no-import-assign
Disallow assigning to imported bindings
✅ Recommended
The "extends": "eslint:recommended" property in a configuration file enables this rule
ES 模块对导入的绑定的更新会导致运行时错误。
规则细节
这条规则对导入的绑定的分配、增量和减量发出警告。
使用此规则的错误示例：
Open in Playground
/*eslint no-import-assign: "error"*/
import mod, { named } from "./mod.mjs"
import * as mod_ns from "./mod.mjs"
mod = 1 // ERROR: 'mod' is readonly.
named = 2 // ERROR: 'named' is readonly.
mod_ns.named = 3 // ERROR: The members of 'mod_ns' are readonly.
mod_ns = {} // ERROR: 'mod_ns' is readonly.
// Can't extend 'mod_ns'
Object.assign(mod_ns, { foo: "foo" }) // ERROR: The members of 'mod_ns' are readonly.
使用此规则的正确示例：
Open in Playground
/*eslint no-import-assign: "error"*/
import mod, { named } from "./mod.mjs"
import * as mod_ns from "./mod.mjs"
mod.prop = 1
named.prop = 2
mod_ns.named.prop = 3
// Known Limitation
function test(obj) {
obj.named = 4 // Not errored because 'obj' is not namespace objects.
}
test(mod_ns) // Not errored because it doesn't know that 'test' updates the member of the argument.
何时不用
如果你不希望被通知修改导入的绑定，你可以禁用这个规则。
Version
This rule was introduced in ESLint v6.4.0.