feature: @putout/printer: TSTypeParameter inside TSMappedType: extend…

…s -> in (coderaiser/putout#185)

lib/tokenize/typescript/index.js

@@ -3,7 +3,7 @@
 const {isNext} = require('../is');
 const {TSTypeLiteral} = require('./type/ts-type-literal');
 const {TSTypeAliasDeclaration} = require('./type/ts-type-alias-declaration');
-const {TSMappedType} = require('./ts-mapped-type');
+const {TSMappedType} = require('./mapped-type/ts-mapped-type');
 const {TSConditionalType} = require('./ts-conditional-type');
 const {TSTypeParameter} = require('./type/ts-type-parameter');
 const {TSDeclareFunction} = require('./function/ts-declare-function');

lib/tokenize/typescript/mapped-type/fixture/ts-mapped-type-in.ts

@@ -0,0 +1,7 @@
+type Status = 'active';
+
+const data: {
+    [key in Status]: null;
+} = {
+    active: null,
+};

lib/tokenize/typescript/ts-mapped-type.spec.js → lib/tokenize/typescript/mapped-type/ts-mapped-type.spec.js

@@ -1,8 +1,8 @@
 'use strict';
 
 const {extend} = require('supertape');
-const {printExtension} = require('../../../test/printer');
-const {readFixtures} = require('../../../test/fixture');
+const {printExtension} = require('../../../../test/printer');
+const {readFixtures} = require('../../../../test/fixture');
 const fixture = readFixtures(__dirname);
 
 const test = extend({
@@ -13,3 +13,8 @@ test('printer: tokenizer: typescript: TSMappedType: nameType', (t) => {
     t.print(fixture.tsMappedTypeNameType);
     t.end();
 });
+
+test('printer: tokenizer: typescript: TSMappedType: in', (t) => {
+    t.print(fixture.tsMappedTypeIn);
+    t.end();
+});

lib/tokenize/typescript/type/ts-type-parameter.js

@@ -17,7 +17,7 @@ module.exports.TSTypeParameter = (path, {write, traverse}) => {
     if (!exists(constraint))
         return;
 
-    if (constraint.isTSTypeOperator()) {
+    if (constraint.isTSTypeOperator() || path.parentPath.isTSMappedType()) {
         write(' in ');
     } else {
         write(' extends ');