rename root to state, and allow state to be used as context

src/generators/Generator.js

@@ -102,7 +102,7 @@ export default class Generator {
 					else if ( contexts.has( name ) ) {
 						const contextName = contexts.get( name );
 						if ( contextName !== name ) {
-							// this is true for 'reserved' names like `root` and `component`
+							// this is true for 'reserved' names like `state` and `component`
 							code.overwrite( node.start, node.start + name.length, contextName, true );
 						}
 
@@ -124,13 +124,13 @@ export default class Generator {
 						}
 
 						if ( globalWhitelist.has( name ) ) {
-							code.prependRight( node.start, `( '${name}' in root ? root.` );
+							code.prependRight( node.start, `( '${name}' in state ? state.` );
 							code.appendLeft( node.object ? node.object.end : node.end, ` : ${name} )` );
 						} else {
-							code.prependRight( node.start, `root.` );
+							code.prependRight( node.start, `state.` );
 						}
 
-						if ( !~usedContexts.indexOf( 'root' ) ) usedContexts.push( 'root' );
+						if ( !~usedContexts.indexOf( 'state' ) ) usedContexts.push( 'state' );
 					}
 
 					this.skip();

src/generators/dom/preprocess.js

@@ -191,7 +191,7 @@ export default function preprocess ( generator, node ) {
 		indexes: new Map(),
 		contextDependencies: new Map(),
 
-		params: [ 'root' ],
+		params: [ 'state' ],
 		indexNames: new Map(),
 		listNames: new Map(),
 

src/generators/dom/visitors/Component/Binding.js

@@ -24,7 +24,7 @@ export default function visitBinding ( generator, block, state, node, attribute,
 		prop = `'[✂${attribute.value.property.start}-${attribute.value.property.end}✂]'`;
 		obj = `[✂${attribute.value.object.start}-${attribute.value.object.end}✂]`;
 	} else {
-		obj = 'root';
+		obj = 'state';
 		prop = `'${name}'`;
 	}
 

src/generators/dom/visitors/Component/Component.js

@@ -66,7 +66,7 @@ export default function visitComponent ( generator, block, state, node ) {
 
 	if ( local.allUsedContexts.length ) {
 		const initialProps = local.allUsedContexts.map( contextName => {
-			if ( contextName === 'root' ) return `root: root`;
+			if ( contextName === 'state' ) return `state: state`;
 
 			const listName = block.listNames.get( contextName );
 			const indexName = block.indexNames.get( contextName );
@@ -75,7 +75,7 @@ export default function visitComponent ( generator, block, state, node ) {
 		}).join( ',\n' );
 
 		const updates = local.allUsedContexts.map( contextName => {
-			if ( contextName === 'root' ) return `${name}._context.root = root;`;
+			if ( contextName === 'state' ) return `${name}._context.state = state;`;
 
 			const listName = block.listNames.get( contextName );
 			const indexName = block.indexNames.get( contextName );

src/generators/dom/visitors/Component/EventHandler.js

@@ -17,7 +17,7 @@ export default function visitEventHandler ( generator, block, state, node, attri
 
 	// TODO hoist event handlers? can do `this.__component.method(...)`
 	const declarations = usedContexts.map( name => {
-		if ( name === 'root' ) return 'var root = this._context.root;';
+		if ( name === 'state' ) return 'var state = this._context.state;';
 
 		const listName = block.listNames.get( name );
 		const indexName = block.indexNames.get( name );

src/generators/dom/visitors/Element/Element.js

@@ -86,7 +86,7 @@ export default function visitElement ( generator, block, state, node ) {
 		}
 
 		childState.allUsedContexts.forEach( contextName => {
-			if ( contextName === 'root' ) return;
+			if ( contextName === 'state' ) return;
 
 			const listName = block.listNames.get( contextName );
 			const indexName = block.indexNames.get( contextName );

src/generators/dom/visitors/Element/EventHandler.js

@@ -30,9 +30,9 @@ export default function visitEventHandler ( generator, block, state, node, attri
 
 	const _this = context || 'this';
 	const declarations = usedContexts.map( name => {
-		if ( name === 'root' ) {
+		if ( name === 'state' ) {
 			if ( shouldHoist ) state.usesComponent = true;
-			return `var root = ${block.component}.get();`;
+			return `var state = ${block.component}.get();`;
 		}
 
 		const listName = block.listNames.get( name );

src/generators/dom/visitors/Element/meta/Window.js

@@ -43,7 +43,7 @@ export default function visitWindow ( generator, block, node ) {
 			}
 
 			const handlerName = block.getUniqueName( `onwindow${attribute.name}` );
-			const handlerBody = ( usesState ? `var root = ${block.component}.get();\n` : '' ) +
+			const handlerBody = ( usesState ? `var state = ${block.component}.get();\n` : '' ) +
 				`[✂${attribute.expression.start}-${attribute.expression.end}✂];`;
 
 			block.builders.create.addBlock( deindent`

src/generators/server-side-rendering/Block.js

@@ -7,7 +7,7 @@ export default class Block {
 	}
 
 	addBinding ( binding, name ) {
-		const conditions = [ `!( '${binding.name}' in root )`].concat( // TODO handle contextual bindings...
+		const conditions = [ `!( '${binding.name}' in state )`].concat( // TODO handle contextual bindings...
 			this.conditions.map( c => `(${c})` )
 		);
 
@@ -17,7 +17,7 @@ export default class Block {
 			if ( ${conditions.join( '&&' )} ) {
 				tmp = ${name}.data();
 				if ( '${keypath}' in tmp ) {
-					root.${binding.name} = tmp.${keypath};
+					state.${binding.name} = tmp.${keypath};
 					settled = false;
 				}
 			}

src/generators/server-side-rendering/index.js

@@ -44,12 +44,12 @@ export default function ssr ( parsed, source, options ) {
 	});
 
 	builders.render.addLine(
-		templateProperties.data ? `root = Object.assign( ${generator.alias( 'template' )}.data(), root || {} );` : `root = root || {};`
+		templateProperties.data ? `state = Object.assign( ${generator.alias( 'template' )}.data(), state || {} );` : `state = state || {};`
 	);
 
 	computations.forEach( ({ key, deps }) => {
 		builders.render.addLine(
-			`root.${key} = ${generator.alias( 'template' )}.computed.${key}( ${deps.map( dep => `root.${dep}` ).join( ', ' )} );`
+			`state.${key} = ${generator.alias( 'template' )}.computed.${key}( ${deps.map( dep => `state.${dep}` ).join( ', ' )} );`
 		);
 	});
 
@@ -129,7 +129,7 @@ export default function ssr ( parsed, source, options ) {
 			return ${templateProperties.data ? `${generator.alias( 'template' )}.data()` : `{}`};
 		};
 
-		${name}.render = function ( root, options ) {
+		${name}.render = function ( state, options ) {
 			${builders.render}
 		};
 

src/generators/server-side-rendering/visitors/Component.js

@@ -45,7 +45,7 @@ export default function visitComponent ( generator, block, node ) {
 		})
 		.concat( bindings.map( binding => {
 			const { name, keypath } = flattenReference( binding.value );
-			const value = block.contexts.has( name ) ? keypath : `root.${keypath}`;
+			const value = block.contexts.has( name ) ? keypath : `state.${keypath}`;
 			return `${binding.name}: ${value}`;
 		}))
 		.join( ', ' );

src/utils/reservedNames.js

@@ -1 +1,6 @@
-export default new Set( [ 'arguments', 'await', 'break', 'case', 'catch', 'class', 'const', 'continue', 'debugger', 'default', 'delete', 'do', 'else', 'enum', 'eval', 'export', 'extends', 'false', 'finally', 'for', 'function', 'if', 'implements', 'import', 'in', 'instanceof', 'interface', 'let', 'new', 'null', 'package', 'private', 'protected', 'public', 'return', 'static', 'super', 'switch', 'this', 'throw', 'true', 'try', 'typeof', 'var', 'void', 'while', 'with', 'yield' ] );
+const reservedNames = new Set( [ 'arguments', 'await', 'break', 'case', 'catch', 'class', 'const', 'continue', 'debugger', 'default', 'delete', 'do', 'else', 'enum', 'eval', 'export', 'extends', 'false', 'finally', 'for', 'function', 'if', 'implements', 'import', 'in', 'instanceof', 'interface', 'let', 'new', 'null', 'package', 'private', 'protected', 'public', 'return', 'static', 'super', 'switch', 'this', 'throw', 'true', 'try', 'typeof', 'var', 'void', 'while', 'with', 'yield' ] );
+
+// prevent e.g. `{{#each states as state}}` breaking
+reservedNames.add( 'state' );
+
+export default reservedNames;

src/validate/js/index.js

@@ -63,14 +63,6 @@ export default function validateJs ( validator, js ) {
 
 			validator.defaultExport = node;
 		}
-
-		if ( node.type === 'ImportDeclaration' ) {
-			node.specifiers.forEach( specifier => {
-				if ( specifier.local.name === 'root' ) {
-					validator.error( `Imported identifiers cannot have a name of 'root' due to technical limitations`, specifier.start );
-				}
-			});
-		}
 	});
 
 	[ 'components', 'methods', 'helpers' ].forEach( key => {

src/validate/js/propValidators/components.js

@@ -11,6 +11,10 @@ export default function components ( validator, prop ) {
 	checkForComputedKeys( validator, prop.value.properties );
 
 	prop.value.properties.forEach( component => {
+		if ( component.key.name === 'state' ) {
+			validator.error( `Component constructors cannot be called 'state' due to technical limitations`, component.start );
+		}
+
 		if ( !/^[A-Z]/.test( component.key.name ) ) {
 			validator.warn( `Component names should be capitalised`, component.start );
 		}

test/js/samples/collapses-text-around-comments/expected.js

@@ -17,10 +17,10 @@ function add_css () {
 	added_css = true;
 }
 
-function create_main_fragment ( root, component ) {
+function create_main_fragment ( state, component ) {
 	var p = createElement( 'p' );
 	setAttribute( p, 'svelte-3842350206', '' );
-	var text_value = root.foo;
+	var text_value = state.foo;
 	var text = createText( text_value );
 	appendNode( text, p );
 
@@ -29,8 +29,8 @@ function create_main_fragment ( root, component ) {
 			insertNode( p, target, anchor );
 		},
 
-		update: function ( changed, root ) {
-			if ( text_value !== ( text_value = root.foo ) ) {
+		update: function ( changed, state ) {
+			if ( text_value !== ( text_value = state.foo ) ) {
 				text.data = text_value;
 			}
 		},

test/js/samples/computed-collapsed-if/expected.js

@@ -16,7 +16,7 @@ var template = (function () {
 	};
 }());
 
-function create_main_fragment ( root, component ) {
+function create_main_fragment ( state, component ) {
 
 
 	return {

test/js/samples/each-block-changed-check/expected.js

@@ -1,17 +1,17 @@
 import { appendNode, assign, createComment, createElement, createText, destroyEach, detachBetween, detachNode, dispatchObservers, insertNode, proto } from "svelte/shared.js";
 
-function create_main_fragment ( root, component ) {
+function create_main_fragment ( state, component ) {
 	var each_block_anchor = createComment();
-	var each_block_value = root.comments;
+	var each_block_value = state.comments;
 	var each_block_iterations = [];
 
 	for ( var i = 0; i < each_block_value.length; i += 1 ) {
-		each_block_iterations[i] = create_each_block( root, each_block_value, each_block_value[i], i, component );
+		each_block_iterations[i] = create_each_block( state, each_block_value, each_block_value[i], i, component );
 	}
 
 	var text = createText( "\n\n" );
 	var p = createElement( 'p' );
-	var text_1_value = root.foo;
+	var text_1_value = state.foo;
 	var text_1 = createText( text_1_value );
 	appendNode( text_1, p );
 
@@ -27,15 +27,15 @@ function create_main_fragment ( root, component ) {
 			insertNode( p, target, anchor );
 		},
 
-		update: function ( changed, root ) {
-			var each_block_value = root.comments;
+		update: function ( changed, state ) {
+			var each_block_value = state.comments;
 
 			if ( 'comments' in changed || 'elapsed' in changed || 'time' in changed ) {
 				for ( var i = 0; i < each_block_value.length; i += 1 ) {
 					if ( each_block_iterations[i] ) {
-						each_block_iterations[i].update( changed, root, each_block_value, each_block_value[i], i );
+						each_block_iterations[i].update( changed, state, each_block_value, each_block_value[i], i );
 					} else {
-						each_block_iterations[i] = create_each_block( root, each_block_value, each_block_value[i], i, component );
+						each_block_iterations[i] = create_each_block( state, each_block_value, each_block_value[i], i, component );
 						each_block_iterations[i].mount( each_block_anchor.parentNode, each_block_anchor );
 					}
 				}
@@ -45,7 +45,7 @@ function create_main_fragment ( root, component ) {
 				each_block_iterations.length = each_block_value.length;
 			}
 
-			if ( text_1_value !== ( text_1_value = root.foo ) ) {
+			if ( text_1_value !== ( text_1_value = state.foo ) ) {
 				text_1.data = text_1_value;
 			}
 		},
@@ -62,7 +62,7 @@ function create_main_fragment ( root, component ) {
 	};
 }
 
-function create_each_block ( root, each_block_value, comment, i, component ) {
+function create_each_block ( state, each_block_value, comment, i, component ) {
 	var div = createElement( 'div' );
 	div.className = "comment";
 	var strong = createElement( 'strong' );
@@ -78,7 +78,7 @@ function create_each_block ( root, each_block_value, comment, i, component ) {
 	var text_2 = createText( text_2_value );
 	appendNode( text_2, span );
 	appendNode( createText( " wrote " ), span );
-	var text_4_value = root.elapsed(comment.time, root.time);
+	var text_4_value = state.elapsed(comment.time, state.time);
 	var text_4 = createText( text_4_value );
 	appendNode( text_4, span );
 	appendNode( createText( " ago:" ), span );
@@ -95,7 +95,7 @@ function create_each_block ( root, each_block_value, comment, i, component ) {
 			insertNode( div, target, anchor );
 		},
 
-		update: function ( changed, root, each_block_value, comment, i ) {
+		update: function ( changed, state, each_block_value, comment, i ) {
 			if ( text_value !== ( text_value = i ) ) {
 				text.data = text_value;
 			}
@@ -104,7 +104,7 @@ function create_each_block ( root, each_block_value, comment, i, component ) {
 				text_2.data = text_2_value;
 			}
 
-			if ( text_4_value !== ( text_4_value = root.elapsed(comment.time, root.time) ) ) {
+			if ( text_4_value !== ( text_4_value = state.elapsed(comment.time, state.time) ) ) {
 				text_4.data = text_4_value;
 			}
 

test/js/samples/event-handlers-custom/expected.js

@@ -15,12 +15,12 @@ var template = (function () {
 	};
 }());
 
-function create_main_fragment ( root, component ) {
+function create_main_fragment ( state, component ) {
 	var button = createElement( 'button' );
 
 	var foo_handler = template.events.foo.call( component, button, function ( event ) {
-		var root = component.get();
-		component.foo( root.bar );
+		var state = component.get();
+		component.foo( state.bar );
 	});
 
 	appendNode( createText( "foo" ), button );

test/js/samples/if-block-no-update/expected.js

@@ -1,26 +1,26 @@
 import { appendNode, assign, createComment, createElement, createText, detachNode, dispatchObservers, insertNode, proto } from "svelte/shared.js";
 
-function create_main_fragment ( root, component ) {
+function create_main_fragment ( state, component ) {
 	var if_block_anchor = createComment();
 
-	function get_block ( root ) {
-		if ( root.foo ) return create_if_block;
+	function get_block ( state ) {
+		if ( state.foo ) return create_if_block;
 		return create_if_block_1;
 	}
 
-	var current_block = get_block( root );
-	var if_block = current_block && current_block( root, component );
+	var current_block = get_block( state );
+	var if_block = current_block && current_block( state, component );
 
 	return {
 		mount: function ( target, anchor ) {
 			insertNode( if_block_anchor, target, anchor );
 			if ( if_block ) if_block.mount( target, if_block_anchor );
 		},
 
-		update: function ( changed, root ) {
-			if ( current_block !== ( current_block = get_block( root ) ) ) {
+		update: function ( changed, state ) {
+			if ( current_block !== ( current_block = get_block( state ) ) ) {
 				if ( if_block ) if_block.destroy( true );
-				if_block = current_block && current_block( root, component );
+				if_block = current_block && current_block( state, component );
 				if ( if_block ) if_block.mount( if_block_anchor.parentNode, if_block_anchor );
 			}
 		},
@@ -35,7 +35,7 @@ function create_main_fragment ( root, component ) {
 	};
 }
 
-function create_if_block ( root, component ) {
+function create_if_block ( state, component ) {
 	var p = createElement( 'p' );
 	appendNode( createText( "foo!" ), p );
 
@@ -52,7 +52,7 @@ function create_if_block ( root, component ) {
 	};
 }
 
-function create_if_block_1 ( root, component ) {
+function create_if_block_1 ( state, component ) {
 	var p = createElement( 'p' );
 	appendNode( createText( "not foo!" ), p );