feat: update the indent rule for class static blocks (#15324)

Updates the `indent` rule to apply to class static blocks.

Adds `StaticBlock.body` option that enforces indentation level for the body of a class static block.

Refs #15016

docs/rules/indent.md

@@ -79,6 +79,8 @@ This rule has an object option:
 * `"FunctionExpression"` takes an object to define rules for function expressions.
     * `parameters` (default: 1) enforces indentation level for parameters in a function expression. This can either be a number indicating indentation level, or the string `"first"` indicating that all parameters of the expression must be aligned with the first parameter. This can also be set to `"off"` to disable checking for FunctionExpression parameters.
     * `body` (default: 1) enforces indentation level for the body of a function expression.
+* `"StaticBlock"` takes an object to define rules for class static blocks.
+    * `body` (default: 1) enforces indentation level for the body of a class static block.
 * `"CallExpression"` takes an object to define rules for function call expressions.
     * `arguments` (default: 1) enforces indentation level for arguments in a call expression. This can either be a number indicating indentation level, or the string `"first"` indicating that all arguments of the expression must be aligned with the first argument. This can also be set to `"off"` to disable checking for CallExpression arguments.
 * `"ArrayExpression"` (default: 1) enforces indentation level for elements in arrays. It can also be set to the string `"first"`, indicating that all the elements in the array should be aligned with the first element. This can also be set to `"off"` to disable checking for array elements.
@@ -484,6 +486,56 @@ var foo = function(bar, baz,
 }
 ```
 
+### StaticBlock
+
+Examples of **incorrect** code for this rule with the `2, { "StaticBlock": {"body": 1} }` option:
+
+```js
+/*eslint indent: ["error", 2, { "StaticBlock": {"body": 1} }]*/
+
+class C {
+  static {
+      foo();
+  }
+}
+```
+
+Examples of **correct** code for this rule with the `2, { "StaticBlock": {"body": 1} }` option:
+
+```js
+/*eslint indent: ["error", 2, { "StaticBlock": {"body": 1} }]*/
+
+class C {
+  static {
+    foo();
+  }
+}
+```
+
+Examples of **incorrect** code for this rule with the `2, { "StaticBlock": {"body": 2} }` option:
+
+```js
+/*eslint indent: ["error", 2, { "StaticBlock": {"body": 2} }]*/
+
+class C {
+  static {
+    foo();
+  }
+}
+```
+
+Examples of **correct** code for this rule with the `2, { "StaticBlock": {"body": 2} }` option:
+
+```js
+/*eslint indent: ["error", 2, { "StaticBlock": {"body": 2} }]*/
+
+class C {
+  static {
+      foo();
+  }
+}
+```
+
 ### CallExpression
 
 Examples of **incorrect** code for this rule with the `2, { "CallExpression": {"arguments": 1} }` option:

lib/rules/indent.js

@@ -68,6 +68,7 @@ const KNOWN_NODES = new Set([
     "ReturnStatement",
     "SequenceExpression",
     "SpreadElement",
+    "StaticBlock",
     "Super",
     "SwitchCase",
     "SwitchStatement",
@@ -583,6 +584,16 @@ module.exports = {
                         },
                         additionalProperties: false
                     },
+                    StaticBlock: {
+                        type: "object",
+                        properties: {
+                            body: {
+                                type: "integer",
+                                minimum: 0
+                            }
+                        },
+                        additionalProperties: false
+                    },
                     CallExpression: {
                         type: "object",
                         properties: {
@@ -646,6 +657,9 @@ module.exports = {
                 parameters: DEFAULT_PARAMETER_INDENT,
                 body: DEFAULT_FUNCTION_BODY_INDENT
             },
+            StaticBlock: {
+                body: DEFAULT_FUNCTION_BODY_INDENT
+            },
             CallExpression: {
                 arguments: DEFAULT_PARAMETER_INDENT
             },
@@ -1397,6 +1411,13 @@ module.exports = {
                 }
             },
 
+            StaticBlock(node) {
+                const openingCurly = sourceCode.getFirstToken(node, { skip: 1 }); // skip the `static` token
+                const closingCurly = sourceCode.getLastToken(node);
+
+                addElementListIndent(node.body, openingCurly, closingCurly, options.StaticBlock.body);
+            },
+
             SwitchStatement(node) {
                 const openingCurly = sourceCode.getTokenAfter(node.discriminant, astUtils.isOpeningBraceToken);
                 const closingCurly = sourceCode.getLastToken(node);