fix: update Readme e2e setup to require build:example

[KapilSachdev]

E2E Build Prerequisite Clarification

Following Readme instructions for e2e fails with error You need to run node tool/build-example.js before run this test.

Problem

echarts-examples README instructs users to run:

npm run build:examplelist

so that e2e tests can execute without issues using

npm run test:e2e:esbuild:local

However, build:examplelist invokes tool/build-example.js --no-thumb, which skips the Puppeteer-driven screenshot flow.

That also means the option JSON files under public/data/option/*.json are not generated, which invokes below code:

echarts-examples/e2e/main.js

Lines 280 to 290 in 37bf026

	async function buildRunCode() {
	const files = await globby([
	`${PUBLIC_DIR}/data/option/*.json`,
	`${PUBLIC_DIR}/data-gl/option/*.json`
	]);
	if (!files.length) {
	throw new Error(
	'You need to run `node tool/build-example.js` before run this test.'
	);
	}

Solution

• Update the README for proper e2e setup requiring npm run build:example