prefer-destructuring

要求从数组和/或对象解构.

🔧

此规则报告的一些问题可通过 --fix ESLint 命令行选项自动修复。

💭

该规则需要 类型信息 才能运行，但这会带来性能方面的权衡。

🧱

This is an "extension" rule that replaces a core ESLint rule to work with TypeScript. See Rules > Extension Rules.

This rule extends the base prefer-destructuring rule from ESLint core. 它在变量声明中添加了对 TypeScript 类型注释的支持。

¥It adds support for TypeScript's type annotations in variable declarations.

示例

¥Examples

`eslint/prefer-destructuring`

const x: string = obj.x; // This is incorrect and the auto fixer provides following untyped fix.
// const { x } = obj;

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`@typescript-eslint/prefer-destructuring`

const x: string = obj.x; // This is correct by default. You can also forbid this by an option.

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借助类型检查器，它可以更准确地推断绑定模式。

¥And it infers binding patterns more accurately thanks to the type checker.

❌ 错误

const x = ['a'];
const y = x[0];

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✅ 正确

const x = { 0: 'a' };
const y = x[0];

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当 enforceForRenamedProperties 不为真时，这是正确的。有效的解构语法被重命名为 { 0: y } = x 而不是 [y] = x，因为 x 不可迭代。

¥It is correct when enforceForRenamedProperties is not true. Valid destructuring syntax is renamed style like { 0: y } = x rather than [y] = x because x is not iterable.

如何使用

扁平配置

eslint.config.mjs

export default tseslint.config({
  rules: {
    // Note: you must disable the base rule as it can report incorrect errors
    "prefer-destructuring": "off",
    "@typescript-eslint/prefer-destructuring": "error"
  }
});

旧版配置

.eslintrc.cjs

module.exports = {
  "rules": {
    // Note: you must disable the base rule as it can report incorrect errors
    "prefer-destructuring": "off",
    "@typescript-eslint/prefer-destructuring": "error"
  }
};

在线运行试试这个规则 ↗

选项

See eslint/prefer-destructuring's options.

¥Options

该规则添加了以下选项：

¥This rule adds the following options:

type Options = [
  BasePreferDestructuringOptions[0],
  BasePreferDestructuringOptions[1] & {
    enforceForDeclarationWithTypeAnnotation?: boolean;
  },
];

const defaultOptions: Options = [
  basePreferDestructuringDefaultOptions[0],
  {
    ...basePreferDestructuringDefaultOptions[1],
    enforceForDeclarationWithTypeAnnotation: false,
  },
];

enforceForDeclarationWithTypeAnnotation

带有 { enforceForDeclarationWithTypeAnnotation: true } 的示例：

¥Examples with { enforceForDeclarationWithTypeAnnotation: true }:

❌ 错误

const x: string = obj.x;

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✅ 正确

const { x }: { x: string } = obj;

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何时不使用它

Type checked lint rules are more powerful than traditional lint rules, but also require configuring type checked linting.

See Troubleshooting > Linting with Type Information > Performance if you experience performance degradations after enabling type checked rules.

资源

• 规则源码
• 测试源码

^{Taken with ❤️ from ESLint core.}