{"record":{"id":"cb1c675a7c37a666","repo":"oxc-project/oxc","slug":"do-not-use-chained-assignment","errorCode":null,"errorMessage":"Do not use chained assignment","messagePattern":"Do not use chained assignment","errorType":"validation","errorClass":"OxcDiagnostic","httpStatus":null,"severity":"error","filePath":"crates/oxc_linter/src/rules/eslint/no_multi_assign.rs","lineNumber":15,"sourceCode":"use oxc_ast::{AstKind, ast::Expression};\nuse oxc_diagnostics::OxcDiagnostic;\nuse oxc_macros::declare_oxc_lint;\nuse oxc_span::Span;\nuse schemars::JsonSchema;\nuse serde::Deserialize;\n\nuse crate::{\n    AstNode,\n    context::LintContext,\n    rule::{DefaultRuleConfig, Rule},\n};\n\nfn no_multi_assign_diagnostic(span: Span) -> OxcDiagnostic {\n    OxcDiagnostic::warn(\"Do not use chained assignment\")\n        .with_help(\"Separate each assignment into its own statement\")\n        .with_label(span)\n}\n\n#[derive(Debug, Default, Clone, JsonSchema, Deserialize)]\n#[serde(rename_all = \"camelCase\", default, deny_unknown_fields)]\npub struct NoMultiAssign {\n    /// When set to `true`, the rule allows chains that don't include initializing a variable in a declaration or initializing a class field.\n    ///\n    /// Examples of **correct** code for this option set to `true`:\n    /// ```js\n    /// let a;\n    /// let b;\n    /// a = b = \"baz\";\n    ///\n    /// const x = {};\n    /// const y = {};\n    /// x.one = y.one = 1;","sourceCodeStart":1,"sourceCodeEnd":33,"githubUrl":"https://github.com/oxc-project/oxc/blob/e1e7af627c8843ab64044ed466b128fcc21a035b/crates/oxc_linter/src/rules/eslint/no_multi_assign.rs#L1-L33","documentation":"Lint diagnostic from eslint/no-multi-assign: an assignment expression is chained (a = b = c). Chained assignment makes the intermediate value flow hard to follow and frequently hides unintended sharing of references.","triggerScenarios":"Thrown at crates/oxc_linter/src/rules/eslint/no_multi_assign.rs:15 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Split the chain into separate assignment statements","Initialize each variable with its own expression"],"exampleFix":null,"handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"e1e7af627c8843ab64044ed466b128fcc21a035b","analyzedAt":"2026-08-20T07:01:07.079Z","contentChangedAt":"2026-08-20T07:01:07.079Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}