Keep indentation in @component documentation comments

packages/svelte2tsx/package.json

@@ -59,6 +59,7 @@
         "svelte-shims.d.ts"
     ],
     "dependencies": {
+        "dedent-js": "^1.0.1",
         "pascal-case": "^3.1.1"
     }
 }

packages/svelte2tsx/src/svelte2tsx.ts

@@ -1,3 +1,4 @@
+import dedent from 'dedent-js';
 import { pascalCase } from 'pascal-case';
 import MagicString from 'magic-string';
 import path from 'path';
@@ -792,12 +793,15 @@ function processInstanceScriptContent(str: MagicString, script: Node): InstanceS
 
 function formatComponentDocumentation(contents?: string | null) {
     if (!contents) return '';
-
     if (!contents.includes('\n')) {
         return `/** ${contents} */\n`;
     }
 
-    const lines = contents.split('\n').map(line => ` *${line ? ` ${line}` : ''}`).join('\n');
+    const lines = dedent(contents)
+        .split('\n')
+        .map(line => ` *${line ? ` ${line}` : ''}`)
+        .join('\n');
+
     return `/**\n${lines}\n */\n`;
 }
 

packages/svelte2tsx/test/svelte2tsx/samples/component-with-indented-multiline-documentation/expected.tsx

@@ -0,0 +1,23 @@
+<></>;function render() {
+<>
+
+<main>At least I am documented</main></>
+return { props: {}, slots: {} }}
+
+/**
+ * This component has indented multiline documentation:
+ *
+ * ```typescript
+ * type Type = 'type'
+ * ```
+ *
+ * An indented list:
+ *   - One item
+ *   - Two items
+ *
+ * The output should be indented properly!
+ */
+export default class Input {
+    $$prop_def = __sveltets_partial(render().props)
+    $$slot_def = render().slots
+}

packages/svelte2tsx/test/svelte2tsx/samples/component-with-indented-multiline-documentation/input.svelte

@@ -0,0 +1,16 @@
+<!--
+  @component
+  This component has indented multiline documentation:
+
+  ```typescript
+  type Type = 'type'
+  ```
+
+  An indented list:
+    - One item
+    - Two items
+
+  The output should be indented properly!
+-->
+
+<main>At least I am documented</main>

yarn.lock

@@ -611,6 +611,11 @@ decamelize@^1.2.0:
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
   integrity sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=
 
+dedent-js@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/dedent-js/-/dedent-js-1.0.1.tgz#bee5fb7c9e727d85dffa24590d10ec1ab1255305"
+  integrity sha1-vuX7fJ5yfYXf+iRZDRDsGrElUwU=
+
 deep-is@~0.1.3:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"