Counter • Playground • Svelte

App.svelte

let count = 0;

const increment = () => {

count += 1;

};

</script>

Count is {count}

</button>

import 'svelte/internal/disclose-version';

import 'svelte/internal/flags/legacy';

import * as $ from 'svelte/internal/client';

var root = $.template(`<button class="button"> </button>`);

export default function App($$anchor) {

let count = $.mutable_state(0);

const increment = () => {

$.set(count, $.get(count) + 1);

};

var button = root();

var text = $.child(button);

$.reset(button);

$.template_effect(() => $.set_text(text, `Count is ${$.get(count) ?? ''}`));

$.event('click', button, increment);

$.append($$anchor, button);

}

result = svelte.compile(source, {

generate: "client" "server",

dev: false });

/* Add a <style> tag to see the CSS output */

		
			
				
					 Root {
 css: null
js: []
start: 88
end: 161
type: "Root"
fragment: Fragment {...}
 type: "Fragment"
nodes: [...] (2)
  Text {...}
 type: "Text"
start: 86
end: 88
raw: "\n\n"
data: "\n\n"
 }
 RegularElement {...}
 type: "RegularElement"
start: 88
end: 161
name: "button"
attributes: [...] (2)
  Attribute {...}
 type: "Attribute"
start: 96
end: 110
name: "class"
value: [...] (1)
  Text {...}
 start: 103
end: 109
type: "Text"
raw: "button"
data: "button"
 }
 ]
 }
 OnDirective {...}
 start: 111
end: 131
type: "OnDirective"
name: "click"
expression: Identifier {...}
 type: "Identifier"
start: 121
end: 130
loc:  {...}
 start:  {...}
 line: 9
column: 33
 }
end:  {...}
 line: 9
column: 42
 }
 }
name: "increment"
 }
modifiers: []
 }
 ]
fragment: Fragment {...}
 type: "Fragment"
nodes: [...] (3)
  Text {...}
 type: "Text"
start: 132
end: 144
raw: "Count is "
data: "Count is "
 }
 ExpressionTag {...}
 type: "ExpressionTag"
start: 144
end: 151
expression: Identifier {...}
 type: "Identifier"
start: 145
end: 150
loc:  {...}
 start:  {...}
 line: 10
column: 12
 }
end:  {...}
 line: 10
column: 17
 }
 }
name: "count"
 }
 }
 Text {...}
 type: "Text"
start: 151
end: 152
raw: "\n"
data: "\n"
 }
 ]
 }
 }
 ]
 }
options: null
instance: Script {...}
 type: "Script"
start: 0
end: 86
context: "default"
content: Program {...}
 type: "Program"
start: 8
end: 77
loc:  {...}
 start:  {...}
 line: 1
column: 0
 }
end:  {...}
 line: 7
column: 0
 }
 }
body: [...] (2)
  VariableDeclaration {...}
 type: "VariableDeclaration"
start: 11
end: 25
loc:  {...}
 start:  {...}
 line: 2
column: 2
 }
end:  {...}
 line: 2
column: 16
 }
 }
declarations: [...] (1)
  VariableDeclarator {...}
 type: "VariableDeclarator"
start: 15
end: 24
loc:  {...}
 start:  {...}
 line: 2
column: 6
 }
end:  {...}
 line: 2
column: 15
 }
 }
id: Identifier {...}
 type: "Identifier"
start: 15
end: 20
loc:  {...}
 start:  {...}
 line: 2
column: 6
 }
end:  {...}
 line: 2
column: 11
 }
 }
name: "count"
 }
init: Literal {...}
 type: "Literal"
start: 23
end: 24
loc:  {...}
 start:  {...}
 line: 2
column: 14
 }
end:  {...}
 line: 2
column: 15
 }
 }
value: 0
raw: "0"
 }
 }
 ]
kind: "let"
 }
 VariableDeclaration {...}
 type: "VariableDeclaration"
start: 30
end: 76
loc:  {...}
 start:  {...}
 line: 4
column: 2
 }
end:  {...}
 line: 6
column: 4
 }
 }
declarations: [...] (1)
  VariableDeclarator {...}
 type: "VariableDeclarator"
start: 36
end: 75
loc:  {...}
 start:  {...}
 line: 4
column: 8
 }
end:  {...}
 line: 6
column: 3
 }
 }
id: Identifier {...}
 type: "Identifier"
start: 36
end: 45
loc:  {...}
 start:  {...}
 line: 4
column: 8
 }
end:  {...}
 line: 4
column: 17
 }
 }
name: "increment"
 }
init: ArrowFunctionExpression {...}
 type: "ArrowFunctionExpression"
start: 48
end: 75
loc:  {...}
 start:  {...}
 line: 4
column: 20
 }
end:  {...}
 line: 6
column: 3
 }
 }
id: null
expression: false
generator: false
async: false
params: []
body: BlockStatement {...}
 type: "BlockStatement"
start: 54
end: 75
loc:  {...}
 start:  {...}
 line: 4
column: 26
 }
end:  {...}
 line: 6
column: 3
 }
 }
body: [...] (1)
  ExpressionStatement {...}
 type: "ExpressionStatement"
start: 60
end: 71
loc:  {...}
 start:  {...}
 line: 5
column: 4
 }
end:  {...}
 line: 5
column: 15
 }
 }
expression: AssignmentExpression {...}
 type: "AssignmentExpression"
start: 60
end: 70
loc:  {...}
 start:  {...}
 line: 5
column: 4
 }
end:  {...}
 line: 5
column: 14
 }
 }
operator: "+="
left: Identifier {...}
 type: "Identifier"
start: 60
end: 65
loc:  {...}
 start:  {...}
 line: 5
column: 4
 }
end:  {...}
 line: 5
column: 9
 }
 }
name: "count"
 }
right: Literal {...}
 type: "Literal"
start: 69
end: 70
loc:  {...}
 start:  {...}
 line: 5
column: 13
 }
end:  {...}
 line: 5
column: 14
 }
 }
value: 1
raw: "1"
 }
 }
 }
 ]
 }
 }
 }
 ]
kind: "const"
 }
 ]
sourceType: "module"
 }
attributes: []
 }
 }

The AST is not public API and may change at any point in time

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