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visitNodesWithoutCopyingPositions always makes a new NodeArray #59137

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merged 2 commits into from
Jul 16, 2024
Merged

visitNodesWithoutCopyingPositions always makes a new NodeArray #59137

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2761af7
fix checker call
iisaduan Jul 3, 2024
9aeb8a3
change to slice for perf test
iisaduan Jul 5, 2024
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fix checker call
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@iisaduan
iisaduan committed Jul 3, 2024
commit 2761af77709cdd9703080781c2beca254b7db129
2 changes: 1 addition & 1 deletion src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -8980,7 +8980,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
if (result) {
if (result.pos !== -1 || result.end !== -1) {
if (result === nodes) {
result = factory.createNodeArray(nodes, nodes.hasTrailingComma);
result = factory.createNodeArray([...nodes], nodes.hasTrailingComma);
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I believe slice() tends to be a little faster than spreading since engines have to do shenanigans to support non-array iterables.

Suggested change
result = factory.createNodeArray([...nodes], nodes.hasTrailingComma);
result = factory.createNodeArray(nodes.slice(), nodes.hasTrailingComma);

}
setTextRangePosEnd(result, -1, -1);
}
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38 changes: 38 additions & 0 deletions tests/cases/fourslash/nodeArrayCloneCrash.ts
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@@ -0,0 +1,38 @@
/// <reference path="fourslash.ts" />

// @module: preserve

// @Filename: /TLLineShape.ts
//// import { createShapePropsMigrationIds } from "./TLShape";
//// createShapePropsMigrationIds/**/

// @Filename: /TLShape.ts
//// import { T } from "@tldraw/validate";
////
//// /**
//// * @public
//// */
//// export function createShapePropsMigrationIds<T>(): { [k in keyof T]: any } {
//// return;
//// }

verify.completions({
marker: "",
includes: [
{
name: "createShapePropsMigrationIds",
text: "(alias) function createShapePropsMigrationIds<T>(): { [k in keyof T]: any; }\nimport createShapePropsMigrationIds",
tags: [{ name: "public", text: undefined }]
}
]
});

goTo.file("/TLShape.ts");
verify.organizeImports(
`
/**
* @public
*/
export function createShapePropsMigrationIds<T>(): { [k in keyof T]: any } {
return;
}`);