fix: add defaultStringType option to yaml.stringify calls

- Added defaultStringType: 'PLAIN' to minimize formatting changes
- This helps preserve plain scalars when possible
- Works alongside lineWidth: 0 to prevent automatic line wrapping

Author: hannesrudolph

src/core/config/CustomModesManager.ts

@@ -213,7 +213,12 @@ export class CustomModesManager {
 		const fileExists = await fileExistsAtPath(filePath)
 
 		if (!fileExists) {
-			await this.queueWrite(() => fs.writeFile(filePath, yaml.stringify({ customModes: [] }, { lineWidth: 0 })))
+			await this.queueWrite(() =>
+				fs.writeFile(
+					filePath,
+					yaml.stringify({ customModes: [] }, { lineWidth: 0, defaultStringType: "PLAIN" }),
+				),
+			)
 		}
 
 		return filePath
@@ -418,7 +423,7 @@ export class CustomModesManager {
 			content = await fs.readFile(filePath, "utf-8")
 		} catch (error) {
 			// File might not exist yet.
-			content = yaml.stringify({ customModes: [] }, { lineWidth: 0 })
+			content = yaml.stringify({ customModes: [] }, { lineWidth: 0, defaultStringType: "PLAIN" })
 		}
 
 		let settings
@@ -431,7 +436,7 @@ export class CustomModesManager {
 		}
 
 		settings.customModes = operation(settings.customModes || [])
-		await fs.writeFile(filePath, yaml.stringify(settings, { lineWidth: 0 }), "utf-8")
+		await fs.writeFile(filePath, yaml.stringify(settings, { lineWidth: 0, defaultStringType: "PLAIN" }), "utf-8")
 	}
 
 	private async refreshMergedState(): Promise<void> {
@@ -490,7 +495,10 @@ export class CustomModesManager {
 	public async resetCustomModes(): Promise<void> {
 		try {
 			const filePath = await this.getCustomModesFilePath()
-			await fs.writeFile(filePath, yaml.stringify({ customModes: [] }, { lineWidth: 0 }))
+			await fs.writeFile(
+				filePath,
+				yaml.stringify({ customModes: [] }, { lineWidth: 0, defaultStringType: "PLAIN" }),
+			)
 			await this.context.globalState.update("customModes", [])
 			this.clearCache()
 			await this.onUpdate()

src/services/marketplace/SimpleInstaller.ts

@@ -84,7 +84,7 @@ export class SimpleInstaller {
 
 		// Write back to file
 		await fs.mkdir(path.dirname(filePath), { recursive: true })
-		const yamlContent = yaml.stringify(existingData, { lineWidth: 0 })
+		const yamlContent = yaml.stringify(existingData, { lineWidth: 0, defaultStringType: "PLAIN" })
 		await fs.writeFile(filePath, yamlContent, "utf-8")
 
 		// Calculate approximate line number where the new mode was added
@@ -282,7 +282,11 @@ export class SimpleInstaller {
 				existingData.customModes = existingData.customModes.filter((mode: any) => mode.slug !== modeData.slug)
 
 				// Always write back the file, even if empty
-				await fs.writeFile(filePath, yaml.stringify(existingData, { lineWidth: 0 }), "utf-8")
+				await fs.writeFile(
+					filePath,
+					yaml.stringify(existingData, { lineWidth: 0, defaultStringType: "PLAIN" }),
+					"utf-8",
+				)
 			}
 		} catch (error: any) {
 			if (error.code === "ENOENT") {

src/utils/migrateSettings.ts

@@ -93,7 +93,7 @@ async function migrateCustomModesToYaml(settingsDir: string, outputChannel: vsco
 			const customModesData = yaml.parse(jsonContent)
 
 			// Convert to YAML with no line width limit to prevent line breaks
-			const yamlContent = yaml.stringify(customModesData, { lineWidth: 0 })
+			const yamlContent = yaml.stringify(customModesData, { lineWidth: 0, defaultStringType: "PLAIN" })
 
 			// Write YAML file
 			await fs.writeFile(newYamlPath, yamlContent, "utf-8")