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node_modules/jest-resolve/node_modules/resolve/lib/sync.js
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var core = require('./core'); | |
var fs = require('fs'); | |
var path = require('path'); | |
var caller = require('./caller.js'); | |
var nodeModulesPaths = require('./node-modules-paths.js'); | |
const memo = {}; | |
module.exports = function (x, options) { | |
if (typeof x !== 'string') { | |
throw new TypeError('Path must be a string.'); | |
} | |
var opts = options || {}; | |
var isFile = opts.isFile || function (file) { | |
if (typeof memo[file] !== 'undefined') { | |
return memo[file]; | |
} | |
try { | |
var stat = fs.statSync(file); | |
} catch (e) { | |
if (e && (e.code === 'ENOENT' || e.code === 'ENOTDIR')) return (memo[file] = false); | |
throw e; | |
} | |
return (memo[file] = stat.isFile() || stat.isFIFO()); | |
}; | |
var readFileSync = opts.readFileSync || fs.readFileSync; | |
var extensions = opts.extensions || ['.js']; | |
var y = opts.basedir || path.dirname(caller()); | |
opts.paths = opts.paths || []; | |
if (/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[/\\])/.test(x)) { | |
var res = path.resolve(y, x); | |
if (x === '..' || x.slice(-1) === '/') res += '/'; | |
var m = loadAsFileSync(res) || loadAsDirectorySync(res); | |
if (m) return m; | |
} else { | |
var n = loadNodeModulesSync(x, y); | |
if (n) return n; | |
} | |
if (core[x]) return x; | |
var err = new Error("Cannot find module '" + x + "' from '" + y + "'"); | |
err.code = 'MODULE_NOT_FOUND'; | |
throw err; | |
function loadAsFileSync(x) { | |
if (isFile(x)) { | |
return x; | |
} | |
for (var i = 0; i < extensions.length; i++) { | |
var file = x + extensions[i]; | |
if (isFile(file)) { | |
return file; | |
} | |
} | |
} | |
function loadAsDirectorySync(x) { | |
var pkgfile = path.join(x, '/package.json'); | |
if (isFile(pkgfile)) { | |
var body = readFileSync(pkgfile, 'utf8'); | |
try { | |
var pkg = JSON.parse(body); | |
if (opts.packageFilter) { | |
pkg = opts.packageFilter(pkg, x); | |
} | |
if (pkg.main) { | |
var m = loadAsFileSync(path.resolve(x, pkg.main)); | |
if (m) return m; | |
var n = loadAsDirectorySync(path.resolve(x, pkg.main)); | |
if (n) return n; | |
} | |
} catch (e) {} | |
} | |
return loadAsFileSync(path.join(x, '/index')); | |
} | |
function loadNodeModulesSync(x, start) { | |
var dirs = nodeModulesPaths(start, opts); | |
for (var i = 0; i < dirs.length; i++) { | |
var dir = dirs[i]; | |
var m = loadAsFileSync(path.join(dir, '/', x)); | |
if (m) return m; | |
var n = loadAsDirectorySync(path.join(dir, '/', x)); | |
if (n) return n; | |
} | |
} | |
}; |
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