[Feature] API for changing localStorage

I’m trying to get the localStorage of an app via:

const storage = await context.storageState(); and it outputs: { cookies: [], origins: [] }

and then I try:

    const localStorage = await page.evaluate(() =>
      JSON.stringify(window.localStorage)
    );
    console.log(localStorage);

and I get: page.evaluate: Evaluation failed: DOMException: Failed to read the 'localStorage' property from 'Window': Access is denied for this document.

I know this page has localStorage because In between tests, I can see the localStorage in the Application tab.

[b5414]

for someone

await page.addInitScript(()=>{
	window.localStorage.setItem('key', 'value');
});

[dgozman]

@dcerniglia Look into page.addInitScript():

beforeEach(async ({ page }) => {
  // ...
  await page.addInitScript(value => {
    window.localStorage.setItem('debug', value);
  }, testConfigJson);
});