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@typescript-eslint/prefer-readonly
更新时间: 2026-06-24 07:08
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如果私有成员从未在构造函数之外进行修改，则要求将其标记为“只读”。
规则配置
// code-linter.json5
{
"rules": {
"@typescript-eslint/prefer-readonly": "error"
}
} 正例
export class Container {
// Public members might be modified externally
public publicMember: boolean = true;
// Protected members might be modified by child classes
protected protectedMember: number = Number.MAX_VALUE;
// This is modified later on by the class
private modifiedLater = 'unchanged';
public mutate() {
this.modifiedLater = 'mutated';
}
} 反例
export class Container {
// These member variables could be marked as readonly
private neverModifiedMember = true;
private onlyModifiedInConstructor: number;
// Private parameter properties can also be marked as readonly
private neverModifiedParameter: string;
public constructor(
onlyModifiedInConstructor: number,
// Private parameter properties can also be marked as readonly
neverModifiedParameter: string,
) {
this.neverModifiedParameter = neverModifiedParameter;
this.onlyModifiedInConstructor = onlyModifiedInConstructor;
}
} 
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