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App.svelte
utils.js
<script>
import { transitionHelper } from './utils.js';
import { tick } from 'svelte';
let count = 0;
function incrementClick() {
transitionHelper({
async updateDOM() {
count++;
await tick();
}
});
}
</script>

<button on:click={incrementClick}>Increment</button>
<div class="count">{count}</div>

<style>
:global(html) {
background: black;
}
:global(body) {
color: #fff;
}

.count {
font-family: sans-serif;
text-align: center;
position: absolute;
inset: 50% 0 auto;
transform: translateY(-50%);
font-size: 25vw;
view-transition-name: count;
import 'svelte/internal/disclose-version';
import 'svelte/internal/flags/legacy';
import * as $ from 'svelte/internal/client';
import { transitionHelper } from './utils.js';
import { tick } from 'svelte';

var root = $.template(`<button>Increment</button> <div class="count svelte-182zsq2"> </div>`, 1);

export default function App($$anchor, $$props) {
$.push($$props, false);

let count = $.mutable_state(0);

function incrementClick() {
transitionHelper({
async updateDOM() {
$.update(count);
await tick();
}
});
}

$.init();

var fragment = root();
var button = $.first_child(fragment);
var div = $.sibling(button, 2);
var text = $.child(div, true);

$.reset(div);
$.template_effect(() => $.set_text(text, $.get(count)));
$.event('click', button, incrementClick);
$.append($$anchor, fragment);
$.pop();
}
result = svelte.compile(source, {
generate: ,
});

html {
background: black;
}
body {
color: #fff;
}

.count.svelte-182zsq2 {
font-family: sans-serif;
text-align: center;
position: absolute;
inset: 50% 0 auto;
transform: translateY(-50%);
font-size: 25vw;
view-transition-name: count;
/* This won't be required soon. In fact, it already works without this in Canary */
contain: layout;
}

/* Custom transition */
@keyframes svelte-182zsq2-rotate-out {
to {
transform: rotate(90deg);
}
}

@keyframes svelte-182zsq2-rotate-in {
from {
transform: rotate(-90deg);
}
}

html::view-transition-old(count),
html::view-transition-new(count) {
		
			
				
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                  }
                • local: Identifier {...}
                  • type: "Identifier"
                  • start: 67
                  • end: 71
                  • loc: {...}
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                      • column: 10
                      }
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                      • line: 3
                      • column: 14
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                  • name: "tick"
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                }
              ]
            • source: Literal {...}
              • type: "Literal"
              • start: 79
              • end: 87
              • loc: {...}
                • start: {...}
                  • line: 3
                  • column: 22
                  }
                • end: {...}
                  • line: 3
                  • column: 30
                  }
                }
              • value: "svelte"
              • raw: "'svelte'"
              }
            }
          • VariableDeclaration {...}
            • type: "VariableDeclaration"
            • start: 92
            • end: 106
            • loc: {...}
              • start: {...}
                • line: 5
                • column: 1
                }
              • end: {...}
                • line: 5
                • column: 15
                }
              }
            • declarations: [...] (1)
              • VariableDeclarator {...}
                • type: "VariableDeclarator"
                • start: 96
                • end: 105
                • loc: {...}
                  • start: {...}
                    • line: 5
                    • column: 5
                    }
                  • end: {...}
                    • line: 5
                    • column: 14
                    }
                  }
                • id: Identifier {...}
                  • type: "Identifier"
                  • start: 96
                  • end: 101
                  • loc: {...}
                    • start: {...}
                      • line: 5
                      • column: 5
                      }
                    • end: {...}
                      • line: 5
                      • column: 10
                      }
                    }
                  • name: "count"
                  }
                • init: Literal {...}
                  • type: "Literal"
                  • start: 104
                  • end: 105
                  • loc: {...}
                    • start: {...}
                      • line: 5
                      • column: 13
                      }
                    • end: {...}
                      • line: 5
                      • column: 14
                      }
                    }
                  • value: 0
                  • raw: "0"
                  }
                }
              ]
            • kind: "let"
            }
          • FunctionDeclaration {...}
            • type: "FunctionDeclaration"
            • start: 110
            • end: 226
            • loc: {...}
              • start: {...}
                • line: 7
                • column: 1
                }
              • end: {...}
                • line: 14
                • column: 2
                }
              }
            • id: Identifier {...}
              • type: "Identifier"
              • start: 119
              • end: 133
              • loc: {...}
                • start: {...}
                  • line: 7
                  • column: 10
                  }
                • end: {...}
                  • line: 7
                  • column: 24
                  }
                }
              • name: "incrementClick"
              }
            • expression: false
            • generator: false
            • async: false
            • params: []
            • body: BlockStatement {...}
              • type: "BlockStatement"
              • start: 136
              • end: 226
              • loc: {...}
                • start: {...}
                  • line: 7
                  • column: 27
                  }
                • end: {...}
                  • line: 14
                  • column: 2
                  }
                }
              • body: [...] (1)
                • ExpressionStatement {...}
                  • type: "ExpressionStatement"
                  • start: 140
                  • end: 223
                  • loc: {...}
                    • start: {...}
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                      • column: 2
                      }
                    • end: {...}
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                      • column: 5
                      }
                    }
                  • expression: CallExpression {...}
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                    • start: 140
                    • end: 222
                    • loc: {...}
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                        • column: 2
                        }
                      • end: {...}
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                        • column: 4
                        }
                      }
                    • callee: Identifier {...}
                      • type: "Identifier"
                      • start: 140
                      • end: 156
                      • loc: {...}
                        • start: {...}
                          • line: 8
                          • column: 2
                          }
                        • end: {...}
                          • line: 8
                          • column: 18
                          }
                        }
                      • name: "transitionHelper"
                      }
                    • arguments: [...] (1)
                      • ObjectExpression {...}
                        • type: "ObjectExpression"
                        • start: 157
                        • end: 221
                        • loc: {...}
                          • start: {...}
                            • line: 8
                            • column: 19
                            }
                          • end: {...}
                            • line: 13
                            • column: 3
                            }
                          }
                        • properties: [...] (1)
                          • Property {...}
                            • type: "Property"
                            • start: 162
                            • end: 217
                            • loc: {...}
                              • start: {...}
                                • line: 9
                                • column: 3
                                }
                              • end: {...}
                                • line: 12
                                • column: 4
                                }
                              }
                            • method: true
                            • shorthand: false
                            • computed: false
                            • key: Identifier {...}
                              • type: "Identifier"
                              • start: 168
                              • end: 177
                              • loc: {...}
                                • start: {...}
                                  • line: 9
                                  • column: 9
                                  }
                                • end: {...}
                                  • line: 9
                                  • column: 18
                                  }
                                }
                              • name: "updateDOM"
                              }
                            • kind: "init"
                            • value: FunctionExpression {...}
                              • type: "FunctionExpression"
                              • start: 177
                              • end: 217
                              • loc: {...}
                                • start: {...}
                                  • line: 9
                                  • column: 18
                                  }
                                • end: {...}
                                  • line: 12
                                  • column: 4
                                  }
                                }
                              • id: null
                              • expression: false
                              • generator: false
                              • async: true
                              • params: []
                              • body: BlockStatement {...}
                                • type: "BlockStatement"
                                • start: 180
                                • end: 217
                                • loc: {...}
                                  • start: {...}
                                    • line: 9
                                    • column: 21
                                    }
                                  • end: {...}
                                    • line: 12
                                    • column: 4
                                    }
                                  }
                                • body: [...] (2)
                                  • ExpressionStatement {...}
                                    • type: "ExpressionStatement"
                                    • start: 186
                                    • end: 194
                                    • loc: {...}
                                      • start: {...}
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                                        • column: 4
                                        }
                                      • end: {...}
                                        • line: 10
                                        • column: 12
                                        }
                                      }
                                    • expression: UpdateExpression {...}
                                      • type: "UpdateExpression"
                                      • start: 186
                                      • end: 193
                                      • loc: {...}
                                        • start: {...}
                                          • line: 10
                                          • column: 4
                                          }
                                        • end: {...}
                                          • line: 10
                                          • column: 11
                                          }
                                        }
                                      • operator: "++"
                                      • prefix: false
                                      • argument: Identifier {...}
                                        • type: "Identifier"
                                        • start: 186
                                        • end: 191
                                        • loc: {...}
                                          • start: {...}
                                            • line: 10
                                            • column: 4
                                            }
                                          • end: {...}
                                            • line: 10
                                            • column: 9
                                            }
                                          }
                                        • name: "count"
                                        }
                                      }
                                    }
                                  • ExpressionStatement {...}
                                    • type: "ExpressionStatement"
                                    • start: 199
                                    • end: 212
                                    • loc: {...}
                                      • start: {...}
                                        • line: 11
                                        • column: 4
                                        }
                                      • end: {...}
                                        • line: 11
                                        • column: 17
                                        }
                                      }
                                    • expression: AwaitExpression {...}
                                      • type: "AwaitExpression"
                                      • start: 199
                                      • end: 211
                                      • loc: {...}
                                        • start: {...}
                                          • line: 11
                                          • column: 4
                                          }
                                        • end: {...}
                                          • line: 11
                                          • column: 16
                                          }
                                        }
                                      • argument: CallExpression {...}
                                        • type: "CallExpression"
                                        • start: 205
                                        • end: 211
                                        • loc: {...}
                                          • start: {...}
                                            • line: 11
                                            • column: 10
                                            }
                                          • end: {...}
                                            • line: 11
                                            • column: 16
                                            }
                                          }
                                        • callee: Identifier {...}
                                          • type: "Identifier"
                                          • start: 205
                                          • end: 209
                                          • loc: {...}
                                            • start: {...}
                                              • line: 11
                                              • column: 10
                                              }
                                            • end: {...}
                                              • line: 11
                                              • column: 14
                                              }
                                            }
                                          • name: "tick"
                                          }
                                        • arguments: []
                                        • optional: false
                                        }
                                      }
                                    }
                                  ]
                                }
                              }
                            }
                          ]
                        }
                      ]
                    • optional: false
                    }
                  }
                ]
              }
            }
          ]
        • sourceType: "module"
        }
      • attributes: []
      }
    }
The AST is not public API and may change at any point in time
Hello world • Playground • Svelte