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feat(linter): implement noUselessStringRaw (#4263)
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103 changes: 103 additions & 0 deletions
103
crates/biome_js_analyze/src/lint/nursery/no_useless_string_raw.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| use biome_analyze::{context::RuleContext, declare_lint_rule, Ast, Rule, RuleDiagnostic}; | ||
| use biome_console::markup; | ||
| use biome_js_syntax::{AnyJsTemplateElement, JsTemplateExpression}; | ||
| use biome_rowan::{AstNode, AstNodeList}; | ||
|
|
||
| declare_lint_rule! { | ||
| /// Disallow unnecessary `String.raw` function in template string literals without any escape sequence. | ||
| /// | ||
| /// `String.raw` is useless when contains a raw string without any escape-like sequence. | ||
| /// | ||
| /// ## Examples | ||
| /// | ||
| /// ### Invalid | ||
| /// | ||
| /// ```js,expect_diagnostic | ||
| /// String.raw`a`; | ||
| /// ``` | ||
| /// | ||
| /// ```js,expect_diagnostic | ||
| /// String.raw`a ${v}`; | ||
| /// ``` | ||
| /// | ||
| /// ### Valid | ||
| /// | ||
| /// ```js | ||
| /// String.raw`\n ${a}`; | ||
| /// ``` | ||
| /// | ||
| /// ```js | ||
| /// String.raw`\n`; | ||
| /// ``` | ||
| pub NoUselessStringRaw { | ||
| version: "next", | ||
| name: "noUselessStringRaw", | ||
| language: "js", | ||
| recommended: false, | ||
| } | ||
| } | ||
|
|
||
| impl Rule for NoUselessStringRaw { | ||
| type Query = Ast<JsTemplateExpression>; | ||
| type State = (); | ||
| type Signals = Option<Self::State>; | ||
| type Options = (); | ||
|
|
||
| fn run(ctx: &RuleContext<Self>) -> Self::Signals { | ||
| let node = ctx.query(); | ||
| let tag = node.tag()?; | ||
| let tag = tag.as_js_static_member_expression()?; | ||
|
|
||
| let object = tag.object().ok()?; | ||
| let object_expr = object.as_js_identifier_expression()?; | ||
| let object_name = object_expr.name().ok()?.value_token().ok()?; | ||
| let object_name = object_name.text_trimmed(); | ||
|
|
||
| let member = tag.member().ok()?; | ||
| let member_name = member.as_js_name()?.value_token().ok()?; | ||
| let member_name = member_name.text_trimmed(); | ||
|
|
||
| if object_name != "String" || member_name != "raw" { | ||
| return None; | ||
| } | ||
|
|
||
| if can_remove_string_raw(node) { | ||
| Some(()) | ||
| } else { | ||
| None | ||
| } | ||
| } | ||
|
|
||
| fn diagnostic(ctx: &RuleContext<Self>, _state: &Self::State) -> Option<RuleDiagnostic> { | ||
| let node = ctx.query(); | ||
| Some( | ||
| RuleDiagnostic::new( | ||
| rule_category!(), | ||
| node.range(), | ||
| markup! { | ||
| "String.raw is useless when the raw string doesn't contain any escape sequence." | ||
| }, | ||
| ) | ||
| .note(markup! { | ||
| "Remove the String.raw call beacause it's useless here, String.raw can deal with string which contains escape sequence like \\n, \\t, \\r, \\\\, \\\", \\\'." | ||
| }), | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| fn can_remove_string_raw(node: &JsTemplateExpression) -> bool { | ||
| !node.elements().iter().any(|element| { | ||
| match element { | ||
| AnyJsTemplateElement::JsTemplateElement(_) => false, | ||
| AnyJsTemplateElement::JsTemplateChunkElement(chunk) => { | ||
| match chunk.template_chunk_token() { | ||
| Ok(token) => token.text().contains('\\'), | ||
| Err(_) => { | ||
| // if found an error, return `true` means `String.raw` can't remove | ||
| true | ||
| } | ||
| } | ||
| } | ||
| } | ||
| }) | ||
| } |
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