Stryker Error: 'svelte/compiler' no longer exports a walk utility in svelte version 5+

[jacq42]

Summary

The svelte-parser.ts imports the (deprecated) walk function from svelte compiler:

const { parse: svelteParse, walk, preprocess, VERSION } = await import('svelte/compiler');

When running stryker mutation tests after updating, I got the error message:

 ERROR Stryker Unexpected error occurred while running Stryker Error: 'svelte/compiler' no longer exports a `walk` utility — please import it directly from 'estree-walker' instead
    at walk (file:///xxx/node_modules/svelte/src/compiler/index.js:163:8)
    at getTemplateScriptRanges (file:///xxx/node_modules/@stryker-mutator/instrumenter/dist/src/parsers/svelte-parser.js:51:9)
    at parse (file:///xxx/node_modules/@stryker-mutator/instrumenter/dist/src/parsers/svelte-parser.js:16:28)
    at async Instrumenter.instrument (file:///xxx/node_modules/@stryker-mutator/instrumenter/dist/src/instrumenter.js:33:25)
    at async MutantInstrumenterExecutor.execute (file:///xxx/node_modules/@stryker-mutator/core/dist/src/process/2-mutant-instrumenter-executor.js:26:34)
    at async Stryker.runMutationTest (file:///xxx/node_modules/@stryker-mutator/core/dist/src/stryker.js:33:48)

Stryker/Svelte/Test environment

+-- @stryker-mutator/[email protected]

+-- [email protected]
+-- [email protected]

Your Environment

software	version(s)
node	22.12.0
npm	10.9.0
Operating System	Mac Darwin 24.3.0

[jacq42]

Any updates for this bug?

How to use stryker.js with svelte 5?

[david-otten]

@simondel @nicojs

Do you have an eye on this? Is there a plan to migrate to svelte5?

[jacq42]

The update to Svelte v5 is included in this PR. But no one is assigned.

[Andreas02-dev]

@david-otten @jacq42

We're currently working on it, and expect to release Svelte 5 support soon!

[Andreas02-dev]

@jacq42 @david-otten

Thank you for your patience!
We have now released version 9.0.1 of StrykerJS which includes Svelte 5 support, so I will be closing this issue.