, code)
return [
head,
body
].join('\n')
}
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module.exports = function hasRequireContext (code) {
return /require\.context/g.test(code)
}
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const fs = require('fs')
const Path = require('path')
function readDirRecursive (dir) {
return fs.statSync(dir).isDirectory()
? Array.prototype.concat(
...fs.readdirSync(dir).map(f => readDirRecursive(Path.join(dir, f)))
)
: dir
}
function readDir (dir, recursive) {
const isDirectory = fs.statSync(dir).isDirectory()
if (recursive) {
return readDirRecursive(dir)
} else if (isDirectory) {
const files = fs.readdirSync(dir)
if (files) {
return files.map(file => Path.resolve(dir, file))
}
} else {
return [ dir ]
}
}
module.exports = function resolveRequireModules (baseDirname = './', recursive = false, regexp = /^\.\//) {
let files = readDir(baseDirname, recursive)
if (!Array.isArray(files)) {
files = [files]
}
files = files.map(file => {
const fileAbsolutePath = `./${Path.relative(baseDirname, file)}`
return fileAbsolutePath
})
return files.filter(file => regexp.test(file.replace(/\\/g, '/')))
}
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const Path = require('path')
let uid = 0
function getUID () {
return uid++
}
function genImportCode (name, path) {
return `import * as ${name} from '${path}';\n`
}
function genPropsCode (key, value) {
return `'${key}': ${value},\n`
}
module.exports = function genRequireCode (baseDirname, modules) {
const uid = getUID()
let importCode = ''
let moduleProps = ''
modules.forEach((file, index) => {
const moduleName = `require_context_module_${uid}_${index}`
const moduleAbsolutePath = Path.resolve(baseDirname, file).replace(/\\/g, '/')
importCode += genImportCode(moduleName, moduleAbsolutePath)
moduleProps += genPropsCode(file.replace(/\\/g, '/'), moduleName)
})
const requireFnCode = (`
(function() {
var map = {
${moduleProps}
};
var req = function req(key) {
return map[key] || (function() { throw new Error("Cannot find module '" + key + "'.") }());
}
req.keys = function() {
return Object.keys(map);
}
return req;
})()
`)
return {
importCode,
requireFnCode
}
}
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const _ = require('rollup-pluginutils')
const hasRequireContext = require('./helper/has-require-context')
const gernerateRequireContextCode = require('./helper/generate-require-context-code')
module.exports = function plugin (options = {}) {
const filter = _.createFilter(options.include || ['**/*.js'], options.exclude || 'node_modules/**')
return {
name: 'require_content',
async transform (code, id) {
if (!filter(id) || !hasRequireContext(code)) {
return
}
code = await gernerateRequireContextCode(id, code)
return code
}
}
}