global-require

此规则在 ESLint v7.0.0 中已弃用。请使用 eslint-plugin-node 中的相应规则。

在 Node.js 中，模块依赖是使用 require() 函数包含的，例如：

var fs = require("fs");

虽然 require() 可以在代码中的任何位置调用，但一些样式指南规定它只能在模块的顶层调用，以便更容易识别依赖关系。例如，当它们深深嵌套在函数和其他语句中时，可以说更难识别依赖关系：

function foo() {
    if (condition) {
        var fs = require("fs");
    }
}

由于 require() 进行同步加载，因此在其他位置使用时可能会导致性能问题。

此外，ES6 模块要求 import 和 export 语句只能出现在模块主体的顶层。

规则详情

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Wk+Mu7oFIccqpNSe5orR05ZG/BDV40hHIKzF0SoJnVcuS8r6evQjx3oyoFn9+fZT

/*eslint global-require: "error"*/
/*eslint-env es6*/

// calling require() inside of a function is not allowed
function readFile(filename, callback) {
    var fs = require("fs");
    fs.readFile(filename, callback);
}

// conditional requires like this are also not allowed
if (DEBUG) {
    require("debug");
}

// a require() in a switch statement is also flagged
switch (x) {
    case "1":
        require("1");
        break;
}

// you may not require() inside an arrow function body
var getModule = (name) => require(name);

// you may not require() inside of a function body as well
function getModule(name) {
    return require(name);
}

// you may not require() inside of a try/catch block
try {
    require(unsafeModule);
} catch (e) {
    console.log(e);
}

UubGaThNGVSAZCEeqgdAAx/QE1uwW/De5ytjPBnKCKqeOsDZpJS0MvQSJQtY0WPI

/*eslint global-require: "error"*/

// all these variations of require() are ok
require("x");
var y = require("y");
var z;
z = require("z").initialize();

// requiring a module and using it in a function is ok
var fs = require("fs");
function readFile(filename, callback) {
    fs.readFile(filename, callback);
}

// you can use a ternary to determine which module to require
var logger = DEBUG ? require("dev-logger") : require("logger");

// if you want you can require() at the end of your module
function doSomethingA() {}
function doSomethingB() {}
var x = require("x"),
    z = require("z");

何时不使用

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