more error stuff

src/Bundle.js

@@ -474,7 +474,12 @@ export default class Bundle {
 		const indentString = getIndentString( magicString, options );
 
 		const finalise = finalisers[ options.format ];
-		if ( !finalise ) throw new Error( `You must specify an output type - valid options are ${keys( finalisers ).join( ', ' )}` );
+		if ( !finalise ) {
+			error({
+				code: 'INVALID_OPTION',
+				message: `You must specify an output type - valid options are ${keys( finalisers ).join( ', ' )}`
+			});
+		}
 
 		timeStart( 'render format' );
 

src/Module.js

@@ -121,7 +121,10 @@ export default class Module {
 					const name = specifier.exported.name;
 
 					if ( this.exports[ name ] || this.reexports[ name ] ) {
-						throw new Error( `A module cannot have multiple exports with the same name ('${name}')` );
+						this.error({
+							code: 'DUPLICATE_EXPORT',
+							message: `A module cannot have multiple exports with the same name ('${name}')`
+						}, specifier.start );
 					}
 
 					this.reexports[ name ] = {
@@ -141,8 +144,10 @@ export default class Module {
 			const identifier = ( node.declaration.id && node.declaration.id.name ) || node.declaration.name;
 
 			if ( this.exports.default ) {
-				// TODO indicate location
-				throw new Error( 'A module can only have one default export' );
+				this.error({
+					code: 'DUPLICATE_EXPORT',
+					message: `A module can only have one default export`
+				}, node.start );
 			}
 
 			this.exports.default = {
@@ -182,7 +187,10 @@ export default class Module {
 					const exportedName = specifier.exported.name;
 
 					if ( this.exports[ exportedName ] || this.reexports[ exportedName ] ) {
-						throw new Error( `A module cannot have multiple exports with the same name ('${exportedName}')` );
+						this.error({
+							code: 'DUPLICATE_EXPORT',
+							message: `A module cannot have multiple exports with the same name ('${exportedName}')`
+						}, specifier.start );
 					}
 
 					this.exports[ exportedName ] = { localName };

src/finalisers/iife.js

@@ -1,5 +1,6 @@
 import { blank } from '../utils/object.js';
 import { getName } from '../utils/map-helpers.js';
+import error from '../utils/error.js';
 import getInteropBlock from './shared/getInteropBlock.js';
 import getExportBlock from './shared/getExportBlock.js';
 import getGlobalNameMaker from './shared/getGlobalNameMaker.js';
@@ -36,7 +37,10 @@ export default function iife ( bundle, magicString, { exportMode, indentString,
 	const args = bundle.externalModules.map( getName );
 
 	if ( exportMode !== 'none' && !name ) {
-		throw new Error( 'You must supply options.moduleName for IIFE bundles' );
+		error({
+			code: 'INVALID_OPTION',
+			message: `You must supply options.moduleName for IIFE bundles`
+		});
 	}
 
 	if ( exportMode === 'named' ) {

src/finalisers/umd.js

@@ -1,5 +1,6 @@
 import { blank } from '../utils/object.js';
 import { getName, quotePath, req } from '../utils/map-helpers.js';
+import error from '../utils/error.js';
 import getInteropBlock from './shared/getInteropBlock.js';
 import getExportBlock from './shared/getExportBlock.js';
 import getGlobalNameMaker from './shared/getGlobalNameMaker.js';
@@ -28,7 +29,10 @@ const wrapperOutro = '\n\n})));';
 
 export default function umd ( bundle, magicString, { exportMode, indentString, intro, outro }, options ) {
 	if ( exportMode !== 'none' && !options.moduleName ) {
-		throw new Error( 'You must supply options.moduleName for UMD bundles' );
+		error({
+			code: 'INVALID_OPTION',
+			message: 'You must supply options.moduleName for UMD bundles'
+		});
 	}
 
 	warnOnBuiltins( bundle );

src/rollup.js

@@ -4,6 +4,7 @@ import { writeFile } from './utils/fs.js';
 import { assign, keys } from './utils/object.js';
 import { mapSequence } from './utils/promise.js';
 import validateKeys from './utils/validateKeys.js';
+import error from './utils/error.js';
 import { SOURCEMAPPING_URL } from './utils/sourceMappingURL.js';
 import Bundle from './Bundle.js';
 
@@ -50,15 +51,15 @@ function checkOptions ( options ) {
 		return new Error( 'The `transform`, `load`, `resolveId` and `resolveExternal` options are deprecated in favour of a unified plugin API. See https://github.com/rollup/rollup/wiki/Plugins for details' );
 	}
 
-	const error = validateKeys( keys(options), ALLOWED_KEYS );
-	if ( error ) return error;
+	const err = validateKeys( keys(options), ALLOWED_KEYS );
+	if ( err ) return err;
 
 	return null;
 }
 
 export function rollup ( options ) {
-	const error = checkOptions ( options );
-	if ( error ) return Promise.reject( error );
+	const err = checkOptions ( options );
+	if ( err ) return Promise.reject( err );
 
 	const bundle = new Bundle( options );
 
@@ -105,7 +106,10 @@ export function rollup ( options ) {
 			generate,
 			write: options => {
 				if ( !options || !options.dest ) {
-					throw new Error( 'You must supply options.dest to bundle.write' );
+					error({
+						code: 'MISSING_OPTION',
+						message: 'You must supply options.dest to bundle.write'
+					});
 				}
 
 				const dest = options.dest;

src/utils/collapseSourcemaps.js

@@ -1,4 +1,5 @@
 import { encode } from 'sourcemap-codec';
+import error from './error.js';
 import { dirname, relative, resolve } from './path.js';
 
 class Source {
@@ -51,7 +52,9 @@ class Link {
 					} else if ( sourcesContent[ sourceIndex ] == null ) {
 						sourcesContent[ sourceIndex ] = traced.source.content;
 					} else if ( traced.source.content != null && sourcesContent[ sourceIndex ] !== traced.source.content ) {
-						throw new Error( `Multiple conflicting contents for sourcemap source ${source.filename}` );
+						error({
+							message: `Multiple conflicting contents for sourcemap source ${source.filename}`
+						});
 					}
 
 					segment[1] = sourceIndex;

src/utils/defaults.js

@@ -1,6 +1,7 @@
 import { lstatSync, readdirSync, readFileSync, realpathSync } from './fs.js'; // eslint-disable-line
 import { basename, dirname, isAbsolute, resolve } from './path.js';
 import { blank } from './object.js';
+import error from './error.js';
 
 export function load ( id ) {
 	return readFileSync( id, 'utf-8' );
@@ -27,7 +28,13 @@ function addJsExtensionIfNecessary ( file ) {
 }
 
 export function resolveId ( importee, importer ) {
-	if ( typeof process === 'undefined' ) throw new Error( `It looks like you're using Rollup in a non-Node.js environment. This means you must supply a plugin with custom resolveId and load functions. See https://github.com/rollup/rollup/wiki/Plugins for more information` );
+	if ( typeof process === 'undefined' ) {
+		error({
+			code: 'MISSING_PROCESS',
+			message: `It looks like you're using Rollup in a non-Node.js environment. This means you must supply a plugin with custom resolveId and load functions`,
+			url: 'https://github.com/rollup/rollup/wiki/Plugins'
+		});
+	}
 
 	// absolute paths are left untouched
 	if ( isAbsolute( importee ) ) return addJsExtensionIfNecessary( resolve( importee ) );