fix: include indentation when counting line width

lib/rules/decorator-position.js

@@ -140,7 +140,7 @@ function decoratorPositionRule(context) {
   const userOptions = context.options[0] || {};
   const filePath = context.getFilename();
   const { printWidth } = lineLength(userOptions, filePath);
-  const options = normalizeOptions({ ...userOptions, printWidth: printWidth + 1 });
+  const options = normalizeOptions({ ...userOptions, printWidth });
 
   return {
     'ClassProperty[decorators.length=1]:exit'(node) {
@@ -382,7 +382,11 @@ function lengthAsInline(context, node) {
   // - property name
   // - type annotation (and !)
   // - etc
-  return context.getSourceCode().getText(node).replace(/\s+/, ' ').length;
+  return (
+    context.getSourceCode().getText(node).replace(/\s+/, ' ').length +
+    // this is the only way to get indentation?
+    node.loc.start.column
+  );
 }
 
 function decoratorInfo(context, node, decoratorConfig, options) {

package.json

@@ -20,6 +20,7 @@
     "test": "jest",
     "test:debug": "node --inspect node_modules/.bin/jest --runInBand",
     "test:debug-watch": "node --inspect node_modules/.bin/jest --watch --runInBand",
+    "test:debug:named": "node --inspect node_modules/.bin/jest --runInBand --watch --testNamePattern",
     "test:coverage": "jest --coverage",
     "test:watch": "jest --watchAll",
     "update": "node ./scripts/update-rules.js",

tests/lib/rules/decorator-position-js.js

@@ -116,9 +116,13 @@ ruleTester.run('JS: decorator-position', rule, {
     {
       code: stripIndent`
         class Foo {
-          @foo('bizbangbarbazboo') fizz;
+          // 32 characters
+          @foo('bizbangbarbazboo')
+          fizz;
 
-          @action('bidgbarbazboo') fizz;
+          // 32 characters
+          @action('bidgbarbazboo')
+          fizz;
         }
       `,
       options: [{ printWidth: 30 }],
@@ -154,6 +158,7 @@ ruleTester.run('JS: decorator-position', rule, {
     {
       code: stripIndent`
         class Foo {
+          // one character over inline max printWidth
           @foo('bizbangbarbazboo')
           fizz;
         }