Deconflict shared helpers with user imports

src/generators/Generator.js

@@ -213,7 +213,6 @@ export default class Generator {
 					while ( /[ \t]/.test( source[ a - 1 ] ) ) a -= 1;
 					while ( source[b] === '\n' ) b += 1;
 
-					//imports.push( source.slice( a, b ).replace( /^\s/, '' ) );
 					imports.push( node );
 					this.code.remove( a, b );
 				}

src/generators/dom/index.js

@@ -12,6 +12,11 @@ class DomGenerator extends Generator {
 		super( parsed, source, names, visitors );
 		this.renderers = [];
 		this.uses = {};
+
+		// allow compiler to deconflict user's `import { get } from 'whatever'` and
+		// Svelte's builtin `import { get, ... } from 'svelte/shared.js'`;
+		this.importedNames = {};
+		this.aliases = {};
 	}
 
 	addElement ( name, renderStatement, needsIdentifier = false ) {
@@ -23,13 +28,11 @@ class DomGenerator extends Generator {
 
 			this.createMountStatement( name );
 		} else {
-			this.uses.appendNode = true;
-			this.current.builders.init.addLine( `appendNode( ${renderStatement}, ${this.current.target} );` );
+			this.current.builders.init.addLine( `${this.helper( 'appendNode' )}( ${renderStatement}, ${this.current.target} );` );
 		}
 
 		if ( isToplevel ) {
-			this.uses.detachNode = true;
-			this.current.builders.detach.addLine( `detachNode( ${name} );` );
+			this.current.builders.detach.addLine( `${this.helper( 'detachNode' )}( ${name} );` );
 		}
 	}
 
@@ -55,8 +58,7 @@ class DomGenerator extends Generator {
 		if ( fragment.key ) properties.addBlock( `key: key,` );
 
 		if ( fragment.builders.mount.isEmpty() ) {
-			this.uses.noop = true;
-			properties.addBlock( `mount: noop,` );
+			properties.addBlock( `mount: ${this.helper( 'noop' )},` );
 		} else {
 			properties.addBlock( deindent`
 				mount: function ( target, anchor ) {
@@ -66,8 +68,7 @@ class DomGenerator extends Generator {
 		}
 
 		if ( fragment.builders.update.isEmpty() ) {
-			this.uses.noop = true;
-			properties.addBlock( `update: noop,` );
+			properties.addBlock( `update: ${this.helper( 'noop' )},` );
 		} else {
 			properties.addBlock( deindent`
 				update: function ( changed, ${fragment.params} ) {
@@ -79,8 +80,7 @@ class DomGenerator extends Generator {
 		}
 
 		if ( fragment.builders.teardown.isEmpty() ) {
-			this.uses.noop = true;
-			properties.addBlock( `teardown: noop,` );
+			properties.addBlock( `teardown: ${this.helper( 'noop' )},` );
 		} else {
 			properties.addBlock( deindent`
 				teardown: function ( detach ) {
@@ -101,18 +101,15 @@ class DomGenerator extends Generator {
 	}
 
 	createAnchor ( name ) {
-		this.uses.createComment = true;
-		const renderStatement = `createComment()`;
+		const renderStatement = `${this.helper( 'createComment' )}()`;
 		this.addElement( name, renderStatement, true );
 	}
 
 	createMountStatement ( name ) {
 		if ( this.current.target === 'target' ) {
-			this.uses.insertNode = true;
-			this.current.builders.mount.addLine( `insertNode( ${name}, target, anchor );` );
+			this.current.builders.mount.addLine( `${this.helper( 'insertNode' )}( ${name}, target, anchor );` );
 		} else {
-			this.uses.appendNode = true;
-			this.current.builders.init.addLine( `appendNode( ${name}, ${this.current.target} );` );
+			this.current.builders.init.addLine( `${this.helper( 'appendNode' )}( ${name}, ${this.current.target} );` );
 		}
 	}
 
@@ -133,6 +130,22 @@ class DomGenerator extends Generator {
 		// unset the children, to avoid them being visited again
 		node.children = [];
 	}
+
+	helper ( name ) {
+		this.uses[ name ] = true;
+
+		if ( !( name in this.aliases ) ) {
+			let alias = name;
+			let i = 1;
+			while ( alias in this.importedNames ) {
+				alias = `${name}$${i++}`;
+			}
+
+			this.aliases[ name ] = alias;
+		}
+
+		return this.aliases[ name ];
+	}
 }
 
 export default function dom ( parsed, source, options, names ) {
@@ -143,6 +156,12 @@ export default function dom ( parsed, source, options, names ) {
 
 	const { computations, templateProperties } = generator.parseJs();
 
+	generator.imports.forEach( node => {
+		node.specifiers.forEach( specifier => {
+			generator.importedNames[ specifier.local.name ] = true;
+		});
+	});
+
 	let namespace = null;
 	if ( templateProperties.namespace ) {
 		const ns = templateProperties.namespace.value;
@@ -214,15 +233,12 @@ export default function dom ( parsed, source, options, names ) {
 	}
 
 	if ( parsed.css && options.css !== false ) {
-		generator.uses.appendNode = true;
-		generator.uses.createElement = true;
-
 		builders.main.addBlock( deindent`
 			let addedCss = false;
 			function addCss () {
-				var style = createElement( 'style' );
+				var style = ${generator.helper( 'createElement' )}( 'style' );
 				style.textContent = ${JSON.stringify( processCss( parsed, generator.code ) )};
-				appendNode( style, document.head );
+				${generator.helper( 'appendNode' )}( style, document.head );
 
 				addedCss = true;
 			}
@@ -305,12 +321,12 @@ export default function dom ( parsed, source, options, names ) {
 
 	builders.main.addBlock( sharedPath ?
 		deindent`
-			${name}.prototype.get = get;
-			${name}.prototype.fire = fire;
-			${name}.prototype.observe = observe;
-			${name}.prototype.on = on;
-			${name}.prototype.set = set;
-			${name}.prototype._flush = _flush;
+			${name}.prototype.get = ${generator.helper( 'get' )};
+			${name}.prototype.fire = ${generator.helper( 'fire' )};
+			${name}.prototype.observe = ${generator.helper( 'observe' )};
+			${name}.prototype.on = ${generator.helper( 'on' )};
+			${name}.prototype.set = ${generator.helper( 'set' )};
+			${name}.prototype._flush = ${generator.helper( '_flush' )};
 		` :
 		deindent`
 			${name}.prototype.get = ${shared.get};
@@ -347,7 +363,9 @@ export default function dom ( parsed, source, options, names ) {
 			throw new Error( `Components with shared helpers must be compiled to ES2015 modules (format: 'es')` );
 		}
 
-		const names = [ 'get', 'fire', 'observe', 'on', 'set', '_flush', 'dispatchObservers' ].concat( Object.keys( generator.uses ) );
+		const names = [ 'get', 'fire', 'observe', 'on', 'set', '_flush', 'dispatchObservers' ].concat( Object.keys( generator.uses ) )
+			.map( name => name in generator.aliases ? `${name} as ${generator.aliases[ name ]}` : name );
+
 		builders.main.addLineAtStart(
 			`import { ${names.join( ', ' )} } from ${JSON.stringify( sharedPath )}`
 		);

src/generators/dom/visitors/EachBlock.js

@@ -151,9 +151,8 @@ export default {
 			` );
 		}
 
-		generator.uses.teardownEach = true;
 		generator.current.builders.teardown.addBlock(
-			`teardownEach( ${iterations}, ${isToplevel ? 'detach' : 'false'} );` );
+			`${generator.helper( 'teardownEach' )}( ${iterations}, ${isToplevel ? 'detach' : 'false'} );` );
 
 		if ( node.else ) {
 			generator.current.builders.teardown.addBlock( deindent`

src/generators/dom/visitors/Element.js

@@ -61,25 +61,21 @@ export default {
 
 		if ( local.namespace ) {
 			if ( local.namespace === 'http://www.w3.org/2000/svg' ) {
-				generator.uses.createSvgElement = true;
-				render = `var ${name} = createSvgElement( '${node.name}' )`;
+				render = `var ${name} = ${generator.helper( 'createSvgElement' )}( '${node.name}' )`;
 			} else {
 				render = `var ${name} = document.createElementNS( '${local.namespace}', '${node.name}' );`;
 			}
 		} else {
-			generator.uses.createElement = true;
-			render = `var ${name} = createElement( '${node.name}' );`;
+			render = `var ${name} = ${generator.helper( 'createElement' )}( '${node.name}' );`;
 		}
 
 		if ( generator.cssId && !generator.elementDepth ) {
-			generator.uses.setAttribute = true;
-			render += `\nsetAttribute( ${name}, '${generator.cssId}', '' );`;
+			render += `\n${generator.helper( 'setAttribute' )}( ${name}, '${generator.cssId}', '' );`;
 		}
 
 		local.init.addLineAtStart( render );
 		if ( isToplevel ) {
-			generator.uses.detachNode = true;
-			generator.current.builders.detach.addLine( `detachNode( ${name} );` );
+			generator.current.builders.detach.addLine( `${generator.helper( 'detachNode' )}( ${name} );` );
 		}
 
 		// special case – bound <option> without a value attribute

src/generators/dom/visitors/MustacheTag.js

@@ -8,8 +8,7 @@ export default {
 		const { snippet } = generator.contextualise( node.expression );
 
 		generator.current.builders.init.addLine( `var last_${name} = ${snippet}` );
-		generator.addElement( name, `createText( last_${name} )`, true );
-		generator.uses.createText = true;
+		generator.addElement( name, `${generator.helper( 'createText' )}( last_${name} )`, true );
 
 		generator.current.builders.update.addBlock( deindent`
 			if ( ( __tmp = ${snippet} ) !== last_${name} ) {

src/generators/dom/visitors/RawMustacheTag.js

@@ -9,20 +9,17 @@ export default {
 
 		// we would have used comments here, but the `insertAdjacentHTML` api only
 		// exists for `Element`s.
-		generator.uses.createElement = true;
-
 		const before = `${name}_before`;
-		generator.addElement( before, `createElement( 'noscript' )`, true );
+		generator.addElement( before, `${generator.helper( 'createElement' )}( 'noscript' )`, true );
 
 		const after = `${name}_after`;
-		generator.addElement( after, `createElement( 'noscript' )`, true );
+		generator.addElement( after, `${generator.helper( 'createElement' )}( 'noscript' )`, true );
 
 		const isToplevel = generator.current.localElementDepth === 0;
 
 		generator.current.builders.init.addLine( `var last_${name} = ${snippet};` );
 		const mountStatement = `${before}.insertAdjacentHTML( 'afterend', last_${name} );`;
-		generator.uses.detachBetween = true;
-		const detachStatement = `detachBetween( ${before}, ${after} );`;
+		const detachStatement = `${generator.helper( 'detachBetween' )}( ${before}, ${after} );`;
 
 		if ( isToplevel ) {
 			generator.current.builders.mount.addLine( mountStatement );

src/generators/dom/visitors/Text.js

@@ -5,8 +5,6 @@ export default {
 		}
 
 		const name = generator.current.getUniqueName( `text` );
-		generator.addElement( name, `createText( ${JSON.stringify( node.data )} )`, false );
-
-		generator.uses.createText = true;
+		generator.addElement( name, `${generator.helper( 'createText' )}( ${JSON.stringify( node.data )} )`, false );
 	}
 };

src/generators/dom/visitors/attributes/addElementAttributes.js

@@ -21,7 +21,7 @@ export default function addElementAttributes ( generator, node, local ) {
 			// xlink is a special case... we could maybe extend this to generic
 			// namespaced attributes but I'm not sure that's applicable in
 			// HTML5?
-			const helper = isXlink ? 'setXlinkAttribute' : 'setAttribute';
+			const method = isXlink ? 'setXlinkAttribute' : 'setAttribute';
 
 			if ( attribute.value === true ) {
 				// attributes without values, e.g. <textarea readonly>
@@ -30,9 +30,8 @@ export default function addElementAttributes ( generator, node, local ) {
 						`${local.name}.${propertyName} = true;`
 					);
 				} else {
-					generator.uses[ helper ] = true;
 					local.init.addLine(
-						`${helper}( ${local.name}, '${name}', true );`
+						`${generator.helper( method )}( ${local.name}, '${name}', true );`
 					);
 				}
 
@@ -48,9 +47,8 @@ export default function addElementAttributes ( generator, node, local ) {
 						`${local.name}.${propertyName} = '';`
 					);
 				} else {
-					generator.uses[ helper ] = true;
 					local.init.addLine(
-						`${helper}( ${local.name}, '${name}', '' );`
+						`${generator.helper( method )}( ${local.name}, '${name}', '' );`
 					);
 				}
 			}
@@ -79,9 +77,8 @@ export default function addElementAttributes ( generator, node, local ) {
 					}
 
 					if ( addAttribute ) {
-						generator.uses[ helper ] = true;
 						local.init.addLine(
-							`${helper}( ${local.name}, '${name}', ${result} );`
+							`${generator.helper( method )}( ${local.name}, '${name}', ${result} );`
 						);
 					}
 				}
@@ -99,8 +96,7 @@ export default function addElementAttributes ( generator, node, local ) {
 					if ( propertyName ) {
 						updater = `${local.name}.${propertyName} = ${last};`;
 					} else {
-						generator.uses[ helper ] = true;
-						updater = `${helper}( ${local.name}, '${name}', ${last} );`; // TODO use snippet both times – see note below
+						updater = `${generator.helper( method )}( ${local.name}, '${name}', ${last} );`; // TODO use snippet both times – see note below
 					}
 
 					local.init.addLine( updater );
@@ -133,8 +129,7 @@ export default function addElementAttributes ( generator, node, local ) {
 				if (propertyName) {
 					updater = `${local.name}.${propertyName} = ${value};`;
 				} else {
-					generator.uses[ helper ] = true;
-					updater = `${helper}( ${local.name}, '${name}', ${value} );`;
+					updater = `${generator.helper( method )}( ${local.name}, '${name}', ${value} );`;
 				}
 
 				local.init.addLine( updater );
@@ -194,18 +189,16 @@ export default function addElementAttributes ( generator, node, local ) {
 					${handlerName}.teardown();
 				` );
 			} else {
-				generator.uses.addEventListener = true;
-				generator.uses.removeEventListener = true;
 				local.init.addBlock( deindent`
 					function ${handlerName} ( event ) {
 						${handlerBody}
 					}
 
-					addEventListener( ${local.name}, '${name}', ${handlerName} );
+					${generator.helper( 'addEventListener' )}( ${local.name}, '${name}', ${handlerName} );
 				` );
 
 				generator.current.builders.teardown.addLine( deindent`
-					removeEventListener( ${local.name}, '${name}', ${handlerName} );
+					${generator.helper( 'removeEventListener' )}( ${local.name}, '${name}', ${handlerName} );
 				` );
 			}
 		}

src/generators/dom/visitors/attributes/binding/index.js

@@ -138,8 +138,6 @@ export default function createBinding ( generator, node, attribute, current, loc
 			updateElement = `${local.name}.${attribute.name} = ${contextual ? attribute.value : `root.${attribute.value}`};`;
 		}
 
-		generator.uses.addEventListener = true;
-		generator.uses.removeEventListener = true;
 		local.init.addBlock( deindent`
 			var ${local.name}_updating = false;
 
@@ -149,7 +147,7 @@ export default function createBinding ( generator, node, attribute, current, loc
 				${local.name}_updating = false;
 			}
 
-			addEventListener( ${local.name}, '${eventName}', ${handler} );
+			${generator.helper( 'addEventListener' )}( ${local.name}, '${eventName}', ${handler} );
 		` );
 
 		node.initialUpdate = updateElement;
@@ -159,7 +157,7 @@ export default function createBinding ( generator, node, attribute, current, loc
 		);
 
 		generator.current.builders.teardown.addLine( deindent`
-			removeEventListener( ${local.name}, '${eventName}', ${handler} );
+			${generator.helper( 'removeEventListener' )}( ${local.name}, '${eventName}', ${handler} );
 		` );
 	}
 }

test/generate.js

@@ -44,7 +44,7 @@ describe( 'generate', () => {
 
 			try {
 				const source = fs.readFileSync( `test/generator/${dir}/main.html`, 'utf-8' );
-				compiled = svelte.compile( source );
+				compiled = svelte.compile( source, compileOptions );
 			} catch ( err ) {
 				if ( config.compileError ) {
 					config.compileError( err );

test/generator/deconflict-builtins/_config.js

@@ -0,0 +1,8 @@
+export default {
+	html: `<span>got</span>`,
+
+	test ( assert, component ) {
+		assert.equal( component.get( 'foo' ), 'got' );
+		component.teardown();
+	}
+};

test/generator/deconflict-builtins/get.js

@@ -0,0 +1,3 @@
+export default function get () {
+	return 'got';
+}