Support Node-style format aliases (#2783)

* support Node-style format aliases * remove unnecessary fallback * add formats to typings
rollup · Apr 2, 2019 · 8825cdb · 8825cdb
1 parent f5a6c30
commit 8825cdb
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Showing 2 changed files with 21 additions and 2 deletions.
diff --git a/src/rollup/types.d.ts b/src/rollup/types.d.ts
@@ -287,7 +287,16 @@ export interface InputOptions {
 	watch?: WatcherOptions;
 }
 
-export type ModuleFormat = 'amd' | 'cjs' | 'system' | 'es' | 'esm' | 'iife' | 'umd';
+export type ModuleFormat =
+	| 'amd'
+	| 'cjs'
+	| 'commonjs'
+	| 'es'
+	| 'esm'
+	| 'iife'
+	| 'module'
+	| 'system'
+	| 'umd';
 
 export type OptionsPaths = Record<string, string> | ((id: string) => string);
 

diff --git a/src/utils/mergeOptions.ts b/src/utils/mergeOptions.ts
@@ -229,7 +229,17 @@ function getOutputOptions(
 	command: GenericConfigObject = {}
 ): OutputOptions {
 	const getOption = createGetOption(config, command);
-	const format = getOption('format');
+	let format = getOption('format');
+
+	// Handle format aliases
+	switch (format) {
+		case 'esm':
+		case 'module':
+			format = 'es';
+			break;
+		case 'commonjs':
+			format = 'cjs';
+	}
 
 	return {
 		amd: { ...config.amd, ...command.amd },